Engine Control System 1A-15 TCV (Timing Control Valve) TCV using a solenoid valve is installed to the oil pressure timer. Duty (energizing rate) controlled current with ECM increases or decreases the valve opening time to control the oil pressure in the high pressure chamber side. The timer piston is moved by the balance with the timer spring. By sliding the cam ring connected movably with the timer piston in the rotating direction, the injection timing is controlled. Legend 1. Cam ring 2. Low pressure chamber 3. Timer spring 4. TCV 5. High pressure chamber 6. Timer piston 7. From ECM Electronic Control Distributor Pump System electronically controlled with ECM (engine control module).
System Overview The accelerator control uses an accelerator position sensor. The accelerator sensor of the potentio meter (variable resistance) type is installed to the accelerator pedal. Reference voltage is constantly applied to the sensor from the ECM (engine control module) to detect the accelerator pedal stepping angle from changes of voltage. An idle position switch (accelerator switch ) is also installed to the accelerator pedal. The idle position switch (accelerator switch ) is turned ON when the accelerator pedal is released and OFF when the accelerator is stepped on.
ECM detects the accelerator pedal stepping angle as AP (accelerator position) signal and after calculating, transmits SPV (spill controller valve) drive signal to EDU (engine driver unit). EDU enables high speed drive of SPV which controls fuel injection amount. The fuel injection amount is controlled by opening and closing the fuel high pressure circuit with the high response SPV. SPV is incorporated in the injection pump. The spill control valve and timing control valve are 1 6 5 2 3 4 7 LNW21ASF000401