BENEFIT
Common Rail System
Common Rail System
The features greatly reduce visible smoke,
particulate matter and NOx while minimizing engine noise.
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
Innovative technologies greatly reduce diesel’s impact on the environment.
1. Up to 1,800-bar injection pressure
BENEFIT
Cleaning up diesel exhaust gas
Minimizing engine noise
Highly precise multiple injection creates combustion to reduce NOx emission and combustion noise.
Diesel fuel is injected into the combustion chamber at ultra high pressures of up to 1,800 bar to ensure more complete combustion for cleaner exhaust gas.
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
Innovative technologies greatly reduce diesel’s impact on the environment.
1. Up to 1,800-bar injection pressure
BENEFIT
Single Injection
(Conventional)
(First-Generation Common Rail)
Pilot Injection
Multiple Injection
(Five Times)
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
Innovative technologies greatly reduce diesel’s impact on the environment.
1. Up to 1,800-bar injection pressure
BENEFIT
Single Injection
Single Injection Pilot Injection Multiple Injection Condition ・Passenger Car ・Engine: 2L / 4cyl ・Turbo Direct Injection ・Noise at Idlingtime
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
BENEFIT
-3ｄB Single Injection Pilot Injection Multiple Injection time Condition ・Passenger Car ・Engine: 2L / 4cyl ・Turbo Direct Injection ・Noise at IdlingCommon Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
BENEFIT
-4ｄB
Multiple Injection (Five Times)
Single Injection Pilot Injection Multiple Injection time Condition ・Passenger Car ・Engine: 2L / 4cyl ・Turbo Direct Injection ・Noise at Idling
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
TECHNOLOGY
High pressure capacity technology Magnetic valve technology High pressure capacity technology Magnetic valve technology ECU technology Sensor technology ECU technology Sensor technology Common rail technology Common rail technologyTECHNOLOGY Common Rail Sy stem
EGR V alve
DPF Diesel engines have the advantages of good fuel efficiency and low CO2 emissions. Therefo re, DENSO developed a diesel engine management system to further clean up emissions w hile improving fuel efficiency. This system is a product of various forms of advanced technology. Among them is the common rail system employed in the fuel injection.
1,800 bar injection pressure is equivalent to the water pressure of a depth of 18,000 meters deeper than the Mariana Trench, the world’s deepest ocean bottom. High response injectors by electronic control feature the highly
accurate multiple injections (five times). As a result, particulate matter and NOx are
markedly reduced, w hile improvements in fuel efficiency and torque are achieved. Plus, engine noise and vibration are also reduced.
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
TECHNOLOGY
TECHNOLOGY 1 Supply Pump
TECHNOLOGY 2 Common
Rail
From Supply Pump
To Injector
Pressure Sensor Pressure Limiter
To Injector Feed Pump Connecting Pipe Cam Shaft Plunger Cam Ring Suction
Control Valve Eccentric Cam To Rail
Housing Supply Pump
Common Rail The first-generation supply pump could generate
pressures of up to 1,450 bar, w hich represented the mechanical limits of the inner cam design. However, to achieve pressures above this,
DENSO developed revolutionary new coating and machining technologies, and by the second-generation design, changed to an outer cam design in the supply pump to achieve pressures up to 1,800.
In order to w ithstand 1,800-bar pressure the rail must be w ithout any clearance or machining error. In response, DENSO developed a special material that contains few er compounds, w hile exhibiting high purity and high hardness properties to enable ultra high-precision machining. Thus, it is possible to create engine components that can w ithstand pressures up to 1,800 bar for use in the common rail system.
Common Rail System
Common Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
TECHNOLOGY
TECHNOLOGY 3 Solenoid Injector
160M Pa
Qpilot :2mm3/st , Qpre: 2mm3/st , Qmain:80 mm3/st , Qaft er:5mm3/st , Qpost :2mm3/st ,
1.0ms Drive Current (A) Valve Lift (μm) From Rail (high pressure) Command Piston Nozz le Solenoid Valve Injection Rate (mm /ms)3
Injector (up to 5 times injection a cylinder)
Compared w ith its first-generation injector (1,450 bar, tw o-times injection) DENSO developed higher-response solenoid actuator and high-pressure injector design. The second-generation injector is able to inject up to 1,800 bar pressure and multiple injection, w ith timing intervals of 4/10,000 seconds during w hich a maximum of five injections takes place. As a result, exhaust gas is cleaner w hile noise is minimized.
In injection control systems, advanced piezoelectric components are employed because of their high speed operation capability. But DENSO was successful in developing conventional solenoids that operate in 0.2 millisecond units.
time
time
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