MANUAL AIR CONDITIONER CONTROL SYSTEM [MANUAL AIR CONDITIONER]
id0740a2101000
Outline
• The climate control unit performs the following controls based on the signals from each switch/dial and the sensor.
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― A/C compressor control
― Defroster control
― i-stop control
Block Diagram
Outline of Control System
• Manual air conditioner has the following control.
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Control name
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Control part
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• A/C compressor control
• Defroster control
• i-stop control
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Climate control unit
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A/C Compressor Control
• The climate control unit sends the A/C signal to the PCM based on the signals sent from the A/C switch, airflow volume control dial, and evaporator temperature sensor.
• The PCM turns the A/C relay on/off based on the input signals from the A/C signal and A/C pressure sensor and controls the A/C compressor (magnetic clutch) operation.
A/C signal on/off control
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• When the A/C switch and fan switch are turned on, the climate control unit turns the A/C signal (magnetic clutch) on/off based on the temperature of the air passing through the evaporator.
• When the fan switch and A/C switch are turned on, the climate control unit controls the surface temperature of the evaporator so that it is within a certain range to prevent the evaporator from freezing.
• When the ambient temperature is low, the climate control unit sets the A/C signal (magnetic clutch) off-temperature to low to prevent window fogging.
Defroster control
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• The defroster control improves the defrosting effect.
• When the defroster switch turns on, the climate control unit fixes the air intake mode to FRESH.
• The air intake is fixed at FRESH even if it has been set to REC manually.
