As for automobile traffic safety and intelligent vehicle system demand, vehicle sensor demand will increase. In all vehicle sensing assembly, to vehicle safety sensing component of the average annual growth rate reached 13.7%, the highest, these signs, for the safe demand is the main driving force of automobile industry. So we think the vehicle sensors, vehicle sensors is called auto input device of computer system, it put the car running in various conditions of information, such as speed, all sorts of medium temperature, the engine operating condition, to convert the electrical signal transmission to the computer, in order to make the engine work in the best condition. A lot of vehicle sensors, sensor fault judgment, should not only consider the sensor itself, but should consider the failure of the entire circuit. Therefore, in the search failure, in addition to check sensor, also check the wiring harness, connectors and sensors and electronic control unit between the circuit. The so-called sensor, in simple terms: to be provided to the feelings of measurement and according to certain rules can be used to convert the signal of the device or device, usually by the sensor and conversion components".

The sensor is a detection device, can feel the measured information, and can check measuring perceived information according to a certain rule, transform it into the electrical signal or other desired information in the form of output, in order to meet the needs of information transmission, storage, display, record, manage and control requirements. It is to realize the automatic detection and automatic control of the primary link. However, by the traffic safety and control requirements of the upgrade, the sensor is applied gradually to the actuator or motor direction, radar technology is the application of the principle of sensor, automotive radar system can send out radio frequency electromagnetic wave, these waves encounter the car in front of vehicles or other objects can be reflected back, radar chip responsible for sending and receiving the RF signal, and through the background processing. Background data on the estimation results can determine the distance of vehicle and other vehicles and other vehicles speed. Therefore, when the predicted to occur. Therefore, when the vehicle collides, seat headrest and seat belt will advance ready, help reduce accidents caused by impact. Of course, is the vehicle equipped with an airbag is the basic vehicle safety a major field of application. The current global automotive traffic safety is the main driving force comes from government regulations, consumer awareness and car manufacturer itself, so it is with regard to the safety of products related to growth rates, these years are able to maintain stable growth, but also created a vehicle sensor market booming exhibition. Basically, the car used by the sensor assembly more easily in the process of running environment by rigorous tests, including: dust, wet, salt, fuel additives, such as vibration and shocks, therefore, strict criteria are required.