Boundary Wire Signal Gain Control for Mobile Position Detection
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Solution Overview
Problem
Automatic moving devices face interference from electromagnetic fields generated by motors, adjacent working regions, and external electromagnetic waves, leading to misjudgment of their position within a working region, which affects their control and operation.
Innovation Solution
The system employs a control method that adjusts the detection signal by amplifying it using a programmable or fixed gain amplifier, comparing extreme points with preset threshold values, and adjusting the amplification factor to ensure the signal remains within a defined range, thereby reducing interference and improving signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection signal is amplified to improve position detection accuracy, then measurement precision is improved, but interference signals from motors and external electromagnetic waves are also amplified, worsening reliability
Solution Approach 1:
The system uses feedback control by continuously monitoring the detection signal and adjusting the amplification factor dynamically. The processor compares the detection signal with threshold values and adjusts the amplification factor of the programmable gain amplifier to maintain the signal within an optimal range, thereby improving position detection accuracy while suppressing interference signals.
Solution Approach 2:
The patent changes the parameter of amplification factor from a fixed value to a dynamically adjustable parameter. By using a programmable gain amplifier, the system can adjust the amplification factor in real-time based on the detected signal strength, ensuring that weak boundary wire signals are amplified sufficiently while strong interference signals are not over-amplified.
2Measurement precision
If a programmable gain amplifier is used to dynamically adjust signal amplification, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The processor in the automatic moving device serves multiple functions: it processes detection signals, controls the programmable gain amplifier, compares signals with thresholds, and adjusts amplification factors. By making the processor multi-functional, the system reduces the need for separate dedicated hardware components for each function, thereby managing device complexity while maintaining measurement precision.
Solution Approach 2:
The system uses the automatic moving device's own processor to control the signal amplification process, eliminating the need for external control devices. The processor automatically adjusts the amplification factor based on the detection signal characteristics, making the system self-regulating and reducing overall hardware complexity.
3Measurement precision
If the amplification factor is increased to detect weak boundary wire signals, then measurement precision is improved, but interference signals from motors and external sources are also amplified, worsening reliability
Solution Approach 1:
The system transitions from a static amplification factor to a dynamic one that changes based on real-time signal conditions. The programmable gain amplifier's amplification factor is continuously adjusted according to the detected signal strength and interference level, allowing the system to optimize detection of weak boundary wire signals while suppressing interference dynamically.
Solution Approach 2:
The system implements feedback control by monitoring the detection signal and adjusting the amplification factor accordingly. When weak boundary wire signals are detected, the amplification factor is increased; when strong interference signals are present, the amplification factor is reduced, thereby maintaining measurement precision while minimizing the impact of harmful interference factors.
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
This approach effectively filters out interference signals, enhancing the system's anti-interference capacity and ensuring accurate detection of the device's position within the working region, improving operational efficiency and reducing hardware complexity.
Implementation Method 1
a boundary wire 50, on which a current signal is imposed, thereby generating an electromagnetic field
Implementation Method 2
at least one detecting device 110 for detecting the electromagnetic field
Data Source
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AI summary
The present invention discloses a control method of an automatic working system, which comprises the following steps: a signal generating device generates a boundary signal; the boundary signal flows through the boundary wire to generate an electromagnetic field; a detecting device on an automatic moving device detects the electromagnetic field to generate a detection signal, amplify the detection signal to form a gain signal, compare an feature point of the gain signal with a preset condition, the preset condition comprising: the feature point is lower than an upper threshold value and higherthan a lower threshold value, then automatically adjust the gain signal according to a comparing result, such that the feather point of the gain signal formed after adjusting accords with the preset condition, further to process the gain signal,The present invention also relates to an automatic working system and an automatic moving device, which execute the above control method, and the control method, automatic working system and automatic moving device have a flexible signal adjusting capacity, can effectively recognize an effective signal, and have higher capacities of motor interference resistance, adjacency resistance and ambient interference resistance.