Conventional EFI-diesel
Common-rail EFI-diesel
4. Comparison of the target injection timing and the actual injection timing
As with the convention EFI-diesel, the basic injection timing of the Read more Determining Injection Timing Reference
control
Other Types of Diesel Engine Controls
1. Engine speed correction control
Symptom:
Increased injection volume due to a rise in the pressure in the pump.
Description of control:
Injection volume reduced according to the engine speed.
Determining Injection Timing
The ECU performs the following functions to determine the injection timing:
Conventional EFI-diesel
1. Determination of the target injection timing
2. Detection of the actual injection timing
Determining Injection Volume
The ECU performs the following three functions to determine the injection volume:
1. Calculation of basic injection volume
2. Calculation of maximum injection volume
3. Comparison of basic injection Read more Determining Injection Volume
Diesel Engine Control System – Types of Sensor
Engine Speed Sensor
The engine speed sensor is fitted in the injection pump. It consist of a rotor that is pressed over a drive shaft, and a sensor. Electric signals are generated in the sensor (coil) Read more Diesel Engine Control System – Types of Sensor
Precautions for Removing and Reinstalling Parts
The common-rail system consists of precision parts and uses highly pressurized fuel. Therefore, extreme care must be taken to ensure that foreign matter does not enter the system.
1. Thoroughly clean Read more Precautions for Removing and Reinstalling Parts
Diesel Engine Control System Injector Overview
The signals from the ECU are amplified by the EDU to operate the injector. High voltage is used particularly when the valve is open in order to open the nozzles. The injection volume and timing are controlled Read more Diesel Engine Control System Injector Overview
Operation of Pressure Discharge Valve/Pressure Regulator
When the fuel pressure of the commonrail becomes higher than the target injection pressure, the pressure discharge valve receives a signal from engine ECU, in order to open the valve and send fuel back Read more Operation of Pressure Discharge Valve/Pressure Regulator
Generation of Fuel Pressure in the Supply Pump
The two sets of opposing plungers are driven by the inner cam via the rollers. The inner cam is driven by the engine via the timing belt. The inside of the inner cam, which is elliptic, comes in contact Read more Generation of Fuel Pressure in the Supply Pump
System Configuration of Supply Pump
1. Outline
The fuel that has been drawn up from the feed pump located inside the supply pump is pressurized to the required pressure. The plunger in the pump generates the required injection pressure. Read more System Configuration of Supply Pump