Vehicle air conditioner
First Claim
1. An air conditioner for a vehicle having a compartment, the air conditioner comprising:
- an air conditioning duct through which air flows into the compartment;
a cooling heat exchanger, disposed in the air conditioning duct, for cooling and dehumidifying air in the air conditioning duct in accordance with operation of a compressor;
a temperature detection unit which detects a temperature of air cooled in the cooling heat exchanger;
a humidity detection unit which detects a humidity of air passing a ventilation passage through which air inside the compartment is ventilated in accordance with an air flow amount in the air conditioning duct; and
a controller which controls the compressor so that the temperature detected by the temperature detection unit approaches a target cooling temperature, wherein;
when the air flow amount in the air conditioning duct is equal to or larger than a predetermined amount, the controller calculates the target cooling temperature of air to be cooled by the cooling heat exchanger, for defogging a windshield of the vehicle, based on the humidity detected by the humidity detection unit; and
when the air flow amount in the air conditioning duct is lower than the predetermined amount, the controller calculates the target cooling temperature for defogging the windshield based on a set humidity higher than the humidity detected by the humidity detection unit.
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Accused Products
Abstract
In a vehicle air conditioner, a controller calculates a first target post-evaporator temperature for defogging a windshield based on a detection humidity of a humidity sensor, and calculates a second target post-evaporator temperature for defogging the windshield regardless of the detection humidity of the humidity sensor. Then, the controller determines a smaller one between the first and second target post-evaporator temperatures, as a target post-evaporator temperature. Accordingly, even when the humidity sensor detects a humidity lower than an actual humidity of a passenger compartment when a blower operates by a low air-blowing amount, a windshield is prevented from fogging.
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Citations
11 Claims
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1. An air conditioner for a vehicle having a compartment, the air conditioner comprising:
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an air conditioning duct through which air flows into the compartment;
a cooling heat exchanger, disposed in the air conditioning duct, for cooling and dehumidifying air in the air conditioning duct in accordance with operation of a compressor;
a temperature detection unit which detects a temperature of air cooled in the cooling heat exchanger;
a humidity detection unit which detects a humidity of air passing a ventilation passage through which air inside the compartment is ventilated in accordance with an air flow amount in the air conditioning duct; and
a controller which controls the compressor so that the temperature detected by the temperature detection unit approaches a target cooling temperature, wherein;
when the air flow amount in the air conditioning duct is equal to or larger than a predetermined amount, the controller calculates the target cooling temperature of air to be cooled by the cooling heat exchanger, for defogging a windshield of the vehicle, based on the humidity detected by the humidity detection unit; and
when the air flow amount in the air conditioning duct is lower than the predetermined amount, the controller calculates the target cooling temperature for defogging the windshield based on a set humidity higher than the humidity detected by the humidity detection unit. - View Dependent Claims (2, 3, 4, 5)
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6. An air conditioner for a vehicle having a compartment, the air conditioner comprising:
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an air conditioning duct through which air flows into the compartment;
a cooling heat exchanger, disposed in the air conditioning duct, for cooling and dehumidifying air in the air conditioning duct in accordance with operation of a compressor;
a temperature detection unit which detects a temperature of air cooled in the cooling heat exchanger;
a humidity detection unit which detects a humidity of air passing a ventilation passage through which air inside the compartment is ventilated in accordance with an air flow amount in the air conditioning duct; and
a controller which controls the compressor such that the temperature detected by the temperature detecting unit becomes a target cooling temperature, wherein;
the controller calculates a first temperature for performing a defogging of a windshield of the vehicle based on the humidity detected by the humidity detection unit, and calculates a second temperature for performing the defogging of the windshield regardless of the humidity detected by the humidity detection unit; and
the controller determines a lower one between the first temperature and the second temperature, as the target cooling temperature. - View Dependent Claims (7, 8, 9, 10)
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11. An air conditioner for a vehicle having a compartment, the air conditioner comprising:
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an air conditioning duct through which air flows into the compartment;
a cooling heat exchanger, disposed in the air conditioning duct, for cooling and dehumidifying air in the air conditioning duct in accordance with operation of a compressor;
a temperature detection unit which detects a temperature of air cooled in the cooling heat exchanger;
a humidity detection unit which detects an air humidity relating to a humidity of the compartment; and
a controller which controls the compressor such that the temperature detected by the temperature detecting unit becomes a target cooling temperature, wherein;
the controller calculates a first temperature for performing a defogging of a windshield of the vehicle based on the humidity detected by the humidity detection unit, and calculates a second temperature for performing the defogging of the windshield regardless of the humidity detected by the humidity detection unit; and
the controller determines a lower one between the first temperature and the second temperature, as the target cooling temperature.
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Specification