Wheel Loader Blade Control System for Precise Land Levelling
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Solution Overview
Problem
Wheel loaders face challenges in precise land levelling and earthmoving processes due to their higher centre of gravity and independent axle dampers, leading to difficulties in maintaining the correct position and orientation of the levelling tool relative to the working plane, especially when performing tasks that require a predefined working plane.
Innovation Solution
A machine control system for wheel loaders that includes a machine control unit (MCU) and an orientation detection system with angle encoders, inertial measuring units, and external surveying means to detect and adjust the position and orientation of the levelling tool relative to the working plane, allowing for precise control and automatic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wheel loaders are used for land levelling and earthmoving processes, then operating costs are reduced and mobility is improved, but the ability to maintain precise position and orientation of the levelling tool deteriorates due to higher centre of gravity and independent axle dampers
Solution Approach 1:
The patent implements a machine control system that continuously measures the actual position and orientation of the levelling tool using sensors and orientation detection means, compares these measurements with the desired position and orientation, and automatically adjusts the tool positioning means to eliminate deviations. This closed-loop feedback control enables precise land levelling operations while maintaining the mobility advantages of wheel loaders.
Solution Approach 2:
The patent replaces manual mechanical control with an automated electronic control system. The machine control unit (MCU) processes sensor data and sends hydraulic control signals to the tool positioning means, substituting the operator's manual mechanical adjustments with an automated electromechanical system that maintains precise tool positioning despite vehicle movements.
2Device complexity
If manual control is used for land levelling processes, then device complexity is low, but measurement precision and control accuracy of tool position and orientation deteriorate
Solution Approach 1:
The patent replaces manual visual estimation and mechanical feedback with an electronic measurement and control system. Sensors mounted on the levelling tool and orientation detection means provide precise digital measurements of tool position and orientation, which are processed by the MCU to achieve accurate control that would be impossible through manual operation alone.
Solution Approach 2:
The patent introduces sensors and orientation detection means as intermediary elements between the physical tool position and the control system. These intermediaries convert physical parameters (position, orientation) into measurable signals that can be processed electronically, enabling precise measurement and control while keeping the overall system architecture manageable.
3Manufacturing precision
If automatic control is implemented to maintain precise tool position and orientation, then land levelling accuracy is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent integrates multiple functions into the machine control system: sensors serve both as measurement devices and as triggers for control actions; the MCU performs both data processing and hydraulic control signal generation; the tool positioning means serve both as support structures and as active control elements. This multi-functionality reduces the need for separate dedicated components, managing system complexity while achieving precise land levelling.
4Device complexity
If the levelling tool is manually positioned and oriented, then device complexity is low, but productivity and precision of land levelling processes deteriorate
Solution Approach 1:
The patent implements a self-regulating control system where the machine control unit continuously monitors tool position and orientation through sensors and automatically makes adjustments without operator intervention. The system serves itself by detecting deviations and correcting them autonomously, enabling continuous high-precision operation that increases productivity beyond what manual control can achieve.
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
The system enhances the accuracy and stability of land levelling and earthmoving processes by providing real-time feedback and automatic adjustments, reducing operator effort and improving the precision of maintaining the correct height and tilt angle of the levelling tool.
Implementation Method 1
The orientation detecting system comprises at least one angle encoder for measuring, with three rotational degrees of freedom, an angle between the front body and a first member of the tool positioning means, between two members of the tool positioning means and/or between a last member of the tool positioning means and the levelling tool
Implementation Method 2
an angle encoder at the articulated steering joint for measuring at least a vertical angle between the front body and the rear body
Implementation Method 3
an inertial measuring unit for measuring translational and/or rotational accelerations of the levelling tool
Data Source
Figure 1a
Figure 1b
Figure 2~3b
AI summary
Machine control system for controlling a land levelling or earthmoving process of a wheel loader (100) relative to a working plane (1), the wheel loader (100) being equipped with a land levelling or earthmoving blade (140-142) and comprising tool positioning means (115) for adjusting the position and orientation of the tool relative to the first body (110), wherein the machine control system comprises a machine control unit (10) and an orientation detection system, characterized in that the orientation detection system comprises orientation detection means which are designed to be attached to the blade (140-142) and/or to the wheel loader (100) for detecting a position and an orientation of the blade (140-142) relative to a working plane (1), the orientation detection means are adapted to generate orientation data according to the relative position and orientation of the blade (140-142) and to transmit the orientation data to the machine control unit (10), and the machine control unit (10) is adapted for generating and displaying a graphic representation of the wheel loader (100) and the blade (140-142) with a position and orientation of the blade (140-142) relative to the working plane (1) based on the orientation data, and/or at least partially controlling the land levelling or earthmoving process by automatically operating the tool positioning means (115) for adjusting the position and orientation of the blade (140-142) relative to the working plane (1) based on the orientation data.