What is the working principle of the EGR valve?

1 Answers
CarterDella
07/30/25 10:18am
The working principle of the EGR valve is: to control the amount of exhaust gas flowing back from the exhaust manifold to the intake manifold through three metering holes with increasing diameters, thereby producing seven different flow rate combinations. Each metering hole consists of a solenoid valve and a needle valve. When the solenoid valve is energized, the armature is magnetically pulled upward, opening the metering hole. The characteristics of the rotary needle valve ensure good sealing when the EGR valve is closed. The task of the EGR valve system is to optimize the recirculation amount of exhaust gas at each operating point, keeping the combustion process in an ideal state and minimizing the pollutant components in the emissions.
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