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:
Jan. 25, 2011
Filed:
Mar. 17, 2008
Hong-chin Lin, Glenview, IL (US);
Salem Haggag, Cairo, EG;
Hong-Chin Lin, Glenview, IL (US);
Salem Haggag, Cairo, EG;
Caterpillar Inc, Peoria, IL (US);
Abstract
A dual mode control system for a hydraulic circuit () having a variable displacement pump () includes at least two actuators, each controlled by a respective valve. The valves are connected in series with a pressure sensor () measuring a pressure of fluid between the first valve () and the second valve () and relaying a signal to the electronic controller (). The electronic controller () operates in a first mode, varying the displacement of the pump () based on a command signal operating at least one of the valves, and operates in a standby mode, varying the displacement of the pump () based on the signal from the sensor, when both valves are in their respective neutral positions.