MANUAL AIR CONDITIONER SYSTEM [MANUAL AIR CONDITIONER]

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Outline

Climate control unit with RECIRCULATE/FRESH lever type

•  The manual air conditioner system is controlled by the instrument cluster.

•  The instrument cluster performs the following controls based on the input signals from the each dial/switch and each sensor of the climate control unit.

―  A/C compressor control

―  Air conditioner i-stop control (With i-stop)

Climate control unit with RECIRCULATE/FRESH switch type

•  The climate control unit performs the following controls based on the input signals from the each dial/switch and each sensor.

―  Air intake control

―  A/C compressor control

―  Air conditioner i-stop control (With i-stop)

Function

•  The climate control unit perform the windshield fogging judgment based on the signal from the humidity sensor and applies the calculated correction value from the each signal.

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Air intake control (climate control unit with RECIRCULATE/FRESH switch type)

•  The air intake control operates the air intake actuator and switches the air intake door position according to the air intake setting.

A/C compressor control

•  The A/C compressor control sends the A/C signal to the PCM based on the climate control unit operation and signals from each sensor.

Air conditioner i-stop control (With i-stop)

•  The instrument cluster determines i-stop control (engine stop control) according to the operation condition of the air conditioner system and sends i-stop (engine stop control) request signals to the PCM.

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Block Diagram

Climate control unit with RECIRCULATE/FRESH lever type

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Climate control unit with RECIRCULATE/FRESH switch type

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System Wiring Diagram

Climate control unit with RECIRCULATE/FRESH lever type

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Climate control unit with RECIRCULATE/FRESH switch type

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Structural View

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Operation

Air intake control (mechanical lock type air intake actuator)

1.  The climate control unit performs air intake mode determination (2) based on the signals (1) from each sensor which change according to the operation of the RECIRCULATE switch and the FRESH switch and the vehicle conditions when the ignition is switched ON (engine off or on).

2.  The climate control unit drives (3) the air intake actuator for a specified time based on the results of the air intake mode determination and corrections.

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3.  When the air intake actuator moves to FRESH or REC, the motor locks (4).

4.  When the motor locks and is under excessive load, the current value flowing from the climate control unit increases more than the specification (lock current).

5.  When the lock current (5) is detected, the climate control unit stops the motor drive signal (6) to the air intake actuator.

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Air intake control (potentiometer type air intake actuator)

1.  The climate control unit performs air intake mode determination (2) based on the signals (1) from the air intake setting and the vehicle conditions when the ignition is switched ON (engine off or on).

2.  The climate control unit drives the air intake actuator (3) according to the result of the air intake mode determination and corrections.

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3.  The climate control unit detects the current air intake actuator opening angle based on the potentiometer voltage (4).

4.  The climate control unit compares (5) the target actuator voltage value with the voltage from the potentiometer.

5.  When the potentiometer voltage value differs from the target actuator voltage value, the climate control unit drives (6) the air intake actuator motor.

6.  When the potentiometer voltage value matches (7) the target actuator voltage value, the climate control unit stops (8) the air intake actuator motor.

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A/C compressor control (With RECIRCULATE/FRESH lever type climate control unit))

1.  The instrument cluster sends an A/C signal (2) to the PCM based on the signals (1) from each sensor which change according to the climate control unit A/C switch, airflow volume control dial, and the vehicle conditions.

2.  The PCM turns the A/C relay on (4) based on the signals (3) from each sensor which change according to the the A/C signal and the vehicle conditions.

3.  When the A/C relay turns on, the magnetic clutch turns on (5).

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A/C compressor control (With RECIRCULATE/FRESH switch type climate control unit)

1.  The climate control unit performs A/C compressor mode determination (2) based on the signals (1) from each sensor which change according to each switch/dial operation and the vehicle conditions when the ignition is switched ON (engine off or on).

2.  The climate control unit sends (3) the A/C signal to the PCM according to the result of the A/C compressor mode determination and corrections.

3.  The PCM turns the A/C relay on (4) based on the signals from each sensor which change according to the A/C signal and the vehicle conditions.

4.  When the A/C relay turns on, the magnetic clutch turns on (5).

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Air conditioner i-stop control (With i-stop)

i-stop request control (i-stop (engine stop control) permission)

•  The instrument cluster sends an i-stop (engine stop control) permission request signal to the PCM in conjunction with the operation conditions of the air conditioner system.

i-stop (engine stop control) permission request

•  The instrument cluster sends an i-stop (engine-stop control) permit signal to the PCM when it does not detect any of the following conditions:

i-stop (engine stop control) inhibit conditions