High-pressure control

The volume control valve adjusts the flow of fuel from the low-pressure side into the high-pressure side of the high-pressure pump. This achieves the desired rail pressure. The volume control valve is forced open hydraulically as of a certain pressure in the high-pressure side of the high-pressure pump. The volume 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 volume control valve (component of the high-pressure pump). If the rail-pressure sensor fails, the volume control valve is activated in emergency operation by the DME.