Aerator Hole Spacing Control via Electronic Speed Adjustment
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Solution Overview
Problem
Walk-behind aerators face challenges in maintaining consistent hole spacing due to fluctuations in engine speed and mechanical component wear, leading to inconsistent hole patterns.
Innovation Solution
A hole spacing control system with an operator-adjustable actuator and sensors for engine and coring head speed, coupled with an electronic vehicle control unit that adjusts traction drive wheel speed to maintain precise hole spacing, independent of engine speed variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical drive system with fixed hole spacing control positions is used, then device complexity is reduced, but manufacturing precision deteriorates due to hole spacing variations from engine speed fluctuations and component wear
Solution Approach 1:
The patent replaces the traditional mechanical hole spacing control system with an electronic control system. The electronic vehicle control unit receives inputs from a hole spacing actuator and engine speed sensor, processes signals electronically, and adjusts the traction drive system accordingly. This substitution of mechanical control with electronic control enables precise hole spacing maintenance despite variations in engine speed and mechanical component wear, while keeping the overall device complexity manageable through integrated electronic control.
2Productivity
If engine speed is increased to maintain productivity, then productivity is improved, but manufacturing precision deteriorates due to hole spacing inconsistencies from engine speed variations
Solution Approach 1:
The patent implements a feedback control mechanism where the electronic vehicle control unit continuously monitors engine speed via the engine speed sensor and adjusts the traction drive system accordingly. The control unit processes signals from the hole spacing actuator and engine speed sensor to maintain consistent hole spacing. This feedback loop allows the system to maintain both high productivity through adequate engine speed and high precision through real-time adjustments compensating for speed variations.
3Ease of manufacture
If mechanical tolerance issues are present in the drive system, then ease of manufacture is improved, but manufacturing precision deteriorates due to accumulated mechanical tolerances affecting hole spacing
Solution Approach 1:
The patent replaces the mechanical hole spacing control mechanism with an electronic control system that uses sensors and an electronic vehicle control unit. This substitution eliminates the accumulation of mechanical tolerances in the control path, as electronic signals can be precisely controlled and adjusted without the tolerance buildup inherent in mechanical linkages. The system maintains manufacturing ease through standardized electronic components while achieving superior hole spacing accuracy.
Data Source
AI summary
An aerator with a hole spacing control system is disclosed. The aerator has a traction drive with at least a pair of driven wheels and a single steered wheel. A vehicle control unit provides commands to the traction drive to move the aerator at a specified ground speed. An operator-adjustable hole spacing actuator may be moved to a plurality of hole spacing settings. The hole spacing actuator is electrically connected to the vehicle control unit. The vehicle control unit includes logic to vary the commands to the traction drive based on the hole spacing settings from the actuator. An engine speed sensor and/or coring head speed sensor also may be electrically connected to the vehicle control unit, and the vehicle control unit commands being also based on inputs from those speed sensors.