The intake shutter is mounted on the intake manifold. The intake shutter is fully open when the engine is operating. To stop the engine, the VSV operates in accordance with the signals from the ECU, and (more…)
Diesel Engine Control System
Diesel Throttle Outline (1CD-FTV/15B-FTE)
The diesel throttle is mounted on the intake manifold. The throttle valve, which operates independently from the accelerator pedal, uses the diesel throttle control motor (step motor) to regulate the throttle (more…)
Diesel Engine Fuel Pressure Control
Determining Common-rail Fuel Pressure
A fuel pressure that matches the operating conditions of the engine is calculated according to the actual injection volume that has been determined based on the signals (more…)
Determining Injection Timing Reference
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 (more…)
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.
2. (more…)
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
3. (more…)
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 (more…)
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) (more…)
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 (more…)
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 (more…)