Importance

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Abstract

In an air conditioning apparatus for a vehicle, an amount of hot water flowing from an engine into a heater core is adjusted by a flow control valve so that temperature of air blown from the heater core is adjusted. A water pump driven by the engine is disposed in a water circuit so that hot water circulates between the engine and the heater core. The flow control valve includes a bypass passage through which hot water bypasses the heater core and a pressure response valve for adjusting an opening degree of the bypass passage. An opening degree of the flow control valve is controlled by a control unit so that the amount of hot water flowing into the heater core is adjusted. In the air conditioning apparatus, the opening degree of the flow control valve is corrected by the control unit to reduce variation in the amount of hot water flowing into the heater core due to variation in a rotation speed of the engine. Thus, variation in temperature of air blown from the heater core due to the variation in the rotation speed of the engine can be reduced.

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First Claim