Work Machine Control Mode Transition Dynamics
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Solution Overview
Problem
Transitioning between different control systems in work machines, such as excavators, can result in undesirable behavior due to abrupt or slow changes in control signals, causing operator discomfort and mechanical strain.
Innovation Solution
Implementing a time-based transition constraint processing system that adjusts the transition period based on the difference in control signals and the specific control systems involved, ensuring a smooth and controlled shift between control modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control signal transitions between different control systems are implemented, then control mode switching capability is improved, but abrupt or slow changes cause operator discomfort and mechanical strain
Solution Approach 1:
The patent implements dynamic transition constraint processing that adjusts the transition time based on real-time conditions. The system dynamically determines appropriate transition durations by considering the difference between control signals and the types of control systems involved, allowing the transition behavior to adapt rather than remaining fixed. This resolves the contradiction by making the control mode switching capability flexible while preventing abrupt or slow changes that cause discomfort and strain.
Solution Approach 2:
The patent changes the parameter of transition time based on control signal differences and control system types. By modifying the transition time parameter dynamically, the system achieves smooth transitions that prevent both abrupt changes (causing mechanical strain) and overly slow transitions (causing operator discomfort). This parameter adjustment resolves the technical contradiction between enabling control mode switching and preventing harmful effects.
2Speed
If transition time between control systems is reduced, then responsiveness is improved, but abrupt transitions cause mechanical strain
Solution Approach 1:
The system dynamically adjusts transition time based on real-time control signal differences and control system types. Rather than using a fixed short transition time that causes mechanical strain, the system adapts the transition duration to match the operational context, achieving responsiveness while preventing excessive mechanical stress.
Solution Approach 2:
The patent modifies the transition time parameter based on the magnitude of control signal differences and the specific control systems involved. This dynamic parameter change allows the system to achieve fast responsiveness when safe, while extending transition time when large signal changes would cause mechanical strain, thus resolving the contradiction between speed and stress.
3Stress or pressure
If transition time between control systems is increased, then mechanical strain is reduced, but transition speed decreases
Solution Approach 1:
The system implements dynamic transition constraint processing that adapts transition time to operational conditions. The transition speed is not fixed but adjusts based on control signal differences and control system types, allowing the system to achieve smooth transitions with minimal mechanical strain while maintaining acceptable transition speed through intelligent adaptation.
Solution Approach 2:
The patent dynamically changes the transition time parameter based on real-time analysis of control signals and control system characteristics. This allows the system to extend transition time when mechanical strain prevention is critical, while reducing transition time when speed is prioritized, thus resolving the contradiction between mechanical strain reduction and transition speed.
4Power
If control signal values change rapidly, then system responsiveness is improved, but operator comfort deteriorates
Solution Approach 1:
The system dynamically regulates the rate of control signal changes during mode transitions. By adapting transition time to the specific control systems and signal differences involved, the system maintains high responsiveness when appropriate while preventing rapid changes that would discomfort the operator, thus resolving the contradiction between power and ease of operation.
Solution Approach 2:
The patent adjusts the transition time parameter based on control signal differences and control system types to optimize the balance between responsiveness and operator comfort. This dynamic parameter modification ensures that control signal changes are neither too rapid (causing discomfort) nor too slow (reducing responsiveness), resolving the technical contradiction between power and ease of operation.
Data Source
AI summary
A work machine has a plurality of different control systems. Each control system generates a request or control signal to control a controllable subsystem. A control supervisor selects which of the plurality of control systems is to control the controllable subsystem and provides feedback to the plurality of control systems indicating which of the plurality of control systems has been selected and a current control signal value. A time-based transition constraint processing system generates a time-based transition constraint that is used to control the transition from the current control signal value generated by the first control system, of the plurality of control systems, and to the selected control signal value generated by the selected control system. The selected control system controls the controllable subsystem based upon the time-based transition constraint.