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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 1/65APC200 ECM/ECI
Transmission
Control System
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 2/65Contents
1. Functional specification ___________________________________________________ 5
1.1 General ________________________________________________________________________ 5 1.2 External interfaces_______________________________________________________________ 6 1.3 Man Machine interface ___________________________________________________________ 91.3.1 Shift lever _________________________________________________________________________ 9 1.3.2 Display ___________________________________________________________________________ 9 1.3.3 Other ____________________________________________________________________________ 10 1.4 Operating modes _______________________________________________________________ 11
1.4.1 Normal driving ____________________________________________________________________ 11 1.4.2 Self test mode _____________________________________________________________________ 11 1.4.3 Limp Home mode __________________________________________________________________ 11 1.4.4 Shutdown mode ___________________________________________________________________ 11 1.4.5 Mode identification_________________________________________________________________ 12 1.5 Operating Characteristics________________________________________________________ 12 1.5.1 System___________________________________________________________________________ 12 1.5.2 On/Off inputs _____________________________________________________________________ 13 1.5.3 Analogue inputs ___________________________________________________________________ 13 1.5.4 Speed sensor inputs_________________________________________________________________ 13 1.5.5 On/Off outputs ____________________________________________________________________ 14 1.5.6 Analogue outputs __________________________________________________________________ 14 1.5.7 Speedometer output (combined with RS232 transmit) ______________________________________ 14 1.5.8 Communication interfaces ___________________________________________________________ 14 1.6 Functional description of an automatic control on a forklift ___________________________ 15
1.6.1 External inputs ____________________________________________________________________ 15 1.6.2 General __________________________________________________________________________ 17 1.6.3 Transmission gear changing. _________________________________________________________ 17 1.6.4 Direction reversal protections _________________________________________________________ 19 1.6.5 Behaviour in neutral ________________________________________________________________ 20 1.6.6 Output functions. __________________________________________________________________ 20 1.7 The APC200 Inching System _____________________________________________________ 21
1.7.1 Operation ________________________________________________________________________ 21 1.7.2 Activation of the inching system ______________________________________________________ 21 1.7.3 Leaving Inching mode ______________________________________________________________ 22 1.7.4 Protections preventing Inching mode ___________________________________________________ 22 1.7.5 Function of the brake pedal in relation with inching _______________________________________ 22 1.7.6 Function of the brake pedal without inching _____________________________________________ 23 1.7.7 Tips for effectively using the inching system _____________________________________________ 23 1.8 The APC200 Hydrostatic simulation system_________________________________________ 24
2.
Safety related requirements __________________________________________________ 25
2.1 Applicable safety guidelines ______________________________________________________ 25 2.2 Safety concept _________________________________________________________________ 252.2.1 General __________________________________________________________________________ 25 2.2.2 ECM/APC200 implementation ________________________________________________________ 26 2.3 Considered faults _______________________________________________________________ 26
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 3/652.4 Behaviour in case of faults _______________________________________________________ 27 2.4.1 General __________________________________________________________________________ 27 2.4.2 Reset Condition ___________________________________________________________________ 27 2.4.3 Over voltage ______________________________________________________________________ 27 2.4.4 Under voltage _____________________________________________________________________ 27 2.4.5 Internal faults _____________________________________________________________________ 27 2.4.6 Redundant Shutdown Path Error ______________________________________________________ 28 2.4.7 Program out of control ______________________________________________________________ 29 2.4.8 Intermittent power loss ______________________________________________________________ 29 2.4.9 Single faults on analogue outputs ______________________________________________________ 29 2.4.10 Single faults on on/off outputs ________________________________________________________ 31 2.4.11 Incorrect input patterns ______________________________________________________________ 32 2.4.12 Speed sensor faults _________________________________________________________________ 32 2.4.13 Analogue sensor failure _____________________________________________________________ 33 2.4.14 Transmission ratio faults_____________________________________________________________ 34 2.4.15 Converter Temperature problem_______________________________________________________ 34 2.4.16 Service requests ___________________________________________________________________ 35 2.4.17 Indication of faults _________________________________________________________________ 35 2.4.18 Indication of faults that have previously occurred _________________________________________ 38 2.5 Behaviour when faults are removed _______________________________________________ 38
2.5.1 Over voltage ______________________________________________________________________ 38 2.5.2 Under voltage _____________________________________________________________________ 38 2.5.3 Internal faults _____________________________________________________________________ 38 2.5.4 Redundant Shutdown Path Error ______________________________________________________ 39 2.5.5 Program out of control ______________________________________________________________ 39 2.5.6 Intermittent power loss ______________________________________________________________ 39 2.5.7 Single faults on outputs _____________________________________________________________ 39 2.5.8 Multiple faults on outputs ____________________________________________________________ 39 2.5.9 Incorrect input patterns ______________________________________________________________ 39 2.5.10 Speed sensor failure ________________________________________________________________ 39 2.5.11 Analogue sensor failure _____________________________________________________________ 39 2.6 Specific measures to guarantee Fault tolerance ______________________________________ 39 2.7 Organisational measures to protect from external factors _____________________________ 40
2.7.1 Identification______________________________________________________________________ 40 2.7.2 Traceability and configuration control __________________________________________________ 40 2.7.3 Sourcing _________________________________________________________________________ 41 2.7.4 Software _________________________________________________________________________ 41
3. Environmental
conditions____________________________________________________ 41
3.1 Nature of environmental conditions _______________________________________________ 41 3.2 Behaviour of the system under certain conditions ____________________________________ 41 3.3 Environmental standards and limits _______________________________________________ 42 3.4 Interference immunity standards and limits_________________________________________ 42
4.
Design and development tools ________________________________________________ 42
5.
