Automobile speed sensor is the information source of automobile electronic control system, and it is also the key component of automobile electronic control system, and one of the core contents in the field of automobile electronic technology. It detects the speed of the electronically controlled car, and the control computer uses this input signal to control the engine idling speed, the automatic transmission torque lock, the automatic transmission shift and the opening and closing of the engine cooling fan and cruise control and other functions.
1 - Front axle electric active roll stabilizer bar; 2 - right front wheel acceleration sensor; 3 - engine room 12V battery; 4 - right rear wheel acceleration sensor; 5 - Vertical dynamic management platform; 6 - Right rear power distribution box; 7 - Power control unit PCU; 8 - rear axle electric active roll stabilizer bar; 9 - left rear wheel acceleration sensor; 10 - left front wheel acceleration sensor
Introduction to the function of speed sensor
Wheel speed sensor When detecting the wheel speed signal on the car, the most commonly used sensor is the electromagnetic induction sensor, the general practice is to install the sensor on the non-rotating part of the wheel assembly (such as the steering knuckle or shaft head), and with the wheel to rotate with the magnetic material made of teeth ring. When the gear ring rotates relative to the sensor, due to the change of magnetoresistance, the sensor is stimulated to produce an alternating voltage signal, the frequency of this alternating voltage is proportional to the wheel speed, the ECU uses a special signal processing circuit to convert the sensor signal into a square wave of the same frequency, and then calculate the wheel speed by measuring the frequency or period of the square wave.
The speed sensor is a device used to detect the speed of the electronically controlled vehicle, and the control computer uses this input signal to control the engine idling speed, the automatic transmission torque lock, the automatic transmission shift and the opening and closing of the engine cooling fan and the cruise speed and other functions. Magnetoelectric speed sensor is an analog AC signal generator, usually consisting of a magnetic core with two terminals and a coil. The speed sensor detects the speed of the electronically controlled car, and the control computer uses this input signal to control the engine speed, automatic transmission torque lock, automatic transmission shift and engine cooling fan opening and closing and cruise control and other functions.