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:
Aug. 07, 2007
Filed:
Aug. 31, 2005
Jiao Zhang, Naperville, IL (US);
Pengfei MA, Naperville, IL (US);
Aleksandar Egelja, Naperville, IL (US);
Michael T. Verkuilen, Metamora, IL (US);
Jiao Zhang, Naperville, IL (US);
Pengfei Ma, Naperville, IL (US);
Aleksandar Egelja, Naperville, IL (US);
Michael T. Verkuilen, Metamora, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A hydraulic control system has an actuator with first and second chambers, first and second valves having elements movable to fill and drain the first and second chambers, and at least one sensor configured to generate a load signal indicative of a load on the fluid actuator. The system has an interface device movable to generate a desired velocity signal of the actuator. The system has a controller in communication with the first and second valves, the at least one sensor, and the interface device. The controller is configured to move the element of the first valve to a position based on the desired velocity signal and to move the element of the second valve to a position based on the load signal and a desired pressure within the second chamber.