Vehicle Key Device Misplacement Detection After Door Locking
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Solution Overview
Problem
Existing systems fail to accurately detect the presence of an information processing device inside a vehicle, leading to potential misplacement without alerting the user.
Innovation Solution
A vehicle system that includes a confirmation section to verify the presence of an information processing device, a determination section to detect movement or vibration within a predetermined time after door locking, and an actuation section to sound an alarm if no movement is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system relies solely on confirmation of information processing device presence at door locking time, then false alarms are reduced, but misplacement detection accuracy deteriorates
Solution Approach 1:
The system performs preliminary detection of the information processing device presence at door locking time, then continues monitoring for movement or vibration signals in the subsequent period. This preliminary action allows the system to prepare for potential misplacement scenarios while maintaining the ability to detect devices that were initially missed, thereby resolving the contradiction between reducing false alarms and improving detection accuracy.
Solution Approach 2:
The system uses feedback from multiple detection stages: first confirming device presence at door locking time, then monitoring for movement or vibration signals in the period following door locking. If no movement is detected and the device was not confirmed present, the alarm is actuated. This multi-stage feedback mechanism improves overall detection accuracy while maintaining reliability by only alarming when both conditions are met.
2Object-generated harmful factors
If the system actuates alarm only when device presence is confirmed, then false alarms are minimized, but user awareness of misplacement is reduced
Solution Approach 1:
The system performs preliminary confirmation of device presence at door locking time, then continues monitoring for movement signals. By establishing this preliminary check and extending monitoring into the post-locking period, the system can identify misplacement scenarios that would otherwise go undetected, ensuring users are notified of actual misplacement while maintaining low false alarm rates.
Solution Approach 2:
The alarm actuation decision is based on feedback from two conditions: whether the device was confirmed present at door locking time, and whether movement or vibration was detected in the subsequent monitoring period. Only when both conditions indicate misplacement (device not confirmed present AND no movement detected) does the alarm activate, optimizing the balance between false alarm reduction and misplacement notification.
3Measurement precision
If the system monitors for vibration or movement after door locking, then misplacement detection is improved, but system complexity increases
Solution Approach 1:
The system replaces complex continuous monitoring mechanisms with a simpler approach: checking for movement or vibration signals only during a specific time period after door locking. This substitution of a simplified temporal monitoring window for continuous complex monitoring maintains high misplacement detection accuracy while reducing overall system complexity.
Solution Approach 2:
The system establishes a predetermined monitoring period following door locking during which movement or vibration signals are detected. This preliminary definition of the monitoring window simplifies the detection system by limiting continuous monitoring to a specific timeframe, thereby improving misplacement detection accuracy without proportionally increasing system complexity.
Data Source
AI summary
A vehicle includes a confirmation section that confirms, at a time of vehicle door locking, whether or not an information processing device configured to be used to perform the vehicle door locking, is inside the vehicle; a determination section that, in a case in which it has not been confirmed by the confirmation section that the information processing device is inside the vehicle, determines whether or not vibration or movement of the information processing device has been detected within a predetermined period of time from the door locking; and an actuation section that, in a case in which vibration or movement of the information processing device has not been detected by the determination section, actuates an alarm.