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Operation Principle of Vacuum Modulator
Vacuum control
Atmospheric pressure
During duty increase (B)
Vacuum is controlled according to relationship between chamber pressure (I) in rolling nipple cover and magnetic
force (II) in plunger.
According to ECU signals, the solenoid valve controls the vacuum pressure that is generated by vacuum pump (-900
20 mbar) with PWM type control and drives the mechanical EGR valve and turbo charger.
EXHAUST SYSTEM
DI ENG SM - 2004.4
Vacuum pump
Air flow
During duty reduction (C)
Output vacuum
ATM
Plunger
Connector
Diaphragm
Seat assembly
Spring
Plunger
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DI04-31
Y220_04029
±
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