Emission Gas Recirculation System Overview
An exhaust gas recirculation (EGR) system refers to the process of introducing exhaust gases from the engine back into the vehicle engine for combustion. EGR reduces nitrogen oxide emissions and improves combustion efficiency, thus achieving energy conservation and emission reduction.
An EGR system consists of components such as the exhaust pipe, exhaust gas cooler, and EGR valve. The EGR valve is the core component of the entire system.
Function of the EGR Valve
The EGR valve primarily controls the amount of air entering and leaving the EGR system to control nitrogen oxide emissions. The EGR valve controls the amount of exhaust gas recirculated based on signals such as engine load, speed, and coolant temperature.
What does it mean when the exhaust gas recirculation valve is open?
An open EGR valve means that the EGR valve has lost its signal input or the control signal has not reached the valve body. In this case, the EGR valve cannot control the airflow, causing the EGR system to malfunction and polluting the environment. Troubleshooting an Open Exhaust Gas Recirculation Valve
When the exhaust gas recirculation valve is open, the fault needs to be rectified as soon as possible to ensure the normal operation of the exhaust gas recirculation system. Generally, an open exhaust gas recirculation valve may be caused by damage to the internal structure of the valve body or a fault in the control signal circuit. The problem needs to be resolved by inspecting and replacing the relevant components.
