Precision operator for an aircraft autothrottle or autopilot system with engine performance adjust
View Patent ↗An autothrottle system for an aircraft includes a motor, an actuator assembly, and a position sensor connected to a moving portion of the actuator assembly. An electronic controller is provided for receiving an aircraft engine operating parameter and to control the motor to rotate the shaft to adjust the engine operating parameter based on the engine operating parameter and a position signal received from the position sensor. The actuator assembly has a bearing assembly having a plurality of bearings configured to contact a surface of the shaft to effect movement of the throttle lever attachment end.
1. An autothrottle system for an aircraft, comprising:
a motor configured to impart rotational movement to a shaft extending from the motor, the motor being mounted on a support;
an actuator assembly operatively connected to the shaft and to an attachment end of a throttle lever, the throttle lever having a control end, opposite to the attachment end, for pilot application of manual force to the throttle lever;
a position sensor connected to a moving portion of the actuator assembly; and
an electronic controller for receiving an aircraft engine operating parameter and configured to control the motor to rotate the shaft to adjust the engine operating parameter based at least in part on the engine operating parameter and a position signal received from the position sensor;
wherein the actuator assembly comprises:
a bearing assembly having a plurality of bearings configured to contact a surface of the shaft for converting rotational movement of the shaft into linear motion of the bearing assembly along the shaft and operatively configured so that motor-driven rotation of the shaft by the controller causes the bearing assembly to linearly translate along the shaft to effect movement of the throttle lever attachment end and corresponding changes in engine operation in response to controller-sensing of at least the engine operating parameter.
2. The autothrottle system of claim 1 , wherein:
the position sensor is configured to sense changes in linear position of the actuator assembly along the shaft; and
the electronic controller receives the sensed changes in actuator position from the position sensor for use in causing the bearing assembly to linearly translate along the shaft.
3. The autothrottle system of claim 2 , wherein the position sensor comprises a potentiometer.
4. The autothrottle system of claim 1 , wherein the actuator assembly is configured so that manual movement of the control end of the throttle lever applies a thrust force to the shaft through the bearing assembly, and when the thrust force exceeds a threshold, the bearing assembly is configured to slip along the shaft irrespective of any rotation that may be concurrently imparted to the shaft by the motor.
5. The autothrottle system of claim 1 , wherein the bearing assembly is configured to accept the shaft in a throughbore of the assembly and comprises at least one set of bearings, each of the bearings being supported in the bearing assembly to contact the surface of the shaft at a predetermined angle relative to a longitudinal axis of the shaft.
6. The autothrottle system of claim 1 , wherein the motor is a bidirectional stepper motor.
7. The autothrottle system of claim 1 , wherein the position sensor comprises a sensor connected between the support and the moving portion of the actuator assembly.
8. The autothrottle system of claim 1 , wherein the position sensor comprises a potentiometer.