Work Vehicle Blade Cylinder Positioning for Grade Control
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Solution Overview
Problem
Existing work vehicles require multiple passes to correct grade errors due to interactions of pitch, tilt, and angle adjustments, leading to inefficiencies in surface control.
Innovation Solution
A work vehicle design featuring a boom assembly with tilt and angle cylinders, an attachment coupler, and an adjustable linkage that positions the blade's angle cylinder below the joint's upper surface, reducing cross-functional interactions and improving precision in grade control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple passes are used to correct grade errors, then grade control accuracy is improved, but productivity decreases
Solution Approach 1:
The blade control system is segmented into three independent cylindrical actuators: a tilt cylinder for pitch control, an angle cylinder for blade angle adjustment, and a lateral shift cylinder for horizontal positioning. This segmentation allows each actuator to control one degree of freedom independently, eliminating the interference that occurs in traditional systems where adjusting one parameter affects others. The independent control enables grade correction in a single pass, improving productivity while maintaining accuracy.
2Adaptability or versatility
If pitch, tilt, and angle adjustments are made simultaneously, then adaptability is improved, but control precision deteriorates due to interactions
Solution Approach 1:
The control system divides the blade adjustment functions into three separate cylindrical actuators, each responsible for a specific degree of freedom: tilt cylinder for pitch, angle cylinder for blade angle, and lateral shift cylinder for horizontal position. This segmentation eliminates the coupling effects present in traditional linkage systems, allowing each parameter to be adjusted independently without interfering with others, thus maintaining both adaptability and precision.
Solution Approach 2:
The system uses dynamic hydraulic actuators that can be controlled independently and simultaneously without mechanical interference. The cylindrical actuators provide dynamic control capability where each actuator can respond to control signals independently, enabling flexible multi-parameter adjustment while maintaining precise control through electronic control system coordination.
Data Source
AI summary
A work vehicle comprising a frame supported by a ground engaging device. A boom assembly is coupled to the frame. A boom cylinder is coupled to the frame and the boom assembly. An attachment coupler is coupled to a distal portion of the boom assembly. At least one tilt cylinder is coupled to the boom assembly and the attachment coupler. An attachment is coupled to the attachment coupler. The attachment comprises an attachment frame coupled to the attachment coupler. The attachment frame has a lower portion and an upper portion. A joint is coupled to the lower portion of the attachment frame and a blade. The joint has an upper surface and a lower surface positioned a distance from the surface. An angle cylinder is coupled to the lower portion of the attachment frame and a blade. A portion of the angle cylinder is positioned below the upper surface.