VP-37 The VP37 family of EDC pumps are port controlled systems similar to the conventional mechanical distributor pumps. The high pressure is generated by the pumping action of the plunger as the cam plate rides over rollers, producing a rotating-reciprocating motion. The ‘end of delivery’ is controlled by the relative position of the control sleeve with respect to the outlet port in the plunger. The system incorporates an Eddy current positioner for controlling the injected fuel quantity and a solenoid valve for controlling the injection begin. The application specific maps for start quantity, idle, full load, accelerator pedal characteristic, smoke limitation, etc. are programmed into the ECU.Today’s small, high speed diesel engine demands a lightweight and compact fuel-injection installation. The VE distributor pump fulfils these stipulations by combining fuel-supply pump, high pressure pump, electronic governor and timing device in a small compact unit.

Electronic Control Unit (ECU) The ECU for the EDC (Electronic Diesel Control) uses a microcontroller and a program and a data storage utilizing Flash technology. Its major assignments are control of the high-pressure generation, and of start-of-injection and duration of injection. In addition, the ECU is responsible for a range of other functions such as glow control (GZS) and system monitoring. By means of CAN (Controller Area Network), it is a simple matter to network the ECU with other systems in the vehicle. For instance with the electronic transmission-shift control, the Antilock braking system (ABS) or the air-conditioning system

Sensors: : In combination with the cam sensor signal the speed sensor signal

re of the

endently

Speed sensordelivers the absolute angular crankshaft position to the combustion TDC of the first cylinder. The speed sensor works on the principle of variable reluctance.

Phase sensor: The Hall Effect camshaft sensor identifies the position of the camshaft in combustion engines. Together with the speed sensor signal the camshaft sensor signal supplies the absolute angular position of the crankshaft referred to top dead center (TDC) of the first fired engine cylinder.

Accelerator pedal module: is used to measure the accelerator pedal angle. It features a sensor integrated into the accelerator pedal which recognizes the driver's command and forwards a corresponding signal to the control unit. Water temperature sensor: The temperature sensor measures the temperature of the engine, e.g., in the coolant water circuit.

Fuel temperature sensor: The temperature sensor measures the temperature of the fuel, e.g., in the fuel filter. Boost pressure sensor: The Boost- pressure sensor is used to measures the pressuaspirated or charged air in the intake-manifold with pressure controlled injection systems.

Hot-film air mass meter: The hot-film air mass meter serves for the measurement of the air mass sucked by the engine of diesel injection systems indepof the atmospheric pressure and temperature.

Rail pressure sensor: The high pressure sensor serves for the measurement of the fuel pressure in the fuel pressure accumulator (High pressure rail) by diesel engines with Common rail-injection systems.