Invention Grant
- Patent Title: System and method for avoiding inadvertant entry into an unsafe vertical descent speed region for rotorcraft
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Application No.: US14623382Application Date: 2015-02-16
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Publication No.: US09886039B2Publication Date: 2018-02-06
- Inventor: Luke D. Gillett , Joseph M. Schaeffer , Christopher M. Bothwell , Robert Worsham , Jillian Alfred , Sung Kim
- Applicant: Bell Helicopter Textron Inc.
- Applicant Address: US TX Fort Worth
- Assignee: Bell Helicopter Textron Inc.
- Current Assignee: Bell Helicopter Textron Inc.
- Current Assignee Address: US TX Fort Worth
- Agency: Lightfoot & Alford PLLC
- Main IPC: G05D1/08
- IPC: G05D1/08 ; G05D1/06 ; B64C27/10 ; B64C27/16 ; B64C27/605

Abstract:
A flight control system having a control law, the control law operable to generate a modified pitch command, the modified pitch command representing a greater amount of collective pitch compared to an amount of collective pitch generated by a first pitch command, the modified pitch command being generated because a vertical descent speed of the rotorcraft at a given forward airspeed is greater than a threshold. A method of avoiding entry into an undesired vertical descent speed region during operation of a rotorcraft, including measuring a forward airspeed; evaluating a vertical descent of the rotorcraft; and generating a modified collective pitch command in respond to a first collective pitch command having a collective pitch value that would cause the rotorcraft to experience a vertical descent rate greater than a threshold value at the forward airspeed of the rotorcraft.
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