Work Machine Boom Speed Control for Land Grading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing work machine control methods, such as intervention control, face challenges in achieving accurate land grading due to response delays during high-speed movements of the dipper stick, particularly during land grading operations.
Innovation Solution
A work machine equipped with a dipper stick, boom, and a controller that adjusts the speed of the cylinder based on operation commands, utilizing conversion tables to calculate shift amounts and pilot oil pressures for the direction control valve, allowing for precise control of the boom speed to prevent target shape invasion during land grading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intervention control is applied to achieve land grading, then land grading capability is improved, but response delay occurs during high-speed movement
Solution Approach 1:
The control system dynamically adjusts the boom's response characteristics based on the dipper stick's movement state. When high-speed movement is detected, the system switches to a different control mode that prioritizes response speed over strict intervention control, thereby resolving the contradiction between grading accuracy and response delay
Solution Approach 2:
The system changes control parameters (such as gain values, response thresholds, or control algorithm coefficients) based on the operational state. By detecting high-speed dipper stick movement, the controller modifies parameters to reduce response delay while maintaining acceptable land grading precision
2Productivity
If high-speed movement of dipper stick is used to improve productivity, then land grading efficiency is improved, but response delay of boom occurs
Solution Approach 1:
The control system adapts its behavior based on the dipper stick's speed. During high-speed operations, the system dynamically adjusts the boom's control characteristics to maintain responsiveness, enabling high productivity without excessive response delay
Solution Approach 2:
The system continuously monitors the dipper stick's movement speed and uses this feedback to adjust the boom's control parameters in real-time, ensuring that productivity gains from high-speed operation do not result in unacceptable response delays
3Manufacturing precision
If intervention control is applied to achieve accurate land grading, then grading precision is improved, but target shape invasion occurs during high-speed movement
Solution Approach 1:
The control system dynamically switches between intervention control and a different control mode based on the dipper stick's speed. During high-speed movement, it transitions to a mode that prevents target shape invasion, while maintaining grading precision during slower operations
Solution Approach 2:
The system changes control parameters based on operational state. When high-speed dipper stick movement is detected, parameters are adjusted to prevent target shape invasion while maintaining acceptable grading precision
Data Source
AI summary
A work machine according to an aspect includes: a dipper stick; a boom; a cylinder for driving the boom; an operation apparatus for operating the dipper stick; and a controller for performing intervention control by using the boom in accordance with an operation command issued from the operation apparatus to achieve land grading. The controller determines whether or not the operation command from the operation apparatus indicates an amount greater than or equal to a predetermined amount, and corrects a speed of the cylinder when the operation command from the operation apparatus indicates an amount greater than or equal to the predetermined amount.