What is the function of the Exhaust Gas Recirculation system?
2 Answers
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.
As someone who cares about the environment, the Exhaust Gas Recirculation system, which I abbreviate as EGR, is quite crucial for reducing air pollution. Its main function is to take a portion of the exhaust gas and recirculate it back into the engine to mix and burn again, which helps lower the combustion temperature and prevents the emission of harmful nitrogen oxides. This is especially important when driving in big cities, reducing the impact of smoke and dust on the respiratory system. Moreover, it can slightly improve fuel efficiency, saving money while being eco-friendly. I remember driving an old car a few years ago that didn’t have an EGR system, and the emissions were way over the limit. Nowadays, new cars come with it as standard, making driving much more reassuring. However, if the EGR system isn’t maintained properly, carbon buildup can clog it, affecting its performance. It’s recommended to perform regular maintenance and not overlook emission issues. Overall, it’s an innovation that benefits both the environment and regulations—a win-win.
