Pulse Detection Threshold Adaptation Under Signal Interference
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Solution Overview
Problem
Pulse detection devices in electronic control systems for motor vehicles face challenges in reliable operation due to interference from high temperature fluctuations, contamination, strong vibrations, and mechanical tolerances, which affect the accuracy of analog pulse signal processing.
Innovation Solution
A method and device for operating a pulse detection device that adjusts threshold values based on digital signal values, using a decision-making device to output different signal values based on predetermined thresholds and hysteresis, while accounting for amplitude changes and DC components, and dynamically adapting these values to compensate for interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed threshold values are used in the decision-making device, then the device structure remains simple, but the detection accuracy deteriorates under varying environmental conditions such as temperature fluctuations and contamination
Solution Approach 1:
The patent implements dynamic threshold values that automatically adapt to changing environmental conditions. The decision-making device adjusts the first and second threshold values based on detected signal characteristics, enabling the system to maintain detection accuracy across varying temperatures, contamination levels, and mechanical tolerances without requiring manual recalibration or complex fixed threshold mechanisms
Solution Approach 2:
The patent changes the parameter of threshold values from fixed to variable. By continuously adjusting the first and second threshold values based on the analog pulse signal characteristics and hysteresis considerations, the system optimizes detection accuracy for each operating condition while maintaining a relatively simple device structure
2Reliability
If threshold values are adjusted to compensate for interference, then detection reliability improves, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The decision-making device performs self-adjustment of threshold values based on the characteristics of the incoming pulse signals. The system automatically adapts to interference conditions such as temperature fluctuations and contamination by modifying its own threshold parameters, eliminating the need for external adjustment mechanisms or complex compensation circuits
Solution Approach 2:
The patent implements a feedback mechanism where the decision-making device monitors the pulse signal characteristics and uses this information to adjust the threshold values. The hysteresis value is determined as a function of digital signal values from the first and second sets, creating a closed-loop system that continuously optimizes detection reliability while maintaining simple device architecture
3Object-affected harmful factors
If hysteresis value is adjusted as a function of frequency, then the influence of interferences is minimized, but the complexity of the adjustment mechanism increases
Solution Approach 1:
The patent implements dynamic hysteresis adjustment based on the frequency characteristics of the pulse signal. The hysteresis value is automatically modified as a function of the determined frequency, allowing the system to minimize interference influence across different operating speeds and conditions without requiring complex manual adjustment mechanisms or additional hardware components
Data Source
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AI summary
The method involves forming a decision making device (7) with an input (3) and an output (5), and representing a digital converted pulse of an analog pulse signal by a signal value in an input side. An output signal value (P1) is output to an output side when a digital signal value (S) in the input is greater than a predetermined threshold value (H th). Another output signal value (P0) is output in the output side when the digital signal value in the input is smaller than another predetermined threshold value (L th). The threshold values are adjusted based on value sets (M Smax, M Smin). An independent claim is also included for a device for operating a pulse detection device, comprising a decision making device.