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:
Nov. 06, 2007
Filed:
May. 19, 2005
Robert Eugene Kasten, Denver, CO (US);
Mervin Peter Kizlyk, Cedar Falls, IA (US);
Norman Frederick Lemmon, Cedar Falls, IA (US);
Bernard Brandt Poore, East Moline, IL (US);
Robert Eugene Kasten, Denver, CO (US);
Mervin Peter Kizlyk, Cedar Falls, IA (US);
Norman Frederick Lemmon, Cedar Falls, IA (US);
Bernard Brandt Poore, East Moline, IL (US);
Deere & Company, Moline, IL (US);
Abstract
A vehicle drive speed control system is provided for a vehicle having driven rear wheels, driven steerable front wheels, a powertrain for driving the front and rear wheels at controllable speeds. A control unit controls the powertain so that a front/rear wheel speed ratio is a non-linear trigonometric function of a sensed steering angle signal. The front/rear wheel speed ratio increases as the steering angle increases. The relationship of the front/rear wheel speed ratio to the steering angle is represented by a curve which is concave in a direction of an axis of increasing speed ratio. With a mode select switch, an operator can selectively cause the control unit to control the front/rear speed ratio according to a first normal or a second more aggressive predefined relationship.