Relationship between egr valve and throttle valve

Egr valve and throttle valve are in a coordinated relationship. There is no direct mechanical connection between egr valve and throttle valve, but they are controlled by engine control module (ECM) to optimize the combustion efficiency and emission performance of the engine. Specifically, the opening and closing of egr valve will affect the gas pressure and temperature in the combustion chamber of the engine, and then affect the opening of the throttle valve, thus adjusting the air intake and fuel consumption of the engine. Therefore, although egr valve and throttle valve are not directly connected, they play a coordinating role in engine control to improve engine performance and emission level.