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Air conditioner for vehicle

  • US 9,511,647 B2
  • Filed: 09/01/2010
  • Issued: 12/06/2016
  • Est. Priority Date: 09/03/2009
  • Status: Active Grant
First Claim
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1. An air conditioner for a hybrid vehicle with an engine mounted to the hybrid vehicle, the air conditioner comprising:

  • a first heater disposed in a thermal fluid circulation circuit in which a thermal fluid heated by exhaust heat of the engine circulates, and configured to heat air to be blown into a vehicle compartment by using the thermal fluid as a heat source;

    a second heater disposed downstream of the first heater in a flow direction of the air to be blown into the vehicle compartment, and adapted as an auxiliary heater to further heat the air heated by the first heater;

    a first heating capacity control portion controlling a heating capacity of the first heater; and

    a second heating capacity control portion controlling a heating capacity of the second heater, whereinthe first heating capacity control portion controls the heating capacity of the first heater such that a temperature of the engine approaches a predetermined temperature regardless of an operation state of the engine when the thermal fluid after passing through the first heater returns to the engine,the second heating capacity control portion controls the heating capacity of the second heater such that temperature of the air to be blown into the vehicle compartment becomes a desired temperature,the thermal fluid circulation circuit is provided with a radiator radiating heat of the thermal fluid, and a thermostat valve operated at an operating temperature to cause the thermal fluid to pass through the radiator or to bypass the radiator,the predetermined temperature is lower than the operating temperature of the thermostat valve,the first heater is disposed in the thermal fluid circulation circuit to heat air by performing heat exchange between the thermal fluid and air, andthe second heater is a refrigerant condenser of a refrigerant cycle in which refrigerant discharged from a compressor flows into the second heater to heat the air passing through the second heater.

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