Mazda 2007 CX-9, Service Highlights

Page: 341 / 614

CONTROL SYSTEM
07-40–29
07-40
A/C COMPRESSOR CONTROL SYSTEM DIAGRAM
id074000103100
End Of Sie
A/C COMPRESSOR CONTROL OPERATION
id074000103200
A/C Compressor Automatic Control
•
The front climate control unit switches modes between the A/C mode and ECO mode based on the input signal
from evaporator temperature sensor and ambient temperature sensor.
•
In A/C mode, the A/C signal (magnetic clutch) is turned on/off according to the temperature of the air passing
through the evaporator. The temperature of the air passing through the evaporator at which the A/C signal turns
off is determined by the ambient temperature calculation value that is calculated based on the ambient
temperature, target temperature. By setting the A/C signal off temperature low when strong cooling
performance is needed, such as when the ambient temperature is high, and setting it high in other conditions,
cooling comfort and fuel economy during A/C operation are improved.
TARGET
TEMPERATURE
FRONT
CLIMATE
CONTROL
UNIT
PCM
A/C SWITCH
EVAPORATOR
TEMPERATURE
SENSOR
(FRONT/REAR)
FRONT
DEFROSTER
SWITCH
A/C RELAY
MAGNETIC
CLUTCH
OUTPUT
OUTPUT
OPERATION
SIGNAL
SET
TEMPERATURE
OPERATION
ac9uun00000237
1.5 {34.7}
TEMPERATURE OF THE AIR PASSING THROUGH THE EVAPORATOR
TEMPERATURE OF THE AIR PASSING THROUGH THE EVAPORATOR
VARIES WITH ANBIENT, TARGET
TEMPERATURE COMPUTATION VALUE
A/C MODE ON/OFF DECISION
ECO MODE A/C SIGNAL ON/OFF DECISION
A/C ON MODE
A/C OFF MODE
A/C SIGNAL ON
A/C SIGNAL OFF
LO
HI
(
°
C {
°
F}) 2.5 {36.5}
am8rrn00000283
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