Integrated power steering system for front and rear wheels of vehicle and control method thereof

Abstract

A power steering system of a vehicle and a control method are provided. The integrated power steering system reduces the number of components, manufacturing costs, and power loss of a vehicle using components together, such as a hydraulic pump, a controller, and a control valve, used in an emergency steering system and a rear wheel steering system. The system includes a main hydraulic motor that receives engine power and generates a hydraulic pressure and an auxiliary hydraulic motor that generates a hydraulic pressure. A front wheel steering cylinder receives hydraulic pressure and generates power for steering front wheels and auxiliary steering of a driver and a rear wheel steering cylinder receives hydraulic pressure and generates power for steering rear wheels. An integrated control valve is connected to the hydraulic motors and the steering cylinders through hydraulic pressure pipelines, and adjusts the hydraulic pressure generated by a main hydraulic motor to supply the pressure to the front wheel steering cylinder and adjusts the hydraulic pressure generated by the auxiliary hydraulic motor to supply the pressure to the front wheel steering cylinder or the rear wheel steering cylinder. A controller operates the auxiliary hydraulic motor and the integrated control valve to supply the hydraulic pressure generated by the main hydraulic motor to the front wheel steering cylinder and the hydraulic pressure generated by the auxiliary hydraulic motor to the front wheel steering cylinder or the rear wheel steering cylinder when the steering wheel is manipulated.

Dependencies are inferred from the claim text.