How does the EGR solenoid valve work?
2 Answers
EGR solenoid valve works as follows: When the electromagnetic coil of the EGR control solenoid valve is energized, the atmospheric vent port closes, and the intake manifold connects with the EGR valve vacuum chamber; When the electromagnetic coil of the EGR control solenoid valve is not energized, the valve core moves downward, the vacuum passage is cut off, and at this time the atmospheric vent port opens, the EGR valve vacuum chamber will connect with the atmosphere. The following is the related content introduction: The function of the EGR valve is to redirect the exhaust gas from the engine combustion back to the intake manifold to participate in combustion again, reducing the combustion chamber temperature and improving engine efficiency, thus optimizing the combustion environment. It also reduces nitrogen oxide emissions, minimizes knocking, and extends the engine's service life.
I found the working principle of the EGR solenoid valve quite interesting while driving. It is installed near the engine, and the vehicle's computer sends signals to the solenoid coil based on engine load. When energized, the coil generates a magnetic field that pulls the valve core to open the channel, allowing some exhaust gas to recirculate into the intake manifold, reducing combustion temperature and nitrogen oxide emissions. When de-energized, the spring pushes the valve back to close it. If this thing doesn't work, the car will show a fault light or experience power loss—I once encountered a blockage issue that caused the vehicle to shake. Regularly cleaning carbon deposits can prevent faults, keeping the car environmentally compliant and fuel-efficient. While driving, avoiding sudden throttle inputs can extend its lifespan, as smooth engine operation leads to better overall performance.
