Role and impact of the EGR valve

1. What is the EGR valve

The EGR valve is a product installed on a diesel engine to control the amount of exhaust gas recirculation fed back to the intake system. It is usually located on the right side of the intake manifold, near the throttle, and is connected by a short metal pipe leading to the exhaust manifold.

The EGR valve reduces the temperature of the combustion chamber by guiding the exhaust gas to the intake manifold to participate in the combustion, improve the working efficiency of the engine, improve the combustion environment, and reduce the burden of the engine, effectively reduce the emission of NO compounds, reduce knock, and extend the service life of each component. Car exhaust gas is a non-combustible gas that does not participate in combustion in the combustion chamber. It reduces the combustion temperature and pressure by absorbing part of the heat generated by the combustion to reduce the amount of nitrogen oxide produced.

2. What does the EGR valve do

The function of the EGR valve is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of waste gas flows into the intake manifold for recirculation.

When the engine running under load, EGR valve open, timely, appropriate to part of the exhaust gas again into the cylinder, because the main components of exhaust gas CO2 than heat capacity is larger, so the exhaust gas can be part of the heat generated by combustion and take out of the cylinder, and the mixture, thus reduce the engine combustion temperature and oxygen content, thus reducing the amount of NOx compounds.

3.Effect of EGR valve card lag

 Emision Standards VI engine sets a position sensor or exhaust gas temperature sensor or pressure sensor at the EGR valve to conduct closed-loop correction and feedback control for the actual exhaust gas recirculation amount. According to the actual working conditions of the engine and the changes of the working conditions, it can automatically adjust the amount of exhaust gas involved in the recycling.

If the EGR valve jammed, the actual amount of exhaust gas into the intake manifold will be uncontrollable.

Excessive exhaust gas recirculation will affect the normal work of the engine, have a serious impact on the performance of the engine, and affect the power output of the engine, leading to the lack of engine power. Too little waste gas in the circulation will affect the temperature of the engine combustion chamber, increasing the emission of NO compounds, resulting in emissions are not up to the standard, resulting in the engine limit torsion.


Post time: May-09-2024