Nissan X-Trail 32. Manual — part 1387
SYSTEM
HAC-23
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control
INFOID:0000000010939702
• While air outlet is in automatic control, A/C auto amp. selects the
mode door position depending on a target air mix door angle and
outlet air temperature calculated from sunload.
• If ambient temperature is excessively low, D/F is selected to pre-
vent windshield fogging when air outlet is set to FOOT.
AUTOMATIC AIR CONDITIONING SYSTEM : Air Flow Control
INFOID:0000000010939703
DESCRIPTION
• A/C auto amp. changes gate voltage of power transistor and controls air flow continuously. When air flow is
increased, voltage of blower motor gradually increases to prevent a sudden increase in air flow.
• In addition to manual control and automatic control, air flow control is compose of starting fan speed control,
low coolant temperature starting control, high in-vehicle temperature starting control, and blower speed con-
trol at door motor operation.
AUTOMATIC AIR FLOW CONTROL
• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes voltage of blower motor and controls air flow continuously so that air flow matches to
target air flow.
• When air outlet is VENT or B/L, the minimum air flow is changed
depending on sunload.
STARTING FAN SPEED CONTROL
When blower motor is activated, A/C auto amp. gradually increases voltage of blower motor to prevent a sud-
den increase in discharge air flow. (T
1 –
T
2
= approximately 5 seconds)
NOTE:
Do not perform the starting air flow control when the discharge outlet
is set to DEF.
LOW COOLANT TEMPERATURE STARTING CONTROL
JMIIA0710GB
JMIIA1129GB
JMIIA1130GB
HAC-24
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
If the engine coolant temperature is 56
°
C (133
°
F) or less, to prevent
a cold discharged air flow, A/C auto amp. suspends blower motor
activation for the maximum 150 seconds depending on target air mix
door opening angle. After this, voltage of blower motor is increased
gradually, and blower motor is activated.
HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL
When evaporator temperature is high [intake sensor value is 35
°
C (95
°
F) or more], to prevent a hot dis-
charged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so that evapo-
rator is cooled by refrigerant.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
temporarily fan speed so that mode door moves smoothly.
AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control
INFOID:0000000010939704
• A/C auto amp. controls intake door motor, and change air inlet.
• While air inlet is in automatic control, A/C auto amp. selects air
inlet (fresh air intake, 20% fresh air intake, or recirculation)
depending on set temperature, in-vehicle temperature, and ambi-
ent temperature.
AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control
INFOID:0000000010939705
DESCRIPTION
• When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-
mits A/C ON signal and blower fan ON signal to ECM.
• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,
etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.
• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-
vates the compressor. Refer to
PCS-7, "RELAY CONTROL SYSTEM : System Description"
CONTROL BY A/C AUTO AMP.
Low Temperature Protection Control
When intake sensor detects that evaporator fin temperature is
[
−
5.0
°
C (23.0
°
F)] or less, A/C auto amp. requests ECM to turn the
compressor OFF, and stops the compressor.
When the air temperature returns to
[1.0
°
C (33.8
°
F)] or more, the
compressor is activated.
Refrigerant Discharge Amount Control
JMIIA1227GB
JMIIA0711GB
JMIIA2550GB
SYSTEM
HAC-25
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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• A/C auto amp. transmits the ECV control signal via CAN communication. IPDM E/R transmits the control sig-
nal to ECV according to the received ECV control signal.
• ECV is controlled according to change in the duty ratio of the transmitted control signal.
• Except when temperature setting is full cold or outlet is DEF, A/C auto amp. controls the refrigerant dis-
charge amount according to the required cooling capacity.
• A/C auto amp. increases the refrigerant discharge amount when evaporator temperature is higher than the
target temperature upper limit, and reduces the refrigerant discharge amount when evaporator temperature
is at or below the target temperature upper limit.
NOTE:
Target temperature upper limit value of evaporator can be changed using “TARGET EVAPORATOR TEMP
UPPER LIMIT SETTING” in “WORK SUPPORT” mode of CONSULT. Refer to
Evaporator Temperature Upper Limit Value"
.
Compressor Oil Circulation Control
When the engine starts, A/C auto amp. activates the compressor for a few seconds and circulates the com-
pressor oil once.
CONTROL BY ECM
Compressor Protection Control at Pressure Malfunction
When the high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm
2
, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2
, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2
, 20.3 psi) or less
Air Conditioning Cut Control
When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor.
AUTOMATIC AIR CONDITIONING SYSTEM : Door Control
INFOID:0000000010939706
SWITCH AND THEIR CONTROL FUNCTION
HAC-26
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
*: R9M engine models
NOTE:
The sub-defroster and side ventilator door include a permanent opening and does not fully close.
Intake door
Blower motor
Air conditioner filter
Evaporator
Heater core
PTC heater*
Air mix door (driver side/passenger
side)
Foot door
Side ventilator door
Sub defroster door
Center ventilator and defroster door
Fresh air
Recirculation air
Discharge air
Defroster
Center ventilator
Side ventilator
Rear ventilator
Front foot
Rear foot
JMIIA3570ZZ
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