摘要：【中文】本发明公开了一种发动机EGR阀开度的控制方法及系统，发动机废气循环系统包括第二管路和第一管路，第一管路上设置有EGR阀，方法包括：在EGR阀压力传感器处于故障状态时，获取发动机的第二管路的第一压力值；将第一压力值与第一预设值进行比较；当第一压力值不小于第一预设值时，获取空气滤清器下游的第二压力值，将第二压力值记为EGR阀下游的预估压力值；当第一压力值小于第一预设值时，确定节流阀下游的压力值，将节流阀下游的压力值，记为所述EGR阀下游的预估压力值；本发明根据所述节流阀的状态和所述节流阀上游的压力值，确定EGR阀下游的压力值，确保EGR阀对发动机控制器的指令做出正确的响应，改善整车的性能。 【EN】The invention discloses a method and a system for controlling the opening of an EGR valve of an engine, wherein an engine exhaust gas circulating system comprises a second pipeline and a first pipeline, the first pipeline is provided with the EGR valve, and the method comprises the following steps: when the EGR valve pressure sensor is in a fault state, acquiring a first pressure value of a second pipeline of the engine; comparing the first pressure value with a first preset value; when the first pressure value is not smaller than the first preset value, acquiring a second pressure value at the downstream of the air filter, and recording the second pressure value as an estimated pressure value at the downstream of the EGR valve; when the first pressure value is smaller than a first preset value, determining a pressure value at the downstream of the throttle valve, and recording the pressure value at the downstream of the throttle valve as an estimated pressure value at the downstream of the EGR valve; according to the state of the throttle valve and the pressure value of the upstream of the throttle valve, the pressure value of the downstream of the EGR valve is determined, the correct response of the EGR valve to the instruction of an engine controller is ensured, and the performance of the whole vehicle is improved.