Motor Grader Blade Height Control Using Forward Topography Detection
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Solution Overview
Problem
Motor graders experience inaccuracies in land-grading due to the blade's position variation when traversing ground projections and recesses, leading to insufficient or excessive grading, which disrupts the intended topography.
Innovation Solution
A method for controlling a motor grader that includes a blade between the front and rear wheels, equipped with a height adjustment mechanism, which obtains current topography and adjusts the blade's height based on it to maintain accurate grading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade height is fixed relative to the vehicular body, then the structure is simple, but the grading accuracy deteriorates due to blade position variation when traversing ground projections and recesses
Solution Approach 1:
The system performs preliminary detection of ground topography using sensors before the blade reaches the area, allowing the control system to pre-adjust the blade height in anticipation of upcoming projections or recesses, thereby maintaining consistent grading accuracy
Solution Approach 2:
The system continuously monitors blade position and ground topography through sensors, feeds this information back to the control unit, and dynamically adjusts the blade height to compensate for ground variations, resolving the contradiction between fixed structure and grading accuracy
2Manufacturing precision
If the blade height is adjusted dynamically based on ground topography, then the grading accuracy is improved, but the response time may be insufficient to compensate for rapid terrain changes
Solution Approach 1:
The forward-looking sensors detect ground topography changes before the blade encounters them, allowing the control system to initiate height adjustments in advance, effectively increasing the response speed by acting before the need arises
Solution Approach 2:
The system replaces mechanical linkage-based height control with an electronic control system that processes sensor data and actuates the height adjustment mechanism electronically, significantly improving response speed compared to purely mechanical systems
3Manufacturing precision
If the blade height is adjusted to follow ground variations, then the grading precision is improved, but the blade may cut into the ground excessively when encountering recesses
Solution Approach 1:
The control system applies preliminary counter-action by detecting recesses in advance and adjusting the blade height upward before the blade reaches the recess, preventing excessive cutting into the ground while maintaining grading precision on surrounding areas
Data Source
AI summary
A method of controlling a motor grader including a blade provided between a front wheel and a rear wheel which are attached to a vehicular body and a height adjustment mechanism which adjusts a height of the blade includes obtaining current topography in front of the motor grader and adjusting a height of the blade with respect to the front wheel based on the current topography.