FULL AUTO AIR CONDITIONER [FULL-AUTO AIR CONDITIONER]

id0740a1126300


Block Diagram

•  The control system consists of input components (sensors), output components (actuators, magnetic clutch, power MOS FET, and other parts), and a control device (climate control unit).
am3zzn00003193

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
Airflow volume control
Airflow volume automatic control
•  Engine coolant temperature correction (warm-up correction)
•  Mild start correction
•  MAX HOT and MAX COLD correction
•  Window fogging prevention correction at start
•  Starting compensation correction
•  Defroster correction
•  Starting burnt-out prevention function
Airflow volume manual control
•  Defroster correction
•  Starting burnt-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 control
•  Defroster correction
•  Ambient temperature correction
A/C compressor control
A/C compressor automatic control
•  Defroster correction
A/C compressor manual control
•  Defroster correction

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 (European (L.H.D. U.K.) specs.)

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 dial
HI
Automatic control
Manual control*2
Manual control*2
1
2
3
4
5
6
7
7
LO
Automatic control
Manual control*3
Manual control*3
1
1
1
2
3
4
5
6
MODE switch
Automatic control
Automatic control
Automatic control*4
No change
DEFROSTER switch
Automatic control
Defroster correction
Automatic control*4
Defroster correction
A/C switch
Automatic control
Automatic control
No change
*5
No change
REC switch
Automatic control
Automatic control
No change
No change
Driver-side temperature setting dial*1
15.0/60
MAX COLD
MAX HI*6
MAX HI*6
No change
15.5—28.5/
61—83
Automatic control
Automatic control
No change
No change
29.0/84
MAX HOT
AUTO HI*6
AUTO HI*6
No change
Passenger-side temperature setting dial
15.0/60
MAX COLD
MAX HI*6
MAX HI*6
No change
15.5—28.5/
61—83
Automatic control
Automatic control
No change
No change
29.0/84
MAX HOT
AUTO HI*6
AUTO HI*6
No change
Dual switch
Automatic control
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. When the fan is OFF, does not allow the temperature setting switch.
*2  :Increases to the manual voltage that is closest to the auto or defroster correction voltage.
*3  :Decreases to the manual voltage that is closest to the auto or defroster correction voltage.
*4  :Returns to condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.
*5  :Returns to fan condition before fan off. However, if it had been defroster correction (manual control) returns to condition as follows.
1.  The condition before fan off defroster correction, the fan condition return to the condition before defroster correction.
2.  The condition before fan off defroster correction and furthermore the condition before defroster correction is fan off, the fan condition change to the automatic control. (It has higher priority than 1)
3.  The condition before fan off defroster correction and fan is manually operated during that defroster correction, the fan condition return to the manually operated condition. (It has higher priority than 1 and 2)
*6  :MAX COLD on both driver and passenger sides: MAX HI, MAX HOT on both driver and passenger sides: AUTO HI

Airflow temperature control, airflow volume control (Australian, General (L.H.D. R.H.D.) specs.)

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 dial
HI
Automatic control
Manual control*2
Manual control*2
1
2
3
4
5
6
7
7
LO
Automatic control
Manual control*3
Manual control*3
1
1
1
2
3
4
5
6
MODE switch
Automatic control
Automatic control
Automatic control*4
No change
DEFROSTER switch
Automatic control
Defroster correction
Automatic control*4
Defroster correction
A/C switch
Automatic control
Automatic control
No change
*5
No change
REC switch
Automatic control
Automatic control
No change
No change
Driver-side temperature setting dial*1
18.0/64
MAX COLD
MAX HI*6
MAX HI*6
No change
18.5—31.5/
65—89
Automatic control
Automatic control
No change
No change
32.0/90
MAX HOT
AUTO HI*6
AUTO HI*6
No change
Passenger-side temperature setting dial
18.0/64
MAX COLD
MAX HI*6
MAX HI*6
No change
18.5—31.5/
65—89
Automatic control
Automatic control
No change
No change
32.0/90
MAX HOT
AUTO HI*6
AUTO HI*6
No change
Dual switch
Automatic control
No change
No change
No change

