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:
Dec. 22, 2015
Filed:
Jan. 02, 2014
Caterpillar Paving Products, Inc., Minneapolis, MN (US);
Brian D. Kuras, East Peoria, IL (US);
Michael J. Barngrover, Brimfield, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A system and method are provided for maintaining hydraulic steering for a machine during engine out or engine lugging conditions. The machine includes a torque-controlled transmission driven by an engine, the engine further being linked to a hydraulic steering pump that provides hydraulic power to a steering actuator. The machine may be, for example, a wheel loader or an off highway truck. The system and method include detecting an undesirable reduction of engine speed while the machine is travelling, and responsively reducing the transmission power to maintain the engine speed at a desired level to power the hydraulic steering pump. When the reduced requested transmission power reaches zero, a power reversal through the transmission is commanded to maintain the engine speed at the desired level to power the hydraulic steering pump.