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Application of ceramics in automotive sensors
2020-12-25

As the information source of the automotive electronic control system, automotive sensors are the key components of automotive electronic control systems. The higher the degree of automotive electronics and automation, the greater the dependence on sensors. Some functional ceramic materials can adapt to the harsh environment (high temperature, low temperature, vibration, acceleration, humidity, noise, exhaust gas) unique to the car for a long time and be applied to the car sensor.

 

1. Ceramic temperature sensor. The engine electronic fuel injection system can use ceramic temperature sensors to continuously and accurately measure the cooling water temperature, intake air temperature, and exhaust temperature, so as to correct or compensate the fuel injection amount according to temperature changes, change the idle speed control target value, etc., to obtain the best air-fuel ratio.

2. Ceramic exhaust gas sensor. The zirconia sensor used for automobile exhaust gas monitoring is installed in the manifold or front exhaust pipe. It uses solid electrolyte gas-sensitive ceramic materials to measure the O2 concentration in exhaust emissions, and then feeds the measured value back to the engine intake and fuel supply system , Detect the air-fuel ratio of the engine, and promote the combustion of the fuel to always maintain a full combustion state. In addition to saving fuel, it can also reduce emissions of harmful gases such as CO and NO2. It has high sensitivity, good reliability and long service life.

3. Ceramic knock sensor. The ceramic knock sensor can make the engine work at the ignition time close to knocking, the highest thermal efficiency, and the least fuel consumption, to achieve a knock-free working state, and to ensure its operation with the maximum possible power and economic indicators.

4. Ultrasonic sensor. Ultrasonic sensors are usually composed of aluminum alloy shells, piezoelectric ceramic transducers, sound-absorbing materials, and lead electrodes. They are used as car reversing anti-collision alarm devices to guide the safe driving of cars, especially suitable for long-loaded cars and heavy-duty trucks. , Mining trucks and other large vehicles. Ultrasonic sensors are also used in air flow meters to detect the size of engine air intake.

5. Ceramic acceleration sensor. Ceramic acceleration sensors are used in automobile airbag systems, which can be used to detect the instantaneous low-speed or high-speed collision strength of the automobile, and convert it into electrical signal output to ensure that when the collision strength is high, the airbag is opened accurately and in time to improve the safety performance of the automobile. It is highly accurate and reliable, and can quickly distinguish the actual collision situation.

6. Ceramic humidity sensor. The interior of the automobile humidity sensor is equipped with a porous sintered body made of metal oxide series ceramic materials. The adsorption of water molecules on the surface of the sintered body is used to sense humidity. The characteristic quantity of humidity sensing is resistance, and the humidity is detected by the change in resistance value. The change. It is suitable for the detection of anti-frost and condensation of window glass and the air humidity of the engine intake.


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