Nissan Leaf. Instruction — part 755
COMPONENT PARTS
HAC-23
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
• When the drive signal from the A/C auto amp. is input into the motor, the step motor inside the motor rotates
by the number of steps corresponding to the drive signal and stops at the target door position.
• The rotational movement of the motor is transmitted via the rod and lever to the air mix doors (upper air mix
door, lower air mix door), changing the discharge air temperature.
AIR MIX DOOR MOTOR DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing the pattern of excitation.
A/C UNIT ASSEMBLY : Mode Door Motor
INFOID:0000000010121735
DESCRIPTION
• The step motor type motor is adopted for mode door motor.
• When the drive signal from the A/C auto amp. is input into the motor, the step motor inside the motor rotates
by the number of steps corresponding to the drive signal and stops at the target door position.
• The rotational movement of the motor is transmitted via the rod, link, and lever to the mode doors (center
ventilator, defrost door, sub-defrost door, side ventilator door, and foot door), changing the air outlets.
MODE DOOR MOTOR DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing the pattern of excitation.
A/C UNIT ASSEMBLY : Intake Door Motor
INFOID:0000000010121736
• Intake door motor consists of a motor that drives the door and PBR (Potentiometer Balance Resister) that
detects door position.
• Motor operates according to drive signal from A/C auto amp.
• Motor rotational movement is transmitted via the lever to the intake door, changing the air inlet.
JSIIA1655GB
JZIIA0033GB
HAC-24
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
COMPONENT PARTS
• The A/C auto amp. monitors the door position based on the PBR signal that changes in coordination with the
rotation of the motor.
A/C UNIT ASSEMBLY : Blower Motor
INFOID:0000000010121737
Brush motor is adopted for blower motor. Rotation speed changes
according to voltage from power transistor.
JSIIA1633GB
JPIIA1575ZZ
JMIIA0793GB
COMPONENT PARTS
HAC-25
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
A/C UNIT ASSEMBLY : Power Transistor
INFOID:0000000010121738
• Power transistor, that uses MOS field effect transistor, is adopted
for blower fan motor speed control.
NOTE:
A MOS field effect transistor is a transistor in which the gate is
composed of a metal-oxide-semiconductor (MOS). Field effect
transistor is controlled by voltage, while ordinary transistor is con-
trolled by current. Electrode of field effect transistor is called
source, drain, or gate, while electrode of ordinary transistor is
called emitter, collector, or base.
• Power transistor continuously controls voltage to blower fan motor
(approximately 0 to 16 V), according to gate voltage from A/C auto
amp.
• This power transistor does not require HI relay even when the maximum voltage is applied to blower fan
motor at HI status, because voltage drop is nominal.
A/C Auto Amp.
INFOID:0000000010121739
A/C auto amp. controls A/C by calculations based on signals input from each sensor and switch. A self-diag-
nosis function is integrated into the A/C auto amp. allowing diagnosis of automatic air conditioning system to
be performed quickly.
Ambient Sensor
INFOID:0000000010121740
Ambient sensor measures ambient air temperature. This sensor
uses a thermistor that decreases electrical resistance as tempera-
ture increases.
In-Vehicle Sensor
INFOID:0000000010121741
In-vehicle sensor measures temperature of interior air that is sucked
into the aspirator. This sensor uses a thermistor that decreases elec-
trical resistance as temperature increases.
JPIIA1634ZZ
JMIIA1719GB
JMIIA1720GB
HAC-26
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
COMPONENT PARTS
Sunload Sensor
INFOID:0000000010121742
Sunload sensor measures sunload amount. This sensor converts
the sunload to a voltage signal by photodiode and transmits the sig-
nal to the A/C auto amp.
Refrigerant Pressure Sensor
INFOID:0000000010121743
DESCRIPTION
• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it
to VCM.
• A/C auto amp. performs compressor protection control by using a refrigerant pressure signal sent from VCM
via EV CAN communication.
STRUCTURE AND OPERATION
• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection area and a
signal processing area.
• The pressure detection area is the variable capacity compressor. It changes the internal capacitance accord-
ing to the pressure.
• The signal processing area detects the capacitance of pressure detection area, converts it into the voltage,
and outputs it to VCM.
Electric Compressor
INFOID:0000000010121744
• An electric scroll compressor is used.
• A 3-phase output inverter with IGBT (Insulated Gate Bipolar Tran-
sistor) is used.
NOTE:
IGBT (Insulated Gate Bipolar Transistor) is a transistor which is
suitable for high voltages and large currents and which can control
large electrical power using a small gate voltage.
• The structure integrates the inverter, compressor, and motor,
allowing compressor to operate at any speed.
• The inverter communicates with A/C auto amp., and uses PWM
control
Note
to control the motor speed via the drive circuit.
NOTE:
• PWM (Pulse Width Modulation) is a system that controls current and voltage by changing the duty ratio of
a constant frequency pulse wave.
• PWM is used as the adjustment method of output voltage when inverter is used as a power supply for con-
trolling motor speed.
• PWM changes voltage application time (pulse width) using a semiconductor element and controls motor
speed.
JPIIA1863GB
JSIIA1770GB
JMIIA2739ZZ
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