The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Oct. 21, 1988
Takeshi Ohe, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A four-wheel steering system includes a torque sensor, a first steering angle sensor, a vehicle speed sensor, a second steering angle sensor, a first DC motor, a second DC motor, and a controller. The torque sensor outputs a front-wheel steering force signal. The first steering angle sensor outputs a front-wheel steering angle signal. The vehicle speed sensor outputs a vehicle speed signal. The second steering angle sensor outputs a rear-wheel steering angle signal. The first DC motor supplies a torque to a front-wheel steering system. The second DC motor supplies a torque to a rear-wheel steering system. The controller outputs a rear-wheel steering force signal by detecting a current supplied to the second DC motor, and determines a control target value by receiving the front- and rear-wheel steering force signals and the front- and rear-wheel angle signals, and the vehicle speed signal.