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What is the function of the Exhaust Gas Recirculation system?

1 Answers

McJeremiah

07/29/25 8:40pm

Exhaust Gas Recirculation (EGR) primarily serves to reduce nitrogen oxides in the exhaust gases and can improve fuel economy under partial load conditions. There are various forms and control methods for the EGR system. Based on the actuation control method of the system's actuator (EGR valve), it can be categorized into mechanically controlled EGR systems and electronically controlled EGR systems. According to the control object of the EGR valve, it can be divided into directly controlled EGR systems and indirectly controlled EGR systems. Below is relevant information about Exhaust Gas Recirculation: 1. Introduction to Exhaust Gas Recirculation: Exhaust Gas Recirculation is a technology (or method) used in small internal combustion engines for automobiles, where a portion of the exhaust gases is recirculated and reintroduced into the intake side after combustion. The main objectives are to reduce nitrogen oxides (NOx) in the exhaust gases and to enhance fuel economy under partial load conditions. It is commonly referred to by the acronym 'EGR', derived from the initial letters of each English word. 2. Types of EGR Systems: Mechanically controlled EGR system, Electronically controlled EGR system, Directly controlled EGR system, Indirectly controlled EGR system, Single-valve controlled EGR system, Multi-valve controlled EGR system, Open-loop controlled EGR system, Closed-loop controlled EGR system.

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