With the development of automotive decoder electronic technology, the degree of automotive electronic interference engineering continues to improve, the usual mechanical system has been difficult to solve some of the car function requirements related to the decoding problem, but replaced by electronic control system. The function of the sensor is to quantitatively provide Sensor the components of the useful electrical output signal, that is, the transducer to convert the physical and chemical quantities of light, time, electricity, temperature, pressure and gas into the signal converter according to the specified measured size. Sensors as a key component of the automotive electronic control system, it directly affects the technical performance of the car. Ordinary cars are equipped with about 10-20 sensors, high-level luxury cars are more, these sensors are mainly distributed in the engine control system, chassis control system and body control system.
There are many types of engine control sensors, including temperature sensors, pressure sensors, speed and angle sensors, flow sensors, position sensors, gas concentration sensors, knock sensors and so on. This type of sensor is the core of the entire engine, which can improve engine power, reduce fuel consumption, reduce emissions, reflect the fault, etc., because of its work in the engine vibration, gasoline steam, sludge and mud and other harsh environments, Environmental technical indicators to be higher than the average sensor. There are many requirements fuel metering valve for their performance indicators, the most critical of which is the measurement accuracy and reliability, otherwise the error caused by the sensor detection will eventually lead to engine control system failure or failure.
Chassis control sensor is distributed in the transmission control system, suspension control system, power steering system, anti-lock system in the sensor, the role of different systems in different systems, but the working principle and the sensor is the same, The following forms of sensors:
1. Transmission control sensor: used for electronic control automatic transmission control. It is based on the speed sensor, acceleration sensor, engine load sensor, engine speed sensor, water temperature sensor, oil temperature sensor detection of the information obtained Pressure Sensor by the electronic control device control shift point and torque converter lock, to achieve maximum power And maximum fuel economy.
2. Suspension system control sensor: the main speed sensor, throttle opening sensor, acceleration sensor, body height sensor, steering wheel angle sensor. According to the detected information automatically adjust the vehicle height, inhibit the vehicle posture changes, to achieve the vehicle comfort, handling stability and driving stability control.
3. Power Steering System Sensor: It is based on the vehicle speed sensor, engine speed sensor, torque sensor and so on to the power steering control system to achieve steering light operation, improve response characteristics, reduce engine wear and tear, increase output power, save fuel and so on.
4. Anti-lock brake sensor: It is based on the wheel angular velocity sensor, the detection of wheel speed, the wheel slip rate of 20%, the control of brake oil pressure, improve braking performance, to ensure vehicle handling and stability The
The main purpose of using the sensor for body control is to improve the safety, reliability and comfort of the vehicle. There are many kinds of temperature sensors, air volume sensors, sunshine sensors and ABS Sensor so on in the automatic air conditioning system. The acceleration sensor in the airbag system, Automatic control of the light sensor; dead alarm system in the ultrasonic sensor; image sensors.
As the sensor in the electronic control system in the important role, so the world of its theoretical research, new material applications, product development are very seriously. Diamond heat resistance is good, high thermal stability, in the vacuum above 1200 ℃ began to appear on the surface of carbonization in the atmosphere but also in the above 600 ℃ began to carbonization, the use of this feature, the production of high temperature for the thermal sensor , From the normal temperature to 600 ℃ within the temperature monitoring and control, and for high temperature and corrosive gases in harsh environments, stable performance, long life, can be used for high temperature measurement Throttle Position Sensor of the engine. In addition, diamond deformation rate at high temperatures is very high, the use of this feature can be used in high temperature environment, the use of vibration sensors and acceleration sensors. Combined with other materials, the diaphragm can be used as a high temperature, corrosion resistance, high sensitivity pressure sensor for vibration detection and engine cylinder pressure and other measurements.
Optical fiber sensor due to strong anti-interference, high sensitivity, light weight, small size, suitable for telemetry and other characteristics are being widely accepted. There are many mature products come out, such as fiber torque sensor, temperature, vibration, pressure, flow and other sensors.
In the development and utilization of new materials at the same time, due to microelectronics technology and micro-machining technology development, the sensor is miniaturization, multi-functional, intelligent direction. The miniaturized sensor utilizes micromechanical processing technology to integrate micron-sized sensitive components, signal conditioner, and data processing devices into a single chip. Because of the small size, low cost, easy integration and other characteristics, can improve the system test accuracy, such as the micro-pressure sensor and micro-temperature sensor integrated together, while measuring the pressure and temperature, through the chip operation to eliminate the pressure measurement temperature influences. There have been many micro-sensors available, such as pressure sensors, acceleration sensors, for the collision Pressure Switch of silicon acceleration sensors. In the car tire embedded micro-pressure sensor can maintain proper inflation, to avoid excessive or insufficient inflation, thus saving fuel 10%. The versatility allows the sensor to simultaneously detect two or more characteristic parameters. The smart sensor with a dedicated computer, which has intelligent features.