The structure and working principle of EGR system
The exhaust gas recirculation system, or EGR, is composed of EGR valve, EGR vacuum control valve, EGR control solenoid valve, controller (ECM/PCM) and EGR valve lift sensor, as shown in Figure
1. The EGR system and the three-way catalyst cooperate to effectively reduce the NOx production in the exhaust pollutant gas. Since NOx generation is on conditions of high temperature and polyoxygen, EGR only operates in the following situations.
① At low speed, when the water temperature is lower than 50 ℃, the exhaust gas does not circulate to prevent the occurrence of stall;
② At high speed and medium load, the conditions for producing NOx are generally available, and the waste gas valve is put into operation to control the pollution value of NOx emissions.
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Most Common EGR Valve
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