Hydraulic Assembly (Pump, Pressure Valve, Lines and Piston)

Hydraulic Assembly







The hydraulic pump (radial piston) of the trunk lid lift is driven by an electric motor which operates in two directions of travel.

The pump is located near the mount for the right rear strut.

It is controlled via a PWM signal from the HKL control unit. The signal is varied depending on the opening angle of the trunk lid to maintain an even closing speed over the entire range.

An electro-mechanical hydraulic pressure valve is integrated into the hydraulic pump. The pressure valve is controlled by a PWM signal from the HKL control unit. The valve is normally open.

The hydraulic pressure increases as the valve is powered closed. The hydraulic pressure, controlled by the PWM signal affects the trunk lid opening/closing force.

The maximum pressure produced by the hydraulic assembly is 100 bar.







The hydraulic piston is attached to the left side trunk hinge.

There is no initialization necessary when exchanging hydraulic components.

The trunk should be operated several times to displace any air that may be in the system.