Diagnostics and Guidelines __________________________________________________ 44
5.1 Diagnostics and maintenance _____________________________________________________ 445.1.1 General __________________________________________________________________________ 44 5.1.2 Self test Functions__________________________________________________________________ 44
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 4/655.2 Technical guidelines for installation _______________________________________________ 50 5.2.1 Power supply _____________________________________________________________________ 51 5.2.2 Input signals ______________________________________________________________________ 52 5.2.3 Output signals _____________________________________________________________________ 53 5.2.4 Communication interfaces ___________________________________________________________ 54 5.3 Control system calibration _______________________________________________________ 56 5.3.1 Calibration of the accelerator pedal sensor _______________________________________________ 57 5.3.2 Calibration of the brake pedal sensor ___________________________________________________ 58 5.3.3 Calibration of the hydro lever sensor ___________________________________________________ 59 5.3.4 Calibration of the servo motor sensor___________________________________________________ 60 5.3.5 Calibration of clutch control parameters_________________________________________________ 61
6. Statistics __________________________________________________________________ 63
7. Revision
record ____________________________________________________________ 64
8. Configuration
Record _______________________________________________________ 64
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 5/65APC200 for ECM / ECI
1. Functional specification
1.1 General
The APC200 (Transmission Controller for ECM) is a device used to control the shifting of the Spicer Off Highway Products ECM powershift transmissions.
ECM means Electronic Controlled Modulation and refers to a transmission control technology that is available on a range of transmission models.
ECI means Electronic Controlled Inching. This refers to the capability of ECM transmissions with APC200 to run at very low controlled speed at virtually any engine speed. This function is desirable in a/o. forklift truck applications.
To date, within these models, three transmission types are supported: TE13, TE17 and TE32 transmissions with 4/4, 4/3 and 3/3 gear sets.
Control Valve Transmission
APC200
Shift Lever Throttle Pedal Brake Pedal Mode Selection CAN GND POWER+
Engine Speed Turbine Speed Drum Speed Output Speed Temperature Throttle Servo Control EngineSPICER OFF-HIGHWAY
APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 6/65The APC200 takes care of all transmission related functions in order to achieve superior shift quality and high reliability. Additionally it can control the engine speed either through use of a suitable servo motor on the injection pump or via the standardized SAE J1939 CAN protocol.. The built in self-test and trouble shooting features allow fast problem resolution.
The integration in the vehicle wiring system is straightforward and mainly involves connections between the APC200, the shift selector, the speed sensors, and the transmission control valve.
FB DIG OUT DIG INP SPEED INP I/V STAT
ANA INP ANA I/O
M S FB Red.ShutDown FB PWM I+
I-Additionally the APC200 requires some connections for supplying power and for selection of different operating modes. For more detail, check the application specific wiring diagrams. Refer to section 5.2 for details about the installation.
1.2 External interfaces
The APC200 is connected to the vehicle wiring system using a 48 pole Packard Metripack Connector.
The two mating connectors (18 pole and 30 pole) have following components and Packard part numbers.
Part Packard Part number Receptacle 30 pin 1203 4398
Receptacle 18 pin 1204 0921
Contact 12089290 (0.35-0.5 mm²) 12103881 (0.8 - 1.0 mm²)
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 7/65The different connector pin functions for the APC200 are listed below.
Following type designations are considered:
Ptg pull to ground Input internally pulled high, must be connected to Ground to activate. Alternately senses resistance 0 - 5 kOhm Ptp pull to plus input internally pulled low, must be connected to Plus to
activate
Stg switch to ground Output switches internally to Ground. Other side of Load must be connected with Plus
Stp switch to plus Output switches internally to Battery plus. Other side of Load must be connected with Ground
Pwr power supply line connected to battery Gnd ground ground reference line or supply line
Sns sense sensor input for frequency, voltage or current Pwm pulse width
modulated
Output uses PWM to control the output current. When combined with the proper sns input, closed loop current control is possible.
Comm communication control line used for communicating information with other controllers and / or PC’s
Hbrg bi-directional motor control
Output can control the speed of a DC motor in both directions
In below table all references to terminals have prefix TC meaning they refer to the APC200 connector pins
WIRE PIN FUNC TYPE DESCRIPTION 4/3 SPEED DESCRIPTION 3/3 & 4/4 SPEED
A01 01 A1 PPWR Pwr Permanent Battery Plus Permanent Battery Plus A02 02 B1 VFS0+ Pwm Fwd VFS Hi Side Out Fwd VFS Hi Side Out
A03 03 C1 VFS0- Sns Fwd VFS Lo Side In Fwd VFS Lo Side In
A04 04 D1 VFS1+ Pwm Rev/Hi VFS Hi Side Out 2nd/4th VFS Hi Side Out
A05 05 E1 VFS1- Sns Rev/Hi VFS Lo Side In 2nd/4th VFS Lo Side In
A06 06 F1 VFS2+ Pwm 2nd VFS Hi Side Out Rev VFS Hi Side Out
A07 07 G1 VFS2- Sns 2nd VFS Lo Side In Rev VFS Lo Side In
A08 08 H1 VFS3+ Pwm 1th/3th VFS Hi Side Out 1th/3th VFS Hi Side Out
A09 09 J1 VFS3- Sns 1th/3th VFS Lo Side In 1th/3th VFS Lo Side In
A10 10 K1 DO0 Stp RSP Drive Solenoid + RSP Drive Solenoid +
A11 11 A2 ANI0 Ptg Pressure feedback Pressure feedback
A12 12 B2 DIGIN0 Ptp Shiftlever 1-2 Shiftlever 1-2
A13 13 C2 DIGIN1 Ptp Shiftlever 2-3 Shiftlever 2-3
A14 14 D2 DIGIN2 Ptp Free Shiftlever input Shiftlever 3-4
A15 15 E2 DO1 Stp Alarm output (option) 2/4 VFS selector
A16 16 F2 DO2 Stp 1/3 VFS selector 1/3 VFS selector
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 8/65WIRE PIN FUNC TYPE DESCRIPTION 4/3 SPEED DESCRIPTION 3/3 & 4/4 SPEED
