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A/C Compressor
 
 
COMPONENT FUNCTION WITHIN SYSTEM
IPDM E/R controls the magnetic clutch and ECV (electrical control valve) according to the requests from the A/C amp. and ECM, and changes the A/C compressor drive and refrigerant discharge amount.
 
 
INDIVIDUAL COMPONENT FUNCTION
For controlling the A/C compressor, a magnetic clutch that drives the A/C compressor is used, together with an ECV that changes the refrigerant discharge amount.
 
 
Magnetic Clutch
The magnetic clutch turns ON/OFF, transmitting the rotational motion of the engine to the A/C compressor.
 
 
ECV (Electrical Control Valve)
Changing the cam plate angle, it changes the piston stroke and controls the refrigerant discharge amount.
 
 
COMPONENT OPERATION
 
 
Magnetic Clutch
  • Magnetic clutch consists of pulley, clutch disc, and field coil.
    • Pulley is connected with crankshaft pulley of engine via drive belt and is always rotated while engine is running.
    • Clutch disc is connected with drive shaft of A/C compressor.
    • Field coil, which becomes a strong electric magnet when electricity is supplied, strongly pulls clutch disc and presses it to pulley.
  • When smart FET integrated in IPDM E/R turns ON, electricity is supplied to field coil, clutch disc is presses to pulley, and engine rotational movement is transmitted from crankshaft pulley ⇒ drive belt ⇒ pulley ⇒ clutch disc ⇒ drive shaft. A/C compressor is operated. When smart FET turns OFF, electricity is not supplied to field coil, and clutch disc is released from pulley. A/C compressor is not operated.
 
 
ECV (Electrical Control Valve)
  • ECV (Electrical Control Valve) is integrated in the A/C compressor. IPDM E/R receives the ECV control signal from A/C amp. via CAN communication, and ECV is controlled according to the control signal transmitted from IPDM E/R.
  • ECV is controlled according to the control signal transmitted from IPDM E/R.
    The control signal transmitted by IPDM E/R is controlled according to the ECV control signal transmitted from A/C amp. via CAN communication.
  • ECV varies the air pressure balance in the left and right air spaces that are divided by the cam plate in order to change the angle of the cam plate inside the A/C compressor.
    By changing the cam plate angle, it changes the piston stroke and controls the refrigerant discharge amount.
 
 
COMPONENT PARTS LOCATION
The A/C compressor is installed to the engine.
Refer to Component Parts Location.