Command-inhibited aircraft attitude reference adjustment

US4383299A · kind A · utility

Assignee

• UNITED TECHNOLOGIES CORPORATION · US

Inventors

• William C. Fischer · Monroe, US
• Don L. Adams · Bartlesville, US
• David J. Verzella · Guilford, US
• Stuart C. Wright · Woodbridge, US

Key dates

• Filing date: Mar 30, 1981
• Grant date: May 10, 1983
• Expiry date: Mar 30, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D1/0816
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In an aircraft automatic flight control system (FIG. 1) beeping of the reference voltage in attitude synchronizing and beeping circuits (70, FIG. 4; 70R, FIG. 6) is inhibited (196, 201; 278, 282) in response to proportional commands (54, 55; 54R, 55R) in excess of a predetermined magnitude (183-186, 283-286). Beeping is inhibited only in the direction of the high proportional command, but not in the other direction. In a dual system (FIG. 1) pitch attitude beeping is inhibited only if both channels of the system have excessive proportional commands (195, 200, FIG. 3) whereas roll attitude beeping is inhibited if either channel has excessive proportional command (294, 295).