A18 18 H2 DIGIN4 Ptp Shiftlever FWD Shiftlever FWD
A19 19 J2 DIGIN5 Ptp Shiftlever REV Shiftlever REV
A20 20 K2 DO3 Stg RSP Drive Solenoid - RSP Drive Solenoid -
A21 21 A3 GND Gnd Supply Ground Supply Ground
A22 22 B3 SS0 Sns Drum speed sensor+ Drum speed sensor+
A23 23 C3 SS0 Gnd Drum speed sensor - Drum speed sensor -
A24 24 D3 SS1 Sns Output speed sensor+ Output speed sensor+
A25 25 E3 SS1 Gnd Output speed sensor - Output speed sensor -
A26 26 F3 SS2 Sns Engine speed sensor+ Engine speed sensor+
A27 27 G3 SS2 Gnd Engine speed sensor - Engine speed sensor -
A28 28 H3 ANI1 Ptg TransmTemperature TransmTemperature
A29 29 J3 ANI2 Ptg Cooler input temperature Cooler input temperature
A30 30 K3 SGND Gnd Signal Ground Signal Ground
WIRE PIN FUNC TYPE DESCRIPTION 4/3 SPEED DESCRIPTION 3/3 & 4/4 SPEED
B01 31 L1 VFS4+ HbrgA Engine control motor A Engine control motor A B02 32 M1 ANI4 Sns 5V Reference voltage out 5V Reference voltage out B03 33 N1 VFS5+ HbrgB Engine servol motor B Engine servo motor B B04 34 P1 ANI5 Sns Engine servo pos. input 0-5V Engine servo pos. input 0-5V B05 35 R1 VFS6+ Pwm Ana.brake valve Analog brake valve
B06 36 S1 ANI6 Sns Accelerator pedal analog input 0-5V
Accelerator pedal analog input 0-5V
B07 37 L2 CANL Comm CAN Lo CAN Lo
B08 38 M2 CANH Comm CAN Hi CAN Hi
B09 39 N2 RXD Comm RS232 RXD RS232 RXD
B10 40 P2 TXD Comm RS232 TXD / SPEEDO OUT RS232 TXD / SPEEDO OUT B11 41 R2 SS3 Sns Turbine speed sensor+ Turbine speed sensor+ B12 42 S2 SPWR Pwr Switched Battery Plus Switched Battery Plus B13 43 L3 DIGIN6 Ptp Inching Enable switch Inching Enable switch B14 44 M3 DIGIN7 Ptp manual / automatic selection manual / automatic selection B15 45 N3 DIGIN8 Ptp Parking Brake OFF/ON Parking Brake OFF/ON B16 46 P3 DIGIN9 Ptp
B17 47 R3 ANI3 Ptg Brake pedal analog input 0-5V Brake pedal analog input 0-5V
B18 48 S3 GND Gnd VFS Ground VFS Ground
Note that different configurations are supported. The Input / Output mix can be varied through the use of parameter sets which determine the exact I/O allocation. Further, most non-transmission related functions can be routed through the CAN bus instead.
Connector layout :
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 9/651.3 Man Machine interface
1.3.1 Shift lever
The main interface with the driver is the shift lever. It allows selecting the driving direction and the different ranges. The shift lever output signals serve as inputs for the
APC200
.The
APC200
is designed to interface with a variety of shift levers. Refer to the application specific wiring diagram for detailed information about shift patterns.Note that the APC200 supports remote control via the CAN bus as documented in the CAN EDI.
1.3.2 Display
The display is located on the APC200 front panel and consists of:
• 4 red 7-segment LED digits • 3 status LED lamps
("D","E","F")
• 2 push buttons 'M' and 'S' for display mode selection.
APC200 front panel display
The LED lamp labelled 'D' is yellow and is used to indicate test modes. The LED lamp labelled 'E' is yellow and is used to indicate faults.
The LED lamp labelled 'F' is red and is switched on when the APC200 is in the reset condition. Refer to SOHPD drawing IAPC200A for installation dimensions.
After power up, the display defaults to the last display mode selected when the controller was last powered down.
Typically, this will be the gear position mode. In this mode, the centre left digit shows the actually engaged direction and the centre right digit shows the currently engaged range (gear).
Pressing the 'M' switch changes the displayed information group, while pressing the 'S' button selects the item within the group.
While pushing the switch (and about 0.5 seconds after it is released) the display shows which information is about to be displayed.
There are 3 display groups : the most commonly used one allows to switch between gear display and vehicle speed display.
APC200 SPICER OFF-HIGHWAY
E
D
F
M
S
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 10/65The second group shows the shift lever position and some other less used but nevertheless quite relevant values (see list below).
The third display accessed with the M-button isn’t actually a group of screens but is used to inform you about any current or previously active faults. The display normally shows ‘ — — ‘ to indicate there are no faults, but if one or more faults are (or have been) detected, themost severe one is shown until you press the ‘S’ - button. Doing so reveils the next fault until no more faults are present, at which time again the ‘ — — ‘ sign is shown.
Display mode Comment
GPOS Reflects the actually engaged transmission direction and range.
VSPD
Shows vehicle speed in km/h or MPH (parameter setting). Speeds are shown with a 0.1km/h or 0.1 MPH resolution.
DIST
Shows the distance travelled in km or in miles (parameter setting). Distance is shown with a 0.1 km or 0.1 mile resolution. To reset this display, the “S” – button has to be pressed and keep it pressed during 3 seconds, when this display is selected.
CPOS Reflects the current shift lever direction and position.
TSPD Shows measured turbine speed (RPM)
ESPD Shows measured engine speed (RPM)
OSPD Shows measured output speed (RPM)
SRAT
Reflects the current speed ratio (calculated as TSPD/ESPD [turbine speed / engine speed]) and is an important factor in automatic shifting.
TQ I Measured torque at transmission input side (Nm)
TTMP CTMP
Shows transmission temperature in °C or °F (parameter setting) Shows cooler input temperature in °C or °F (parameter setting)
ERR The fault display
When the controller detects an error, the 'E' led blinks slowly to indicate this. You can always select the fault display mode (ERR) to view the nature of the problem. Error codes are described in section 2.4 Behaviour in case of faults.
1.3.3 Other
Additionally several on/off switches and position sensors with function described in section 1.6.1 can be used to control the different operating functions. The control system can receive state information of these inputs either directly through its own inputs or via the CAN-bus using standardised messages.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 11/651.4 Operating modes
1.4.1 Normal driving
See 1.6 for detailed description.
1.4.2 Self test mode
This mode is selected when the ‘S’ mode switch is pressed at power up. See 5.1.2 Self test Functions for detailed description.
