EGR compensation control method and device of engine system and vehicle

The invention discloses an EGR compensation control method and device for an engine system and a vehicle, and the method comprises the steps: obtaining a target EGR rate and an actual EGR rate of the EGR system in real time in the operation process of an engine; whether the difference value between the target EGR rate and the actual EGR rate is larger than a preset EGR rate difference value or not is judged; if yes, the current opening degree of the EGR valve is obtained; whether the current opening degree of the EGR valve reaches a first preset opening degree or not is judged; if yes, the closed-loop control state of a supercharger, the closed-loop control state of EGR and the opening degree of a waste gas bypass valve are obtained; the opening degree of the throttle valve and the opening degree of the waste gas bypass valve are adjusted at least according to the closed-loop control state of the supercharger, the closed-loop control state of the EGR and the opening degree of the waste gas bypass valve, and i