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:
Oct. 04, 2016
Filed:
Dec. 09, 2011
Torsten Berg, Steina, DE;
Torsten Berg, Steina, DE;
Caterpillar Inc., Peoria, IL (US);
Abstract
A hydrostatic drive system for a vehicle () comprises an open circuit (), a closed travel circuit (), an electronic controller (), and a main variable displacement hydraulic pump () driven by an internal combustion engine () equipped with a speed sensor (). The main variable displacement hydraulic pump may be configured to supply hydraulic fluid to a hydraulic consumer () via a hydraulic supply line (). A pressure relief valve () may be connected to a reservoir () and may be permanently connected to the hydraulic supply line of the open circuit. The electronic controller may be configured to run a strong braking mode in which the electronic controller at least partially increases the displacement of the main variable displacement hydraulic pump such that hydraulic fluid is discharged via the permanently connected pressure relief valve into the reservoir if the sensed engine speed is higher than a predetermined maximum engine speed.