FULL-AUTO AIR CONDITIONER SYSTEM [FULL-AUTO AIR CONDITIONER]

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Outline

•  In the full-auto air conditioner system, the heat pump control unit and the dash-electrical supply unit perform the following controls based on the operation signal from the heater control unit and the input signal from each sensor.
Heat pump control unit
―  Airflow temperature control
―  Airflow volume control
―  Airflow mode control
―  Air intake control
―  Electric compressor control
―  Heat pump system control
―  PTC heater control
―  ECO mode control
Dash-electrical supply unit
―  Heated steering wheel control (With heated steering wheel)
―  Seat warmer control (With seat warmer)
•  A cabin preconditioning system has been adopted which can operate the climate control system and defog the windshield before driving. This system operates the climate control system while charging the battery before driving to reduce power consumption during driving. The cabin preconditioning has the following controls.
―  Climate control timer control
―  Control for remote climate control (when Connected Service is enabled)

Function

Target temperature determination
•  The heat pump control unit calculates the target temperature based on the input signal from each sensor and the heater control unit airflow mode setting signal/temperature setting signal/air intake setting signal.
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•  The heat pump control unit determines the optimum air conditioning conditions based on the target temperature and climate control unit setting operation signal, and controls each actuator, the electric compressor, and the blower motor.
Windshield fogging judgment
•  The heat pump control unit adds the correction value calculated from each signal to the signal from the humidity sensor and determines the level of windshield fogging.
•  The heat pump control unit dehumidifies the air around the windshield (interior) and defogs the windshield by changing the settings of each control (airflow mode control, air intake control, electric compressor control, PTC heater control) according to the level of windshield fogging and the climate control operation mode.
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Airflow temperature control

•  The airflow temperature control operates the electric compressor and the PTC heater and switches the air mix door position according to 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.


Electric compressor control

•  The electric compressor control sends an the electric compressor speed command signal to the PCM based on the heater control unit operation and signal from each sensor.


Heat pump system control

•  The heat pump system operates the 2way valve for refrigerant and the 3way valve for refrigerant and switches the refrigerant flow passage to control the refrigerant cycle.
•  The heat pump system refrigerant cycle has the following control modes.
―  Cooling control
―  Heating control
―  Defrosting control
The defrosting control is a function to melt the frost when frost is formed on the condenser.


PTC heater control

•  The PTC heater control sends a PTC heater operation signal to the PCM based on the climate control unit operation and signal from each sensor.


ECO mode control

•  When the ECO mode is set, the heat pump control unit performs control suppressing the power consumption by the climate control system.


Heated steering wheel control (With heated steering wheel)

Manual mode
•  The dash-electrical supply unit outputs the operation signal according to the climate control unit setting.
Auto mode
•  The dash-electrical supply unit controls the heated steering wheel automatically when the link seat & climate control temperatures is enabled and the climate control unit auto setting is on.
•  During auto control, the dash-electrical supply unit outputs an operation signal according to the temperature setting and the vehicle conditions.
•  For the enable/disable operation of the link seat & climate control temperatures, refer to the [PERSONALIZATION FEATURES] in the workshop manual.


Seat warmer control (With seat warmer)

Manual mode
•  The dash-electrical supply unit outputs the operation signal according to the climate control unit setting.
Auto mode
•  The dash-electrical supply unit controls the seat warmer automatically when the link seat & climate control temperatures is enabled and the climate control unit auto setting is on.
•  During auto control, the dash-electrical supply unit outputs an operation signal according to the temperature setting and the vehicle conditions.
•  For the enable/disable operation of the link seat & climate control temperatures, refer to the [PERSONALIZATION FEATURES] in the workshop manual.


Climate control timer control

•  By setting the departure time on the center display, the climate control operates by the departure time to improve comfortability and facilitate defrosting and defogging of the window glass.
•  When the climate control timer is set and the climate control timer reaches the start time, the heat pump control unit performs climate control according to the settings made.


Control for remote climate control (when Connected Service is enabled)

•  The climate control can be remotely operated by using a Smartphone before departure.
•  When the remote climate control is set, the heat pump control unit performs climate control according to the settings made.


Structure/construction


Block Diagram

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System wiring diagram

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Structural view

L.H.D.

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R.H.D.

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Structural view (L.H.D.)

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Structural view (R.H.D.)

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Operation


Airflow temperature control

1.  When the airflow temperature setting is operated with the main power switched ON (Ready on), the climate control unit sends an airflow temperature setting signal (1) to the heat pump control unit.

2.  Based on the signals (2) from each sensor which changes according to the airflow temperature setting and the vehicle conditions, the heat pump control unit performs airflow temperature determination (3).

3.  The heat pump control unit sends an electric compressor speed command signal and a PTC heater operation signal to the PCM, and sends an air mix actuator operation request signal (4) to the dash-electrical supply unit, based on the airflow temperature determination results and corrections

For the operation of the electric compressor and the PTC heater, refer to the [Electric compressor control] and [PTC heater control]

4.  The dash-electrical supply unit receives the air mix actuator operation request signal from the heat pump control unit and sends an air mix actuator operation signal (5) to the air mix actuator.

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Airflow volume control

1.  When the main power is switched ON (READY off or on), the body control module (BCM) turns the blower relay on (1), and the blower motor goes on operation standby.

