What are the temperature sensor temperature sensor automatic air conditioning system

Each car will have air conditioning, so it is now in hot summer, or in cold winter, only hide in the car, need not afraid of the heat and cold. Which and the temperature sensor is inseparable from, the automatic air conditioning system which contains in the temperature sensor temperature sensor?

temperature sensor automatic air conditioning system include: engine coolant temperature sensor, temperature sensor, temperature sensor, inside the car evaporator temperature sensor, solar radiation sensor, refrigerant temperature control switch, etc.

the control unit on the basis of the sensor signal to calculate the temperature needed for blowing air into the cabin, select the desired air quantity, and then the control air is mixed entrance, water valve, in and out of the port transfer board, etc. , within the scope of the pilot set the temperature automatically adjust the temperature of the cabin, to the best, and automatically control the opening and closing of air conditioning.

when the engine coolant temperature over 120 ℃ in order to protect the engine, to stop the air conditioning work. Air conditioning refrigerant in the compressor temperature is exorbitant, electromagnetic clutch temperature switch will cut off compressor circuit. Installed in the middle of the evaporator of the evaporator temperature sensor or temperature switch by controlling the air conditioning compressor operation to control the temperature of the evaporator.

the purpose of the evaporator temperature control, is to prevent the evaporator frosting. If the temperature of the evaporator is lower than 0 ℃, water will condense on the surface of the evaporator, frost or freeze, serious when congestion evaporator of the air passage, and lead to the cooling system refrigeration effect is significantly reduced.

in order to avoid the evaporator frosting, you must control the temperature of the evaporator in 0 ℃ or more. Evaporator temperature is too low, below the set point is below 0 ℃, will cut off the compressor air conditioning amplifier circuit of electromagnetic clutch. Evaporator outlet temperature sensor failure, will lead to air conditioning compressor clutch frequent absorption and separation. Expansion valve between the evaporator pipe frost, can lead to air conditioning air volume is small.

refrigeration air conditioning system is one of the conditions of the environment temperature is higher than indoor temperature, environment temperature sensor circuit, terminals, poor contact or bad earth, the water temperature - data flow display environment Below 30 ℃, will cause air conditioning not refrigeration. At the same time, the engine coolant temperature sensor circuit or ground contact undesirable, signal on time, cooling fan does not turn, lead to air conditioning cooling bad, will also enter the failure protection, let air conditioning to stop working.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor