Nissan Leaf. Manual - part 805

COMPONENT PARTS

HAC-223

< SYSTEM DESCRIPTION >

[AUTO A/C (WITHOUT HEAT PUMP)]

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• 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

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HAC

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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