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:
Feb. 08, 2022
Filed:
Mar. 05, 2020
Honeywell International Inc., Morris Plains, NJ (US);
Paul W. Futa, North Liberty, IN (US);
Matthew Arend, South Bend, IN (US);
Charles Walejewski, South Bend, IN (US);
Calin Bondariu, Mishawaka, IN (US);
HONEYWELL INTERNATIONAL INC., Charlotte, NC (US);
Abstract
A system uses a two-stage electrohydraulic servo valve that includes an additional control port that commands a fail-fixed valve to lock the position of a device in the last commanded position. The additional port is modulated by an existing land on the EHSV valve element, adding little to no complexity. Major technical benefits of the disclosed system are that it adds little to no cost, complexity, size, or weight the device being controlled. The disclosed configuration allows for the use of a relatively small and simple fail-fixed valve, and the control ports on the controlled device keep 'drift' to a minimum, when transitioning between normal operating mode and fail-fixed operating mode.