Control method and device for improving plateau power of engine and vehicle

The invention provides a control method and device for improving plateau power of an engine and a vehicle, belongs to the technical field of engines, and aims to at least solve the problem that when an existing vehicle runs on a plateau, the fuel injection quantity of the engine is directly reduced, so that a supercharging opening of a supercharger does not overheat, and consequently the power of the vehicle is insufficient. The control method for improving the plateau power of the engine comprises the steps that the air outlet temperature of a supercharging opening of a supercharger is obtained; and judging whether to increase any one or both of the main injection advance angle of the engine and reduce the opening degree of the throttle valve or not based on the exhaust temperature of the supercharging port and the exhaust temperature change rate of the supercharging port. Whether the main injection advance angle is increased or not is judged according to the air outlet temperature change rate of the pressur