Specifications

Section 3
The Variable Capacity swash-plate compressor uses a solenoid control
v
alve
t
hat opens and closes to adjust the low-pressure inlet to the
compressor. Controlling the suction side of the compressor changes the
volume capacity according to the cooling load of the A/C system. This
change in pressure affects the swash-plate angle. It also changes the piston
stroke and thus the amount of refrigerant discharged to the condenser.
Controlling the compressor volume in this manner improves A/C
perform
ance and energy savings.
3-8
TOYOTA Technical Training
Variable Capacity
Compressor and
Solenoid Valve
Variable stroke of pistons.
Heat Load: Lar
ge
Heat Load: Small
Solenoid Control Valve
Solenoid Control Valve
Low Pressure: High
Low Pressure: Low
Internal Pr
essure of
Swash-Plate
Chamber: Low
Inter
nal Pressure of
Swash-Plate
Chamber: High
Swash-Plate Angle: Large
Piston Stroke: Large
Cooling Performance: Lar
ge
Swash-Plate Angle: Small
Piston Stroke: Small
Cooling Performance: Small
Shaft
Lug Plate
Piston
Cylinder
Swash-Plate
Solenoid Control
Valve
Piston
Shoe
Crank Chamber
Fig. 3-8
752f308
Fig. 3-9
752f309
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