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:
Apr. 22, 1997
Filed:
Nov. 30, 1995
Nathan T Schenkel, Coal City, IL (US);
Rick D Vance, Washington, IL (US);
Peter R Hildner, Apex, NC (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
In one aspect of the present invention, an apparatus and method for calibrating an electrohydraulic system is disclosed. In accordance with the present invention, a hydraulic valve that is responsive to an electrical valve signal controllably provides hydraulic fluid flow to a hydraulic actuator. A position sensor senses the position of the hydraulic actuator and responsively produces an actuator position signal. A microprocessor based controller receives the actuator position signal and determines when the hydraulic actuator begins movement, and associates the magnitude of the electrical valve signal to a first predetermined joystick position. Thereafter, the microprocessor based controller determines when the hydraulic actuator movement reaches terminal velocity and associates the magnitude of the electrical valve signal to a second predetermined joystick position.