chinese aftermarket tachometer sensor

• 2023-08-10

We provide the Chinese aftermarket tachometer sensor. The Hall sensor also adds a magnet equally to the rotating body, and the sensor is fixed against the magnet. When rotating, the sensor and magnet overlap, induce once, and the output pulse jumps. The faster the speed, the higher the frequency output. The frequency of the output level is proportional to the speed, and the measured frequency measures the speed. The frequency can also be converted into a voltage or current signal.

Working principle of Hall sensor: Add a magnet equally to the rotating body, and the sensor is fixed against the magnet. When rotating, the sensor and magnet overlap, induce once, and the output pulse jumps. The faster the speed, the higher the frequency output. Working principle of disc sensor: Generally, the visible and invisible parts can be engraved on the disc, or the gear can be used (with low accuracy), and then the photoelectric switch is used for collection. When the light blocking part on the rotating disc or gear disc becomes the non light blocking part, the photoelectric switch will respond to the output high and low levels, and the frequency of the output level is proportional to the speed. The measured frequency measures the speed, and the frequency can also be converted into a voltage or current signal.

What is the car's response to the problem of speed sensor signal malfunction? It may be that the engine electronic control unit has not received the speed signal, or the received signal is unstable, resulting in: (1) the distance between the sensor and the target wheel is too large. (2) Short circuit or disconnection of sensor wires; (3) The sensor is damaged. The speed sensor measures the resistance between the sensor legs, which should be between 0.7 and 1.2k. (1) When the resistance value exceeds the specified range, it indicates that the sensor is damaged and the speed sensor should be replaced. (2) If the resistance value is within the specified range, it is necessary to continue checking the wires between the sensor and the engine electronic control unit for short circuits to ground, positive, open circuits, or mutual short circuits between the wires, and promptly repair any problems found. If the circuit fault is not resolved after troubleshooting, the speed sensor needs to be replaced. The above is a complete introduction by the editor to the symptoms of engine speed sensor damage in automobiles. It is an explanation of the symptoms of engine speed sensor damage.