With the development of automotive air conditioning from manual to fully automated, only through the protection switch through, off two states, has been unable to meet the control needs of automotive air conditioning. In order Sensor to achieve accurate control of the comfort conditions on the car, as well as the effective protection of automotive air conditioning components, the need for refrigerant pressure, evaporator surface temperature, interior temperature, ambient temperature and other parameters for real-time monitoring, so all kinds of sensors in the car Air conditioning has been widely used.
At present, the sensors used in automatic air conditioning are mainly evaporator temperature sensor, air conditioning pressure sensor, outdoor temperature sensor, indoor temperature sensor, sunshine photoelectric sensor and coolant temperature sensor, some car air conditioning and humidity sensor and air quality sensor. These sensors will monitor the real-time signal sent to the car air conditioning control unit, and then by the car air conditioning control unit control related actuators (such as air conditioning compressors, blowers, cooling fans Suction Control Valve and the throttle, etc.) work, so the car comfort conditions (car Internal temperature, air volume and outlet mode) for precise control and to ensure safe operation of automotive air conditioning.
The evaporator temperature sensor is installed between the evaporator cooling blades instead of the temperature control switch for real-time monitoring of the evaporator surface temperature and prevents the evaporator from freezing due to the low surface temperature. The air conditioning pressure sensor is installed in the high pressure pipeline of the refrigeration system instead of the high, medium and low voltage switch, so as to monitor the pressure of the refrigerant in the high pressure pipeline of the refrigeration system in real time, thus protecting the refrigeration system components. The indoor temperature sensor is installed in the instrument panel near the steering wheel, and is used to monitor the temperature inside the vehicle in real time. The air conditioning control unit automatically adjusts the blower speed and outlet mode according to the temperature fuel metering valve difference between the temperature of the vehicle and the set temperature. The sunshine photoelectric sensor is installed on the instrument panel under the front windshield and is used to monitor the intensity of the sunlight in the vehicle in real time. The air conditioning control unit corrects the blower speed according to the signal. The coolant temperature sensor is installed at the coolant outlet on the engine cylinder head, not only to provide the coolant temperature signal to the engine control unit, to adjust the fuel injection quantity and the ignition advance angle, but also to provide the coolant temperature signal to the air conditioning control unit, In the cut off the air conditioning compressor working circuit, or the cooling fan high-speed operation, can replace the coolant temperature switch.
The air quality sensor is installed in the front of the vehicle and monitors the ambient air quality in real time during the car's running. When the car travel to the air pollution is more serious areas, such as encountered traffic jams, into the tunnel, air conditioning control unit will automatically turn off the air conditioning air intake dam, the car air circulation system from outside the cycle to internal circulation, to avoid Contaminated ABS Sensor air sucked into the car, and when the outside air becomes fresh, you can automatically open the air intake of the intake damper to inhale fresh air.