2.  When the airflow volume setting is operated, the climate control unit sends an airflow volume setting signal (2) to the heat pump control unit.

3.  Based on the airflow volume setting and the signals (3) from each sensor, the heat pump control unit performs airflow volume determination (4).

4.  The heat pump control unit sends a blower speed signal (5) to the dash-electrical supply unit based on the airflow volume determination results and corrections.

5.  The dash-electrical supply unit receives the blower speed signal from the heat pump control unit and sends a blower motor operation signal (6) to the blower fan controller.

6.  The blower motor changes the rotation speed according to the blower fan controller (7) control.

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Airflow mode control

1.  When the airflow mode setting is operated with the main power switched ON (Ready off or on), the climate control unit sends an airflow mode setting signal (1) to the heat pump control unit.

2.  Based on the airflow mode setting and the signals (2) from each sensor which changes according to the vehicle conditions, the heat pump control unit performs airflow mode determination (3).

3.  The heat pump control unit sends a mode actuator operation request signal (4) to the dash-electrical supply unit based on the airflow mode determination results and corrections.

4.  The dash-electrical supply unit receives the mode actuator operation request signal from the heat pump control unit and sends a mode actuator operation signal (5) to the mode actuator.

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Air intake control

1.  When the air intake setting is operated with the main power switched ON (Ready 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 vehicle conditions, the heat pump control unit performs air intake mode determination (3).

3.  The heat pump control unit sends an air intake actuator operation request signal (4) to the dash-electrical supply unit based on the air intake mode determination results and corrections.

4.  The dash-electrical supply unit receives the air intake actuator operation request signal from the heat pump control unit and sends an air intake actuator operation signal (5) to the air intake actuator.

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Electric compressor control

1.  Based on the signals (1) from each sensor which changes according to the target temperature, the climate control setting, and the vehicle conditions, the heat pump control unit performs electric compressor mode determination (2).

2.  The heat pump control unit sends (3) an electric compressor speed command signal to the PCM according to the electric compressor mode determination results and corrections.

3.  The PCM operates the electric compressor based on the electric compressor speed command signal from the heat pump control unit.

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Heat pump system control

•  The 2way valve for refrigerant and 3way valve for refrigerant are controlled according to each refrigerant control mode as indicated in the following table.

Refrigerant control mode

2way valve for refrigerant

3way valve for refrigerant
Cooling control
OFF (OPEN)
ON (accumulator side: OPEN)
Heating control
ON (CLOSED)
OFF (electric expansion valve side: OPEN)
Defrosting control
OFF (OPEN)
OFF (electric expansion valve side: OPEN)

•  For details on the refrigerant cycle, refer to [REFRIGERANT SYSTEM] and [HEATER SYSTEM]. (See REFRIGERANT SYSTEM.)(See HEATER SYSTEM.)


PTC heater control

1.  The heat pump control unit calculates (1) the PTC heater output value (heat generation amount and operation time) based on the input signal from each sensor and the target temperature from the dash-electrical supply unit.

2.  The heat pump control unit outputs (2) the PTC heater operation signal to the PTC heater controller based on the calculated PTC heater output value.

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ECO mode control

1.  When the ECO mode icon is pressed, the heater control unit determines that the ECO mode is on and sends an ECO mode control signal to the heat pump control unit.

2.  After receiving the ECO mode control signal, the heat pump control unit performs climate control suppressing the power consumption by the climate control system.

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Heated steering wheel control (With heated steering wheel)

Manual mode
•  For the manual mode operation, refer to [HEATED STEERING WHEEL SYSTEM].(See HEATED STEERING WHEEL SYSTEM.)
Auto mode
1.  Based on the temperature setting and the signals (1) from each sensor which change according to the vehicle conditions, the dash-electrical supply unit performs heated steering wheel operation determination (2) when the link seat & climate control temperatures is enabled and the climate control unit auto setting in on.
2.  The dash-electrical supply unit outputs a heated steering wheel operation signal (3) based on the results of the heated steering wheel operation determination.
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Seat warmer control (With seat warmer)

Manual mode
•  For the manual mode operation, refer to [SEAT WARMER SYSTEM].(See SEAT WARMER SYSTEM.)
Auto mode
1.  Based on the temperature setting and the signals (1) from each sensor which change according to the vehicle conditions, the dash-electrical supply unit performs seat warmer operation determination (2) when the link seat & climate control temperatures is enabled and the climate control unit auto setting in on.
2.  The dash-electrical supply unit outputs a seat warmer operation signal (3) based on the results of the seat warmer operation determination.
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Climate control timer control

1.  When the climate control timer is set on the center display, the climate control timer setting signal (1) is sent to the BCM via the connectivity master unit (CMU).

2.  When the climate control timer reaches the start time, the BCM sends a climate control timer operation signal (2) to the heat pump control unit.

3.  After receiving the climate control timer operation signal, the heat pump control unit performs climate control according to the settings made.

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Control for remote climate control (when Connected Service is enabled)

1.  When the remote climate control is set using a Smartphone,

a remote climate control setting signal (1) is sent to the emergency call unit.

2.  When the emergency call unit receives the remote climate control setting signal, it sends a remote climate control operation signal (2) to the heat pump control unit via the BCM.

3.  After receiving the remote climate control operation signal, the heat pump control unit performs climate control according to the settings made.

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