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:
Jun. 07, 2005
Filed:
Jul. 31, 2002
Michael D. Anderson, East Peoria, IL (US);
Dennis H. Gibson, Chillicothe, IL (US);
Michael E. Pickell, Metamora, IL (US);
Jerry A. Wear, East Peoria, IL (US);
Matthew D. Friede, Fort Wayne, IN (US);
Michael D. Anderson, East Peoria, IL (US);
Dennis H. Gibson, Chillicothe, IL (US);
Michael E. Pickell, Metamora, IL (US);
Jerry A. Wear, East Peoria, IL (US);
Matthew D. Friede, Fort Wayne, IN (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A hydraulic system, such as a fuel injection system, includes a fixed displacement pump with at least one pump piston. A sleeve surrounds each pump piston and provides the method by which fluid displaced by the pumping stroke of the pump piston is directed either to a high pressure area in the pump or a low pressure area. The sleeves are a portion of an electro-hydraulic controller that includes a mechanical bias to bias the pump to a high output position when a pressure differential between the outlet area and the inlet area is relatively low, such as at cold start up. This aspect facilitates priming of the system. In addition, the controller includes a biasing hydraulic surface in opposition to the mechanical biaser that serves to bias the pump to its low output position when the pressure differential between the outlet area and the inlet area is relatively high. This aspect prevents over pressurization in the event that electric current to the controller is disrupted.