Wireless Vehicle Lock Control Using Tiered Key Distance Detection
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Solution Overview
Problem
Existing passive entry and passive start (PEPS) technologies lack precise distance measurement between a smart key and a vehicle, leading to doors being unlocked when the user is far away or requiring the user to be very close for unlocking.
Innovation Solution
A wireless vehicle control device with multiple communication units of varying ranges, including a first communication unit with a larger range and a second communication unit with a smaller range, uses a central management unit to activate the second unit only when the distance is within a default threshold, ensuring accurate vehicle lock control based on communication signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single communication unit with large communication range is used, then the communication range is extended, but the distance measurement precision deteriorates
Solution Approach 1:
The communication unit is segmented into a first communication unit with large communication range and a second communication unit with small communication range. The first communication unit is used for initial pairing and broad detection, while the second communication unit is activated only when the first unit detects a portable electronic device, providing precise distance measurement for controlling vehicle lock functions.
2Measurement precision
If multiple communication units are always activated, then the distance measurement precision is improved, but the power consumption increases
Solution Approach 1:
The system dynamically activates the second communication unit based on detection results from the first communication unit. When the first communication unit detects a portable electronic device, the central management unit activates the second communication unit for precise distance measurement. When no device is detected, the second communication unit remains inactive, optimizing power consumption.
3Manufacturing precision
If the second communication unit is activated continuously, then the distance control accuracy is maintained, but the device complexity increases
Solution Approach 1:
The second communication unit is activated periodically or on-demand based on detection needs rather than continuously. The central management unit controls the activation of the second communication unit only when the first communication unit detects a portable electronic device, reducing system complexity while maintaining accurate distance control when needed.
Data Source
AI summary
A wireless vehicle control device, disposed on a vehicle, includes a first communication unit, at least one second communication unit and a central management unit. The first communication unit is configured to detect a first communication signal of a portable electronic device. The at least one second communication unit is configured to detect a second communication signal of the portable electronic device, wherein a communication range of the at least one second communication unit is smaller than that of the first communication unit. The central management unit is configured to activate the at least one second communication unit to perform detection when determining that the first communication unit is paired with the portable electronic device according to the first communication signal, and control at least one vehicle lock according to the first communication signal when a distance corresponding to the second communication signal is not greater than a default distance.