Speed conversion device of electric vehicle EPS (Electric Power Storage) system

The utility model provides a speed conversion device of an electric vehicle EPS (Electric Power Storage) system, belonging to the field of electric vehicles. The device comprises an engine rotating speed signal generating circuit, a wheel speed sensor, a speed signal generating circuit, an engine rotating speed signal drive circuit and a speed signal drive circuit, wherein the engine rotating speed signal generating circuit sends an analog engine rotating speed signal to the engine rotating speed signal drive circuit when receiving a 'START' gear signal provided by a steering lock; the speed signal generating circuit obtains a speed signal according to a wheel speed signal provided by the wheel speed sensor and sends the speed signal to the speed signal drive circuit; the engine rotating speed signal drive circuit and the speed signal drive circuit respectively convert the engine rotating speed signal and the speed signal into pulse forms and send the engine rotating speed signal and the speed signal to the E