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:
Nov. 22, 2011
Filed:
Mar. 06, 2008
Francisco Roberto Green, Dayton, OH (US);
Francisco Roberto Green, Dayton, OH (US);
Caterpillar Trimble Control Technologies LLC, Dayton, OH (US);
Abstract
A method of calibrating an electrically actuated hydraulic valve in a system that controls the flow of hydraulic fluid to a hydraulic cylinder connected to a machine element operates automatically. The system includes an ultrasonic sensor providing an indication of the position of the machine element. The calibration method includes the step of automatically applying a command signal to the hydraulic valve while monitoring the ultrasonic sensor to determine the level of the command signal required to cause the hydraulic cylinder to begin to move. The calibration method includes the additional step of automatically applying in succession a plurality of command signals of increasing level to the hydraulic valve while monitoring the ultrasonic sensor to determine the speed of movement of the hydraulic cylinder resulting from each of the command signals. Finally, the calibration method includes the steps of storing the level of the command signal required to cause the hydraulic cylinder to begin to move, and storing the speed of movement of the hydraulic cylinder resulting from each of said plurality of command signals of increasing level.