Multilayered Safety Checks for Three-Phase Off-Axis Angle Sensors
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Solution Overview
Problem
Manufacturability and fabrication tolerances in magnetic angle sensors lead to non-ideal sinusoidal signals, reducing reliability and accuracy, necessitating improved monitoring techniques to ensure reliable and accurate operation.
Innovation Solution
A three-phase off-axis angle sensor with multiple functional safety checks that can be performed independently, utilizing delta signals to account for higher order harmonics and implement layered safety monitoring, including reference signal comparison, delta signal window checks, and other checks to enhance functional safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple functional safety checks are implemented to ensure reliability and accuracy, then functional safety is improved, but device complexity increases
Solution Approach 1:
The safety monitoring system is divided into multiple independent functional safety checks (e.g., amplitude check, frequency check, phase check, delta check). Each check operates independently and can be performed separately, allowing the system to segment the complex safety verification into manageable, parallelizable components that do not interfere with each other.
Solution Approach 2:
The system performs safety checks selectively rather than exhaustively. Depending on operational requirements and signal conditions, the system can perform a subset of available safety checks (partial action) or all checks (excessive action) to ensure adequate safety coverage without unnecessary computational overhead.
2Reliability
If all functional safety checks are performed continuously to maximize monitoring coverage, then reliability is improved, but processing time and resource consumption increase
Solution Approach 1:
Safety checks are performed periodically rather than continuously. The system can configure check intervals based on operational requirements, signal stability, and risk levels, performing comprehensive checks during critical phases and reduced-check modes during stable operation to balance monitoring coverage with processing time.
Solution Approach 2:
The system dynamically adjusts the number and type of safety checks performed based on real-time conditions such as signal quality, operational mode, and detected anomalies. When signals are stable, fewer checks are performed; when anomalies are detected or during critical operations, more comprehensive checks are executed.
3Measurement precision
If comprehensive safety checks including reference signal comparison and delta signal analysis are performed, then measurement precision is improved, but computational resources consumed increase
Solution Approach 1:
Different safety checks focus on different local aspects of signal quality. The amplitude check verifies signal strength, the frequency check verifies rotational speed accuracy, the phase check verifies angular position accuracy, and the delta check verifies signal consistency. Each check consumes computational resources proportional to its specific verification needs rather than requiring full comprehensive analysis for all parameters.
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
Enhances reliability and accuracy by selectively performing functional safety checks, balancing speed, resource consumption, and reliability through layered monitoring, effectively mitigating non-ideal signal deviations caused by manufacturing and fabrication issues.
Implementation Method 1
A magnetic angle sensor may sense a magnetic field produced or distorted by a rotating magnet wheel
Data Source
AI summary
A off-axis angle sensor may receive a set of output signals including a first output signal, a second output signal, and a third output signal. The off-axis angle sensor may determine, based on the set of output signals, a set of delta signals including a first delta signal, a second delta signal, and a third delta signal. The off-axis angle sensor may identify a set of functional safety checks, from a plurality of functional safety checks configured on the off-axis angle sensor, for selective performance in association with determining functional safety of the off-axis angle sensor. Each of the plurality of functional safety checks may be performed independently of each of the other functional safety checks. The off-axis angle sensor may perform one or more functional safety checks based at least in part on at least one of: the set of output signals or the set of delta signals.