Blade Control Device for Excavation Slope Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The blade control system in work vehicles fails to accurately follow design surfaces with varying slopes due to control delays, leading to excavation beyond the desired shape.
Innovation Solution
A blade control device that includes a design surface acquisition unit, a vehicle body angle acquisition unit, a planned pitching angle calculation unit, and a target cylinder speed calculation unit, which corrects the observed pitch angle and calculates a target cylinder speed to adjust the blade's height, ensuring the blade follows the design surface by accounting for delays and slope changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade control system uses a standard hydraulic control mechanism, then the system structure remains simple, but control delays occur when the blade passes boundaries between surfaces with different slopes, causing the blade to fail to follow the design surface accurately
Solution Approach 1:
The system performs preliminary detection of the boundary between surfaces with different slopes before the blade reaches it. By calculating the anticipated blade position based on vehicle speed and blade length, the system prepares correction values in advance, allowing the blade to be adjusted smoothly across the boundary without control delays or overshooting.
Solution Approach 2:
The control system dynamically adjusts the blade position based on real-time detection of the vehicle's position relative to the design surface boundary. The correction amount varies continuously according to the detected position, enabling adaptive control that responds to changing conditions as the vehicle moves across different slope surfaces.
2Manufacturing precision
If the control system increases responsiveness to prevent delay, then the blade can follow the design surface more accurately, but the system complexity increases due to additional correction calculations
Solution Approach 1:
The system continuously detects the actual position of the blade relative to the design surface and compares it with the target position. Based on this feedback, the control unit calculates correction values and adjusts the hydraulic cylinder to move the blade toward the target position, creating a closed-loop control system that maintains precision without requiring overly complex hardware.
Solution Approach 2:
The control unit acts as an intermediary that processes the detected position information and translates it into appropriate hydraulic control commands. By introducing this intermediate processing layer, the system can implement sophisticated correction algorithms while keeping the physical hardware relatively simple.
Data Source
AI summary
A blade control method includes: acquiring a design surface indicating a target shape of an excavation object to be excavated by a blade supported by a vehicle body of a work vehicle, the design surface including a first surface present in front of the work vehicle and a second surface having a slope different from a slope of the first surface; acquiring an observed pitch angle indicating an inclination angle of the vehicle body in a longitudinal direction; and calculating a planned pitching angle indicating a deviation between the observed pitch angle and a design surface pitch angle indicating an inclination angle of the second surface in a state in which the vehicle body is positioned on the first surface and the blade is positioned above the second surface.