Vehicle Sensor Device Magnetic Field Interference Compensation
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Solution Overview
Problem
Existing sensor devices for vehicles are ineffective in differentiating and mitigating the effects of external magnetic fields, which can interfere with sensing magnetic fields, leading to protection gaps and increased costs due to the need for additional shielding and specialized components.
Innovation Solution
A sensor device configuration with multiple magnetic field sensors that differentiate the effects of sensing and external magnetic fields, allowing for detection and compensation of interference, thereby enhancing protection without additional sensors or expensive components, and enabling a wider measuring range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metallic shields or additional sensors are used to protect against external magnetic fields, then protection against interference is improved, but device complexity and cost increase
Solution Approach 1:
The sensor device is divided into multiple magnetic field sensors with different sensitivity characteristics. Each sensor responds differently to external magnetic fields, allowing the system to segment the detection function and identify interference patterns through comparative analysis of individual sensor responses.
Solution Approach 2:
The existing magnetic field sensors serve dual purposes: they detect the sensing magnetic field for primary measurement functions and simultaneously detect external magnetic field interference through their differential responses. This multi-functionality eliminates the need for separate protection mechanisms.
2Object-affected harmful factors
If metallic shields or additional sensors are used to protect against external magnetic fields, then protection against interference is improved, but manufacturing cost increases
Solution Approach 1:
The existing magnetic field sensors serve dual purposes: they detect the sensing magnetic field for primary measurement functions and simultaneously detect external magnetic field interference through their differential responses. This multi-functionality eliminates the need for separate protection mechanisms.
Solution Approach 2:
The sensor device uses its own existing sensors to detect and identify external magnetic field interference without requiring additional specialized components. The system self-services by utilizing the differential response characteristics of its built-in sensors for both primary measurement and interference detection.
3Adaptability or versatility
If the measuring range is extended to accommodate wider magnetic field detection, then measurement capability is improved, but susceptibility to external interference increases
Solution Approach 1:
The sensor device is divided into multiple magnetic field sensors with different sensitivity characteristics. Each sensor responds differently to external magnetic fields, allowing the system to segment the detection function and identify interference patterns through comparative analysis of individual sensor responses.
Solution Approach 2:
The system uses feedback from multiple sensors to continuously monitor and identify external magnetic field interference. By comparing responses from sensors with different sensitivities, the system can detect interference patterns and compensate for their effects, maintaining accurate measurements even with extended measuring range.
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
This configuration provides robust protection against external magnetic fields, meets safety standards, and reduces costs by allowing for a higher Automotive Safety Integrity Level (ASIL) and extended measuring range with existing technology, while avoiding interference with the sensing magnetic field.
Implementation Method 1
at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet
Implementation Method 2
the resultant magnetic field from the sensing magnetic field and an external magnetic interference field from an interference source develops a different size of the effect obtained with respect to signal values in the relevant magnetic field sensors
Data Source
AI summary
A sensor device for a vehicle, including: at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet; in which the magnetic field sensors are configured so that the resultant magnetic field from the sensing magnetic field and an external magnetic interference field from an interference source develops a different strength of effect in different magnetic field sensors. Also described are a related method, control apparatus/unit, sensor system, and computer readable medium.