1.4.3 Limp Home mode
Defaulted to if either of following conditions occurs:
• a single fault on a transmission control output is detected • a fault related to the engine speed sensor is detected • two out of three vehicle speed sensors are in fault
If one of the above conditions is present, the transmission is put in neutral. In order to continue driving, neutral must first be selected on the shift lever. Once the shift lever has been put in neutral, the driver can re-engage a direction. In this mode, the user can operate the transmission in either direction in 1st and 2nd only. If the fault occurs at a higher gear position, the user is allowed to shift down manually.
Note: On some transmissions, ratios normally not selectable are used to substitute those that can no longer be selected.
The controller uses default limits; all shifts use a default modulation curve. Inching is disabled.
The GPOS / CPOS display indicates the letters ‘LH’ left of the direction/position indication.
1.4.4 Shutdown mode
The ECM transmission control valve has a built-in redundant shutdown solenoid and a pressure switch that monitors the pressure controlled by that solenoid.
This solenoid is controlled by the APC200 using both a high side and a low side switch (again redundant logic).
When the APC200 enters shut down mode, all four pressure modulators are put at zero pressure AND both controlling outputs of the redundant shutdown solenoid are switched off. This mode is activated when a severe internal or external problem is detected.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 12/65In this mode, the transmission is forced in Neutral because the redundant shutdown path cuts off the hydraulic power to the clutches.
This mode is selected only if an intolerable combination of faults exists. In case of an intermitting problem, SHUTDOWN mode is exited and the controller enters the LIMP HOME mode.
However, in case the error is related to the pressure feedback signal, SHUTDOWN mode remains selected until the controller is switched off.
Also when a fault related to the parameter settings located n FLASH memory s detected, the controller reverts to shutdown mode
The GPOS / CPOS display indicates the letters ‘Sd’ left of the direction/position indication.
1.4.5 Mode identification
Above modes are identified as follows:
Mode D-led E-led Display
Normal driving Off as per error
Self test On Off described in 5.1
Diagnostics and maintenance Limp home Off Blinking
Shut Down Off Blinking
1.5 Operating Characteristics
The APC200 is designed to operate continuously under the environmental conditions described in section 3.3.
Below sections detail some specific system limits and specification data relevant for interfacing with the APC200-24.
1.5.1 System
Operating temperature range -40°C to +80°C
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 13/65Supply Voltage nominal min - max.
24V
18V – 30Vdc Over voltage conditions 5 min @ 48V
500ms @ 220V 2 ms @ 300V Maximum continuous total
load current @ 24V
12 Amperes
1.5.2 On/Off inputs
Low input level < 0.8 V High input level > 2.3V Minimum DC voltage level - 60V Maximum DC voltage level +60V
1.5.3 Analogue inputs
Internal pull up resistor (8V) 3 kOhm Input voltage range 0 to 5 V
Resolution 10 bit Minimum DC voltage level - 60V
Maximum DC voltage level +60V
1.5.4 Speed sensor inputs
In order to accurately control ECM, the APC200 has 4 speed sensor input circuits. All sensor circuits can be programmed to act as a MRS circuit (this is a current loop circuit compatible with the SOH Magneto Resistive Sensor) or as an inductive circuit.
Which circuit configuration is selected, depends on the sensor provisions on the transmission.
1.5.4.1 Sensor circuit characteristics
Sensor type Inductive Magneto resistive Electrical interface Unbalanced Current sensing Normal operating current N/A 7 / 14 mA Short circuit detect yes yes Open circuit detect yes yes
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 14/65Reverse polarity detect N/A seen as short circuit
Fully protected yes yes
1.5.5 On/Off outputs
Maximum continuous load current
1.5 Amperes Short circuit detect yes
Open circuit detect yes Redundant shutdown path
common for 3 outputs
yes Fully protected yes
1.5.6 Analogue outputs
Output current 0mA - 1200mA
Resolution 10 bit Short circuit detect yes
Open circuit detect yes Redundant shutdown paths
common for 4 and 3 outputs
yes Fully protected yes
1.5.7 Speedometer output (combined with RS232 transmit)
Signal amplitude -8V / +8V
External load > 1kOhm Conversion factor
(programmable)
3.0 to 200 Hz/kph Output frequency range 0 - 20000 Hz Short Circuit protected Yes
1.5.8 Communication interfaces
RS232
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 15/65Protocol 8 bit 1 stop bit no parity Handshake Xon/xoff SOH protocol CAN Bitrate Programmable up to 1MBPS
physical layer ISO 11898 CAN compatibility REV2.0B
SAE/J1939 yes ( @ 250 kbps) Termination external 120 Ohm
1.6 Functional description of an automatic control on a forklift
1.6.1 External inputs
Please refer to the proper electrical wiring diagram for connections and logic of the inputs discussed below.
1.6.1.1 Shift lever
The main interface with the driver is the shift lever. It allows selecting the driving direction and the different ranges. The shift lever output signals serve as inputs for the APC200.
The APC200 can be programmed to interact with a large number of shift levers. Models supported:
• Bump type shift lever: this type of shift lever generates pulse signals for up-and downshifting, while providing fixed signals for the direction (forward and reverse).
• Standard type shift lever: this type of shift lever generates a distinct pattern in each position. The APC200 can be programmed to accommodate any such shift lever, provided it does not use more than 6 wires to determine its position.
• Remote control through the CAN EDI specification.
Check the wiring diagram for correctly connecting the shift lever to the APC200.
1.6.1.2 Accelerator pedal position sensor
The accelerator pedal should be equipped with an analogue position pickup which translates the position of the accelerator pedal into a variable voltage that can be measured by the APC200 on one of its analogue inputs.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 16/65The APC200 uses this information to determine the driver’s intentions and to derive which shift characteristics to use.
Optionally the APC200 uses it to control the engine accelerator using a suitable servo motor.
The accelerator pedal position is converted into a reading from 0% to 100%. Some configurations transmit the accelerator pedal position via CAN.
1.6.1.3 Brake pedal position sensor
The brake pedal should be equipped with an analogue position pickup that translates the position of the brake pedal into a variable voltage that can be measured by the APC200 on one of its analogue inputs.
The brake pedal position is used only while operating in inching mode. It is not used in the hydrostatic drive simulation mode.
1.6.1.4 Manual / automatic switch
1.6.1.4.1 Manual ÖAutomaticSwitching from manual to automatic is possible in all circumstances. 1.6.1.4.2 Automatic ÖManual
Switching from automatic to manual is deferred until following conditions are fulfilled : • Vehicle speed is sufficiently low
• Shift lever position equals or exceeds the transmission gear position.
