Self-cleaning EGR valve and control method thereof

The invention relates to a self-cleaning EGR valve and a control method thereof.The self-cleaning EGR valve comprises a valve body, a one-way valve is arranged between the valve body and an EGR cooler, a lifting valve and a nozzle are arranged on the valve body, and the nozzle is connected with an air cylinder; and a butterfly valve is arranged in the valve body channel. The purging/drying/filtering device is independently arranged, the state of the engine is recognized through the EECU, the EECU controls the exhaust control valve and the one-way valve to be opened for a certain time when the engine enters the idling/shutdown link, compressed gas is used for purging a pipeline and a valve plate, residual waste gas, impurities and water are exhausted out of the pipeline, and clamping stagnation and failure caused by rusting and carbon deposition of the pipeline and the valve plate are avoided. 本发明涉及一种自清洁EGR阀及其控制方法，该自清洁EGR阀，包括阀体，阀体与EGR冷却器之间设有单向阀，阀体上设有提升阀和喷嘴，喷嘴与储气筒相连；阀体通道内设有蝶阀。本发明通过单独设置吹扫/干燥/过滤装置，通过EECU识别发动机状态，当