Speed-variable limits in fail-safe actuators

Details Speed-variable limits in fail-safe actuators Speed-variable limits in fail-safe actuators

G - Physics

05

D

341/78

G05D 3/00 (2006.01) G05D 1/00 (2006.01)

Patent

CA 1094667

ABSTRACT OF THE DISCLOSURE A positioning means for a critical aircraft surface, such as a stabilizing elevator in a helicopter, includes a pair of reversible electric jack-screw type actuators acting in series, each being controlled in a closed-loop fashion by separate electronic hardware, the position of each as well as the rate of change thereof being compared with the other, against limits which, according to the invention, are relatively broader at low speeds and are tightened at higher speeds. If either the positions of the rate of change of positions of the two actuators fail to track within the variable threshold disparity, an alarm condition is mani- fested and the actuators are disconnected from automatic control and rendered operable by manual control. The invention disclosed herein was made under or in the course of a contract with the Department of the Army.

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