High-pressure control

The quantity control valve adjusts the fuel supply from the low pressure side to the high pressure side of the high pressure pump in order to achieve the required rail pressure. The quantity control valve is hydraulically forced open once a certain pressure has been reached in the high pressure side of the high pressure pump. The quantity control valve is a component of the high pressure pump.

The signal from the rail-pressure sensor is an important input signal of the DME for activation of the quantity control valve (component of the high pressure pump). If the rail-pressure sensor fails, the quantity control valve is activated in emergency operation by the DME.