Ride Height Sensor

The control unit obtains information about the ride height of the vehicle via a ride height sensor attached to each of the four wheels.

Fig 1: Identifying Ride Height Sensor Angles

Courtesy of BMW OF NORTH AMERICA, INC.

Ride Height Sensor

The ride height sensor is an angle Hall sensor which is activated by a ring magnet. The ring magnet is polarized vertically from north to south.

The magnetic field line of the ring magnets intersect a Hall cell. The Hall cell is arranged in such a way that only the horizontal components of the field lines are evaluated. This results in different field line strengths at different positions of the ring magnet. The Hall cell measures the field strength of the magnetic flux and converts it into an analog signal with a voltage level between 0.5 and 4.5 V.

Fig 2: Sensor Principle Of Operation

Courtesy of BMW OF NORTH AMERICA, INC.