1.6.1.5 Inching enable switch
This on/off switch should be mounted on the left brake pedal in such way that the driver can easily use the brakes with or without depressing it.
If the switch is activated while braking, the inching function gets activated. It is not used in the hydrostatic drive simulation mode.
1.6.1.6 Start in 1
st/ 2
ndgear switch
This on/off switch will inform the controller to start in 1st or in 2nd gear.
If start in 2nd gear is selected, 1st gear will be reached via an automatic downshift, when the machine experiences high load and needs a high tractive effort to accelerate (Automatic kickdown). Once 1st gear is reached, a direction change will result in starting in 2nd gear.
1.6.1.7 Reduce vehicle speed switch
This on/off switch will inform the controller to reduce the vehicle speed by controlling the engine speed. The reduced speed is either specified in the GDE parameter or using the CAN EDI protocol (see APC200 CAN EDI Description).
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 17/65REMARK: When this reduced vehicle speed limit is activated, it overrules any other setting of the engine speed. This can result in lowering the engine throttle, even if a high engine speed would be desired, for instance when using the inching function.
1.6.2 General
The APC200 takes care of the following functions • direction change protection
• overspeeding control • automatic shifting • inching
• declutch
• engine control (certain configurations) • service brakes (certain configurations)
1.6.3 Transmission gear changing.
Please note that all limit values mentioned in this document are values for reference only, which can be changed while fine-tuning the application. They serve to indicate the typical order of magnitude these limits usually have, allowing understanding their intended function.
1.6.3.1 Standard drive
Used when the accelerator pedal > 20% and when the speed ratio < 1.0
1
<
speed
engine
speed
turbine
=
ratio
speed
Automatic upshiftingAn automatic shift to a higher gear is made when the accelerator pedal is pressed, the turbine speed exceeds a minimum speed, and the slip in the converter (speed ratio) has reached a certain value. This occurs when the tractive effort in the higher gear is higher than the tractive effort in the lower gear. The below table indicates for each gear the different limits.
Minimum turbine speed for automatic upshifting :
Shift ACCELERATOR > 20% ACCELERATOR > 80%
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 18/65Shift ACCELERATOR > 20% ACCELERATOR > 80%
F2-F3 1450 1700
A typical upshiftcurve (speed ratio as function of turbine speed) :
Shift 2-3 0.75 0.76 0.77 0.78 0.79 0.8 0.81 0.82 0.83 0.84 0.85 0.86 1000 1200 1400 1600 1800 2000 2200 Turbine RPM SR Automatic downshifting
An automatic shift to a lower gear is made when the tractive effort in the lower gear exceeds the tractive effort in the higher gear (i.e. when the speedratio drops below a ceratin limit)
Below, a typical downshift curve is shown (speed ratio as function of turbine speed).
Shift 3-2 0.3 0.32 0.34 0.36 0.38 0.4 0.42 400 500 600 700 800 900 1000 Turbine RPM SR
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 19/651.6.3.2 Braking mode
Used when the accelerator < 20% and when the speed ratio >= 1. On the vehicle, it means that the driver has released the accelerator pedal.
speed ratio =
turbine speed
engine speed
> 1
Automatic upshift
In principle no automatic up-shifts occur in braking mode. The only exception is when the transmission overspeeding limit (depends on transmission model) is reached and the shift lever indicates a higher range than the one selected on the transmission.
Automatic downshift
Downshifts occur based on vehicle speed.
1.6.4 Direction reversal protections
1.6.4.1 Forward
Æ Reverse or visa versa
The behaviour of the transmission largely depends on the vehicle speed when the direction change is made.
If the vehicle speed is too high (3 km/h typically), the direction change will be postponed and neutral is selected. A warning lamp (if installed) is switched on.
If the engine speed is below the limit for direction changes, and the vehicle speed is sufficiently low, the direction change is made immediately without changing the transmission gear.
If the engine speed however exceeds the engine limit, the transmission will remain in neutral, and the warning lamp will be switched on until the limit is satisfied.
The engine speed limit is typically disabled but can be activated on request.
When hydrostatic drive simulation mode is selected, the service brakes are used to automatically decelerate the vehicle below the reversal limit and the engine is forced to idle during that time.
1.6.4.2 Neutral
Æ Forward or Reverse (after standstill)
If an engine speed limit is used, neither forward nor reverse can be selected when the engine speed is too high.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 20/651.6.4.3 Forward
Æ Neutral Æ Forward
When driving in a certain direction and when putting the gear selector in neutral and back in the same direction, the direction will re-engage provided the engine speed has dropped below the limit for direction changes (if used).
1.6.5 Behaviour in neutral
Coasting in neutral on a downhill could cause overspeeding of internal transmission components. In order to protect against this, if the transmission is in neutral, the control unit shifts to the next higher gear when the vehicle speed exceeds 5 kph (1st gear), 10 kph (2nd gear).
A downshift will be made at following typical vehicle speeds: 3kph (2nd gear), 8kph (3rd gear), 14kph (4th gear).
The shift lever position limits the highest position that will be selected – e.g. if placed in 2nd, the controller is not allowed to protect the transmission by shifting to 3rd.
When hydrostatic drive simulation mode is selected, the machine is brought to a stop (active braking) when neutral is selected. When standing still, the brakes are applied to hold the vehicle even on a grade.
1.6.6 Output functions.
1.6.6.1 Transmission control outputs
The transmission is controlled through variable force solenoids (VFS) and clutch selectors. The signals on these outputs are transmission specific and are optimized for each application.
1.6.6.2 Warning lamp
When a direction change or a downshift is made at too high vehicle speed, the warning lamp is switched on and the request is not executed -
In case of an inhibited direction change, the transmission is put in neutral.
In case of an inhibited downshift, the current gear remains engaged. When the vehicle speed has dropped sufficiently, the request is handled and the warning lamp is switched off.
In some configurations, the warning lamp also conveys information about current faults: if a fault is active (i.e. present), the warning lamp is blinking. The driver knows the difference between faults and protections through the fact that the lamp is either blinking or on continuously.
