Infiniti G35 (V35) Sedan. Manual — part 743
HA-6
< FUNCTION DIAGNOSIS >
REFRIGERATION SYSTEM
1.
Refrigerant pressure sensor
2.
Liquid tank
3.
Condenser
4.
Compressor
JSIIA0127ZZ
REFRIGERATION SYSTEM
HA-7
< FUNCTION DIAGNOSIS >
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
Component Description
INFOID:0000000000959838
1.
Expansion valve
2.
Evaporator
3.
Blower motor
JSIIA0128ZZ
Component
Description
Compressor
Intakes, compresses, and discharges refrigerant, then conveys it to condenser.
Condenser
Condenses refrigerant, and then conveys it to liquid tank.
Liquid tank
Drives moisture out of refrigerant, eliminates foreign matter, then conveys refrigerant to expan-
sion valve.
Refrigerant pressure sensor
Refer to
HAC-92, "Component Inspection"
.
Expansion valve
Vaporizes refrigerant, controls the amount of flow, then conveys refrigerant to evaporator.
Evaporator
Cools passing air, and then conveys it to compressor.
Blower motor
Takes in air in the vehicle or fresh outside air, and then adjusts room temperature by air condi-
tioning.
HA-8
< FUNCTION DIAGNOSIS >
VARIABLE DISPLACEMENT COMPRESSOR SYSTEM
VARIABLE DISPLACEMENT COMPRESSOR SYSTEM
System Diagram
INFOID:0000000000959839
System Description
INFOID:0000000000959840
1.
The variable compressor provides refrigerant control under varying conditions. During cold winters, it may
not produce high refrigerant pressure discharge (compared to previous units) when used with air condi-
tioning systems.
2.
For air conditioning systems with the compressor, the clutch remains engaged unless: the system main
switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are low or when
the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.
DESCRIPTION
The variable compressor is a swash plate type that changes piston stroke in response to the required cooling
capacity.
The tilt of the swash plate allows the piston’s stroke to change so that refrigerant discharge continuously
change from approx. 0 to 171 cm
3
(0 to 10.4 cu in).
OPERATION
RJIA4209E
VARIABLE DISPLACEMENT COMPRESSOR SYSTEM
HA-9
< FUNCTION DIAGNOSIS >
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
Control Valve
• By changing high-pressure valve lift amount, built-in electronic control valve executes the following:
- Controls high-pressure valve discharge amount.
- Changes crankcase pressure in compressor.
- Changes angle of swash plate.
• Amount of high-pressure valve lift is determined by factors below.
- Low-pressure applied to diaphragm
- Spring load of set spring
- Balance of magnetic force generated in magnet coil
• Electronic control valve (ECV) magnet coil receives electric signal (duty control) from unified meter and A/C
amp. Then, magnetic force generated by electric current is changed to control high-pressure valve lift
amount.
Maximum Cooling
High-pressure valve is closed by magnetic force generated by electric signal sent from unified meter and A/C
amp. At this time, cylinder moves full stroke due to pressure balance between inside crankcase (Pc) and suc-
tion line (Ps).
Under this condition, the swash plate is set to the maximum stroke position.
Capacity Control
When no electric signal is sent from unified meter and A/C amp. (current: OFF), high-pressure valve is opened
by spring force.
Since suction pressure is low, it makes the suction port close and the discharge port open. Thus, crankcase
pressure becomes high as high-pressure enters the crankcase.
• The force acts around the link near the swash plate, and is generated by the pressure difference before and
behind the piston.
• The thrust flange and link are located where the piston generates the highest pressure. Piston pressure is
between suction pressure Ps and discharge pressure Pd, which is close to suction pressure Ps. If crankcase
pressure Pc rises due to capacity control, the force around the link makes the swash plate angle decrease
SJIA0547E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст