Control method and device for improving closed-ring ability of constant rotating speed of diesel engine

The invention discloses a control method for improving the closed-ring ability of the constant rotating speed of a diesel engine and relates to the constant rotating speed of the diesel engine. The method mainly solves the technical problems that an existing PI closed-ring method cannot meet the requirements of constant rotating speed control of the diesel engine for transient state response timeand rotating speed overstrike rate easily. The control method comprises the steps that the actual rotating speed B of the diesel engine is obtained; PI closed-ring control is carried out according toa difference value of an idling target setting value A and the actual rotating speed B to obtain idling closed-ring torque E, the rotating speed change acceleration C is calculated and obtained according to the actual rotating speed B, and pre-control torque curve is inquired according to the rotating speed change acceleration C to obtain pre-control torque D; and the pre-control torque D is compensated to idling closed-ri