1.6.6.3 Engine control via CAN
In case the engine is equipped with an engine controller capable of communicating via the CAN 2.0B, the APC200 is able to control the engine to further enhance shift quality. In case of automatic shifting, the APC200 may reduce the engine torque to the transmission. Once the shift is over, the engine torque is gradually increased to its normal level.
The APC200 uses the SAE J1939 TSC1 message to control the speed (not the torque) of the engine. The source address is 03 by default and the destination address is 00. The message has a priority of 6 and is transmitted at a bitrate of 250 kbps every 20 ms.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 21/651.6.6.4 Engine control by APC200
The APC200 has a H-bridge output capable of controlling standard (BOSCH) engine control servo motors with position feedback.
This provision can optionally be used to provide ‘throttle by wire’. Several engine control modes are available.
Alternatively, the APC200 can be programmed to send TSC1 messages on the CAN bus to control a SAE J1939 compatible engine.
1.7 The APC200 Inching System
The term ‘inching’ refers to the process of driving a vehicle at low speed while the engine runs at a high speed, independent from the vehicle speed. The target of inching is to temporarily reserve the engine power for controlling the hydraulics while still being able to precisely maneuver the vehicle. The APC200 implements this functionality by slipping the direction clutches, limiting the power that can be absorbed from the engine.
The inching system can be operated both in forward and in reverse and in any range. It will be most effective however in 1st range.
Automatic shift is typically disabled while inching.
1.7.1 Operation
The inching system is controlled with the left brake pedal. The obtained effect depends on how deep you press the brake pedal.
Inch speed as function of brake pedal
position
0.3 8 0 0 2 4 6 8 10 0 25 50 75 100 Brake position (%) Inch speed (kph)The 35% point in above graph is called the MID point and should correspond to the point where the brakes actually start braking.
No Inching Low Speed against brake Speed control De-clutch
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 22/651.7.2 Activation of the inching system
Below conditions must be met simultaneously to start the inching function
In order to activate the inching system, you have to push the left brake pedal beyond 5% you must depress the ‘inching-enable ’ switch (mounted on the left pedal).
A certain minimum engine speed is required to provide the required torque, but apart from that, it doesn’t influence the vehicle speed – so the engine can be at full throttle to speed up the hydraulics or steering (typically no minimum engine speed limit is implemented).
The APC200 will try to match the desired inching speed as close as possible. This speed depends on the current brake pedal position.
While inching, it’s not required to keep the ‘inching enable’ switch pressed.
1.7.3 Leaving Inching mode
If either of below conditions is met, the inching function will be switched off and normal converter operation will be resumed.
Release the brake pedal below 5% ( i.e. release it completely for all practical purposes) Note that releasing the ‘inching enable’ switch will not stop the inching function.
Select Neutral or the other direction.
Note that when changing direction, if the changeover is made while the ‘inching enable’ switch is still pressed, the inching mode will re-activate in the opposite direction.
When the inching torque reaches the allowed maximum for longer than 1 second (parameter) When inching is stopped because of the 1second protection, the direction clutch gradually closes completely and inching is disabled until the brake pedal is completely released (below 5%).
1.7.4 Protections preventing Inching mode
As described above, when you force the inching system to its limits (for instance when trying to inch against the parking brake), it shuts off and the clutch is smoothly pressurized resulting in converter drive. This can result in unwanted acceleration. This protection remains active until the brake pedal is completely released – regardless of whether you change direction
Several system conditions can cause the inching system to become disabled : 1. Speed sensor problem.
2. Brake pedal sensor problem. If the sensor fails while inching, in order to leave inching mode you have to select neutral. After that, inching won’t be activated.
1.7.5 Function of the brake pedal in relation with inching
Brake pedal position effect
0% – 4 % Inching is disabled
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 23/6535% – 69% Fixed inching speed – gradually increasing brake force
70% - 100% Transmission is disconnected – further increasing braking force
In the 5% - 35% brake pedal range, the service brakes don’t actually apply braking force. This range is used to control the vehicle speed throughout the entire 1st gear speed range.
Generally the higher inching speeds are used to smoothly transition from low speed inching into converter drive. Indeed, suddenly releasing the brake pedal causes a noticeable ‘shift’ back into converter drive – comparable to a ‘Neutral – Gear’ shift whereas a gradual release allows a more continuous engagement.
Note that in this range, if the speed is too high, the APC200 – as it doesn’t control the vehicle brakes – can only take away traction. If this is the case, you have to press the brakes more firmly to help the speed reduce.
In the 35% - 70% brake pedal range, the target inching speed is fixed at 0,3 km/h. This range is useful for slowly approaching your target, inching uphill or downhill without excess speed variations. The braking force in this range is sufficient to control the vehicle speed in most conditions.
The 70% - 100% range is used to really make the vehicle decelerate or hold it in standstill condition. In this range, the target speed is 0 km/h – i.e. the transmission is disconnected from the wheels.
1.7.6 Function of the brake pedal without inching
When the (left or right) brake pedal is pressed without pressing the ‘Inch-Enable’ switch, the inching system remains off. This means you just get standard braking.
However once the vehicle speed is below 3 km/h (adjustable) and you press the brake pedal in the 70% - 100% range, the transmission is placed in neutral. This ‘standard’ de-clutch function
improves vehicle braking. Additionally it prevents that you inadvertently overheat the transmission. Releasing the brake pedal below 70% causes the transmission to re-engage smoothly.
1.7.7 Tips for effectively using the inching system
1.7.7.1 Inching in general
If you come to a situation where you want to start inching, press the left brake pedal (including the inching-enable switch) to reduce speed. Brake, as firm as needed - don’t worry about the inching speed. As you get closer to the desired speed gradually release the brake pedal to help the inching system kick in smoothly. This way you prevent that the vehicle comes to a complete stop and that you loose time taking off again.
It takes some experience to get it to work every time, but once you get the hang of it, it feels quite natural.
As soon as you the inching system is enabled, the engine is disconnected and it can accelerate to speed up the hydraulics.
If required while decelerating, the APC200 automatically shifts down sequentially to 1st (note that while inching these shifts can cause a slight shudder).
