What are the functions of throttle position sensor and temperature sensor of EFI vehicle?

Temperature is a basic physical quantity, and all processes in nature are closely related to temperature. Temperature sensor is the earliest developed and most widely used sensor. The market share of temperature sensor greatly exceeds that of other sensors. Since17th century, people began to use temperature to measure. With the support of semiconductor technology, semiconductor thermocouple sensor, PN junction temperature sensor and integrated temperature sensor have been developed in this century. Based on this, according to the interaction law between wave and matter, acoustic temperature sensor, infrared sensor and microwave sensor have been developed successively.

If two conductors of different materials are connected to each other at a certain point, if this connection point is heated, then there will be a potential difference in their unheated parts. The value of this potential difference is related to the temperature of the measuring point in the unheated part and the materials of the two conductors. This phenomenon can occur in a wide temperature range. If the potential difference is accurately measured and then the ambient temperature of the unheated part is measured, the temperature of the heating point can be accurately known. Because it must have two conductors of different materials, it is called a thermocouple. Thermocouples of different materials are used in different temperature ranges, and their sensitivity is also different. The sensitivity of thermocouple refers to the change of output potential difference when the heating point temperature changes by 65438 0℃. For most thermocouples supported by metal materials, this value is about 5 ~ 40 microvolts/℃.

Crankshaft position sensor (CPS), also known as engine speed and crankshaft angle sensor, is used to collect crankshaft angle and engine speed signals and input them into electronic control unit (ECu) to determine ignition time and fuel injection time.

Camshaft position sensor (CPS) is also called cylinder recognition sensor (CIS). In order to distinguish it from the crankshaft position sensor (CPS), the camshaft position sensor is generally represented by CIS. The function of camshaft position sensor is to collect the position signal of valve camshaft and input it to ECU, so that ECU can identify the compression top dead center of 1 cylinder, and then carry out sequential fuel injection control, ignition timing control and deflagration control. In addition, the camshaft position signal is also used to identify the first ignition time when the engine is started. Because the camshaft position sensor can identify which cylinder piston is about to reach the top dead center, it is called cylinder identification sensor.