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. 20, 1988
Filed:
Oct. 15, 1986
Paul A Nystuen, West Fargo, ND (US);
Barry D Batcheller, West Fargo, ND (US);
J. I. Case Company, Racine, WI (US);
Abstract
The present invention is a steering system for an articulated vehicle which has at least one axle mounted for wagon-wheel steering with respect to the vehicle, a hydraulic actuator for pivoting the axle with respect to the vehicle and a pair of hydraulic actuators for causing articulation of the vehicle. The improved steering system includes sensors for providing signals dependent on the degree of axle pivot relative to the vehicle, the degree of articulation of the vehicle and the desired direction of the vehicle travel. These signals are detected by a controller which in turn controls actuation of the axle and articulation hydraulic actuators. The actuators are operated in a sequential manner so that small directional changes of the vehicle are achieved solely through pivoting of the axle. Operation of the axle and articulation actuators are controlled through manipulation of a hydraulic fluid diverting valve, with the timing and duration of valve actuation being controlled by the controller as a function of various dynamic turning parameters of the vehicle and the response time of the valve.