Portable Device Motion Sensor Self-Diagnosis
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Solution Overview
Problem
Existing smart entry systems for vehicles face challenges in quickly identifying and notifying users of abnormalities in motion sensors, such as acceleration sensors, which can restrict system functionality.
Innovation Solution
A portable device and vehicle system that includes a motion sensor, a control unit to determine abnormality based on sensor output, and an output unit to notify users of any detected issues, with features like comparing acceleration differences to gravitational acceleration and performing test operations during prolonged stationary states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motion sensor is mounted to a portable device to detect user motion and improve service, then the service functionality is improved, but it becomes difficult to quickly specify when the service restriction is caused by abnormality in the motion sensor
Solution Approach 1:
The motion sensor performs self-diagnosis through test operations that it executes autonomously during stationary periods. The sensor generates test output data by applying known test inputs to itself, comparing the results against expected values, and determining its own operational status without requiring external diagnostic equipment or user intervention.
Solution Approach 2:
The system performs preliminary diagnosis by monitoring motion sensor output during stationary periods before actual use. Test operations are executed in advance during idle time, allowing the system to detect abnormalities before they affect service functionality. This proactive approach enables early identification and notification of sensor issues.
2Reliability
If the portable device continuously monitors motion sensor output to detect abnormalities, then abnormality detection capability is improved, but energy consumption increases
Solution Approach 1:
The system performs test operations periodically during stationary periods rather than continuously. The control unit determines when the portable device has been stationary for a predetermined time period, then triggers test operations at these intervals. This periodic monitoring approach maintains abnormality detection capability while significantly reducing energy consumption compared to continuous monitoring.
3Measurement precision
If test operations are performed frequently to ensure accurate abnormality detection, then detection accuracy is improved, but the device operation complexity increases
Solution Approach 1:
The system applies different monitoring strategies to different operational states of the portable device. During stationary periods, comprehensive test operations are performed with high precision. During active use, the system relies on normal operational data without triggering additional test operations. This localized approach ensures high detection accuracy when conditions permit while avoiding unnecessary complexity during normal operation.
Data Source
AI summary
A portable device communicates with a vehicle, and the portable device includes: a motion sensor; a control unit configured to determine whether or not abnormality has occurred in the motion sensor, based on an output from the motion sensor; and an output unit configured to perform an output representing abnormality in the motion sensor, when the control unit determines that abnormality has occurred in the motion sensor.