Keyless Entry Cabin Presence Detection Auto-Lock
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Solution Overview
Problem
Smart entry systems with auto-lock functions may inadvertently lock vehicle doors when the vehicle door open detection switch fails, leading to unavailability of smart unlock functionality if a portable device is left inside the cabin.
Innovation Solution
A keyless entry system that includes a vehicle-cabin-inside portable determination section and a disabled state release section, which performs vehicle-cabin-outside collation to exclude portable devices in a disabled state, allowing smart unlock and auto-lock functions to operate correctly even if the door open detection switch fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system disables a portable device left in the vehicle cabin and collates a portable device, then security against unauthorized access is improved, but the smart unlock function becomes unavailable when the door open detection switch fails
Solution Approach 1:
The system performs preliminary detection of portable devices inside the vehicle cabin before executing the auto-lock function. By checking for the presence of authorized portable devices in advance, the system可以避免 disabling devices that were legitimately left inside, thereby preventing the loss of smart unlock functionality while maintaining security against unauthorized access.
2Reliability
If the auto-lock function locks the vehicle door after a predetermined time, then prevention of forgotten door locking is improved, but lockout of users with portable devices left inside occurs when the door switch fails
Solution Approach 1:
The system incorporates feedback by continuously monitoring the status of portable devices inside the vehicle cabin during the auto-lock timing period. When the door open detection switch fails to detect door opening, the system uses feedback from portable device detection to determine whether to execute the auto-lock function, thereby avoiding user lockout while still preventing forgotten door locking under normal conditions.
3Reliability
If the system performs vehicle-cabin-outside collation excluding disabled portable devices, then security against radio wave leakage is improved, but the system complexity increases
Solution Approach 1:
The collation system is segmented into two distinct modes: vehicle-cabin-inside collation for security verification and vehicle-cabin-outside collation for smart unlock authorization. By dividing the collation process into separate functional segments with different criteria, the system achieves enhanced security against radio wave leakage while managing complexity through modular design where each segment has a specific purpose.
Data Source
AI summary
A keyless entry system including multiple portable devices and an in-vehicle device controlling smart lock and smart unlock of a vehicle door is disclosed. The in-vehicle device includes an vehicle-cabin-inside portable determination section, which when locking the vehicle door by the auto-lock function, determines whether or not there is the portable device located inside the vehicle cabin, and a disabled state release section that releases the disabled states of all of the portable devices when the vehicle-cabin-inside portable determination section determines that there is no portable device located inside the vehicle cabin.