Abstract: An anti-skid brake control system (9) for a wheeled vehicle has a conventional continuous source of pressurized hydraulic fluid, a hydraulically actuated wheel rotation braking device which responds via a wheel brake valve (11) to applied hydraulic pressure to apply a braking force to a wheel of the vehicle, and an operator actuatable control (10, 12, 39) for varying the supply of hydraulic pressure to the wheel rotation braking device. The system is responsive directly to the operator actuatable control (10, 12, 39) for determining the deceleration (14) currently commanded by the operator and further dynamically determines a maximum permissible wheel deceleration (47) at a given time. The operator controlled supply of hydraulic pressure to the braking device is overridden in the event that the deceleration (14) currently commanded by the operator exceeds the maximum permissible wheel deceleration.

Abstract: There is disclosed an apparatus for and method of controlling a plant such as a turbojet engine wherein a model of the plant is created and plant performance request signals are applied to both the plant and the model of the plant. The performance of the model of the plant is used to modify the performance request signals supplied to the plant. Plant and plant model responses may also be compared to monitor degradation in performance of the plant. To adapt the scheme to nonlinear plants, the creation of a plurality of linear plant models each mimicking plant operation over a different limited portion of the total range of plant performance is employed and there is a plant model for each of several different plant operation pints about each of which, the actual plant operation is approximately linear.

Abstract: There is disclosed an apparatus for and method of controlling a plant such as a turbojet engine wherein a model of the plant is created and plant performance request signals are applied to both the plant and the model of the plant. The performance of the model of the plant is used to modify the performance request signals supplied to the plant. Plant and plant model responses may also be compared to monitor degradation in performance of the plant. To adapt the scheme to nonlinear plants, the creation of a plurality of linear plant models each mimicking plant operation over a different limited portion of the toal range of plant performance is employed and there is a plant model for each of several different plant operation points about each of which, the actual plant operation is approximately linear.

Abstract: A lever mechanism having an output end and an input end wherein the input end is pivotally mounted to a fixed support and provided with a track portion. The track portion has a spaced apart relationship to the pivot axis of the lever and is provided with a generally V-shaped portion and lateral side portions oppositely extending therefrom. A reference force is applied through a roller member which is positioned along the track by a variable input position signal applied thereto. The apex of the V-shaped portion is on a line through the pivot axis such that with the roller member held in a bottomed position and engaging both sides of the V-shaped portion there is no input moment applied to the lever mechanism and movement of the roller member in either direction from a null position produces a clockwise or counterclockwise motion of the output end of the lever mechanism, depending upon the direction of movement of the output end in response to the roller movement.