Magnetic Angle Sensor Error Detection via Signal Path Segmentation
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Solution Overview
Problem
Magnetic sensors in automotive steering systems face challenges due to changing sensitivity levels and nonlinearity errors caused by temperature changes, leading to inaccurate angle measurements, which can result in incorrect motor torque output and potentially hazardous steering issues.
Innovation Solution
A magnetic angle measurement system with multiple independent signal processing paths and fault detection circuitry is implemented, using a combination of anisotropic magnetoresistive and tunneling magnetoresistive sensors to determine discrepancies in angle measurements and flag errors, ensuring accurate motor control by selecting reliable angle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent signal processing paths are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the sensing function into multiple independent signal processing paths (first, second, and third paths), each processing signals from different sensor combinations. This segmentation allows independent error detection for each path while maintaining overall system reliability.
Solution Approach 2:
A processor acts as an intermediary that receives data from multiple signal processing paths, compares the results, and determines the final angle measurement. This intermediary component coordinates the multiple paths and resolves discrepancies between them.
2Measurement precision
If multiple sensors and signal processing paths are used, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple signal processing paths are designed to process signals from different sensor combinations using similar processing logic. This multi-functionality allows the system to achieve higher measurement precision through redundancy while using standardized processing approaches that simplify manufacturing.
3Reliability
If fault detection circuitry is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The processor continuously compares angle measurements from multiple signal processing paths and provides feedback on discrepancies. When faults are detected in certain paths, the system automatically adjusts by relying on healthy paths, creating a self-monitoring feedback mechanism that improves reliability without requiring complex additional circuitry.
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 system effectively detects and flags sensor errors, ensuring accurate motor control and maintaining steering functionality by determining the correct angle measurement, even in the presence of faults, thus enhancing the reliability and safety of the automotive steering system.
Implementation Method 1
A first sensor has a first plurality of outputs and a second sensor has a second plurality of outputs. The first sensor may be an anisotropic magnetoresistive sensor and the second sensor may be a tunneling magnetoresistive sensor.
Data Source
Figure 1A~1B
Figure 2A
Figure 3
AI summary
A magnetic angle measurement system having magnetic angle sensors, signal processing circuitry and a processor is disclosed. First signal processing circuitry receives a first subset of outputs of a first plurality of outputs from a first magnetic angle sensor and determines first magnetic angle data based on the received first subset of outputs. Second signal processing circuitry receives a second subset of the outputs from the first magnetic angle sensor and determines second magnetic angle data based on the received second subset of outputs. Third signal processing circuitry receives a second plurality of outputs from the second magnetic sensor and determines third magnetic angle data based on the received second plurality of outputs. The processor compares the magnetic angle data and determines a processing result based on the comparison, where fault tolerance resolution of the magnetic angle measurement system is based at least in part on the processing result.