Mazda 2007 CX-9, Service Highlights, Page: 332 / 614

CONTROL SYSTEM
07-40–20
TARGET TEMPERATURE BLOCK DIAGRAM
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End Of Sie
TARGET TEMPERATURE OPERATION
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Target Temperature Calculation
•
The target temperature is calculated using the following formula based on input from the cabin temperature
sensor, the ambient temperature sensor (Correction is added according to vehicle speed.) and the solar
radiation sensor, in addition to the temperature set by the climate control unit.
Front (driver side)
Front target temperature = (K
1
x (driver-side set tempe K
2
)) - (K
3
x cabin temperature) - (K
4
x
ambient temperature) - (K
5
x (C
1
x (solar radiation temperature (LH) + solar radiation temperature (RH)))) +
C
2
+ C
3
K
1
-K
5
:Control coefficient
C
1
-C
3
:Correction coefficient
Front (passenger side)
Front target temperature = (K
1
x (passenger-side set tempe K
2
)) - (K
3
x cabin temperature) - (K
4
x
ambient temperature) - (K
5
x ((1 - C
1
) x (solar radiation temperature (LH) + solar radiation temperature
(RH)))) + C
2
+ C
3
K
1
-K
5
:Control coefficient
C
1
-C
3
:Correction coefficient
Rear (Rear control switch off)
Rear target temperature = (K
1
x (driver-side set tempe K
2
)) - (K
3
x cabin temperature) - (K
4
x
ambient temperature) - (K
5
x (1/2 (solar radiation temperature (LH) + solar radiation temperature (RH))) + C
K
1
-K
5
:Rear control coefficient
C : Correction coefficient
Rear (Rear control switch on)
Rear target temperature = (K
1
x (rear set tempe K
2
)) - (K
3
x cabin temperature) - (K
4
x ambient
temperature) - (K
5
x (1/2 (solar radiation temperature (LH) + solar radiation temperature (RH))) + C
1
+ C
2
K
1
-K
5
:Rear control coefficient
C
1
-C
2
:Correction coefficient
REAR CLIMATE
CONTROL UNIT
FRONT CLIMATE
CONTROL UNIT
SOLAR RADIATION
SENSOR
CABIN
TEMPERATURE
SENSOR
AMBIENT
TEMPERATURE
SENSOR
DRIVER-SIDE
SET TEMPERATURE
AIRFLOW TEMPERATURE CONTROL
AIRFLOW VOLUME CONTROL
AIRFLOW MODE CONTROL
AIR INTAKE CONTROL
A/C COMPRESSOR CONTROL
TARGET
TEMPERATURE
CALCULATION
REAR SET
TEMPERATURE
PASSENGER-SIDE
SET TEMPERATURE
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