Implement Position Control for Work Vehicles
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Solution Overview
Problem
Conventional work vehicles fail to maintain the position of an implement relative to the ground surface accurately in uneven terrain, leading to suboptimal ground work performance due to lack of information from the implement side being used for actuator control.
Innovation Solution
Incorporating an implement side control device that provides information to the machine body side control device to adjust the actuator's position based on the implement's position relative to the ground surface, using sensors to detect height and posture changes, ensuring the implement maintains its target position and height regardless of terrain unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only machine body side information is used for actuator control, then the control system is simple, but the implement position accuracy deteriorates in uneven terrain
Solution Approach 1:
The patent introduces implement side sensors that detect the actual position and posture of the implement relative to the ground surface. This detection information is fed back to the control system, which then adjusts the actuator commands to compensate for terrain differences. The feedback loop enables the system to maintain accurate implement positioning even when the machine body encounters uneven ground, directly resolving the contradiction between system simplicity and positioning accuracy.
2Manufacturing precision
If implement side sensors are added to detect position relative to ground surface, then implement position accuracy improves, but device complexity increases
Solution Approach 1:
The implement side control device serves multiple functions: it detects implement position and posture, calculates terrain differences, generates correction commands, and communicates with the machine body side control device. By consolidating these functions into a single multi-functional control unit rather than separate dedicated components for each function, the patent reduces the overall device complexity while maintaining high implement position accuracy.
3Productivity
If terrain difference compensation is implemented, then ground work quality improves, but control algorithm complexity increases
Solution Approach 1:
The patent divides the control system into two independent but coordinated segments: the machine body side control device that handles overall actuator control, and the implement side control device that handles terrain difference compensation. Each segment performs a specific function with relatively simple algorithms, rather than requiring one complex centralized control algorithm. This segmentation reduces the computational complexity of individual control algorithms while maintaining overall ground work quality.
Data Source
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AI summary
A machine body side control device MC is configured to control an actuator A based on information on a posture change of a machine body obtained from a machine body side sensor MS and information on a position of an implement W relative to the ground surface obtained from an implement side sensor WS via an implement side control device WC.