1 Title of the Invention
Electrical Harmonization Circuit for Auto Flight System
2 Field of the Invention
This invention generally relates to electrical engineering field and
5 particularly narrates about the design of an electrical circuit to facilitate
proper interface of synthesized auto-trim commands to trim actuator in
specific sequence time sequence as per the auto flight system
requirement.
3 Background of the Invention
10 The challenge was to facilitate the interface of synthesized auto-trim
commands from the auto flight system to the trim actuator ensuring that
the commands are electrically compatible with the actuator and its relay
based circuit. The other challenge was to prevent the condition of trim
actuator running on uncommanded auto-trim signals leading to trim
15 runaway condition.
4 Brief Summary of the Invention
This invention provides solution of Electrical Harmonization between Auto
Flight System and the Trim Actuator of the aircraft.
The present invention entails specially designed electrical circuit for auto
20 flight system so that pitch trim commands are harmonized with the trim
actuator and actuator runs smoothly but only for the duration that is
intended to achieve desired flying performance of the aircraft.
Circuit entails specially designed safety features that prevent
uncommanded pitch trim output due to single point of failure in one of the
25 circuit components.
Page 2 of 5
Applicant: Hindustan Aeronautics Limited
5 Detail Description of the Drawings
Figure 1: Circuit Diagram for Electrical Harmonization Circuit with Timing
controlled relays, Normal relays, Diodes, Shorting Splices, Connector and
Electrical Wires.
5 6 Detail Description of the Invention
The invention disclosed hereunder is about an Electrical Harmonization
Circuit for Auto Flight System of an aircraft.
Harmonization of auto trim command signal from auto flight system both in
terms of its compatibility with the trim actuator as well a