Supercharger axial thrust overrun protection calibration method

The invention relates to the technical field of automobile industry, engine turbochargers and engine electric control calibration, and discloses a supercharger axial thrust overrun protection calibration method which comprises the following steps: establishing a calibration pressure model; establishing a relationship between a supercharger before-vortex pressure model value P3mod and a supercharger after-vortex pressure P4 measured value; a supercharger P3-P2 difference protection strategy is achieved, the transient maximum position of the supercharger is limited by calibrating the ratio of the engine P3 to the engine P2, and then the transient P3-P2 overrun problem is limited. By means of the supercharger axial thrust overrun protection calibration method, the pressure difference value of the supercharger P3-P2 can be kept within the allowable range of the supercharger all the time, the limit value of the axial thrust of the supercharger is achieved, and therefore a thrust bearing of the supercharger is prot