What is the function of the exhaust gas valve?
1 Answers
Automobile exhaust gas valve is used to allow the exhaust gas to re-enter the cylinder for combustion again. The following is the relevant information about the automobile exhaust gas valve: 1. The automobile exhaust gas valve, also known as the oil-gas separator or oil-water separator, is designed to handle the gases that escape from the combustion chamber into the crankcase during ignition. As these gases accumulate, they need to be managed to prevent excessive pressure and avoid releasing them into the atmosphere, which would cause pollution. Therefore, these gases are redirected back into the intake system for reuse. In some vehicles, the intake port is located before the throttle valve, while in others, it is situated on the intake manifold after the throttle valve. 2. A small portion of the exhaust gas helps to lower the temperature inside the cylinder during combustion. Since NOX is generated under high-temperature and oxygen-rich conditions, this process inhibits the formation of NOX, thereby reducing its content in the exhaust gas. The engine control unit (ECU) regulates the opening of the electromagnetic valve based on factors such as engine speed, load (throttle opening), temperature, intake airflow, and exhaust temperature. The vacuum from the intake pipe passes through the electromagnetic valve into the vacuum chamber of the EGR valve, causing the membrane rod to open the EGR valve. A small portion of the exhaust gas then enters the intake system through the EGR valve, mixes with the air-fuel mixture, and enters the cylinder for combustion. 3. When the engine is idling, running at low speed, under light load, or during cold starts, the ECU prevents exhaust gas from participating in the recirculation to avoid affecting engine performance. However, when the engine exceeds a certain speed, load, or reaches a specific temperature, the ECU allows a small portion of the exhaust gas to participate in recirculation. The amount of exhaust gas involved in recirculation varies depending on the engine speed, load, temperature, and exhaust gas temperature to minimize the NOX content in the exhaust gas.
