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:
Mar. 30, 2010
Filed:
Aug. 30, 2007
Bernard Hublart, Beauvais, FR;
Cedric Deman, Savignies, FR;
Malcolm Shute, St. Germain la Poterie, FR;
Vince Chauvel, St. Gilles, FR;
Bernard Hublart, Beauvais, FR;
Cedric Deman, Savignies, FR;
Malcolm Shute, St. Germain la Poterie, FR;
Vince Chauvel, St. Gilles, FR;
AGCO SA, Beauvais, FR;
Abstract
A vehicle steer by wire system which has a steering wheel for setting a desired turn angle of a vehicle wheel, a steering wheel turn sensor for sensing the desired turn angle, a hydraulic steering actuator for turning the wheel, a wheel turn sensor for sensing the current wheel turn angle and a control unit for receiving the desired turn angle and current wheel turn angle signals. An electronically controlled steering actuator control valve means is provided for supplying pressurized fluid to the steering actuator via a steering circuit in response to signals from the control unit to turn the wheel to the desired turn angle. A hydraulic motor connected with the steering wheel is provided to provide steering feedback to the steering wheel via a feedback circuit which includes an electrically controlled hydraulic feedback control valve means which directs fluid to and from the hydraulic motor in response to the signals from the control unit to generate the steering feedback. The steering system has a fail-safe mode in which fluid pressure from the hydraulic motor provides steering of the wheel in the event of a failure to electronically actuate the steering actuator control valve means.