FULL AUTO AIR CONDITIONER [FULL-AUTO AIR CONDITIONER]

id0740a1320200


Outline

•  The climate control unit performs the following controls based on the signals from each switch/dial and the sensor.
―  Airflow temperature control
―  Airflow volume control
―  Airflow mode control
―  Air intake control
―  A/C compressor control

A/C cut-off control

•  Controls the A/C operation by switching the A/C relay on/off at the optimal timing according to engine operation conditions. (See A/C CUT-OFF CONTROL [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)(See A/C CUT-OFF CONTROL [SKYACTIV-D 2.2].)


Block Diagram

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Control Table

•  The full-auto air conditioner system functions based on the five basic types of controls and three supplementary functions.

Basic control

Control description

Correction control
Airflow temperature control
Airflow temperature automatic control
•  MAX HOT and MAX COLD correction
•  Engine coolant temperature correction
Airflow volume control
Airflow volume automatic control
•  Engine coolant temperature correction (warm-up correction)
•  Mild start correction
•  MAX HOT and MAX COLD correction
•  Defroster correction
•  Start-up window fogging prevention correction
•  Starting compensation correction
•  Start-up burn-out prevention function
Airflow volume manual control
•  Defroster correction
•  Start-up burn-out prevention function
Airflow mode control
Airflow mode automatic control
•  Engine coolant temperature correction (warm-up correction)
Airflow mode manual control
—
Air intake control
Air intake automatic control
•  Defroster correction
•  Ambient temperature correction
Air intake manual control
•  Defroster correction
A/C compressor control
A/C compressor automatic control
•  Defroster correction
A/C compressor manual control

Supplementary function
Fail-safe function
Sensor signal delay function
On-board diagnostic function


Control Type Transition by Switch Operation

Airflow temperature control, airflow volume control

Operation switch

Airflow temperature control

Airflow volume control

Control prior to switch operation

Control prior to switch operation

Automatic control

Automatic control

Defroster correction

Manual control

OFF

1

2

3

4

5

6

7
OFF switch
Automatic control
OFF
OFF
OFF
AUTO switch
Automatic control
Automatic control
Automatic control
Automatic control
Airflow volume control switch
UP
Automatic control
Manual control*4
Manual control*4
1
2
3
4
5
6
7
7
DOWN
Automatic control
Manual control*5
Manual control*5
1
1
1
2
3
4
5
6
MODE switch
Automatic control
Automatic control
Automatic control*6
No change
DEFROSTER switch
Automatic control
Defroster control
Automatic control*6
Defroster control
A/C switch
Automatic control
Automatic control
No change
*7
No change
RECIRCULATE switch
Automatic control
Automatic control
No change
No change
FRESH switch
Automatic control
Automatic control
No change
No change
Driver-side temperature setting dial*1
15.0/60*2
18.0/64*3
MAX COLD
MAX HI
MAX HI
No change
15.5—28.5/61—83*2
18.5—31.5/65—89*3
Automatic control
Automatic control
No change
No change
29.0/84*2
32.0/90*3
MAX HOT
AUTO HI
AUTO HI
No change
Passenger-side temperature setting dial*1
15.0/60*2
18.0/64*3
MAX COLD
MAX HI
MAX HI
No change
15.5—28.5/61—83*2
18.5—31.5/65—89*3
Automatic control
Automatic control
No change
No change
29.0/84*2
32.0/90*3
MAX HOT
AUTO HI
AUTO HI
No change
Dual switch
Automatic control
No change
Defroster control
No change
Rear window defogger switch
No change
No change
No change
No change

*1  :Adjusted up or down in increments of 0.5 with a range of 15.0—29.0 or 1 with a range of 60—84.
*2  :European (L.H.D. U.K.) specs.
*3  :Except European (L.H.D. U.K.) specs.
*4  :Increases to the manual voltage that is closest to the auto or defroster correction voltage.
*5  :Decreases to the manual voltage that is closest to the auto or defroster correction voltage.
*6  :Returns to condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.
*7  :Returns to fan condition before fan off. However, if it had been defroster correction (manual control) returns to condition as follows.
1.  If the fan switch is operated during defroster control (manual control) prior to turning off the A/C switch, the system returns to the fan operational status.
2.  If the fan switch is not operated during defroster control (manual control) prior to turning off the A/C switch, the system returns to the status prior to the defroster control. If the fan is off prior to the defroster control, the system changes to the fan auto control.

Airflow mode control, air intake control, A/C compressor control

Operation switch

Airflow mode control

Air intake control

A/C compressor control

Control prior to switch operation

Control prior to switch operation

Control prior to switch operation

Automatic control

Manual control

Automatic control

Manual control

Automatic control

Manual control
OFF switch
Fixed at mode before turned OFF
No change
Fixed at mode before turned OFF
No change
OFF
OFF
AUTO switch
Automatic control
Automatic control
Automatic control
Automatic control
Automatic control
Automatic control
Airflow volume control switch
UP
Automatic control
No change
Automatic control
No change
Automatic control
No change
DOWN
Automatic control
No change
Automatic control
No change
Automatic control
No change
MODE switch
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
DEFROSTER →*4
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
DEFROSTER →*4
Automatic control
No change
Automatic control
No change
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER →*4
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER →*4
Automatic control
No change
Automatic control
No change
DEFROSTER switch
DEFROSTER
DEFROSTER
Defroster correction
Defroster correction
Defroster correction
Defroster correction
A/C switch
Automatic control
No change
Automatic control
No change
A/C→ECO
ECO→OFF
OFF→A/C
A/C→ECO
ECO→OFF
OFF→A/C
RECIRCULATE switch
Automatic control
No change
FRESH→REC
FRESH→REC
Automatic control
No change
FRESH switch
Automatic control
No change
REC→FRESH
REC→FRESH
Automatic control
No change
Driver-side temperature setting dial*1
15.0/60*2
18.0/64*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
15.5—28.5/61—83*2
18.5—31.5/65—89*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
29.0/84*2
32.0/90*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
Passenger-side temperature setting dial*1
15.0/60*2
18.0/64*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
15.5—28.5/61—83*2
18.5—31.5/65—89*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
29.0/84*2
32.0/90*3
Automatic control
No change
Automatic control
No change
Automatic control
No change
Dual switch
Automatic control
No change
Automatic control
No change
No change
No change
Rear window defogger switch
No change
No change
No change
No change
No change
No change

*1  :Adjusted up or down in increments of 0.5 with a range of 15.0—29.0 or 1 with a range of 60—84.
*2  :European (L.H.D. U.K.) specs.
*3  :Except European (L.H.D. U.K.) specs.
*4  :Returns to condition prior to defroster operation.

Sensor Signal Delay Function

•  The amount of solar radiation, and the ambient and cabin temperatures may change due to factors such as direct and intermittent sunlight (traveling through a city or a highway tunnel), or radiant heat from the ground under parked vehicles as well as the opening and closing of doors.
•  If control was performed based exactly on these variations, the air conditioning function would be negatively affected and smooth control could not occur.
•  In order to prevent this, the climate control unit delays and smoothes the input signals for solar radiation, and the ambient and cabin temperature as shown in the following figure, realizing stable control.
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•  When the engine is restarted after being temporarily stopped, the ambient temperature sensor may detect a temperature higher than the actual ambient temperature.
•  To prevent this, if the engine coolant temperature exceeds 55 °C {131 °F}, control of each system is performed based on the ambient temperature data before the engine was stopped, which is stored in the climate control unit.