Vehicle Cabin Magnetic Sensor Layout for Active Field Cancellation
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Solution Overview
Problem
Existing technologies are inadequate in effectively reducing or canceling time-varying magnetic fields in specific regions, particularly in environments with electrical systems like electric vehicles, where exposure to magnetic fields can have adverse health effects.
Innovation Solution
A system comprising magnetic field generators, sensors, and a control system that determines and generates a cancellation magnetic field with the same magnitude but opposite direction to the external magnetic field, using feedback and feed-forward processing to optimize field cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensors are positioned close to the magnetic field source for accurate sensing, then measurement precision is improved, but the sensors are exposed to stronger magnetic fields which may saturate them or reduce reliability
Solution Approach 1:
A non-magnetic barrier or shield is introduced between the magnetic field source and the sensor. This intermediary structure allows the sensor to remain positioned close to the source for accurate measurement while the barrier protects the sensor from direct exposure to excessively strong magnetic fields that would cause saturation or reliability issues.
2Measurement precision
If magnetic field sensors are positioned inside the passenger cabin for direct measurement, then measurement precision is improved, but device complexity increases due to integration requirements
Solution Approach 1:
The magnetic field sensor is integrated into a multi-functional system that combines sensing, signal processing, and cancellation field generation capabilities. This universal approach allows the same platform to perform multiple functions (detection and active cancellation), reducing overall system complexity despite the sensor being positioned inside the passenger cabin for direct measurement.
3Object-affected harmful factors
If traditional magnetic shielding materials are used to reduce magnetic fields, then harmful magnetic field exposure is reduced, but the shielding materials add weight and reduce adaptability to time-varying fields
Solution Approach 1:
Instead of passively blocking magnetic fields with shielding materials, the system uses active cancellation by generating opposing magnetic fields. The harmful time-varying magnetic fields from the motor are converted into useful information that guides the generation of counteracting fields, making the system highly adaptable to changing field conditions without the weight penalty of traditional shields.
Solution Approach 2:
The system transitions from static magnetic shielding to dynamic active cancellation. Sensors continuously monitor time-varying magnetic fields, and control systems dynamically adjust cancellation coil currents in real-time to maintain effective opposition to the changing magnetic field environment, providing adaptability that static shields cannot achieve.
4Object-affected harmful factors
If multiple sensors and generators are positioned around the selected region for comprehensive field cancellation, then magnetic field cancellation effectiveness is improved, but device complexity increases
Solution Approach 1:
The magnetic field cancellation system is divided into multiple independent sensor-generator pairs, each responsible for a specific spatial region or directional component. This segmentation allows comprehensive coverage of the passenger cabin space while maintaining manageable complexity through modular architecture, where each segment can be independently optimized and controlled.
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 achieves significant reduction or cancellation of magnetic fields in selected regions, providing a safer environment by minimizing exposure to harmful magnetic radiation, and is more efficient and adaptable than traditional shielding methods.
Implementation Method 1
one or more magnetic field sensors configured for sensing magnetic fields in at least a portion of, or in vicinity to, said selected region
Implementation Method 2
generating, using one or more magnetic field generators, magnetic fields having opposite direction and same or similar magnitude over time and space
Data Source
AI summary
A passenger vehicle, comprising: a frame of a vehicle; a passenger compartment of the vehicle, including a selected region suitable for presence of people; a magnetic field source configured such that upon electrification, magnetic field radiation is caused in the selected region; a plurality of magnetic field sensors arranged along generally intersecting planes for providing magnetic field sensing data along at least two axes within the selected region; and at least one circuit mounted in the vehicle and electrically connected to the plurality of magnetic field sensors, the at least one circuit being configured to measure the magnetic field radiation in the selected region.