[3] Fuel Injection Timing Control The characteristics of the fuel injection timing vary depending on whether it is the main injec- tion or the pilot injection. Although either the NE sensor or the auxiliary NE sensor is the ref- erence for controlling the injection timing, the NE sensor is ordinarily used for this purpose. (1) Main Injection Timing a. The basic injection timing is calculated in accordance with the final injection quantity, the engine speed, and the water temperature (with map correction). b. While starting, it is calculated in accordance with the water temperature and the engine speed.
Basic Injection Timing Final Injection Quantity Engine Speed Q000138E (2) Pilot Injection timing (Pilot Interval) a. The pilot injection timing is controlled by adding the pilot interval to the main injection timing. b. The pilot interval is calculated in accordance with the final injection quantity, the engine speed, and the water temperature (with map correction). c. While starting, it is calculated in accordance with the water temperature and the engine speed. Pilot Interval Final Injection Quantity Engine Speed Q000139E (3) Fuel Injection Pressure a. A value is calculated as determined in accordance with the final injection quantity and the engine speed. b.
While starting, it is calculated in accordance with the water temperature and the engine speed. Rail Pressure Final Injection Quantity Engine Speed 35 Q000140E