Engine Electronic Control System (EECS) electronically controls engine ignition, fuel injection, air-to-fuel ratio, exhaust gas, etc., so that the engine works under the best working conditions, so as to improve its overall vehicle performance, save energy, The purpose of reducing exhaust emissions.
However, excessive exhaust gas participating in recirculation will affect the ignition performance of the mixture, thereby affecting the power performance of the engine, especially when the engine is idling, low speed, low load and cold, the recirculated exhaust gas will significantly affect the engine performance.