For a number of vehicle systems that increase safety and comfort, such as an automatic suspension, level control, as well as automatic headlamp levelling, it is necessary to record the current tilt of the vehicle.
An inductive vehicle level sensor has several coils on the circuit board through which current flows and which generate an electromagnetic field. This circuit board moves a metallic rotor connected with the operating lever of the sensor, which influences the electromagnetic field. Additional coils on the sensor circuit board register a change in the field depending on the lever position of the sensor, which is analyzed by an ASIC specially developed for this purpose.
With this sensor, different angle areas can be realised with consistently high linearity. The inductive axle sensor provides both an analog and a PWM signal. The sensor works with outstanding precision and is completely independent of the temperature. The null position of the sensor can be individually varied. A further development of this sensor is the new inductive sensor, which provides a repeating PWM signal compressed to 75%. Therefore, the sensor can be used across platforms as a shared component. Different installation positions and mounting tolerances are compensated by electronic adjustments in the analysing control unit.
The next developmental goals are the optimisation of the installation space and the improvement of the output signal for chassis applications (vehicle level sensor of the 2nd generation).