MANUAL AIR CONDITIONER SYSTEM [MANUAL AIR CONDITIONER (E)]

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Outline

•  The manual air conditioner system compares the operation signal from the climate control unit and the target temperature calculated by the dash-electrical supply unit, and the dash-electrical supply unit performs the following controls based on the results.
―  Airflow temperature control
―  Airflow volume control
―  Airflow mode control
―  Air intake control
―  A/C compressor control
―  Air conditioner i-stop control

Function

Target temperature determination
•  The dash-electrical supply unit calculates the target temperature (temperature for maintaining set temperature in a stable condition) based on the input signal from each sensor and the climate control unit airflow mode setting signal/temperature setting signal.
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•  The dash-electrical supply unit determines the optimum air conditioning conditions based on the calculated target temperature and climate control unit setting operation signal, and controls each actuator, A/C compressor, and blower motor.
Windshield fogging determination (with humidity sensor)
•  The dash-electrical supply unit adds the correction value calculated from each signal to the signal from the humidity sensor and determines the level of windshield fogging.
•  The dash-electrical supply unit dehumidifies the air around the windshield (interior) and removes fogging from the windshield by changing the settings (airflow mode control, air intake control, A/C compressor control) of each control according to the level of windshield fogging.
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Airflow temperature control

•  The airflow temperature control operates the air mix actuator and switches the air mix door position in conjunction with the airflow temperature setting and the vehicle conditions.


Airflow volume control

•  The airflow volume control changes the blower motor operation and switches the airflow volume in conjunction with the airflow volume setting and the vehicle conditions.


Airflow mode control

•  The airflow mode control operates the mode actuator and switches the position of the airflow mode door in conjunction with the airflow mode setting and the vehicle conditions.


Air intake control

•  The air intake control operates the air intake actuator and switches the air intake door position in conjunction with the air intake setting and the vehicle conditions.


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

•  The dash-electrical supply unit determines i-stop control (engine stop control) according to the operation conditions of the air conditioner system, and sends i-stop (engine stop control) request signals to the PCM.
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•  During i-stop operation (engine stop control), the dash-electrical supply unit controls the airflow temperature by operating the air mix actuator to perform correction for the temperature decrease of the engine coolant or the temperature increase of the air passing through the evaporator.
Caution
•  Occupants may hear the operation sound of the air mix actuator because there is no engine sound during the i-stop operation (engine stop control). The airflow temperature control is performed even during i-stop operation (engine stop control), therefore, it does not indicate a system malfunction even if the operation sound of the air mix actuator is heard.


Structure/construction


Block diagram

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System wiring diagram

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Structural view (interior L.H.D.)

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Structural view (interior R.H.D.)

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Structural view (exterior)

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Operation


Airflow temperature control

1.  When the airflow temperature setting dial is operated with the ignition switched ON (engine off or on), the climate control unit sends an airflow temperature setting signal (1) to the dash-electrical supply unit.

2.  Based on the signals (2) from each sensor which changes according to the airflow temperature setting and the vehicle conditions, the dash-electrical supply unit performs airflow temperature determination (3).

3.  The dash-electrical supply unit operates (4) the air mix actuator based on the results of the airflow temperature determination and corrections.

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4.  The air mix actuator sends a potentiometer signal (5) to the dash-electrical supply unit.

5.  The dash-electrical supply unit detects the current actuator opening angle based on the potentiometer signal.

6.  When the potentiometer signal differs from the target actuator opening angle, the dash-electrical supply unit outputs a target position signal (6).

7.  When the potentiometer signal is equal to the target actuator opening angle, the dash-electrical supply unit stops (7) output of the target position signal.

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Airflow volume control

1.  When IG1 relay No.2 turns ON, the blower relay turns ON (1).

2.  When the airflow volume setting switch is operated, the climate control unit sends an airflow volume setting signal (2) to the dash-electrical supply unit.

3.  Based on the airflow volume setting and the signals (3) from each sensor, the dash-electrical supply unit performs airflow volume determination (4).

4.  The dash-electrical supply unit controls the blower fan controller (5) and changes the airflow volume (blower motor applied voltage) based on the results of the airflow volume determination and corrections.

5.  The blower motor (6) changes the rotation speed according to the blower fan controller control.

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Airflow mode control

1.  When the airflow mode switch is operated with the ignition switched ON (engine off or on), the climate control unit sends an airflow mode setting signal (1) to the dash-electrical supply unit.

2.  Based on the signals (2) from each sensor which changes according to the airflow mode setting and the vehicle conditions, the dash-electrical supply unit performs airflow mode determination (3).

3.  The dash-electrical supply unit operates (4) the airflow mode actuator based on the results of the airflow temperature determination and corrections.

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4.  The airflow mode actuator sends a potentiometer signal (5) to the dash-electrical supply unit.

5.  The dash-electrical supply unit detects the current actuator opening angle based on the potentiometer signal.

6.  When the potentiometer signal differs from the target actuator opening angle, the dash-electrical supply unit outputs a target position signal (6).

7.  When the potentiometer signal is equal to the target actuator opening angle, the dash-electrical supply unit stops (7) output of the target position signal.

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Air intake control

1.  When the air intake setting switch is operated with the ignition switched ON (engine off or on), the climate control unit sends an air intake setting signal (1) to the dash-electrical supply unit.

2.  Based on the signals (2) from each sensor which changes according to the air intake setting and the vehicle conditions, the dash-electrical supply unit performs air intake mode determination (3).

3.  The dash-electrical supply unit operates (4) the air intake actuator based on the results of the air intake mode determination and corrections.

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4.  The air intake actuator sends a potentiometer signal (5) to the dash-electrical supply unit.

5.  The dash-electrical supply unit detects the current actuator opening angle based on the potentiometer signal.

6.  When the potentiometer signal differs from the target actuator opening angle, the dash-electrical supply unit outputs a target position signal (6).

7.  When the potentiometer signal is equal to the target actuator opening angle, the dash-electrical supply unit stops (7) output of the target position signal.

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A/C compressor control

1.  Based on the signals (1) from each sensor which changes according to the A/C setting and the vehicle conditions, the dash-electrical supply unit performs A/C compressor mode determination (2).

2.  The dash-electrical supply unit sends (3) an A/C signal to the PCM based on the results of the A/C compressor mode determination and corrections.

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

i-stop request control (i-stop (engine stop control) permission)/i-stop (engine stop control) inhibit)
•  The dash-electrical supply unit sends an i-stop (engine stop control) permission request signal/i-stop (engine stop control) inhibit request signal to the PCM in conjunction with the operation conditions of the air conditioner system.
i-stop (engine stop control) inhibit request
•  The dash-electrical supply unit sends an i-stop (engine stop control) inhibit request signal to the PCM when it detects any of the following conditions.

Item

Condition
Ambient temperature
Ambient temperature is -10 °C {14 °F} or below, or 50 °C {122 °F} or more
Blower motor control
Blower motor is operated when speed is set to 1 or higher
Mode control
During manual defroster control
Temperature setting and compressor control
During MAX HOT or MAX COLD and A/C ON
Air conditioner control
Target temperature not controlled (comfortable cabin temperature not controlled)

i-stop (engine stop control) permission request
•  The dash-electrical supply unit sends an i-stop (engine stop control) permission request signal to the PCM when i-stop (engine stop control) inhibit request condition is not detected.