Download - Common Rail Denso
BENEFITCommon Rail SystemCommon 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 engineDENSO’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 pressure2. Up to five times multiple injection per cylinder
BENEFIT
Cleaning up diesel exhaust gas Minimizing engine noiseHighly 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 SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’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 pressure2. Up to five times multiple injection per cylinder
BENEFIT
Single Injection(Conventional)
Pilot Injection(First-Generation Common Rail)
Multiple Injection(Five Times)
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’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 pressure2. Up to five times multiple injection per cylinder
BENEFIT
Single InjectionSingle Injection
Pilot Injection
Multiple Injection
Condition・Passenger Car・Engine: 2L / 4cyl・Turbo Direct Injection・Noise at Idlingtime
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’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 Idling
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
Pilot Injection (Two Times)
BENEFIT
-4dB
Multiple Injection (Five Times)Single Injection
Pilot InjectionMultipleInjection
time
Condition・Passenger Car・Engine: 2L / 4cyl・Turbo Direct Injection・Noise at Idling
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’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 technologySensor technologyECU technology
Sensor technology
Common rail technology
Common rail technology
TECHNOLOGY Common Rail System
EGR Valve
DPF
Diesel engines have the advantages of good fuel efficiency and low CO2 emissions. Therefore, DENSO developed a diesel engine management system to further clean up emissions while 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, while improvements in fuel efficiency and torque are achieved. Plus, engine noise and vibration are also reduced.
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
Diesel Engine Management System
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, which 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 fewer compounds, while 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 SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine
TECHNOLOGY
TECHNOLOGY 3 Solenoid Injector
160MPaQpilot :2mm3/st , Qpre: 2mm3/st , Qmain:80mm3/st , Qafter:5mm3/st , Qpost :2mm3/st ,
1.0ms
Drive Current(A)
Valve Lift(μm)
From Rail(high pressure)
Command Piston
Nozzle
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, two-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 which a maximum of five injections takes place. As a result, exhaust gas is cleaner while 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
time
Common Rail SystemCommon Rail System
DENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engineDENSO’s second-generation 1,800-bar common rail for cleaner and quieter diesel engine