Auxiliary engine power system of pure electric vehicle and control method of auxiliary engine power system

The invention provides an auxiliary engine power system of a pure electric vehicle. The auxiliary engine power system comprises a driving motor, a full vehicle controller as well as a power battery, a motor controller, a power distribution mechanism, an air compression system and a power-assisted steering system which are connected with the full vehicle controller, wherein the power battery is connected with the motor controller and the drive motor sequentially; the driving motor is connected with the air compression system, the power-assisted steering system and a vehicle axle through the power distribution mechanism. Demands for two power sources (namely, motors) and corresponding power distribution components in the air compression system and the power-assisted steering system are reduced, a single power source is adopted, a controllable one-driving-three power allocation mode is realized, the system cost is greatly saved, and the electromagnetic interference influence of a full vehicle high-voltage system on a low-voltage system is reduced; the auxiliary engine power system is simple in structure and convenient to arrange, the arrangement space of the full vehicle is saved, energy loss caused when electric energy is converted into power is reduced, the system efficiency is greatly improved, system components are reduced, and the error-tolerance rate and the reliability of the system are increased.