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What is the principle of the EGR valve?

2 Answers

Bustamante

07/24/25 1:17am

EGR valve is the exhaust gas recirculation valve, a mechatronic product installed on diesel engines to control the amount of exhaust gas recirculated back into the intake system. Its working principle is as follows: 1. The EGR valve stem rises, pushing the connected sliding contact arm to change position, causing the sliding contact to move along the sliding resistor, generating different voltage signals. These signals are transmitted to the engine control ECU, which monitors the position of the EGR valve to ensure the valve responds correctly to ECU commands. This adjusts and corrects the opening timing and duty cycle of the EGR valve, precisely controlling the recirculation volume to reduce emissions and improve performance. 2. EGR stands for Exhaust Gas Recirculation system, and the EGR valve is a key control component in the entire EGR system. The EGR valve is installed on the intake pipe. Exhaust gas recirculation (EGR valve) introduces exhaust gas into the intake pipe, reducing the oxygen content in the intake air, thereby lowering combustion temperature and reducing nitrogen oxide emissions.

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MaciLee

08/10/25 8:55pm

I've repaired quite a few cars, and the principle of the EGR valve is actually a clever use of exhaust gases to control engine temperature. Simply put, it installs a valve on the exhaust pipe to redirect some of the burned exhaust gases back into the intake pipe, mixing them with fresh air and fuel. When the engine runs at high speed or under heavy load, the EGR valve opens, and the exhaust gases dilute the oxygen concentration, which lowers the combustion chamber temperature a bit, reducing the formation of nitrogen oxides—those are really harmful! This design is based on thermodynamic principles: at high temperatures, inert gases in the exhaust, like carbon dioxide and water vapor, can absorb heat, similar to using a fan to cool down in summer. During everyday driving, the ECU (Engine Control Unit) automatically manages the EGR valve's operation. If you notice your car shaking or lacking power during acceleration, it might be due to carbon buildup clogging the EGR valve; cleaning the valve body is crucial, and generally, checking it every 20,000–30,000 kilometers can prevent major issues. The benefit is environmental—it helps the car meet emission standards. In short, understanding it has made me pay more attention to maintenance; a small part plays a big role!

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