2019年10月3日 · The EGR valve is normally closed. There is no EGR flow when the engine is cold, at idle, or during hard acceleration. The EGR flow is at its peak during steady cruising under moderate load. In some cars, the EGR valve is operated by a vacuum actuator, as in the first diagram below. Modern cars have an electric EGR valve with a step motor.

Vacuum operated EGR valves use a vacuum solenoid to vary the vacuum to the diaphragm and, in turn, open and close the EGR. Some valves also include a feedback sensor to inform the ECU of the valves position. Digital EGR valves feature a solenoid or stepper motor and, in most cases, a feedback sensor. These valves receive a pulse width modulated ...

EGR valve the top of box on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NO x) emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines. [1] EGR works by recirculating a portion of an engine's exhaust gas back to …

2025年3月11日 · The EGR (Exhaust Gas Recirculation) valve is a component of the internal combustion engine that helps reduce nitrogen oxide (NOx) emissions. By recirculating part of the exhaust gas back into the intake manifold, it reduces combustion temperatures and improves efficiency. 2. How does an EGR valve work?

2020年9月19日 · The EGR valve — which works differently depending on how old the car is and whether it uses gasoline or diesel fuel — is a key component to a car’s exhaust system and engine health. Related ...

How Does EGR Work? EGR works by routing, cooling and feeding a controlled amount of exhaust gas created during combustion back into an engine’s intake air system. This process dilutes the air and fuel mixture that enters the combustion chambers, which reduces the engine's peak combustion temperature. The lower temperature means less NOx is ...

Low pressure EGR vs. high pressure EGR: Advantages: Disadvantages: has natural pressure difference between exhaust and intake manifolds, which allows the exhaust gas to flow; allows conservation of the exhaust gas energy before entering the turbine; more suitable be used at full engine load; generates better exhaust gas-air mix before entering ...

2021年8月18日 · How Does the EGR Valve Work? The EGR valve operates by opening and closing to control the flow of exhaust gases into the engine’s intake manifold. There are two main types of EGR valves: vacuum-operated and electronically controlled. While both types serve the same purpose, their mechanisms differ slightly.

2024年6月6日 · What is an Exhaust Gas Recirculation (EGR)? The exhaust gas recirculation system is a technology employed in internal combustion engines to reduce harmful emissions. The exhaust gas recirculation function happens by diverting a portion of exhaust gasses back into the engine’s combustion chamber where they mix with the incoming air-fuel mixture.

2025年2月26日 · The EGR system has evolved significantly over the years, adapting to stricter emissions regulations and advancements in engine technology. Components of the EGR System. The EGR system consists of several key components that work together seamlessly. Understanding these parts is crucial for effective troubleshooting and maintenance.