The vehicle sensor is an input device of the automobile computer system. It converts various working condition information such as vehicle speed, temperature of various media, engine operating conditions, etc. into electrical signals and transmits them to the computer, so that the engine is in the best condition. Working status. There are many sensors for vehicles. When judging the fault of the sensor, you should not only consider the sensor itself, but should consider the entire circuit in which the fault occurs. Therefore, when looking for a fault, in addition to checking the sensor, check the wiring harness, the connector, and the related circuit between the sensor and the electronic control unit.
Basic Features:
A sensor is a device or device that can sense a specified physical quantity and convert it into an available input signal according to a certain rule. Simply put, a sensor is a device that converts non-electricity into electricity.
The sensor usually consists of three parts: a sensitive component, a conversion component, and a measurement circuit.
1) A sensitive component is a component that can directly sense (or respond to) the measured component, ie, the sensitive component that is measured through the sensor is converted into a non-electrical quantity or other quantity that has a certain relationship with the measured.
2) The conversion component converts the above non-electric quantity into an electrical parameter.
3) The function of the measuring circuit is to convert the electrical parameters input by the converting component into measurable electric quantities such as voltage, current or frequency for display, recording, control and processing.
Classification:
There are three commonly used ones:
1.According to the physical quantity of the sensor, it can be divided into sensors such as displacement, force, speed, temperature, flow, gas composition, etc.
2. According to the working principle of the sensor, it can be divided into sensors such as resistors, capacitors, inductors, voltages, Halls, photoelectrics, gratings, and thermocouples.
3. According to the nature of the sensor output signal, it can be divided into: switch type sensor whose output is switch quantity ("1" and "0" or "on" and "off"); the output is analog type sensor; the output is pulse or code Digital sensor.
