Oil Pump: Description and Operation

Variable Oil Pump on V8 Engines

The DME control unit is responsible for the demand controlled operation of the variable oil pump, while adjustment is performed hydraulically. Engine management uses the input values for engine speed, temperature and torque. Based on this information, the engaged gear wheel width and therefore the geometric displacement volume of the gear wheel set is changed through the axial movement of a gear wheel (moved hydraulically) and this in turn changes the oil pressure. The pump ensures that only the pumping action required for the relevant load range of the engine is initiated. This reduces the energy consumption of the oil pump to a minimum and also ensures demand controlled lubrication.