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:
May. 29, 2012
Filed:
May. 20, 2009
John G. Brome, Janesville, WI (US);
Douglas Wolken, Paxton, IL (US);
John G. Brome, Janesville, WI (US);
Douglas Wolken, Paxton, IL (US);
CNH America LLC, New Holland, PA (US);
Abstract
The control system allows selecting from multiple speed ranges for the ground drive of a work machine without a mechanical transmission. The system does this by controlling a variable displacement fluid pump supplying fluid to variable displacement fluid motors driving ground wheels of the machine. When a speed range is selected, the system automatically controls displacement of the pump and motors to provide operability within the range by movement of a speed input device. When another range is selected, the system provides a seamless transition, including to and from reverse, as no disengaging and engaging of mechanical gears, or change in the speed input position, is required. The system can also automatically adjust ground speed for the new speed range for the current speed input position.