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:
Jan. 17, 1989
Filed:
Mar. 07, 1988
Rajamouli Gunda, Rochester Hills, MI (US);
Vickers, Incorporated, Troy, MI (US);
Abstract
An electrohydraulic servo system for controlling pressure of fluid in a cavity of undetermined volume includes a valve having a valve spool element and ports for supplying fluid as a function of position of the valve element within the surrounding valve body. A servo valve is responsive to electronic valve control signals for controlling pilot pressure within the main valve body and thereby controlling position of the valve element. An electronic valve controller receives a pressure command signal from remote master electronics as a function of desired fluid pressure within the cavity volume, and a pressure feedback signal indicative of fluid pressure within the cavity volume from a pressure sensor coupled to the valve output ports. The pressure command signal is compared to the pressure feedback signal in a pressure-control mode of operation, and a difference or error signal is employed for generating valve control signals to the servo valve. A second sensor is coupled to the valve element for supplying a position feedback signal as a function of position of the valve element within the surrounding valve body.