1-7
EGR valve
• To correspond to the automobile exhaust gas regulations of 2005, the computerized double-seated
valve linear solenoid type of EGR valve was adopted.
• The computerized double-seated valve linear solenoid type of EGR valve was adopted in order to
improve accuracy in adjustment and to reduce particulates and Nox altogether.
• By adopting the EGR valve lift sensor and giving feedback of the EGR valve opening degree to the
engine ECU, EGR can be controlled optimally.
Operation of EGR valve
• In order to improve the performance of purifying the exhaust emission by EGR, feedback is controlled
by the EGR valve opening degree to adjust the oxygen density in the intake-air that changes by EGR to
the applicable target value for engine conditions (engine speed, supercharging pressure, temperatures
of each section, load, intake-air volume).
• In order to expand the EGR area, the EGR volume is controlled by the valve opening degree with the lift
sensor, based on the intake-air valve opening degree and the variable nozzle turbo opening degree that
have been setup in advance.
Cooling water flow
EGR cooler
Engine
Cooling water
Exhaust
manifold
Gas flow
EGR valve lift sensor
Linear solenoid
actuator
Gas inlet
Gas outlet
Linear solenoid type
actuator
EGR valve lift sensor
J05D example
Engine ECU
Engine speed
Accelerator opening
Intake pressure, air pressure
Cooling water temperature
Intake-air volume
