Pump control

VP44 manages the operation of the pump, as we know, electronic engine control system EDC. The first VP44 and VP30 pumps required two controllers: the MSG engine control unit and the PSG injection pump control unit . Thus, in the first generation, the two drivers perform separate functions. The pump controller is the top of the injection pump and serves as the end stage for the high pressure solenoid valve and the injection actuator solenoid valve.. A pump shaft rotation angle sensor is mounted in the injection pump, measuring the speed and position of the injection pump. For timely control of the solenoid valve, the controller needs information from an angular position sensor. There is also a fuel temperature sensor in the injection pump, from which the controller needs information to calculate the injected fuel mass. All other sensors transmit their measurement data to the engine control unit. The data exchange between the injection pump control unit and the engine control unit takes place via the CAN data bus.

The engine control unit is used to calculate the injected fuel dose, in addition to the rotational speed read from the crankshaft position sensor, it still needs information about the engine load applied by the driver. This information is obtained from the accelerator pedal position sensor.

Only when the driver fully depresses the accelerator, torque and smoke limitation starts to take effect. The torque limiting system prevents overloading of the driveline or activates the ASR or ESP system. Smoke reduction is based on the values ​​provided by the air flow meter and the calculation of fuel doses depending on the engine speed..