Magnetic Switch Sensing Layout for Sensor Failure Detection
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Solution Overview
Problem
Existing vehicle switch devices are susceptible to operation detection failures when the detection means fail.
Innovation Solution
A switch device with a movable body and a magnet that is displaced in conjunction with the operation, utilizing multiple magnetic force sensors arranged to detect changes in magnetic force, including at least one sensor facing away from the magnet, allowing for redundancy and failure detection through signal comparison.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple magnetic force sensors are used to detect changes in magnetic force, then reliability of operation detection is improved, but device complexity increases
Solution Approach 1:
The detection function is segmented into multiple magnetic force sensors positioned at different locations around the magnet. Each sensor independently detects magnetic force changes, and their combined output provides redundant detection capability. This segmentation allows the system to maintain operation detection reliability even when individual sensors fail.
Solution Approach 2:
Multiple magnetic force sensors are merged into a unified detection system where their signals are processed together. The sensors are arranged around the magnet in a specific configuration, and their combined output determines switch operation status. This merging provides redundancy and improves reliability while managing complexity through integrated signal processing.
2Reliability
If at least one sensor is disposed with detection surface facing away from the magnet, then failure detection capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sensor arrangement employs asymmetry by positioning at least one sensor with its detection surface facing away from the magnet, opposite to the conventional configuration where all sensors face the magnet. This asymmetric arrangement creates distinct magnetic force change patterns that enable failure detection. The inverted sensor responds differently to magnet displacement, providing a reference for detecting sensor malfunctions.
Solution Approach 2:
The system uses feedback from multiple sensors including the inverted sensor to monitor each other's performance. By comparing the output signals from sensors facing the magnet with the inverted sensor, the system can detect anomalies indicating sensor failure. This mutual feedback mechanism enables automatic failure detection without requiring additional complex monitoring systems.
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
Ensures reliable operation detection by identifying and compensating for sensor failures, maintaining functionality even when individual sensors malfunction.
Implementation Method 1
a plurality of magnetic force sensors 7 arranged facing the magnet 10, including a magnetic force sensor 7 with a detection surface 7a facing away from the magnet 10
Data Source
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AI summary
A switch device includes: a movable body that is displaced in an axial direction in conjunction with an operation of an operated portion; a magnet provided on the movable body; and a plurality of magnetic force sensors (detection elements) arranged facing the magnet. At least three magnetic force sensors are provided. At least one of the plurality of magnetic force sensors is disposed in a reversed orientation.