Oil Pump Valve, Basic Function - GF18.10-P-2000A

Engine All (4xWD) 

Engine All (CAR) 

Example illustration of oil pump valve 

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
• Function 
  • The piston heating function 
  • The oil heating function 
  • Peak/hold function 

General 

The engine oil pump valve (1) electrohydraulically regulates the switchover of the engine oil pump between its hydraulically regulated maximum delivery pressures. In this way supply with engine oil in the engine oil circuit is optimized to the respective demand. The demand-based supply lowers the power loss of the engine oil pump and, as a result, the power loss of the engine.

Function 

The engine oil pump valve (1) is actuated by the combustion engine control unit based on needs- and temperature-dependent characteristics maps.

The engine oil pump valve (1) limits the flow volume of the engine oil that the engine oil pump delivers and compresses.

Switching takes place between the two compression stages at 2 and 4 bar. In order to achieve the greatest possible fuel savings the pressure switchover is extended by in addition to the base function by the following functions:

The piston heating function 

For a cold start one starts with a low oil pressure.

The piston/engine become warm quicker.

The oil heating function 

Following operation of the piston heating function, the engine is run for a certain time with a high oil pressure.

The spray oil cooling of the piston crown activated in this way causes rapid warming of the engine oil.

Therefore oil has a low viscosity quicker and the friction power in the engine drops.

Peak/hold function 

To reduce the power consumption of the switchover valve, the engine oil pump valve (1) is actuated by means of a peak/hold function in a current-controlled manner.