Motion Control System Force Feedback Derivative
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Solution Overview
Problem
Current motion-control systems, such as steer-by-wire systems, provide limited feedback to operators due to reliance on basic factors like speed and error for controlling feedback force, resulting in an incomplete operating experience.
Innovation Solution
A motion-control system with an operator interface and a controllable force feedback device that adjusts feedback force based on a control error between target and actual values, varying the derivative of feedback force with respect to control error to enhance operator feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical signals are used to transmit operator inputs instead of mechanical connections, then transmission efficiency and control precision are improved, but feedback force transmission to the operator is lost
Solution Approach 1:
The patent implements a feedback device that generates feedback force on the operator-input member based on the control error. The controller receives operator input, determines control error, and commands the feedback device to apply proportional feedback force, creating a closed-loop feedback mechanism that restores tactile information loss in electrical transmission systems
Solution Approach 2:
The feedback device acts as an intermediary between the controller and the operator-input member. It converts electrical control error signals into mechanical feedback force, mediating the information transmission between the electrical control system and the operator's tactile sense
2Device complexity
If basic factors like speed and error are used to control feedback force magnitude, then system complexity is reduced, but the comprehensiveness of operator feedback is insufficient
Solution Approach 1:
The patent changes the parameter used for feedback force control from basic speed and error to the derivative of feedback force with respect to control error. This parameter transformation enables the system to provide more comprehensive feedback information about system state and dynamics while maintaining manageable complexity through a unified control approach
3Ease of operation
If the derivative of feedback force with respect to control error is kept constant, then control simplicity is maintained, but nuanced operator feedback is lost
Solution Approach 1:
The patent makes the derivative of feedback force with respect to control error variable rather than constant. The controller dynamically adjusts this derivative based on operating conditions, enabling the feedback force to adaptively provide nuanced information about system state while maintaining a relatively simple control architecture
Data Source
AI summary
A motion-control system includes an operator interface with an operator-input member and a controllable force feedback device drivingly connected to the operator-input member. The motion-control system may also include controls that regulate the motion of one or more moveable components, including adjusting a first operating parameter in a manner that depends at least in part on a control error between a target value of a second operating parameter and an actual value of the second operating parameter. The target value of the second operating parameter may be based at least in part on the motion of the operator-input member. The controls may also operate the controllable force feedback device to provide feedback force on the operator-input member in a manner that depends at least in part on the control error and such that the derivative of the feedback force with respect to the control error varies dependent at least in part on the control error.