139 Description Minimum
6. Description of operation : Passive elements
D4EA02QPP0
DESCRIPTION - OPERATION : FUEL FILTER
1. Description
Figure : D4EA0GOD
(1) Fuel filter.
"a" Intake of fuel from the tank . "b" Manual priming pump.
150
"d" Water decanting outlet.
"e" Fuel filter outlet to the high pressure fuel pump.
2. Role
Role of the fuel filter :
To filter the fuel
To decant the water
To heat the fuel
N.B. : Fuel heater function incorporated in the fuel filter.
3. Operation
The fuel enters the fuel filter.
The fuel is filtered by filtering element.
The water contained in the fuel is decanted and stored in the water collector of the fuel filter.
4. Electrical specifications
Not applicable.
5. Initialisation /Initialisation
151
D4EA02LYP0
DESCRIPTION - OPERATION : FUEL HIGH PRESSURE COMMON INJECTION
RAIL
1. Description
Figure : B1HA0CDD
(1) Fuel high pressure common injection rail. "a" Fuel high pressure sensor.
"b" Fuel outlets to the diesel injectors.
"c" Fuel inlet coming from the high pressure pump.
2. Role
Role of the high pressure fuel common injection rail :
To store the amount of fuel required by the engine regardless of the operating phase
To damp the pulses created by injections
To link the components of the fuel high pressure circuit
Components connected to the fuel high pressure common injection rail :
High pressure fuel supply pipe
Diesel injector supply pipes
152
3. Operation
The fuel high pressure common injection rail is supplied at "c" by the fuel high pressure pump, then it redirects the diesel fuel to the diesel injectors at "b".
4. Data
Continuous maximum pressure Peak maximum pressure Accidental pressure Unit
1650 1850 2500 Bar
5. Programming/initialisation
Not applicable.
D4EA02UZP0
DESCRIPTION - OPERATION : DIESEL FUEL COOLER
1. Description
Figure : B1HA0EAD
(1) Diesel fuel cooler. "a" Diesel fuel inlet.
"b" Diesel fuel return to tank.
2. Role
The diesel fuel cooler cools the fuel heated by the fuel high pressure pump, as it returns to the fuel tank.
153
3. Operation
Figure : B1HA0EBD
"A" Hot fuel. "B" Cooled fuel. "a" Diesel fuel inlet.
"b" Diesel fuel return to tank.
The fuel cooler is fixed underneath the vehicle.
The walls of the diesel fuel cooler are cooled by contact with the outside air. The diesel fuel is cooled by being in contact with the walls of the diesel fuel cooler.
4. Electrical specifications
Not applicable.
5. Initialisation /Initialisation
154
D4EA02V8P0
DESCRIPTION - FUNCTION : TURBOCHARGER AIR COOLER
1. Description
Figure : B1HA0EDD
(1) Turbocharger air cooler. "a" Turbocharger air inlet. "b" Turbocharger air outlet.
2. Role
The turbocharger air cooler cools the air entering the cylinders, to increase the density of air in the cylinders.
155
3. Function
Figure : B1HA0EED
"A" Fresh air. "B" Hot air.
"a" Turbocharger air inlet. "b" Turbocharger air outlet.
The walls of the turbocharger air cooler are cooled by contact with the outside air coming from the front of the vehicle.
The turbocharged air is cooled by being in contact with the walls of the turbocharger air cooler.
4. Electrical features
Not applicable.
5. Programming/initialisation
156
D4EA02MUP0
DESCRIPTION - FUNCTION : CATALYTIC CONVERTER
1. Description
Figure : B1JA00PD
(1) catalytic converter. "a" Exhaust gas inlet. "b" Exhaust gas outlet. make : FAURECIA.
Composition of the cat converter :
A stainless steel casing
A thermic insulator
A ceramic honeycomb core impregnated with precious metals
2. Role
The purpose of the 2-way catalytic converter is to transform, by oxidation, the carbon monoxide (CO) and the unburnt hydrocarbons (HC) into water (H2O) and carbon dioxide (CO2).
The second role of the catalytic converter is to permit an increase in the temperature of the exhaust gas, by post-combustion of the unburnt hydrocarbons (HC) resulting from the post-injection.
157
3. Function
Figure : B1JA00QD
(1) catalytic converter.
"c" honeycomb ceramic block. "d" Precious metals.
The carbon monoxide (CO) and the unburnt hydrocarbons (HC) are transformed by a chemical reaction caused by the catalytic converter.
Temperatures of the exhaust gases entering the cat converter :
Approximately 150°C (Without regeneration )
Approximately 350°C (With regeneration )
During the regeneration phase, the catalytic converter burns the fuel resulting from the post-injection at the catalytic converter and allows the exhaust gas to reach 450°C.
4. Data
Not applicable.
5. Learning / Initialisation
158
D4EA02MVP0
DESCRIPTION - FUNCTION : PARTICLE FILTER
1. Description
Figure : B1JA00ND
(1) Particle filter .
"a" Exhaust gas inlet (after the catalytic converter). "b" Exhaust gas outlet.
make : FAURECIA.
The particle filter is a porous structure of silicon carbide including channels arranged so as to force the exhaust gases to pass through the walls.
Components retained in the particle filter :
Carbon particles
Cerine
Deposits from the engine oil and engine wear
2. Role
159
3. Function
Figure : B1JA00OD
"a" Exhaust gas inlet (after the catalytic converter). "b" Exhaust gas outlet.
"c" Outlet channels. "d" Inlet channels.
The particle emission filter is made up of entry channels closed at their end, which forces the exhaust gas to go through the walls of the channels. These work as a filter and retain the particles.
Essentially consisting of carbon and hydrocarbons, these particles on the particle filter burn in the presence of oxygen at a temperature of 550°C (natural regeneration or with the assistance of post injection).
The use of cerine makes it possible to lower the combustion temperature of the particles to 450°C (Temperature of the exhaust gas at the outlet from the catalytic converter during the regeneration phase ).
Cerine is an inorganic material which does not burn and is retained in the particle filter in the form of a solid deposit.
N.B. : The accumulation of particles whilst the engine is operating leads to the progressive clogging up of the particle filter.