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When using a container with a water temperature sensor, the water level sensor inside the container converts the cooling water temperature into an electrical signal, and feeds back to the car's driving computer, at which time the ECU will adjust the control unit in time according to the data stored in advance and the feedback signal.
The water temperature sensor contains an NTC thermistor, which changes with the temperature of the cooling water, so that the corresponding water level signal can be measured more accurately. Then according to the deviation from the set signal, the ECU can make a judgment on the working condition of the engine in time, and then correct the fuel injection amount and ignition advance Angle of the car.
The function and use of water temperature sensor:
First, the role of the water temperature sensor:
1, modify the injection amount, increase the injection amount when low temperature.
2, modify the ignition advance Angle, increase the ignition advance Angle at low temperature, high temperature, in order to prevent deflagration, delay.
3, affect the idle speed control valve, low temperature ECU according to the water temperature sensing signal control idle speed control valve action, improve speed.
4. The EGR valve is affected.
Second, the use of water temperature sensor precautions:
The contact temperature sensor should strictly ensure that it works within the allowed range. If it works beyond the range for a long time, it will accelerate the aging of the lead skin of the temperature sensor, and if it is heavy, it will damage the chip.
Operating temperature overrun is an important reason for the short service life of temperature sensors. Beyond the range range, some sensors will not collect data, and some collected data will be biased.
operating principle
The water temperature sensor is: the NTC thermistor is packaged in the temperature sensor, and its resistance value changes with the change of temperature, so as to accurately and timely measure the change of the ambient temperature, determine its output resistance value, that is, reflect the temperature of the contact medium. It is used to monitor the coolant temperature of the engine, and make the ECU judge the working condition of the engine through the output resistance signal, and correct the fuel injection and ignition.