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:
Sep. 27, 1988
Filed:
Dec. 05, 1986
Yehia M El-Ibiary, Troy, MI (US);
Richard S Leemhuis, Troy, MI (US);
Vickers, Incorporated, Troy, MI (US);
Abstract
A power servo system which includes an actuator coupled to a load and receives an input command signal indicative of desired motion at the load. A sampled-data control system receives and samples input signals indicative of desired and actual motion at the hydraulic actuator and load, and provides control signals to the actuator necessary to obtain desired motion. The sampled-data control system includes digital processing circuitry with series and feedback compensation, coordinated with the hydraulic system transfer function, to form a complete closed-loop control system operating in the sampled-data or Z-transform domain. Different equation constants in the series and feedback compensation circuitry are recalculated periodically. Such constants are recalculated as a function of system behavior, so that system control automatically varies with operating conditions. Sampled data domain orders in the series and feedback compensation circuitry permit static gain and velocity constants to be selected independently of other system variables.