Automatic flight control means for rotary wing aircraft having attitude-air speed control
US4005835A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Nov 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D1/0858
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An automatic flight control apparatus for a rotary wing aircraft for controlling the flight condition by utilizing a signal representing the air speed of the aircraft which is added to a bias signal corresponding to the attitude of the aircraft in hovering condition, which added signal is used as a "trim value" signal representing the attitude of the aircraft in a balanced relation to air speed at every instance. A signal representing the difference between said trim value signal and the attitude signal is used as an attitude/speed error signal and is added with the signal representing the difference between the ground speed and the set speed for performing control of the aircraft condition. Also, in order to provide true air speed utilizing a detecting means of the Pitot tube type, when the flight speed is below a predetermined value, a ground speed signal is added with a stored signal representing the difference between the air and ground speeds and the added signal is used instead of the air speed signal to overcome the inaccuracy of the Pitot tube at low speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.