This is a instruction for Mitsubishi Fuso Fighter 6M60 Engine Injector System Repair.
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A compact, energy-saving solenoid-control type TWV (Two-Way Valve) injector has been adopted.
The TWV (Two-Way Valve) solenoid valve opens and closes the outlet orifice passage to control both the pressure in the control chamber, and the start and end of injection.
a. Non-Injection
When no current is supplied to the solenoid, the TWV (solenoid valve) is pushed downward by the spring, closing the outlet orifice. This equalizes the control chamber pressure forcing the command piston down and the pressure forcing the nozzle needle up. A state of non-injection results because the nozzle needle closes due to the nozzle spring force and the difference in areas to which pressure is being applied.
b. Injection
When current is initially applied to the solenoid, the attraction of the solenoid pulls the TWV (solenoid valve) up, opening the outlet orifice and allowing fuel to flow out of the control chamber. After the fuel flows out, pressure in the control cham-ber decreases, pulling the command piston up. This causes the nozzle needle to rise and injection to start.
c. End of Injection
When current continues to be applied to the solenoid, the nozzle reaches its maximum lift, where the injection rate is also at the maximum level. When current to the solenoid is turned OFF, the TWV (solenoid valve) falls and closes the orifice.
Fuel then flows into the control chamber via the inlet orifice, increasing pressure and causing the nozzle needle to close immediately and injection to stop.
Cylinder Recognition Sensor (TDC Sensor)
• The cylinder recognition sensor is an MRE (Magneto Resistive Element) type. As the teeth in the cylinder recognition sensor pass the sensor, the magnetic resistance in the sensor changes. The change in the voltage generated is convert-ed into a rectangular wave pulse in the IC circuit, and this signal is output to the engine ECU. A cylinder recognition pulsar is installed to the engine camshaft gear, and it outputs the cylinder recognition signal.
The No. 1 cylinder is located 78°CA from the No. 1 TDC reference signal following the irregular pulse. The interval be-tween each cylinder is the same degree.
Fuel Temperature Sensor
The fuel temperature sensor is installed on the supply pump. It detects the fuel temperature and sends a signal to the engine ECU. The detection component utilizes a thermistor in which the internal resistance changes according to the temperature. The temperature versus resistance characteristics are shown in the diagram below.
