Mazda 6. Manual — part 87
CONTROL SYSTEM
U–21
U
Outline of Control System
•
In the full-auto air conditioner system, the climate control unit carries out five basic types of controls based on
signals from various sensors and control signals from the climate control unit. The climate control unit also has
three supplementary functions.
Basic control
Control description
Correction
Airflow temperature control
Airflow temperature automatic
control
•
Air intake correction
•
A/C correction
•
MAX HOT and MAX COLD correction
•
Coolant temperature correction
•
Fail-safe function
Airflow volume control
Airflow volume automatic control
•
Coolant temperature correction (warm-up correction)
•
Mild start correction
•
MAX HOT and MAX COLD correction
•
Windshield mist prevention correction
•
Start compensation correction
•
Defroster correction
•
Fail-safe function
Airflow volume manual control
•
Defroster correction
•
Fail-safe function
Airflow mode control
Airflow mode automatic control
•
Ambient temperature correction (European (L.H.D.
U.K.) specs.)
•
Coolant temperature correction
•
Fail-safe function
Airflow mode manual control
•
Fail-safe function
Air intake control
Air intake automatic control
•
MAX COLD correction
•
Defroster correction
•
Ambient temperature correction
•
A/C OFF correction
Air intake manual control
•
Defroster correction
A/C compressor control
A/C compressor automatic control
•
Defroster correction
•
Ambient temperature correction
•
Windshield mist prevention correction
•
MAX COLD correction
A/C compressor manual control
•
Defroster correction
•
Ambient temperature correction
•
Windshield mist prevention correction
Supplementary function
Sensor fail-safe function
Sensor signal delay function
On-board diagnostic function
U–22
CONTROL SYSTEM
Control Transition
Air mix, airflow volume control
( ) : GCC specs.
*1
: Setting temperature fluctuates up or down in increments of 0.5, within the range of 15.0 to 29.0 (European
(L.H.D. U.K.) specs.) or 18.0 to 32.0 (GCC specs.). When the fan is OFF, the setting temperature can be
adjusted in the range of
±
1.0.
*2
: Goes up to the closest manual voltage to auto voltage or defroster correction voltage.
*3
: Goes down to the closest manual voltage to auto voltage or defroster correction voltage.
*4
: Coolant temperature correction takes precedence.
*5
: Returns to condition prior to defroster operation. However, if it is off prior to defroster operation, it switches to
automatic control.
Airflow mode control, air intake control, A/C compressor control
Operation switch
Air mix control
Airflow volume control
Control before
switched
Control before switched
Automatic
control
Automatic control
Defroster
correction
Manual control
OF
F
1
2
3
4
5
6
7
OFF switch
AUTO
OFF
OFF
OFF
AUTO switch
AUTO
AUTO
AUTO
AUTO
Fan switch
+
AUTO
MANUAL
*2
MANUAL
*2
1
2
3
4
5
6
7
7
–
AUTO
MANUAL
*3
MANUAL
*3
1
1
1
2
3
4
5
6
MODE switch
AUTO
AUTO
*5
No change
DEFROSTER switch
AUTO
Defroster correction
*5
Defroster correction
A/C switch
AUTO
AUTO
No change
No change
REC/FRESH switch
AUTO
AUTO
No change
No change
Temperatur
e setting
dial
*1
15.0 (18.0)
MAX COLD
MAX HI
MAX HI
No change
15.5—28.5
(18.5—
31.5)
AUTO
AUTO
No change
No change
29.0 (32.0)
MAX HOT
AUTO HI
*4
AUTO HI
No change
Operation switch
Airflow mode control
Air intake control
A/C compressor control
Control before switched
Control before switched
Control before switched
Automatic
control
Manual
control
Automatic
control
Manual
control
Automatic
control
Manual
control
OFF switch
Condition
before OFF
switch ON
*2
No change
*2
Condition
before OFF
switch ON
*2
No change
*2
OFF
OFF
AUTO switch
AUTO
AUTO
AUTO
AUTO
AUTO
AUTO
Fan switch
+
AUTO
No change
AUTO
No change
AUTO
No change
–
AUTO
No change
AUTO
No change
AUTO
No change
MODE switch
VENT
→
BI-LEVEL
BI-LEVEL
→
HEAT
HEAT
→
HEAT/DEF
HEAT/DEF
→
VENT
DEFROSTER
→
HEAT
VENT
→
BI-LEVEL
BI-LEVEL
→
HEAT
HEAT
→
HEAT/DEF
HEAT/DEF
→
VENT
DEFROSTER
→
HEAT
AUTO
No change
*2
AUTO
No change
*3
DEFROSTER switch
DEFROSTER
*2
DEFROSTER
*2
DEFROSTER
correction
*2
DEFROSTER
correction
*2
DEFROSTER
correction
*3
DEFROSTER
correction
*3
A/C switch
AUTO
No change
AUTO
No change
A/C
→
ECO
ECO
→
A/C
OFF
→
A/C
*4
A/C
→
ECO
ECO
→
A/C
OFF
→
A/C
*4
REC/FRESH switch
AUTO
No change
FRESH
→
REC
REC
→
FRESH
FRESH
→
REC
REC
→
FRESH
AUTO
No change
CONTROL SYSTEM
U–23
U
( ) : GCC specs.
