Towable Implement Steering System with Multi-Mode Control
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Solution Overview
Problem
Conventional agricultural implements lack self-steering capabilities, making them costly and impractical for various applications, especially during transport and when navigating obstacles or slopes, and they are limited in movement types.
Innovation Solution
A steering system for towable implements that includes a steering sensor, controller, valve, and mechanism, allowing for automatic steering with GPS integration and multiple operational modes, enabling manual, transportation, cornering, swath tracking, and crab steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If GPS-based aftermarket steering systems are added to non-steerable implements, then self-steering capability is achieved, but system cost increases significantly
Solution Approach 1:
The steering system is designed to perform multiple functions including field operation steering, transport steering, cornering, and swath tracking using a single integrated system. The controller can operate in different modes (field operation mode and transport mode) without requiring separate systems, reducing overall complexity and cost while maintaining versatility
Solution Approach 2:
The system utilizes the tractor's existing GPS receiver and auto-guidance controller to provide steering control for the implement. By leveraging the tractor's own navigation capabilities, the implement can achieve self-steering without requiring a separate expensive GPS system, thereby reducing system cost while maintaining self-steering capability
2Adaptability or versatility
If aftermarket steering systems are installed on implements, then steering during field operation is provided, but steering during transport is not available
Solution Approach 1:
The steering system dynamically adapts its behavior based on the operating mode. In field operation mode, the system maintains implement alignment with the tractor. In transport mode, the system enables independent implement steering for cornering and maneuvering. This dynamic mode switching allows the single system to provide both field operation steering and transport steering without requiring separate systems
3Adaptability or versatility
If mechanical modifications are made to implements for steering, then steering capability is achieved, but warranty is voided
Solution Approach 1:
The steering system is designed as a modular add-on package that can be installed without modifying the implement's core structural components. The system segments the steering functionality into separate controllable elements (steering cylinders, control valves, sensors) that interface with the implement's existing hitch mechanism, avoiding warranty-voiding modifications while achieving steering capability
4Ease of operation
If conventional passive steering is used, then implement follows tractor motion, but implement cannot maintain alignment on sloped areas or avoid obstructions
Solution Approach 1:
The system continuously monitors the relative position and orientation between the tractor and implement using sensors, and the controller adjusts the steering command based on this feedback. This closed-loop control enables the implement to actively maintain alignment with the tractor on sloped terrain and navigate around obstructions while still following the tractor's overall motion path
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective, practical, and versatile self-steering of agricultural implements during field operations and transport, improving alignment and movement flexibility while maintaining alignment with the tractor.
Implementation Method 1
The steering sensor, which may be a rotary position sensor or linear position sensor, measures, directly or indirectly, the angular position of the steerable wheels of the implement
Implementation Method 2
The steering control valve controls the flow of hydraulic fluid to the steering cylinder, which, in turn, 'powers' the implement steering mechanism to turn the wheels of the implement
Data Source
AI summary
A steering system for a towable implement includes a steering sensor, an implement steering controller, a steering control valve, a steering cylinder, and an implement steering mechanism that steers the implement. The steering sensor measures, directly or indirectly, the angular position of the steerable wheels of the implement. The implement steering controller processes feedback from the steering sensor and with a desired steering angle, outputs a steering control signal that is input to the steering control valve. The steering control valve controls the flow of hydraulic fluid to the steering cylinder, which, in turn, powers the implement steering mechanism to turn the wheels of the implement. The steering system may be operated in various control modes, such as, a transportation steering mode, a corner and 180 turn steering mode, a swath tracking steering mode, crab steering mode, and a manual steering mode, which allows manual control of the steering system.