汽車空調製冷劑壓力感測器作用
Automotive Air Conditioner Pressure Sensor
現在的中高檔轎車，特別是使用自動空調的轎車通常採用壓力感測器來感測系統壓力，以測量壓力是否正常
它的結構相當於一個歧管壓力感測器，一般為壓敏電阻式。其結構如圖所示
空調壓力感測器位於製冷劑管路高壓側的製冷劑壓力感測器對製冷系統起到保護作用，防止壓力過高或過低對其造成損壞。如果系統內的壓力超過或低於規定值，製冷劑壓力感測器就會檢測製冷劑管路內的壓力，並向ECU發送電壓信號。當製冷劉壓力感測器檢測到高壓側的壓力高於2746 kPa或低於134 kPa時，ECU會使繼電器關閉，並停止壓縮機工作。壓力感測器除用於壓力控制外，還作為冷卻風扇的控制信號，當檢測到製冷劑壓力高於1.7 kP時，冷凝器散熱風扇將高速運轉。
Nowadays, mid-range and high-end cars, especially those with automatic air conditioning, usually use a pressure sensor to sense the system pressure and to measure whether the pressure is normal.
It is the equivalent of a manifold pressure sensor and is generally of the pressure sensitive resistive type. The structure is shown in the diagram
The air conditioning pressure sensor is located on the high pressure side of the refrigerant line to protect the refrigeration system from damage caused by too high or too low pressure. If the pressure in the system exceeds or falls below the specified value, the refrigerant pressure sensor detects the pressure in the refrigerant line and sends a voltage signal to the ECU. When the refrigerant pressure sensor detects that the pressure on the high side is above 2746 kPa or below 134 kPa, the ECU will shut down the relay and stop the compressor. The pressure sensor is used not only for pressure control, but also as a control signal for the cooling fan, which operates at high speed when the refrigerant pressure is detected above 1.7 kP.
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