*1
: Setting temperature fluctuates up or down in increments of 0.5, within the range of 15.0 to 29.0 (European
(L.H.D. U.K.) specs.) or 18.0 to 32.0 (GCC specs.). When the fan is OFF, the setting temperature can be
adjusted in the range of
±
1.0.
*2
: If operated when in defroster correction, it returns to the condition prior to defroster operation.
*3
: Ambient temperature correction takes precedence. If operated when in defroster correction, it returns to the
condition prior to defroster operation. However, if it is off prior to defroster operation, it switches to automatic
control.
*4
: Ambient temperature correction takes precedence. When the fan is OFF, the A/C is fixed at off.
End Of Sie
AIRFLOW TEMPERATURE CONTROL
A6E854001044T04
•
Airflow temperature is controlled by the air mix actuator so that the passenger compartment temperature
remains at the target temperature (control computation value T1).
•
Control computation value T1 is the target temperature in the cabin set by the climate control unit based on
differences among set temperature, input temperature from the sensors, and sunlight intensity.
.
Temperatur
e setting
dial
*1
15.0 (18.0)
AUTO
No change
AUTO
No change
AUTO
No change
15.5—28.5
(18.5—
31.5)
29.0 (32.0)
Operation switch
Airflow mode control
Air intake control
A/C compressor control
Control before switched
Control before switched
Control before switched
Automatic
control
Manual
control
Automatic
control
Manual
control
Automatic
control
Manual
control
A6E8540T041
1
Set temperature
2
Sunlight intensity
3
Ambient temperature
4
Evaporator temperature
5
Cabin temperature
6
Airflow mode
7
Air intake mode
8
A/C compressor control condition
9
Signals
10
Climate control unit
11
Output
12
Feedback
13
Air mix actuator
14
Operation
15
Air mix doors
16
Airflow temperature changes
U–24
CONTROL SYSTEM
Airflow Temperature Automatic Control
•
Based on the set temperature and sunlight intensity, the climate control unit calculates the air mix actuator
opening angle characteristic. The higher the sunlight intensity, the lower the air mix actuator opening angle
characteristic.
•
The climate control unit compares the air mix actuator opening angle characteristic, the present ambient
temperature and target temperature (control computation value T1) and determines a basic angle of opening
for the air mix actuator.
.
Correction
Air intake correction
•
When the A/C mode is off, the air mix actuator opening angle is corrected to prevent airflow temperature rise
when the air intake mode is switched from fresh air to recirculated air. In addition, this correction retards the air
mix actuator operation to prevent a sudden drop in airflow temperature.
.
A6E8540T042
1
Air mix actuator basic opening
2
MAX HOT
3
MAX COLD
4
Ambient temperature
5
Low
6
High
7
When the sunlight intensity is low
8
When the sunlight intensity is high
9
Air mix actuator opening angle characteristic (A/C
off mode)
10
Air mix actuator opening angle characteristic (A/C
on mode)
A6E8540T001
1
Air mix actuator opening angle delay
2
Air intake mode
3
Air mix actuator opening angle correction amount
4
HOT
5
COLD
6
FRESH
7
RECIRCULATE
8
Time
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