Signal Processing System for Steering Angle Detection
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Solution Overview
Problem
Existing signal processing systems for detecting the steering angle of vehicles require two identical configurations, leading to an increase in overall size and complexity, which complicates failure diagnosis and redundancy.
Innovation Solution
A signal processing method and system that utilize a first magnetic detection unit outputting a sine signal and a second magnetic detection unit outputting a cosine signal with a π/2 phase difference, allowing for angle calculation and failure diagnosis using inverse trigonometric functions and comparison of angle information to diagnose unit failures without the need for duplicate detection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two identical signal processing systems are used for failure diagnosis, then reliability is improved, but device size and complexity increase significantly
Solution Approach 1:
The patent combines two detection circuits (sine detection circuit and cosine detection circuit) into a single integrated system. Both circuits share common components including the magnetoresistance element, amplifier, and A/D converter, while only the calculation units are duplicated. This merging approach enables failure diagnosis functionality without requiring two completely separate detection systems, thus reducing overall device size and complexity while maintaining reliability.
Solution Approach 2:
The shared components (magnetoresistance element, amplifier, A/D converter) serve multiple functions: they are used by both the sine detection circuit and cosine detection circuit. This multi-functionality allows the system to achieve failure diagnosis capability without proportionally increasing the number of components, as each shared component contributes to both detection pathways simultaneously.
2Reliability
If two identical signal processing systems are used for failure diagnosis, then reliability is improved, but manufacturing cost and component quantity increase
Solution Approach 1:
The patent merges the sine detection circuit and cosine detection circuit by sharing common components (magnetoresistance element, amplifier, A/D converter). This reduces the total quantity of components needed compared to having two completely separate detection systems, while still providing the redundancy necessary for failure diagnosis.
Solution Approach 2:
Shared components perform multiple functions by serving both detection circuits. The magnetoresistance element, amplifier, and A/D converter are used universally by both sine and cosine detection pathways, reducing the overall component count while maintaining the ability to diagnose failures through comparison of results from both circuits.
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
Enables efficient failure diagnosis of magnetic detection units while reducing the overall size of the signal processing system and determining which unit has caused a failure, ensuring redundancy and reliability in angle detection.
Implementation Method 1
Each of the first magnetoresistance element and the second magnetoresistance element includes four sine magnetoresistance elements and four cosine magnetoresistance elements
Data Source
AI summary
A signal processing method according to the present disclosure is for use in a signal processing system including a first magnetic detection unit, a second magnetic detection unit, and a processing unit. The signal processing method includes an angle calculating step and a failure diagnosis step. The angle calculating step includes transforming, by using an inverse trigonometric function, a sine signal, a cosine signal, and a tangent signal into a first angle signal, a second angle signal, and a third angle signal, respectively. The failure diagnosis step includes making a failure diagnosis of the first magnetic detection unit and the second magnetic detection unit by comparing with each other two or more pieces of angle information selected from first angle information, second angle information, and third angle information.