The hydraulic components in the system are:
• Hydraulic unit with hydraulic pump
• Hydraulic cylinder
• Hydraulic lines
The hydraulic pump in the hydraulic unit is driven by an electric motor that operates in
two directions. The two operating directions are realized by a relay circuit in the HKL
control module.
A repeat inhibit is included in the software to prevent overheating ofthe pump motor
during frequent operation of the automatic rear hatch. The repeat inhibit is triggered after
2 minutes of continuous operation and is deactivated again after a cooling-down phase
of 6 minutes.
A proportional valve is included in the hydraulic circuit. When not activated, the valve is
open, i.e. the pressure in the hydraulic system is at the lowest level. This setting also
enables the closing/opening ofthe rear hatch in case of system malfunction. When the
valve is activated, the aperture becomes smaller and the pressure in the hydraulic system
increases. The hydraulic cylinder is operated (piston or rod end depending on direction of
rotation of the hydraulic pump) and the rear hatch is raised or lowered.
Angle Hall Sensor
An angle Hall sensor is used for detecting the position of the rear hatch or detecting the
opening angle of the rear hatch. A voltage value is output dependent on the opening
angle of the rear hatch.
The angle Hall sensor produces an analog linearvoltage signal back to the HKL control
module for tailgate status.
63
E61 Sports Wagon
Angle Hall Sensor Angle Hall Sensor (mounted)
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