Pool-Cleaning Robot Steering Using Weight Difference and Fluid Forces

The patent extracts the steering function from the traditional multi-motor differential drive system and implements it through fluid dynamics forces. Instead of using multiple motors to independently control each side's movement, the invention uses a single pump to generate fluid forces that naturally steer the robot by creating asymmetric thrust on the cleaning rollers, thereby reducing device complexity while maintaining steering capability.

The patent applies hydraulic principles by using a fluid pump to generate controlled fluid flows that act on the cleaning rollers. The pump creates fluid pressure differences and flow patterns that produce steering forces, replacing the need for multiple motors with a single hydraulic actuation system that achieves the same steering effect with fewer components.

The patent merges the functions of multiple motors into a single pump system. Instead of having separate motors driving cleaning rollers on left and right sides independently, the invention combines all driving and steering functions into one pump that generates fluid forces to drive the rollers and simultaneously control steering, thereby reducing energy consumption by eliminating redundant motor systems.

The patent uses hydraulic energy conversion where a single pump converts electrical energy to fluid pressure and flow energy, which then drives the cleaning rollers through fluid-mechanical interaction. This approach is more energy-efficient than using multiple electric motors because it eliminates the inefficiencies of multiple independent drive systems and utilizes fluid dynamics to achieve both propulsion and steering with a single energy input.