Vehicle Electronic Key Taking-Out Detection Using Position and Door Status
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Solution Overview
Problem
The existing electronic key systems for vehicles face challenges in accurately detecting when an electronic key has been taken out of a host vehicle, due to variations in communication environments, which can lead to false positives or false negatives.
Innovation Solution
The system employs host vehicle position detection, electronic key information acquisition, and taking-out detection means to accurately determine the electronic key's position relative to the vehicle, using a combination of position and opening/closing door information, and optionally movement locus information, to provide reliable detection and warnings without relying on the communication environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LF signal communication is used to detect electronic key presence, then the system can provide warning when key is taken out, but detection accuracy deteriorates due to communication environment variations
Solution Approach 1:
The patent introduces position detection means and movement locus detection means as intermediary mechanisms. Instead of relying directly on LF signal communication which is affected by obstacles, the system uses position information and movement trajectory data as intermediaries to infer key taking-out status. This mediator approach allows accurate detection without being influenced by communication environment variations.
2Measurement precision
If response-based detection is used, then the system can detect key presence, but false positives occur when obstacles block communication
Solution Approach 1:
The patent implements preliminary action by detecting position information and movement locus information before making a taking-out determination. The system continuously tracks the key's position and movement pattern, establishing a baseline of normal behavior. When the key is actually taken out, the pre-collected position and movement data show abnormal patterns, enabling accurate detection without false positives from communication obstacles.
3Reliability
If position detection means is added to improve detection accuracy, then taking-out detection becomes more reliable, but device complexity increases
Solution Approach 1:
The patent applies universality by designing position detection means and movement locus detection means that serve multiple functions. These components not only detect key position for taking-out determination but also provide data for authentication, access control, and other vehicle systems. This multi-functionality reduces overall system complexity despite adding detection capabilities.
Data Source
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AI summary
An object of the invention is to provide an electronic key system for a vehicle capable of accurately detecting that an electronic key has been taken out of a host vehicle. An electronic key system for a vehicle according to the invention which allows the start of a host vehicle when an electronic key of the host vehicle is authenticated includes electronic key information acquisition means for acquiring information relating to the position of the electronic key, taking-out detection means for detecting that the electronic key has been taken out of the host vehicle on the basis of the information relating to the position of the electronic key acquired by the electronic key information acquisition means, and alarm means for providing a warning to notify that the electronic key has been taken out of the host vehicle.