Quick Response Air Conditioning In Car Temperature Sensor 2k Ohm 3914

Quick Response Auto Air-conditioning In-car Temperature Sensor 2k Ohm 3914

Working Principle Of The In-car Temperature Sensor 2k Ohm 3914

The working principle of the outside temperature sensor is the same as that of the inside temperature sensor.
Sensors outside the car are generally installed in the front bumper or before the radiator, and are easily affected by the environment, so they are wrapped in an injection-molded resin case to avoid responding to sudden changes in temperature. This will enable it to accurately detect the average temperature outside the car. In addition, some models have anti-fake input circuits inside the air-conditioning computer

Input element of automatic air conditioner

①The temperature sensor inside and outside the car: It is a negative temperature coefficient thermistor sensor, used to sense the temperature inside and outside the car. When the temperature changes, the resistance changes, and the temperature signal is sent to the air-conditioning electronic control unit ECU.
②Evaporator temperature sensor: It detects the temperature of the air passing through the evaporator or the temperature change on the surface of the evaporator, and controls the coupling or disconnection of the electromagnetic clutch of the compressor. The signal is sent to the electronic control unit (ECU) to control the fan speed at low temperatures.

Features Of The In-car Temperature Sensor 2k Ohm 3914

【Application description】Measure the temperature change of the air conditioner;
[Assembly method] The wiring harness is tied and fixed.

● The temperature control response speed is fast.

● Good moisture and water resistance.

● The assembly method is simple and firm.

CWF202F3914FD400BC Specification

Series Parameters Of The In-car Temperature Sensor 2k Ohm 3914

Water temperature sensor function 

①Measure the temperature of the heat exchanger core and correct the position of the mixing door. Some models use
The engine water temperature sensor is replaced.
②Protection function to prevent the compressor from working under high temperature. Some models adopt
Use engine water temperature sensor instead, some models use water temperature switch instead.

③Control the fan. When the water temperature is too low, the system will start the fan preheating control. also
That is, when the water temperature is too low, and in heating conditions, in order to prevent the blowing wind from being cold, when the water temperature is lower than the set temperature of the system, the wind machine will work at low speed or not work. Some models use engine water temperature sensors instead, and some models use water temperature switches instead. 

Evaporator temperature sensor function

The FAW-Toyota Corolla automatic air conditioner is equipped with an evaporator temperature sensor, and some automatic air conditioners are not installed. The evaporator temperature sensor is used to measure the surface temperature of the evaporator, correct the position of the mixing door, and control the compressor. When the surface temperature of the evaporator is lower than a certain value, the compressor will not work and prevent frost on the evaporator surface.
Note: Some models have two evaporator temperature sensors, one of which is used to correct the position of the mixing door, and the other is used to prevent the evaporator from frosting