Dynamic Offset and Amplitude Tracker for Sensor Signal Adjustment
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Solution Overview
Problem
Existing sensors, particularly those using magnetic field sensing elements, face challenges in accurately tracking the angular position of rotating targets due to variations in gain and offset adjustments, especially when signals lack well-defined peaks, and existing methods require specific peak conditions for adjustment.
Innovation Solution
A method and system for a sensor that adjusts signals indicative of a rotating target's angular position using a processing circuitry to update gain and offset adjustment coefficients by minimizing a cost function, allowing for precise adjustments even in the absence of well-defined peaks, through gradient descent and phase adjustment, enabling accurate angular position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional peak-based adjustment methods are used, then adjustment reliability is improved when peaks are well-defined, but measurement precision deteriorates when signals lack well-defined peaks
Solution Approach 1:
The patent changes the parameter used for adjustment from peak-based detection to cost function minimization based on signal slope and curvature. This allows the system to adapt to different signal characteristics and maintain measurement precision even when peaks are not well-defined, resolving the contradiction between reliability and precision in different operating conditions
Solution Approach 2:
The patent replaces the mechanical/physical peak-detection mechanism with a mathematical optimization approach using cost functions and gradient descent. This substitution enables the system to achieve accurate adjustments without relying on well-defined peaks, thereby improving measurement precision across a broader range of signal conditions
2Adaptability or versatility
If gain and offset adjustments are performed continuously, then adaptability is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The patent implements self-service adjustment where the system automatically optimizes gain and offset parameters by minimizing its own cost function without external intervention. The gradient descent algorithm continuously adapts the parameters based on signal characteristics, providing high adaptability while keeping the adjustment mechanism relatively simple and integrated within the existing sensor architecture
3Measurement precision
If adjustment coefficients are updated frequently, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent employs periodic action by updating adjustment coefficients at specific intervals or when signal characteristics change significantly, rather than continuously. The cost function minimization is performed periodically to balance measurement precision with processing time, allowing the system to maintain accurate angular position measurements while avoiding excessive computational overhead
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 enables accurate and adaptive adjustment of gain and offset coefficients, improving the sensor's ability to track angular positions with signals that may not have well-defined peaks, enhancing the sensor's operational range and reliability in various applications.
Implementation Method 1
generating a signal that is indicative of an angular position of a rotating target, the signal being generated by at least one magnetic field sensing element
Data Source
AI summary
A method for use in a sensor, comprising: generating a signal that is indicative of an angular position of a rotating target, the signal being generated by at least one magnetic field sensing element; adjusting the signal to produce an adjusted signal, the signal being adjusted based on a current value of a first adjustment coefficient and a current value of a second adjustment coefficient, the first adjustment coefficient including a gain adjustment coefficient, and the second adjustment coefficient including an offset adjustment coefficient; generating an output signal based on the adjusted signal; and updating the first adjustment coefficient, the updating including replacing the current value of the first adjustment coefficient with a new value of the first adjustment coefficient, the updating being performed by minimizing a function that is based on the current value of the first adjustment coefficient and the current value of the second adjustment coefficient.