Height Sensors

The suspension height sensors measure suspension displacement at each corner of the vehicle and output a corresponding analogue signal to the Chassis Control Module (CHCM). The algorithms in the CHCM calculate the position of the signals and use the results for height control.

The sensing element consists of Hall effect devices arranged to measure the direction of the magnetic field of a small magnet attached to the end of the sensor shaft. As the sensor shaft rotates, so do the lines of magnetic flux from the magnet. The signals from the Hall effect devices are processed by means of a dedicated integrated circuit to generate an output voltage. The output voltage varies as the sensor shaft is rotated. The sensor has a measurement range of ± 40° around its nominal position and the nominal sensitivity is 57 mV/° of shaft rotation.

The following graph shows the vehicle height displacement from normal against output voltage for the front height sensors. The center line represents the nominal condition but depending on tolerances, the actual line may lie anywhere between the upper and lower lines.

Front Height Sensor 

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The following graph shows the vehicle height displacement from normal against output voltage for the rear height sensors. The center line represents the nominal condition but depending on tolerances, the actual line may lie anywhere between the upper and lower lines.

Rear Height Sensor 

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

Height Sensor Voltage 

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC