Nissan Leaf. Instruction — part 805
COMPONENT PARTS
HAC-223
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
• 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:0000000010121932
Brush motor is adopted for blower motor. Rotation speed changes
according to voltage from power transistor.
JSIIA1633GB
JPIIA1575ZZ
JMIIA0793GB
HAC-224
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
COMPONENT PARTS
A/C UNIT ASSEMBLY : Power Transistor
INFOID:0000000010121933
• 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:0000000010121934
A/C auto amp. controls A/C by calculations based on signals input from each sensor and switch. A/C auto
amp. a self-diagnosis function is integrated in A/C auto amp. allowing diagnosis of automatic air conditioning
system to be performed quickly.
Ambient Sensor
INFOID:0000000010121935
Ambient sensor measures ambient air temperature. This sensor
uses a thermistor that decreases electrical resistance as tempera-
ture increases.
In-Vehicle Sensor
INFOID:0000000010121936
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
COMPONENT PARTS
HAC-225
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Sunload Sensor
INFOID:0000000010121937
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:0000000010121938
DESCRIPTION
• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it
to VCM.
• VCM performs the cooler system protection and each engine control by the input voltage.
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:0000000010121939
• An electric scroll compressor is used.
• A 3-phase output inverter with IPM
Note
is used.
• The inverter is adopted to IPM
Note
for smaller size and improved
reliability.
NOTE:
IPM (Intelligent Power Module) is the element which delivered
power device equivalent to IGBT and the protection feature of the
circuit to one package.
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.
JPIIA1863GB
PBIB2657E
JSIIA1622ZZ
HAC-226
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
COMPONENT PARTS
• 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.
• The IPM contains an internal protection circuit, and uses the inverter control circuit to monitor for an
increase in motor drive circuit temperature in order to prevent circuit overheating.
• The motor uses a DC brushless motor, with speed control performed by the inverter drive circuit.
JMIIA2059GB
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