It’s possible to change direction while inching at full throttle. In other words, if you’re too close to an obstacle, it’s okay to just reverse the direction with the foot on the brake (and on the
‘inching-SPICER OFF-HIGHWAY
APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 24/65enable’ switch) and the engine at full throttle. Make sure to cycle the shift lever quickly to the other direction as otherwise the inching system gets disabled.
When standing still and you want to start while inching, you’d typically press the brake into the de-clutch range (with the ‘inching-enable’ switch pressed !) and slowly release it, holding it halfway until the vehicle starts rolling. Once it’s rolling, further release the brake pedal in order to pick up more speed.
1.7.7.2 Uphill inching
Driving uphill generally takes a lot of power, quite often more than the inching system is allowed to provide.
Nevertheless, there are conditions where inching can be used quite successfully on a slope - for instance on slopes typically used to load trucks and trailers – provided the vehicle is not heavily loaded.
If you have a good ‘run-in’ on the slope, you best start inching before the start of the slope. If you start inching on the slope, depending how you treat the brake pedal, you run the risk of coming to a stop and eventually start rolling backwards. Once you roll backwards the inching system gets confused and won’t help you slow down again.
Note that on most transmissions the APC200 is not capable to sense the actual driving direction, causing it to mistake the rolling backwards for forward movement.
The thing to do in that case is to stop on the hill (and de-clutch) and gently release the brake pedal until you get forward movement again. Careful brake pedal usage usually gets you where you want.
The APC200 has a built-in feature that protects the inching clutches. If you use the inching system in a condition where the required inching torque exceeds a pre-programmed limit, the inching system is disabled and the clutch engages into converter drive.
When this happens (and it will on certain slopes and with certain loads), you will have to reduce the engine speed to control the vehicle speed. This behavior is what you’d want anyway, because the inching system would not be able to provide the power required to get you moving in this condition.
1.7.7.3 Downhill inching
While driving downhill the APC200 has no means to control the vehicle speed. This means you’re on your own as far as inching is concerned. Following remarks may help you make the best of it however.
When inching downhill, the brake pedal will always be in the 35% - 100% range – that is if you want to hold the vehicle at a controlled speed. This means that the target speed is always 0,3 km/h as far as the inching system is concerned.
If you brake to slow down below this speed, you’ll find, the APC200 fights you (it tries to achieve 0,3 km/h). Eventually if you hold the vehicle stopped without going to de-clutch (brake range 35% - 70%) the inching torque eventually will make the vehicle move when it conquers the braking force you apply. This feels awkward and should be prevented.
The best you can do is make sure you keep rolling or if you want to stop, go to de-clutch. On steeper slopes consider going down in converter drive with the engine at idle.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 25/65On systems equipped with a proportional brake valve and a system to control the engine speed (either with a servo motor or through the CAN – bus), the APC200 can simulate the behaviour of a hydrostatic drive system.
1.8.1.1 General
In this mode, you control the vehicle with the accelerator pedal only. The brake pedal is there just in case of emergency.
The APC200 optimizes the use of engine and brakes to get you the speed you want. Indeed, the accelerator pedal is used no longer to control the engine but serves to tell how fast you want to drive. If you’re going uphill, the engine will rev-up automatically; if you go down hill, the brakes will automatically kick in to hold the speed.
1.8.1.2 Normal driving
To drive the vehicle, you just press the accelerator pedal and the control system does the rest. You will notice changes in engine speed as they are required to satisfy your needs. Special care is taken to preserve the advantages of converter drive : if you release the accelerator pedal partially, you will notice that the vehicle coasts as in normal converter drive mode. It’s only if you release the accelerator pedal significantly that active braking causes significant braking.
To guarantee precise manoeuvrability under the most demanding circumstances, a special creep mode was designed offering ‘millimeter precise’ control using a single pedal (even on a 20% slope with a significant load). There’s no longer the need to use the brakes together with the throttle pedal – the APC200 takes care of this for you.
1.8.1.3 Direction reversals
When you change the shift lever direction, the controller will (depending on the situation)
automatically de-throttle the engine and apply the service brakes to decelearte the machine. When the speed is low enough, the engine is accelerated again and the brakes are turned off.
1.8.1.4 Integrated inching
The APC200 senses the position of the fork lifting control (either directly using an analogue input or through the CAN bus) and uses it to decide whether or not to engage the inching mode. So, simply lifting the forks automatically engages the inching system. Furthermore, the engine speed is raised proportionally to the lever movement, giving more precise control over the lifting action.
The switch from engine drive to inching drive is so smooth that you generally don’t feel the transition. Additionally, the inching system now operates in any gear position up to a speed of 10 kph (parameter).
When the fork lever is released, the controller switches back to hydrostatic drive mode as smooth as possible.
2. Safety related requirements
2.1 Applicable safety guidelines
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 26/652.2 Safety concept
2.2.1 General
The safety concept is based on the control system's safety classification according to ISO 1508 and on the definition of the Fail Safe State for a powershift transmission used in earthmoving equipment.
The applicable safety class requires considering single faults affecting driver safety and a redundant method to achieve the fail-safe state in case of a single safety critical fault. For earthmoving equipment, acceptable fault conditions are considered to be:
- Fail to higher range - Fail to next lower range
The fail-safe state (to be attained when all else fails) is: - Fail to Neutral
2.2.2 ECM/APC200 implementation
The control valve concept guarantees fail to Neutral in case of loss of power through use of a redundant normal open Drive solenoid. A pressure switch that measures the system pressure after the Drive solenoid can monitor its function.
These properties are used in the APC200 to implement the safety concept.
ECM requires that 2 clutches can be pressurised simultaneously. Normally the pressure in 1 clutch is increasing while the pressure in the other clutch is decreasing. If the overlap is not carefully monitored, one can achieve a situation in which clutch 1 is closed while clutch 2 is not opened yet. This situation is called "locking clutches." The result is that the transmission stops instantly. The APC200 software deals with potential problems related to this by continuously monitoring relations between and changes in various speed signals.
All faults described below refer to electrical connections. The APC200 is in no way capable of detecting mechanical problems on its input and output devices except indirectly by analysing the speed signals.
The APC200 monitors its inputs and outputs in order to detect internal and external faults. Due to hardware limitations, fault monitoring is not always possible. The detection principles and their limitations are described wherever applicable.
