Coordinated Steering of Grader Attachments for Stable Traction
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Solution Overview
Problem
Motor graders or grader attachments with caster wheels face challenges in maintaining consistent grading depth and smoothness due to lateral forces, leading to traction loss on uneven terrain, especially when the work machine's turn radius exceeds the steerable attachment's capability.
Innovation Solution
A steerable attachment system for work machines, comprising a fastening portion, a blade, ground-engaging members, and a steerable axle system, controlled by an electronic control module that coordinates with the machine's control module to match steering radii and ensure the attachment's capabilities are not exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If caster wheels are used on the attachment, then the attachment can move freely, but lateral resistance is insufficient causing traction loss
Solution Approach 1:
The patent transforms static caster wheels into dynamic steerable wheels with active control. The steerable attachment includes a steerable axle system with ground-engaging members that can be actively directed, allowing the attachment to dynamically adapt to lateral forces during grading operations, thereby maintaining both mobility and traction stability.
Solution Approach 2:
The patent implements a feedback control system where sensors detect the position and orientation of the steerable attachment, and this information is fed back to the control system. The controller adjusts the steerable axle system in real-time to maintain proper alignment and traction, resolving the contradiction between free movement and stable traction.
2Ease of operation
If the work machine attempts a tight turn, then the work machine can maneuver in tight spaces, but the steerable attachment may lose traction
Solution Approach 1:
The control system receives feedback from sensors monitoring the steerable attachment's position and orientation during turning operations. When a tight turn is detected, the controller actively adjusts the steerable axle system to maintain optimal ground contact and traction, allowing the work machine to maneuver in tight spaces without compromising attachment stability.
Solution Approach 2:
The steerable attachment system dynamically adjusts its configuration during turning operations. The ground-engaging members can be actively directed to maintain proper alignment with the ground surface during tight turns, enabling the work machine to achieve high maneuverability while the attachment maintains reliable traction throughout the maneuver.
3Manufacturing precision
If a large motor grader is used, then grading depth and smoothness can be maintained, but it is not suitable for tight spaces and rough terrain
Solution Approach 1:
The patent segments the grading function from the work machine by using a separate steerable attachment with its own independent steering and ground-engaging system. This allows the compact work machine to maintain maneuverability for tight spaces and rough terrain while the attached grading blade provides professional-grade grading precision, effectively combining the advantages of both large graders and compact machines.
Solution Approach 2:
The steerable attachment provides dynamic adaptability to various terrains while maintaining grading precision. The active steering control system allows the attachment to adapt to rough terrain and tight spaces, while the blade configuration maintains consistent grading depth and smoothness, enabling operation in environments where large motor graders cannot work.
Data Source
AI summary
Traditionally, for certain grading tasks in which a motor grader is not suitable or available, a grader attachment, with caster wheels and a blade, may be attached to a work machine, such as a skid steer. Such systems have difficulty operating due to lateral forces on the blade. Accordingly, a steerable attachment is disclosed with ground-engaging members (e.g., wheels) that can be steered and/or driven via an attachment electronic control module, which is in communication with a machine electronic control module of the work machine. In particular, attachment electronic control module and machine electronic control module may coordinate the steering of the work machine and steerable attachment, using a feedback loop, to ensure that the steering of the work machine does not exceed the capabilities of the steerable attachment.