Nissan Leaf. Manual — part 756
COMPONENT PARTS
HAC-27
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
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HAC
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• The IGBT temperature sensor uses the inverter control circuit to monitor for an increase in motor drive circuit
temperature in order to prevent circuit overheating.
• Adopts the HVIL (High-Voltage Interlock Loop) circuit inside the electric compressor, and CPU monitors the
HVIL circuit.
NOTE:
HVIL is composed of the loop circuit in the electric compressor and the high pressure system connector, and
detects connector poor connection, etc. due to open circuit.
• The motor uses a DC brushless motor, with speed control performed by the inverter drive circuit.
PTC Heater
INFOID:0000000010121745
• A PTC heater is used as the heat source for heating.
• Provides internal control circuit and performs LIN communication
with A/C auto amp.
• Based on the signals from A/C auto amp., the microcomputer
inside PTC heater controls the heater output by PWM
Note
.
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 controlling motor speed.
• PWM changes voltage application time (pulse width) using a
semiconductor element and controls PTC heater.
• PTC stands for “Positive Temperature Coefficient”, and is a ceramic material with barium titanate as the pri-
mary component.
JSIIA1771GB
JMIIA2741ZZ
HAC-28
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
COMPONENT PARTS
• When current is applied, it heats up. Upon reaching a certain tem-
perature (Curie temperature) the resistance suddenly increases,
limiting the current, and maintaining a constant amount of heating.
Heat Pump Control Unit
INFOID:0000000010121746
• The heat pump control unit performs LIN communication with A/C
auto amp.
• Converts the voltage values that are input from the compressor
discharge refrigerant temperature sensor and compressor suction
refrigerant temperature sensor to the temperature values, and
transmits the temperature values to the A/C auto amp.
• Controls the refrigerant channel switching 2 way type valve and
the refrigerant channel switching 3 way type valve by the request
signal from A/C auto amp.
Compressor Discharge Refrigerant Temperature Sensor
INFOID:0000000010121747
Compressor discharge refrigerant temperature sensor measures the
temperature of refrigerant that is discharged from the compressor
between the compressor and the inner condenser. This sensor uses
a thermistor that decreases electrical resistance as temperature
increases.
Compressor Suction Refrigerant Temperature Sensor
INFOID:0000000010121748
Compressor suction refrigerant temperature sensor measures the
temperature of refrigerant that is sucked into the compressor
between the condenser and the refrigerant channel switching 3 way
type valve. This sensor uses a thermistor that decreases electrical
resistance as temperature increases.
JSIIA1653GB
JMIIA2742ZZ
JSIIA1772GB
JSIIA1773GB
COMPONENT PARTS
HAC-29
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
C
D
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HAC
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Refrigerant Channel Switching 2 Way Type Valve
INFOID:0000000010121749
• Refrigerant channel switching 2 way type valve is an electro-mag-
netic valve that is controlled by the heat pump control unit.
• Controls the refrigerant flow by opening and closing the valve
according to a control signal from the heat pump control unit.
Refrigerant Channel Switching 3 Way Type Valve
INFOID:0000000010121750
• Refrigerant channel switching 3 way type valve is an electro-mag-
netic valve that is controlled by the heat pump control unit.
• Controls the refrigerant flow by switching the valve according to a
control signal from the heat pump control unit.
JMIIA2745ZZ
JMIIA2746ZZ
HAC-30
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
SYSTEM
SYSTEM
AUTOMATIC AIR CONDITIONING SYSTEM
AUTOMATIC AIR CONDITIONING SYSTEM : System Description
INFOID:0000000010121751
SYSTEM DIAGRAM
DESCRIPTION
JSIIA1774GB
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