Speed switching system of electric vehicle electric power steering (EPS) system

The invention provides a speed switching system of an electric vehicle electric power steering (EPS) system and belongs to the field of electric vehicles. The speed switching system comprises an engine rotating speed signal generating circuit, a wheel speed sensor, a speed signal generating circuit, an engine rotating speed signal driving circuit and a speed signal driving circuit. The engine rotating speed signal generating circuit sends a simulative engine rotating speed signal to the engine rotating speed signal driving circuit when receiving an 'START' gear signal provided by a steering lock. The speed signal generating circuit obtains a speed signal and sends the speed signal to the speed signal driving circuit according to a wheel speed signal provided by the wheel speed sensor. The engine rotating speed signal driving circuit and the speed signal driving circuit respectively convert the engine rotating speed signal and the speed signal into pulses and send the pulses to the EPS system. The speed switch