What is a car sensor

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It can transmit signals. According to the physical quantity of the sensor, it can be divided into displacement, force, speed, temperature, flow, gas composition and other sensors. According to the working principle of the sensor, it can be divided into resistance, capacitance, inductance, voltage, Hall, photoelectric, grating, thermocouple and other sensors. What are the sensors on the car: Air flow sensor The air flow sensor converts the inhaled air into an electrical signal and sends it to the electronic control unit (ECU) as one of the basic signals for fuel injection. According to different measurement principles, it can be divided into four types: rotary vane air flow sensor, Karman vortex air flow sensor, hot wire air flow sensor, and hot film air flow sensor. The first two are volume flow types, and the latter two are mass flow types. Mainly hot wire air flow sensor and hot film air flow sensor are used. What are the sensors on the car: Odometer sensor The sensor on the differential or half shaft senses the number of rotations. The odometer sensor generally uses Hall and photoelectric methods to detect signals. The purpose is to effectively analyze and judge the driving speed and mileage of the car by using the odometer count. Because the angular speed of the half shaft and the wheel is equal, the tire radius is known, and it is directly calculated through the mileage parameter. Two bearings are designed on the transmission shaft, which greatly reduces the torque during operation, reduces friction, and extends the service life; the original dynamic detection signal is changed to a gear operation detection signal; the original direct plug-in vertical gearbox is changed to a chamfered interface gearbox. The odometer sensor plug is generally on the gearbox. Some can be seen by opening the engine cover, and some need to be operated in the pit. What are the sensors on the car: Oil pressure sensor It refers to a micro-electromechanical system that integrates micro-sensors, actuators, signal processing and control circuits, interface circuits, communication and power supply. Commonly used are silicon piezoresistive and silicon capacitive, both of which are micro-electromechanical sensors generated on silicon wafers. Generally, we use the oil pressure sensor to detect how much oil is left in the car's oil inward, and convert the detected signal into a signal we can understand to remind us how much oil is left, or how far we can go, or even remind the car that it needs to add oil. What are the sensors on the car: Water temperature sensor Its interior is a semiconductor thermistor. The lower the temperature, the greater the resistance; conversely, the smaller the resistance. It is installed on the water jacket of the engine block or cylinder head and is in direct contact with the cooling water. Thus, the temperature of the engine cooling water is measured. The electronic control unit measures the temperature of the engine cooling water based on this change. The lower the temperature, the greater the resistance; conversely, the smaller the resistance. The electronic control unit measures the temperature of the engine cooling water based on this change as a correction signal for fuel injection and ignition timing. That is, we can understand the operating status of the car, whether it is stopped or moving, or how long it has been moving, through the temperature of the engine water temperature.