AIRFLOW TEMPERATURE CONTROL [FULL-AUTO AIR CONDITIONER]
id0740a1310300
Purpose
• The airflow temperature control changes the airflow temperature according to the vehicle conditions.
Function
• The air mix actuator is driven and the air mix door position is changed according to the set temperature and the vehicle environment.
• The climate control unit calculates the air mix actuator opening angle characteristic based on the set temperature, solar radiation amount, and airflow mode.
• The air mix actuator opening angle characteristic is set lower as the sunlight intensity increases.
• The airflow temperature is automatically controlled continuously.
• The airflow temperature control performs the following corrections:
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― MAX HOT and MAX COLD correction
― Engine coolant temperature correction
MAX HOT and MAX COLD correction
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• Under the MAX HOT and MAX COLD correction, the air mix actuator opening angle is fixed at fully open when the temperature is set to 29.0/84, and fixed at fully closed when the temperature is set to 15/60. (European (L.H.D. U.K.) specs.).
• Under the MAX HOT and MAX COLD correction, the air mix actuator opening angle is fixed at fully open when the temperature is set to 32.0/90, and fixed at fully closed when the temperature is set to 18/64. (except European (L.H.D. U.K.) specs.).
Engine coolant temperature correction
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• The engine coolant temperature correction prevents cold air from coming out of the air vents after the engine is started in winter.
• When the engine coolant temperature is lower than the specified value, the air mix actuator opening angle is corrected to the HOT side.
• The engine coolant temperature correction is not performed when the ambient temperature is 15 °C {59 °F}or more.
Construction
• The airflow temperature control consists of the parts indicated in the following table:
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Input device
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Control part
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Output device
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• Temperature setting dial (climate control unit)
• Cabin temperature sensor
• Solar radiation sensor
• Ambient temperature sensor
• Evaporator temperature sensor
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• Climate control unit
• PCM
• Instrument cluster
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• Air mix actuator
• Air mix door
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Operation
1. The climate control unit determines the airflow temperature based on the temperature control dial operation and signals from each sensor which changes according to the vehicle environment.
2. The climate control unit drives the air mix actuator according to the results of the airflow temperature determination and corrections.
