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. 13, 2001
Filed:
Jun. 30, 1998
Arvinder S. Virdee, Mill Creek, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
In an autothrottle system having the capability to reduce engine throttle setting from a first position to an idle position, an improvement including calculating a rate of throttle reduction as a function of the combination of a nominal retard rate value (,) and a retard rate adjustment value (,). In one embodiment, the nominal retard rate value (,) is equal to the angular difference between a current engine throttle control lever position (TRA) and an idle engine throttle control lever position (TRAIDLE), the difference being divided by an amount in the range of about 3 seconds to about 10 seconds. The retard rate adjustment value (,) is calculated as a function of the difference between current airspeed (V,) and a commanded airspeed (V,). During an underspeed condition, the retard rate adjustment signal decreases the rate of throttle reduction from the nominal retard rate value (,). During an overspeed condition, the retard rate adjustment signal increases the rate of throttle reduction from the nominal retard rate value (,).