A vehicle air conditioning control apparatus having an externally controlled type compressor 3 and an externally controlled type cooling electric fan 9 is disclosed in which a control map, for determining a duty ratio for a fan motor 10 in terms of a compr...

The climate control for a motor vehicle has a compressor (12) with an evaporator (10) upstream of it. There is a heating heat exchanger (9) with a temperature regulator (20) and a control valve (7,23) for a hot water circuit from the engine cooling circuit...

A cooling fan which cools both an engine coolant radiator and an air conditioner refrigerant condenser is revolved by a motor whose duty ratio is controlled so that the sum (T1) of the torque (Ti1) required for a generator to drive the motor and the torque...

The need for a sensor to measure the temperature of the air stream that has passed through the evaporator is avoided by using, to evaluate this temperature, the current supplying a control valve incorporated into the compressor, in combination with various...

An air-conditioning system capable of always effectively performing the heating function by selectively using one of a cooling circuit and a heating circuit sharing a variable displacement type compressor is disclosed. An electromagnetic capacity control v...

Temperature of air flowing into a passenger compartment is determined by a sensor (4). Theoretical temperature value corresponding to detected air temperature, is defined for at least one value of an electrical control signal controlling a variable through...

An air-conditioning system with a refrigerant circulation circuit, which has improved control precision for maintaining a compartment temperature and improved response characteristics. The refrigerant circulation circuit includes a variable displacement ty...

An air conditioner having a refrigerant circuit that maintains a high cooling efficiency and a sufficient amount of oil returned to a compressor even if the flow rate of refrigerant is decreased due to a low cooling load is provided. The refrigerant circui...

The system comprises: a pressure sensor (P) for providing a signal indicative of the pressure of the refrigerant fluid of the air-conditioning system (A) at the output or delivery of the compressor (CP) of the system, a sensor (T) for detecting the tempera...