Mower Steering Control With Independent Wheel Speeds for Turf Turns
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Solution Overview
Problem
Conventional steering systems for commercial mowers cause wheels to skid during turns, leading to grass damage, especially in large grassy areas like golf courses and sod farms, due to mismatched rotational speeds and angles of wheels.
Innovation Solution
A steering system with wheel-specific driving units and a controller that calculates and applies different rotational speeds and orientations to each wheel based on the current ground speed and steering direction, ensuring each wheel travels the appropriate arc length and remains tangent to its path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional steering systems are used with matched wheel speeds, then the mower can turn, but the wheels skid during turns causing grass damage
Solution Approach 1:
The steering system is segmented by providing independent wheel-specific driving units for each wheel, allowing individual speed control. The controller calculates and applies different rotational speeds to each wheel based on its position and the turn geometry, preventing skidding while maintaining turning capability
Solution Approach 2:
The system dynamically adjusts wheel speeds during turns by continuously calculating the required speed for each wheel based on current ground speed, steering direction, and wheel position. This dynamic speed adjustment ensures each wheel rotates at the correct speed to follow its intended path without skidding
2Device complexity
If all wheels rotate at the same speed, then the steering system is simple, but the outer wheels must travel farther than inner wheels causing skidding
Solution Approach 1:
Each wheel is assigned a specific driving unit that provides locally optimized speed control. The controller calculates the appropriate speed for each wheel based on its local position in the turn (inner vs. outer wheel), ensuring each wheel has the quality of motion appropriate to its specific trajectory
Solution Approach 2:
The system changes the speed parameter for each wheel independently based on the turn geometry and wheel position. By adjusting the rotational speed parameter for each wheel-specific driving unit, the system achieves accurate wheel paths without requiring complex mechanical steering linkages
Data Source
AI summary
A steering system for a mower can include a wheel-specific driving unit for each wheel and a controller for providing control signals to each wheel-specific driving unit to thereby cause each wheel to be independently rotated at a different speed during a turn. By independently rotating each wheel, the mower can complete a turn without damaging the grass. The controller may also provide control signals to cause each steerable wheel to be positioned in a different wheel direction during the turn.