SsangYong Rexton. Service manual — part 54
DI04-29
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
EXHAUST SYSTEM
DI ENG SM - 2004.4
Y220_04026
Vacuum Modulator and Vacuum Hose
Below figures illustrate vacuum hoses and related parts of EGR or turbo where wrong or poor connection of vacuum hose
would display condition of engine irregularity and defect diagnostic codes on the scan tool.
Related with EGR valve
Y220_04027
Related with turbo charger actuator
EGR valve
From vacuum pump
Vacuum modulator for
EGR valve control
Turbo charger pressure valve
Vacuum modulator for turbo
charger booster control
From vacuum pump
DI04-30
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
EXHAUST SYSTEM
DI ENG SM - 2004.4
EGR System Diagram
EGR Valve
EGR valve recirculates some of exhaust gases to intake system to reduce toxic NOx from engine according to ECU
signals.
• EGR valve opening point : -270 mmHg
EGR Modulator
According to ECU signals, the vacuum modulator drives EGR valve by controlling vacuum pressure that is generated by
vacuum pump with PWM type controls.
Y220_04028
Intercooler
Exhaust
manifold
Intake
manifold
EGR
valve
Regulated
vacuum
pressure
Modulator
Vacuum
pump
Duty
control
Feedback EGR
(Air Mass)
ECU
Improved target EGR
Air intake signal
(for EGR feed-
back control)
Turbo charger
Pedal
signal
RPM
signal
DI04-31
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
EXHAUST SYSTEM
DI ENG SM - 2004.4
Y220_04029
Operation Principle of Vacuum Modulator
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.
Vacuum pump
Output vacuum
ATM
Plunger
Connector
Diaphragm
Vacuum control
Seat assembly
Spring
Atmospheric pressure
Plunger
Air flow
During duty increase (B)
During duty reduction (C)
Vacuum is controlled according to relationship between chamber pressure (I) in rolling nipple cover and magnetic
force (II) in plunger.
DI04-32
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
EXHAUST SYSTEM
DI ENG SM - 2004.4
Y220_04032
Y220_04031
Y220_04030
Operating principle: Balance between original vacuum pressure and magnetic force (see above figure)
• Normal state (Fig. A): Original vacuum and seat section, 3 stoppers keep sealing
• Duty up state (Fig. B): Original vacuum pressure is connected to inside of diaphragm chamber
• Duty down state (Fig. C): Increased diaphragm chamber pressure is connected to atmosphere to compensate the
pressure.
Operating principles when duty is applied from 0 to 50 %
Vacuum consumption: Compared to 50 % of duty, ON/OFF periods are most unstable and vacuum
consumption is most high.
Output Characteristics
Floating plunger
DUTY 50%
Output C/V
Stroke
(mm)
Max. Distance
1mm
Flowing
volume
Output vacuum (-mmHg)
Up
Down
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст