Four wheel steering device for vehicle

Abstract

Abstract PURPOSE:To improve safety without need for paying special attention at the time of changing over a mode by carrying out the changeover from a steering ratio characteristic selected by a selecting means to another steering ratio characteristic only in a mutually overlapped zone. CONSTITUTION:A rack 12 is formed on a rear wheel operation rod 11 and rotated by means of a pulse motor 14 via a pinion shaft 17 to steer rear wheels 8L, 8R. And, the pulse motor 14 and the driving motor 24 of a hydraulic pump 23 are controlled by control signals outputted from a controller 24. Signals from a steering sensor 26 and a vehicle speed sensor 27 are inputted into the controller 25, which is connected to a selecting switch 28 through a relay. And, the controller 25 has a characteristic selecting part as a selecting means for selecting one out of steering ratio characteristics stored in a characteristic memory part by operating the switch 28, to carry out the operation of a target steering angle in accordance with the steering ratio characteristic.

Inventors

• 👤 Yoshiaki Anami
• 👤 義明 阿南
• 👤 Takashi Nakajima
• 👤 隆志 中島

Bibliographic Details