The high-pressure common rail system is a new concept of fuel injection system, which can improve the performance of diesel engines in all directions, making it a hot topic in the field of diesel engine research. Its composition mainly includes high-pressure pump, common rail pipe with pressure regulating valve, fuel injector with battery valve, electronic control unit and various sensors. The following is an introduction to the working principle and installation position of each sensor of the engine.
Controller ECU characteristic parameters
Feature parameters:
① Working voltage: 24V (9~32);
② Working environment: – 30 ~ 105 degrees
③The ECU shell is required to be well insulated from the body;
The installation method on the engine is adopted to prevent the temperature of the engine body from being transmitted to the ECU, so a cooling box is installed between the ECU and the engine body to ensure that the ECU works at the allowable temperature.
High pressure fuel pump
(Take the structure of CPN2.2 high pressure oil pump as an example)
Inline double plunger high pressure oil pump
Integrated fuel metering unit MeUN, which controls the rail pressure
Integrated ZP5 gear oil delivery system
The fuel filter is located on the pressure side of the gear pump
lubricated with oil
Drive speed ratio (deceleration): 6L/6M/6K: 1:2
Theoretical oil supply rate of high pressure oil pump: 4.524cm3/rev
Maximum allowable track music: 1600bar
Spring rated speed: 1400r/min
Counterclockwise rotation (viewed from drive end)
Common rail pipe
1. Characteristic parameters:
Connector: three output terminals, respectively signal, ground, 5V power supply
Rated 30~160MPa
Maximum value: 160MPa
1. Electronic connector 2. Evaluation circuit 3. Film with sensor device 4. High pressure connector 5. Fixed thread
2、The sensor element on the sensor film converts the pressure change in the high-pressure pipeline into a voltage signal and sends it to the ECU. In case of damage, the pressure control valve is triggered by the set value through the emergency (backup) function
3. Features:
Integrated on the common rail pipe;
The maximum pressure is 1600bar;
4. Related control strategy: rail pressure closed-loop control
5. Failure modes and strategies:
crankshaft/camshaft sensor
Function:
Accurately calculate the position of the crankshaft, used for the calculation of fuel injection timing, fuel injection quantity, and speed calculation
characteristic:
Variable reluctance type, installed on the gear chamber;
Air gap: 0.5mm—1.5mm;
Static resistance value: 860 ohms
Working environment: -40 degrees – 120 degrees;
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The high-pressure common rail system is a new concept of fuel injection system, which can improve the performance of diesel engines in all directions, making it a hot topic in the field of diesel engine research. Its composition mainly includes high-pressure pump, common rail pipe with pressure regulating valve, fuel injector with battery valve, electronic … Engine sensors