Asymmetric Drive Control for Pool Cleaner Drift
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Solution Overview
Problem
Automatic swimming pool cleaners face difficulties in maintaining contact with vertical walls and overcoming lateral drift due to insufficient power and traction while climbing, leading to deviations from the intended course.
Innovation Solution
Implementing an orientation sensor and controller system that adjusts the traction speed of motive elements on one side of the cleaner's body relative to the other to counteract drift by unbalancing the speeds of left and right motive elements when a deviation is detected, allowing the cleaner to return to a vertical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cleaner uses balanced traction speeds on both sides to maintain stable forward movement, then the device complexity is reduced, but lateral drift occurs due to insufficient traction control
Solution Approach 1:
The drive control system transitions from a static balanced configuration to a dynamic asymmetric configuration. The controller automatically adjusts the traction speeds of left and right motive elements based on real-time drift detection, enabling the system to adapt its symmetry level to operational needs while maintaining overall control stability.
Solution Approach 2:
The system incorporates a feedback loop where the controller monitors cleaner position and orientation, compares actual performance against desired trajectory, and automatically adjusts the drive mechanism accordingly. This closed-loop control corrects lateral drift by modulating the traction speeds of individual side motive elements based on detected positional deviations.
2Power
If the cleaner increases power output to overcome gravity and maintain contact with vertical walls, then the climbing capability is improved, but energy consumption increases
Solution Approach 1:
Instead of continuously applying maximum power to all motive elements, the system applies power selectively and asymmetrically. The controller modulates the traction speeds of individual side motive elements, providing just enough power to overcome gravity and maintain wall contact while correcting drift, thereby reducing unnecessary energy consumption.
3Device complexity
If the cleaner uses a single drive motor for both left and right tracks to simplify the system, then the device complexity is reduced, but the ability to counteract lateral drift is compromised
Solution Approach 1:
The drive system is segmented into independent left and right drive mechanisms, each capable of independent speed control. This segmentation enables asymmetric operation where each side can be controlled separately to counteract lateral drift, while the overall system architecture remains relatively simple through modular design.
Data Source
AI summary
Apparatus and methods for counteracting, e.g., drift of automatic swimming pool cleaners are detailed. In particular, a drifting cleaner may recover its movement by altering traction speed of the motive element(s) on one side of its body. Such alteration may occur when the cleaner is travelling along a generally horizontally-oriented pool bottom, climbing up or down a wall, or otherwise moving within a pool.