MANUAL AIR CONDITIONER SYSTEM [MANUAL AIR CONDITIONER]

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Outline

―  Airflow volume control

―  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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Airflow volume control

•  The airflow volume control changes the operation of the blower motor according to the airflow volume setting to change the airflow volume.

Air intake control

•  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 climate control unit determines i-stop control according to the operation condition of the air conditioner system and sends i-stop request signals to the PCM.

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Construction

Block diagram

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System Wiring Diagram

7-speed type airflow volume control dial

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4-speed type airflow volume control dial

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Structural view

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Operation

Airflow volume control (7-speed type airflow volume control dial)

1.  When the ignition is switched ON (engine off or on), the front body control module (FBCM) turns the blower relay on (1).

2.  When the airflow volume setting on the climate control unit is turned on (2), the blower motor (3) rotates.

3.  The climate control unit performs airflow volume determination (5) based on the airflow volume setting and the signals from each sensor (4).

4.  Based on the result of the airflow volume determination and correction, the climate control unit control the blower fan controller (6) and changes the airflow volume (blower motor applied voltage).

5.  The rotation speed of the blower motor (7) changes according to the applied voltage from the blower fan controller.

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Airflow volume control (4-speed type airflow volume control dial)

1.  When the ignition is switched ON (engine off or on), the front body control module (FBCM) turns the blower relay on (1).

2.  When the airflow volume setting on the climate control unit is turned on (2), the blower motor (3) rotates.

3.  When a 3-speed or more setting on the airflow volume setting (4) is detected, the climate control unit sends a blower speed signal (5) to the PCM (6).

4.  The PCM controls the generator voltage according to electrical load conditions based on the blower speed signal from the climate control unit.

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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.

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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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 the air intake setting and the vehicle conditions.

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.  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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A/C compressor control

1.  The climate control unit performs A/C compressor mode determination (2) based on the signals (1) from each sensor which change according to A/C setting and the vehicle conditions.

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) permit)

•  The climate control unit sends i-stop (engine stop control) permit or inhibit request signals to the PCM according to the operation condition of the air conditioner system.

i-stop (engine stop control) inhibit request

•  The climate control unit 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