A/C Compressor Control System Diagram; A/C Compressor Control Operation - Mazda CX-9 2007 Service Highlights

A/C COMPRESSOR CONTROL SYSTEM DIAGRAM

EVAPORATOR
TEMPERATURE
A/C SWITCH
SENSOR
(FRONT/REAR)
SET
FRONT
TEMPERATURE
DEFROSTER
SWITCH
End Of Sie

A/C COMPRESSOR CONTROL OPERATION

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.
A/C MODE ON/OFF DECISION
ECO MODE A/C SIGNAL ON/OFF DECISION
A/C SIGNAL ON
A/C SIGNAL OFF
CONTROL SYSTEM
FRONT
CLIMATE
CONTROL
UNIT
SIGNAL
TARGET
TEMPERATURE
A/C ON MODE
A/C OFF MODE
1.5 {34.7}
TEMPERATURE OF THE AIR PASSING THROUGH THE EVAPORATOR
LO
TEMPERATURE OF THE AIR PASSING THROUGH THE EVAPORATOR
OUTPUT
PCM
OUTPUT
A/C RELAY
OPERATION
2.5 {36.5} (°C {°F})
VARIES WITH ANBIENT, TARGET
TEMPERATURE COMPUTATION VALUE
id074000103100
MAGNETIC
CLUTCH
OPERATION
ac9uun00000237
id074000103200
HI
am8rrn00000283
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