Motor Grader Frame Position Tracking via Vector Loop Equations
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Solution Overview
Problem
Precise control and tracking of the position of working implements in agricultural machines, such as motor graders, is complex due to the multiple degrees of freedom and parallel linkage systems, making it difficult to accurately determine the position of the blade relative to the main frame.
Innovation Solution
A motor grader is equipped with a main frame, a secondary frame movable relative to the main frame, and a linkage system comprising hydraulic cylinders and sensors, where a processor estimates the position of the secondary frame by solving vector loop equations based on cylinder lengths and sensor data, allowing for precise adjustment and control of the blade's position in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple hydraulic cylinders and parallel linkage systems are used to control the blade position, then the blade can be adjusted in multiple directions with high versatility, but the system complexity increases making position tracking difficult
Solution Approach 1:
The complex parallel linkage system is segmented into multiple independent vector loops, each associated with a specific hydraulic cylinder. This segmentation allows the overall complex system to be analyzed and controlled through simpler, modular vector loop equations, making position tracking feasible despite the high versatility of the multi-directional blade adjustment capability.
2Measurement precision
If operators manually control multiple operational frames to position the blade, then precise control can be achieved, but the ease of operation decreases due to the complex coordination required
Solution Approach 1:
A feedback mechanism is implemented where sensors continuously monitor the actual positions of the operational frames and hydraulic cylinders, and this information is fed back to the control system. The control system compares the actual blade position with the desired position and automatically adjusts the hydraulic cylinders to eliminate position errors, maintaining precision while significantly reducing operator difficulty.
Solution Approach 2:
The manual mechanical control system is replaced with an automated electronic control system that uses processors to solve vector loop equations and control hydraulic actuators. This substitution maintains precise blade positioning capability while eliminating the need for operators to manually coordinate multiple complex operational frames.
3Measurement precision
If vector loop equations are solved to estimate secondary frame position, then measurement precision of blade position is improved, but the computational complexity and time required increases
Solution Approach 1:
The vector loop equations are pre-configured and stored in the control system during system setup or initialization. When position calculation is needed, the system only needs to substitute current sensor measurements into the pre-established equations rather than deriving the equations from scratch, significantly reducing computational time while maintaining high position accuracy.
Solution Approach 2:
The position estimation system operates dynamically by continuously updating the vector loop calculations at high frequency using real-time sensor data. This dynamic operation allows the system to maintain accurate position tracking without excessive computational delay, adapting quickly to changes in blade position while solving the vector loop equations efficiently.
Data Source
AI summary
A motor grader including a main frame, an operational frame movable relative to the main frame in three directions, and a linkage system coupling the operational frame to the main frame. The linkage system includes a plurality of hydraulic cylinders each movable between an extended position and a retracted position to adjust the length thereof. The plurality of cylinders is operationally connected such that movement of one cylinder of the plurality of cylinders causes movement of at least another cylinder of the plurality of cylinders. A processor is configured to receive a signal related to the length of at least one cylinder of the plurality of cylinders, and estimate, based in part on the signal, a position of the operational frame relative to the main frame in the three directions.