Hydraulic Fluid Pressure Sensor/Switch: Description and Operation

Pressure Sensor

The pressure sensor is fitted directly on the valve block.

Via the pressure sensor, the SMG control module recognizes whether the oil pressure in the accumulator is sufficient and when the hydraulic pump has to be activated and/or switched off.

In order to ensure that the gear shifts run without any problems under all operating conditions, a certain oil pressure must be present in the system.

Brief description of components
The oil-pressure sensor is supplied with current via the sensor-supply voltage (5 V) from the SMG control module.

The measuring range of the oil-pressure sensor lies between 0 - 80 bar. The evaluation is in the range of 35 - 40 bar, 44 - 55 bar and approx. 80 bar. The system pressure is approx. 44 - 55 bar.

The prevailing oil pressure and its change is picked up by the oil-pressure sensor, converted into a voltage signal and transferred via the information cable to the SMG control module.