Electronically controlled mechanical injection pump

High Speed solenoid controlled distributor fuel-injection pumps VE-MV

On the electronic solenoid valve controlled distributor pumps, the fuel injection is controlled by a high-pressure solenoid valve. This permits an even higher degree of flexibility in the fuel metering and in the variability of the start of injection.

This system also incorporates a pump mounted ECU on the upper side of the pump and uses hybrid other techniques. In addition to the mechanical loading with which it is confronted in the vehicle��s under-hood environment, the pump must also fulfil the following assignments:

     Data exchange with the separately mounted main ECU

     Evaluation of the signal from the angle-of-rotation sensor

     Triggering of the high-pressure solenoid valve & timing device,

Maps are stored in the pump ECU which not only take into account the setting points for the particular vehicle application and certain engine characteristics, but also permit the ability of the received signals to be checked. The high pressure generated in the high pressure chamber (the fuel from the supply pump is compressed by the axial piston when this is forced up by the cam plate riding over the rollers of the roller ring) opens the delivery valve and the fuel is forced through the pressure line to the injector. Injection pressure at the nozzle is 1400 bar. Excess fuel is directed back to the tank through return lines. If the high-pressure solenoid valve should fail, fuel injection stops. This prevents uncontrolled ��racing�� of the engine.