Working Tool Cylinder Control for Accurate Swing Position Sensing
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Solution Overview
Problem
Existing working machines face challenges in accurately determining the swing position of a working tool due to low hydraulic pressure, leading to rattling and erroneous position determination.
Innovation Solution
A working machine with an arm, a swingable working tool, a working tool cylinder, a cylinder sensor, a control valve, and a controller that adjusts the accuracy of determining the swing position based on the operating status of the working tool cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sampled output signals of the angle sensor is increased to improve the accuracy of determining the swing position, then the measurement precision is improved, but the time required to determine the swing position increases
Solution Approach 1:
The patent applies dynamics by making the sampling strategy adaptive rather than static. The controller dynamically adjusts the number of sampled output signals based on the operating status of the working tool cylinder. When the cylinder is in a stable state, more samples are taken to improve accuracy. When the cylinder is operating (extending or retracting), fewer samples are taken to reduce determination time and follow the operating speed of the working tool.
Solution Approach 2:
The patent changes the parameter of sampling number based on the operating status of the working tool cylinder. The controller modifies the determination accuracy parameter dynamically - using higher accuracy (more samples) when the cylinder is stationary and lower accuracy (fewer samples) when the cylinder is extending or retracting, thus optimizing the balance between measurement precision and response time.
2Force
If the opening of the control valve is increased to improve the hydraulic pressure acting on the working tool cylinder, then the force is improved, but the working tool cylinder and working tool may still rattle due to looseness in support portions
Solution Approach 1:
The patent uses feedback from the cylinder sensor to detect the operating status of the working tool cylinder. The controller continuously monitors the cylinder's state and uses this feedback information to adjust the determination accuracy of the swing position. When rattling occurs due to low hydraulic pressure, the system can identify this state through sensor feedback and appropriately adjust its determination strategy.
Solution Approach 2:
The system dynamically adjusts the swing position determination accuracy based on the real-time operating status of the working tool cylinder. When the cylinder is in a stable stationary state, high accuracy determination is performed. When the cylinder is operating or experiencing rattling, the determination accuracy is adjusted accordingly, allowing the system to maintain reliable position determination despite variable hydraulic pressure conditions.
3Ease of operation
If the working tool cylinder operates with small opening of control valve to improve the ease of operation, then the ease of operation is improved, but the hydraulic pressure is low causing rattling and erroneous position determination
Solution Approach 1:
The patent makes the determination accuracy dynamic based on operating conditions. When the manual operator operates with small opening (easy operation), the system detects the low hydraulic pressure state through cylinder sensor feedback and adjusts the sampling strategy accordingly. This allows easy operation to be maintained while the system compensates for reduced measurement precision by using appropriate sampling rates based on the detected operating status.
Solution Approach 2:
The controller changes the determination accuracy parameter according to the operating status detected from the cylinder sensor. When small control valve opening is detected (indicating low hydraulic pressure and potential rattling), the system adjusts its measurement parameters to maintain reliable position determination despite the reduced hydraulic pressure conditions.
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 solution allows for appropriate determination of the working tool's swing position, enhancing accuracy and preventing erroneous determinations, even under conditions of low hydraulic pressure.
Implementation Method 1
a working tool cylinder to swing the working tool by extending or retracting, one end portion of the working tool cylinder being supported on the arm via a cylinder shaft
Implementation Method 2
a control valve that controls flow of a hydraulic fluid to the working tool cylinder
Implementation Method 3
an angle sensor that detects a swing angle of the working tool cylinder
Data Source
AI summary
A working machine includes an arm, a working tool swingably attached to the arm, a working tool cylinder to swing the working tool by extending or retracting, one end portion of the working tool cylinder being supported on the arm via a cylinder shaft, the opposite end portion of the working tool cylinder being supported on the working tool, a cylinder sensor to detect an operation of the working tool cylinder, a control valve to extend or retract the working tool cylinder by controlling flow of a hydraulic fluid to the working tool cylinder, and a controller to periodically determine a swing position of the working tool based on an output value of the cylinder sensor, and the controller changes the accuracy of determining the swing position of the working tool in accordance with an operating status of the working tool cylinder.