Wheel Loader Bucket Tilt Control for Precise Discharge Weight
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Solution Overview
Problem
Existing wheel loader systems cause discomfort to operators due to repetitive bucket operations and impose a heavy load on hydraulic drive devices during loading operations, making precise weight adjustment challenging.
Innovation Solution
A wheel loader equipped with a controller that automatically controls bucket operations based on weight sensors, selecting optimal tilt commands to achieve precise loading while minimizing operator discomfort and hydraulic load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the controller repeatedly performs dump operation, tilt operation, and stopping to measure weight, then precise loading weight control is achieved, but operator discomfort increases and hydraulic drive device load increases
Solution Approach 1:
The controller continuously monitors the weight of excavated material through the weight sensor and uses this feedback to dynamically adjust bucket tilt angle and discharge timing, eliminating the need for repeated stop-start operations while maintaining precise weight control
Solution Approach 2:
The system dynamically adjusts the bucket discharge process based on real-time weight measurements, transitioning from static repeated operations to a continuous dynamic control process that maintains precision without interruption
2Measurement precision
If the controller repeatedly performs dump operation, tilt operation, and stopping to measure weight, then precise loading weight control is achieved, but hydraulic drive device load increases
Solution Approach 1:
Real-time weight feedback enables the controller to optimize hydraulic actuation forces, applying only the necessary force to achieve target weight discharge without the excessive forces required by repeated tilt-and-stop operations
Solution Approach 2:
The hydraulic drive device operates continuously in a controlled manner rather than undergoing repeated cycles of engagement and disengagement, reducing peak loads and improving hydraulic system efficiency
3Adaptability or versatility
If the operator manually adjusts bucket discharge weight, then operational flexibility is maintained, but loading precision decreases due to difficulty in observing bucket contents
Solution Approach 1:
The system performs automatic weight measurement and discharge control without requiring operator intervention, with the weight sensor and controller working autonomously to achieve precise loading while maintaining operational flexibility through programmable parameters
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately loads the target weight to the loading target while reducing operator discomfort and hydraulic drive device load, enhancing operational efficiency and precision.
Implementation Method 1
a weight sensor for detecting the weight in the bucket
Data Source
Figure 1
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AI summary
In the wheel loader 1 where the operation of the bucket 23 is automatically controlled by the controller 5, the controller 5 outputs an automatic tilt command signal to the hydraulic drive device 402 in a case where it determines that the decrease amount Wd of the load weight in the bucket 23 associated with the unloading operation has reached the target discharge amount Wt, in a case where it is determined that the decrease amount Wd has not reached the target discharge amount Wt, the controller selects the command signal with the smaller forward tilt angle amount of the bucket 23 from among the first automatic dump command signal that commands the first automatic dump operation and the dump command signal that commands a dump operation in which the bucket 23 tilts forward by an angle amount different from the first angle amount, and outputs it to the hydraulic drive device 402.