What is the role of the wheel sensor in the ESP system?
In order to add new ESP functions and to better control the vehicle's stability system, such as Mountain Hidden Control (HHC) and Wire Control (SbW), Bosch proposed a modular HW and SW concept to develop a third generation Highly flexible and low-cost chronic sensor assembly DRS MM3.x.
Measure the wheel speed of the corresponding wheel! ABS and ESP are the necessary sensors!
When the wheel speed signal is detected on a vehicle, the most commonly used sensor is an electromagnetic induction sensor. The general practice is to mount the sensor on a nonrotating part (such as a steering knuckle or shaft) of the wheel assembly and to rotate with the wheel Magnetic material made of ring gear relative. When the ring gear relative to the sensor rotation, due to changes in the magnetoresistance, the sensor excitation of the alternating voltage signal, the frequency of alternating voltage and wheel speed is proportional to the ECU using a special signal processing circuit to convert the sensor signal to the same Frequency of the square wave, and then by measuring the square wave frequency or cycle to calculate the wheel speed.
