Variable Flow Oil Pump

WARNING: This page is about a different car, the 2018 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The variable flow oil pump draws oil from the oil pan through a centrally mounted pickup pipe. The oil is pressurized and pumped through a bore in the cylinder block. After passing through an anti drain valve and a plate type oil cooler, the oil is filtered by a replaceable oil filter element installed in the oil filter housing.

The variable flow oil pump is a vane cell pump with an eccentrically mounted control ring. The variable flow oil pump has a volumetric flow control mechanism to reduce the required drive output. The flow delivery can be adjusted using the control ring. Applying oil pressure to the control ring allows it to be adjusted against the force of an opposing control spring.

The eccentricity of the control ring can be decreased or increased, with increasing eccentricity increasing the output flow. The output of the variable flow oil pump is adjusted appropriate to engine load and speed to reduce load on the engine. An oil pressure control solenoid, operated by a Pulse Width Modulation (PWM) signal from the Powertrain Control Module (PCM), adjusts the oil pressure to the control ring to adjust the output flow.