Sensor and control system for an automotive air conditioning system.

摘要

An air conditioning system including a refrigerant circulation route (21), a compressor (23), a condenser (24), an expansion valve (31), an evaporator (25) and a pressure sensor (30) for detecting pressure in the circulation route (21) comprises a refrigerant phase detecter (41, 51) provided on the circulation route (21) between the condenser (24) and the evaporator (25) where the refrigerant should be in a liquid phase for detecting whether the refrigerant is in a liquid phase or in a vapor phase and a control for determining whether the compressor (23) is in a locked state in accordance with the signals from the refrigerant phase detecter (41, 51) and the pressure sensor (30). The air conditioning system can precisely determine and detect both compressor lock up and refrigerant leakage without providing a rotation detecting sensor for the compressor (23).