Dual response aircraft reference synchronization

US4477876A · kind A · utility

Assignee

• UNITED TECHNOLOGIES CORPORATION · US

Inventors

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

Key dates

• Filing date: Mar 30, 1981
• Grant date: Oct 16, 1984
• Expiry date: Mar 30, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D1/0061
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In an aircraft automatic flight control system having a reference parameter synchronizing system (70) operable in response to a trim release switch (44), an initial trim release period (139), on the order of a large fraction of a second (137) causes (217, 218) a relatively slow effect trim reference integrator (208, 211) time constant, for smooth transitions of any error signal, followed by a relatively fast (216) effective reference integrator time constant for close, rapid tracking of the reference signal with the actual aircraft parameter.