All detected faults are reported within 0.3 seconds, but only safety critical faults are acted upon. Faults resulting in loss of drive are tolerated.
Faults resulting in unwanted clutch engagement result in immediate selection of Neutral using one of two available redundant shutdown methods. Depending on the severity, this reaction can be permanent (until power is switched off) or last until the fault is removed.
Some faults are tolerated but the performance of the system is crippled when the fault persists.
2.3 Considered faults
• Over voltage • Under voltage
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 27/65• Internal faults
• Program out of control • Single faults on outputs • Incorrect input patterns • Intermittent power loss • Speed sensor faults • Analogue sensor failure
• Redundant Shutdown Path fault
2.4 Behaviour in case of faults
2.4.1 General
It is considered critical to be able to select Neutral in all circumstances. Selection of Neutral also is considered the safe state in case of many faults.
The APC200 has been designed to guarantee automatic selection of Neutral in some conditions. This is accomplished through use of two separate watchdog timers and a redundant shutdown path for outputs.
2.4.2 Reset Condition
When power is applied, the APC200 first selects Neutral without range clutch engaged and starts initialising itself. This includes a series of self-tests to assure system integrity.
This position is believed to be the safest possible condition in case of an intermittent power failure. The initialisation phase takes about 1 second. It includes Power On Self Test and integrity testing of the redundant shutdown path.
After power up, the APC200 is in the so-called Neutral Lock State. This means that the transmission remains in Neutral until the shift lever is cycled physically through Neutral.
2.4.3 Over voltage
The APC200 is very tolerant to large transients on its power lines (see also 3.4). Even power supply levels up to 48 V will not damage circuit components.
However, a magneto-resistive sensor supply voltage in excess of about 16.5Vdc prevents the speed sensor circuit from operating (fault indicated).
A fault indication on the display is given to warn the driver of the problem.
2.4.4 Under voltage
The APC200 operates at voltages well below 18 Vdc.
Below 11 Vdc however the APC200 enters the reset condition and shuts off all outputs. Because the APC200 is not involved in functions essential to engine cranking this is not considered as a problem.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 28/652.4.5 Internal faults
At power up a series of integrity checks is done. These tests consist of the following:
• CPU integrity check (ALU, registers, operators) • Internal RAM test (Modified March–C test)
• Program Flash memory integrity check (Modified 16 bit checksum) • External RAM test (Modified March–C test)
• Parameter Flash memory integrity check (Modified 16 bit checksum per parameter) • Redundant Shutdown Path integrity check
If these tests prevent operation as a transmission controller, then the APC200 locks itself in a reset state, with all outputs off.
If faults related to shift limits are detected but controlling the transmission is still possible, the APC200 reverts to shut-down mode (SHDN). In this mode, the transmission can not be operated. Meaning of indication of FAULT TYPE on the display
00.50
• There is a problem related to the Internal RAM (in CPU)00.51
• There is a problem related to the System RAM (in CPU)00.52
• There is a problem related to the external RAM00.53
• There is a problem related to the FLASH program memory2.4.6 Redundant Shutdown Path Error
The term RSP refers to the Redundant Shutdown Path integrated on the transmission control valve as described in 1.4.4 Shutdown mode.
At power up, before the solenoid is activated, the pressure feedback (Analog Input 0) must indicate low pressure. Then after activating the solenoid, the pressure must rise within a given timeout. After power-up, the pressure feedback signal is ignored if the engine speed is lower than 500 RPM. When the engine speed exceeds this limit, this signal is still ignored for an additional 2 seconds to allow the system to build up the pressure.
If any of this fails or occurs too late, permanently flagged faults are generated, and the APC200 is not allowed to operate.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 29/65This RSP is required for ensuring system safety and is permanently monitored electrically and system wide by using pressure feedback. Any fault related to it causes the APC200 to enter Shut Down mode.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 30/65Meaning of indication of FAULT TYPE on the display
20.60
• The Pressure feed back line is Stuck at 0 – i.e. shorted to ground20.61
• The Pressure feed back line is Stuck at 1 – i.e. shorted to Vbat or not connected20.62
• There a fault related to the Pressure Feedback (Fault code 50.XX)20.63
• There is a problem with Digital output DIG0. The RSP cannot function properly. The system will be in Shutdown Mode20.64
• There is a problem with Digital output DIG3. The RSP cannot function properly. The system will be in Shutdown Mode20.65
• The responsiveness of the RSP at power-up was to slow2.4.7 Program out of control
The watchdog timers reset the APC200 automatically if due to a program disturbance either one is not timely reset (150 ms).
Additionally, during program execution, critical variables are continuously checked for content integrity. If faults are detected, the APC200 defaults to the reset state.
2.4.8 Intermittent power loss
After power is restored, the APC200 enters the reset condition, resulting in the immediate selection of neutral – no clutch engaged.
It stays there until the shift lever is placed in Neutral and the vehicle speed drops to a safe level at which moment normal operation starts (selection of 1st or 2nd depending on application
preferences).
In absence of power, the transmission defaults to Neutral (provided the redundant Drive solenoid operates as expected).
2.4.9 Single faults on analogue outputs
General
Faults related to analogue outputs are detected by various principles. Besides being monitored just like ON/OFF outputs the current through their sense line is compared to the target current.
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APC200 Control System
Description for ECM / ECI
Ten Briele 3, 8200 Brugge, Belgium Controls 08 march 2002 Tel: +32/50/402459 [email protected] Doc P/N : 4207049 Rev 1.1 31/65Faults related to outputs A02, A04, A06, and A08
These outputs control pressure modulators and have the capability to lock conflicting clutches. Faults on them are considered critical. Any single fault on them results in the selection of Limp Home mode.
Faults related to outputs B01, B03, and B05
These outputs are not involved in transmission control. Faults on them are flagged if they are used in the application, but no further action is taken.
Meaning of indication of FAULT TYPE on the display
71.00
• The output wires are shorted to each other • The Sense line is shorted to Vbat • The Plus line is shorted to Ground71.01
• The output is not connected or its Plus line is shorted to Vbat71.02
• The output current exceeds 1400 mA (not quite a short yet)71.03
• The output current is Out Of Range. Typically, this occurs when the load has the incorrect impedance.Note that the first two digits identify the output exhibiting the fault :