*1  :Adjusted up or down in increments of 0.5 with a range of 18.0—32.0 or 1 with a range of 64—90. When the fan is OFF, does not allow the temperature setting switch.
*2  :Increases to the manual voltage that is closest to the auto or defroster correction voltage.
*3  :Decreases to the manual voltage that is closest to the auto or defroster correction voltage.
*4  :Returns to condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.
*5  :Returns to fan condition before fan off. However, if it had been defroster correction (manual control) returns to condition as follows.
1.  The condition before fan off defroster correction, the fan condition return to the condition before defroster correction.
2.  The condition before fan off defroster correction and furthermore the condition before defroster correction is fan off, the fan condition change to the automatic control. (It has higher priority than 1)
3.  The condition before fan off defroster correction and fan is manually operated during that defroster correction, the fan condition return to the manually operated condition. (It has higher priority than 1 and 2)

Airflow mode control, air intake control, A/C compressor control (European (L.H.D. U.K.) specs.)

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 dial
HI
Automatic control
No change
Automatic control
No change
Automatic control
No change
LO
Automatic control
No change
Automatic control
No change
Automatic control
No change
MODE switch
Up
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
Automatic control
No change
Automatic control
No change
Down
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER (warm-up) → HEAT
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER (manual) → HEAT
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→OFF
OFF→A/C
A/C→OFF
OFF→A/C
REC switch
Automatic control
No change
FRESH→REC
REC→FRESH
FRESH→REC
REC→FRESH
Automatic control
No change
Driver-side temperature setting dial*1
15.0/60
Automatic control
No change
Automatic control
No change
Automatic control
No change
15.5—28.5/
61—83
Automatic control
No change
Automatic control
No change
Automatic control
No change
29.0/84
Automatic control
No change
Automatic control
No change
Automatic control
No change
Passenger-side temperature setting dial
15.0/60
Automatic control
No change
Automatic control
No change
Automatic control
No change
15.5—28.5/
61—83
Automatic control
No change
Automatic control
No change
Automatic control
No change
29.0/84
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

*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.

Airflow mode control, air intake control, A/C compressor control (Australian, General(L.H.D. R.H.D.) specs.)

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 dial
HI
Automatic control
No change
Automatic control
No change
Automatic control
No change
LO
Automatic control
No change
Automatic control
No change
Automatic control
No change
MODE switch
Up
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
VENT → BI-LEVEL
BI-LEVEL → HEAT
HEAT → DEF/HEAT
DEF/HEAT → VENT
Automatic control
No change
Automatic control
No change
Down
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER → HEAT
VENT → DEF/HEAT
DEF/HEAT → HEAT
HEAT → BI-LEVEL
BI-LEVEL → VENT
DEFROSTER → HEAT
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→OFF
OFF→A/C
A/C→OFF
OFF→A/C
REC switch
Automatic control
No change
FRESH→REC
REC→FRESH
FRESH→REC
REC→FRESH
Automatic control
No change
Driver-side temperature setting dial*1
18.0/64
Automatic control
No change
Automatic control
No change
Automatic control
No change
18.5—31.5/
65—89
Automatic control
No change
Automatic control
No change
Automatic control
No change
32.0/90
Automatic control
No change
Automatic control
No change
Automatic control
No change
Passenger-side temperature setting dial
18.0/64
Automatic control
No change
Automatic control
No change
Automatic control
No change
18.5—31.5/
65—89
Automatic control
No change
Automatic control
No change
Automatic control
No change
32.0/90
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

*1  :Adjusted up or down in increments of 0.5 with a range of 18.0—32.0 or 1 with a range of 64—90.

Sensor Signal Delay Function

•  Due to factors such as direct and intermittent sunlight (travelling through a city or highway tunnel), or radiant heat from the ground under a parked vehicle, as well as the opening and closing of doors, the amount of solar radiation and the ambient and cabin temperatures may change intermittently, partially, or suddenly. If control was performed based exactly on these variations, the air conditioning function would be negatively effected and smooth control could not occur. In order to prevent this, the climate control unit delays the input signals for solar radiation and the ambient and cabin temperature as shown in the following figure. Stable control occurs due to the reading out of an average of all the variations.
•  When the engine is re-started after being temporarily stopped, the ambient temperature sensor may detect a temperature higher then the actual ambient temperature. To prevent this, when the engine coolant temperature exceeds the specified value, the detected ambient temperature is corrected based on the data for the ambient temperature before the engine was stopped, and stored in the climate control unit. Control is then performed accordingly.
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