Vehicle Proximity Control With Interference-Resistant Wireless Detection
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Solution Overview
Problem
Existing methods for determining the distance between a mobile device and a transportation means, such as a vehicle, are prone to errors due to signal interference, leading to security risks and inaccurate activation of vehicle functions.
Innovation Solution
Implementing multiple short-distance wireless communication modules on the vehicle, with periodic message exchanges and power adjustments to ensure accurate distance measurement and interference resistance, enabling secure and precise activation of vehicle functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single short-distance wireless communication module is used to determine distance based on RSSI, then the device complexity is low, but the measurement precision deteriorates due to signal interference
Solution Approach 1:
The patent divides the single communication module into multiple communication modules (first communication module and second communication module) positioned at different locations on the vehicle. Each module independently measures distance to the mobile device, and the system uses multiple measurement results to determine whether the device is within the security distance, thereby improving measurement accuracy through spatial segmentation.
Solution Approach 2:
The patent combines the distance measurement results from multiple communication modules to make a unified determination about whether the mobile device is within the security distance. By merging multiple independent measurements and requiring consistent results (both modules indicate within distance), the system achieves more reliable and accurate distance assessment compared to using a single module.
2Measurement precision
If the transmit power is continuously adjusted to maintain signal strength, then the measurement precision improves, but the use of energy increases
Solution Approach 1:
The patent implements periodic distance measurement by having communication modules send messages at specific intervals (first periodicity for broadcasting, second periodicity for listening). This periodic operation allows the system to maintain accurate distance monitoring without continuous high-power transmission, as modules only activate at predetermined intervals rather than continuously.
Solution Approach 2:
The patent dynamically adjusts the transmit power of communication modules based on whether the mobile device is detected within the security distance. When a device is detected, the system increases transmit power to maintain communication quality; when no device is present, it reduces power consumption. This dynamic adjustment optimizes the balance between measurement precision and energy consumption.
Data Source
AI summary
An electronic device is located in a transportation means and includes an ECU, a first and a second short-distance wireless communication module, wherein between which a distance is a first distance. When no interference, the second short-distance wireless communication module receives a first message broadcast by the first short-distance wireless communication module. When interference, the second short-distance wireless communication module does not receive the first message, and sends a notification message to the ECU; and the ECU indicates the first short-distance wireless communication module to increase a transmit power until the second short-distance wireless communication module receives the first message. Therefore, the first message can be received only when a distance between a mobile device and the transportation means is less than or equal to the first distance, so as to send a first response message, so that the electronic device controls the transportation means to perform a specific function.