Hydraulic Control

Hydraulic Control

The main oil pump powered by the torque converter generates oil pressure during vehicle operation with the combustion engine.







The oil pump consists of an outer rotor with internal gear teeth and an inner rotor with external gear teeth and works according to the principle of a rotor pump. The outer rotor circles around the gear teeth on the inner rotor and rotates in the pump housing as a result.

The inner rotor has one gear tooth less than the outer rotor so that during a rotation, fluid passes from one tooth gap to the next on the outer rotor. During the rotary movement, the gaps at the intake side increase in size while the gaps at the pressure side decrease in size accordingly. This design allows the pump to generate high pressures at a high flow rate.

The oil pump lubricates and supplies pressure oil for the complete transmission. The main oil pressure inside the slide-valve gearbox is regulated to the pressure required at the specific moment and the corresponding switching elements are activated, depending on which gear is engaged.

Overview of activated switching elements







The table contains an overview of switching elements activated in different gears and selector lever. Special functions which require solenoid valve 2, for example, are not listed.