The variable
displacement compressor has a swash plate that rotates to reciprocate
pistons, which compresses refrigerant. The variable displacement
compressor change the swash plate angle to change the refrigerant
displacement.
The externally controlled type variable displacement
compressor changes the swash plate angle in accordance with an
electrical signal from an electric control unit.
DENSO’s externally controlled variable displacement
compressor manages displacement by controlling refrigerant differential
pressure before and after a throttle at the discharge side; achieving
precise cooling capability control in accordance with cabin environment
and driving conditions.
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DENSO Technology – Leading the World
- DENSO developed the world’s first technology
that controls refrigerant displacement from almost zero percent to 100
percent. Using this technology, in 1997, DENSO launched the world’s
first externally controlled variable displacement compressor with a
damper limiter (DL) pulley, instead of a magnetic clutch, making the
compressor smaller, lighter and more reliable.
- In 2001, DENSO launched the world’s first externally
controlled variable displacement compressor with an electromagnetic
control valve that controls refrigerant differential pressure before and
after a throttle at the discharge side, in accordance with an electric
signal from the engine ECU or air conditioner ECU. By controlling
refrigerant discharge pressure rather than refrigerant suction pressure,
the engine torque used for the compressor can be estimated. This allows
the compressor to be controlled in connection with engine management to
reduce fuel consumption.
- In 2001, DENSO launched an even lighter variable displacement compressor with a resin-made DL pulley.
- In 2003, DENSO launched the world’s first
externally controlled variable displacement compressor with a rotary
valve as a suction valve, instead of a conventional lead valve plate.
This improved compressor efficiency by approximately 10 percent.
Benefits and Features
- Small size and light weight
- The externally controlled variable
displacement compressor (5SER09) with resin-made DL pulley achieves the
world’s lightest weight for equivalent displacement compressors.
DENSO improved the housing to have a thinner
wall while maintaining its strength, contributing to a smaller and
lighter compressor.
- High compressor efficiency
- The world’s first rotary valve reduces
pressure drop of refrigerant gas drawn into compression chambers, and
prevents heating of the refrigerant gas. This enables the compressor to
draw a larger amount of refrigerant into the compressing chambers,
increasing compressor efficiency by approximately 10 percent when
compared to a conventional compressor.
- Precisely controllable in connection with engine management
- Using DENSO-developed electromagnetic
control valve, refrigerant displacement is controlled in accordance with
the amplitude of engine torque used for the compressor. This maximizes
engine efficiency.
- Low noise and vibration
- The rotary valve and the housing’s muffler
structure significantly reduce the pulsation of refrigerant gas pulled
into the compression chambers.
- High reliability
- The pistons are hollow, enabling the
compressor to control refrigerant displacement at a maximum of 11,000
revolutions per minute, at high engine speed. This prevents the pistons
from disturbing the swash plate inclination control even at the high
engine speed.
DENSO’s Latest Model (5SER09) Structure
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