Mower Wheel Speed Calibration for Wear-Induced Drift
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Solution Overview
Problem
Garden tools, such as mowers, suffer from accuracy issues during factory debugging and mechanical wear leads to increased speed regulation errors over time.
Innovation Solution
A calibration method for garden tools that involves a control assembly with first and second controllers to synchronize the extremum rotating speeds of symmetrical wheels using detection devices and angle sensors, adjusting the relationship between output signals and rotating speeds to correct deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical regulating handles are used for speed control, then the garden tool can be operated and adjusted, but mechanical wear causes speed regulation errors to increase over time
Solution Approach 1:
The patent replaces the mechanical regulating handle system with an electronic control system. Controllers receive signals from detection devices (sensors) that detect wheel speed, and the controllers electronically adjust motor parameters to maintain accurate speed regulation without mechanical wear. This substitution eliminates the wear problem inherent in mechanical systems while preserving ease of operation.
Solution Approach 2:
The patent implements a feedback mechanism where detection devices continuously monitor the actual wheel speed and send signals to the controllers. The controllers compare the detected speed with the target speed and automatically adjust the motor output to maintain accurate speed regulation. This closed-loop feedback system compensates for any deviations and maintains reliability over time without mechanical wear.
2Manufacturing precision
If factory debugging is performed on garden tools, then initial accuracy can be achieved, but accuracy problems persist and worsen with mechanical wear over time
Solution Approach 1:
The patent replaces mechanical regulating components that are subject to wear with electronic control systems. The electronic controllers and detection devices maintain manufacturing precision levels indefinitely because electronic components do not experience the same wear mechanisms as mechanical parts. This substitution ensures that the accuracy achieved during factory debugging is maintained throughout the product's lifetime.
Solution Approach 2:
The patent incorporates detection devices and control systems that are pre-configured during manufacturing to automatically compensate for any initial deviations. The system performs self-calibration and maintains accuracy without requiring repeated factory debugging or mechanical adjustments over time.
3Adaptability or versatility
If symmetrical wheels are controlled by separate operating mechanisms, then individual wheel control is possible, but deviations between wheel speeds occur due to mechanical wear
Solution Approach 1:
The patent replaces the separate mechanical operating mechanisms with electronic control systems. Each wheel has its own detection device and controller, allowing individual wheel control to be maintained. The electronic controllers receive speed feedback from their respective detection devices and independently adjust motor parameters to ensure both wheels maintain consistent speeds, eliminating deviations caused by mechanical wear while preserving adaptability.
4Measurement precision
If mechanical extremum positions are used for calibration, then speed comparison can be performed, but mechanical wear causes speed differences between wheels
Solution Approach 1:
The patent uses detection devices to continuously monitor wheel speeds and provide feedback to the controllers. During calibration at mechanical extremum positions, the detection devices accurately measure the speeds, and the controllers use this feedback information to adjust and synchronize the wheel speeds. The ongoing feedback mechanism ensures that speed consistency is maintained even after calibration, compensating for any mechanical wear that occurs.
Solution Approach 2:
The patent replaces mechanical speed transmission mechanisms with electronic control systems. The detection devices electronically detect wheel speeds without mechanical contact that would cause wear, and the controllers electronically adjust speeds to maintain consistency. This substitution preserves measurement precision during calibration while ensuring long-term reliability.
Data Source
AI summary
A garden tool includes a control assembly, an operating mechanism, a first wheel and a second wheel. The operating mechanism is provided with a detection device for detecting a displacement of the operating mechanism. The calibration method of the disclosure includes: receiving a deviation correction command; comparing an extremum rotating speed of the first wheel with an extremum rotating speed of the second wheel; and when there is a difference between the extremum rotating speed of the first wheel and the extremum rotating speed of the second wheel, correcting a relationship between an output signal of the detection device and an output rotating speed of the control assembly to enable the extremum rotating speed of the first wheel to be the same as the extremum rotating speed of the second wheel.