Vehicle Unlocking Control Using Device-Specific RSSI Distance Mapping
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Solution Overview
Problem
Existing vehicle unlocking systems using mobile terminals face detection errors due to varying performances in antenna and transmission power, leading to inaccurate sensor-less control and user inconvenience.
Innovation Solution
A vehicle control method that obtains a target mapping relationship between RSSI values and distances specific to a mobile terminal model, correcting this relationship using reference RSSI values and known distances at predefined positions, and adjusts the mapping based on vehicle unlocking timing to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a general mapping relationship between RSSI value and distance is used for vehicle unlocking, then the unlocking function can be achieved, but detection accuracy deteriorates due to variations in mobile terminal antenna performance and transmission power
Solution Approach 1:
The patent changes the mapping relationship parameters by creating device-specific mapping relationships tailored to each mobile terminal model. Instead of using a universal mapping relationship, the system establishes customized mappings that account for variations in antenna performance and transmission power across different device models, thereby improving distance detection accuracy while maintaining ease of operation
Solution Approach 2:
The patent implements a feedback mechanism where the system collects actual distance data and RSSI values from multiple reference positions for each mobile terminal model. This feedback is used to continuously optimize and correct the mapping relationship, ensuring high accuracy distance detection while preserving the simplicity of the unlocking function
2Measurement precision
If device-specific mapping relationships are established for each mobile terminal model, then distance detection accuracy is improved, but system complexity increases due to multiple mapping relationships needing storage and management
Solution Approach 1:
The patent achieves universality by creating a standardized framework for managing device-specific mapping relationships. The system uses a unified data structure and management protocol that can handle multiple mobile terminal models, allowing the same system architecture to serve various device types without requiring separate management mechanisms for each model
Solution Approach 2:
The patent employs copying by creating standardized templates for mapping relationships that can be replicated across different mobile terminal models. Once a mapping relationship is established for a particular device model, it can be copied and applied to other devices of the same model, reducing the overall complexity of managing numerous unique mappings
3Measurement precision
If reference RSSI values are collected at multiple reference positions to correct mapping relationships, then mapping accuracy is improved, but time consumption increases during the calibration process
Solution Approach 1:
The patent applies preliminary action by pre-establishing reference positions and their corresponding known distances before actual distance detection begins. The system prepares the mapping relationship framework in advance using collected reference data, so that during normal operation, distance detection can proceed quickly without requiring real-time calibration at multiple positions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the accuracy of sensor-less vehicle unlocking, enhancing user experience by ensuring precise distance determination and reducing errors in vehicle control operations.
Implementation Method 1
obtaining a target mapping relationship matching a device model of the mobile terminal, where the target mapping relationship includes a mapping relationship between a RSSI value and a distance between the mobile terminal and a vehicle; based on the target mapping relationship, determining a target distance corresponding to the target RSSI value
Data Source
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AI summary
A vehicle control method includes: in response to obtaining a target received signal strength indication (RSSI) value of ranging broadcast information sent by a mobile terminal, obtaining a target mapping relationship matching a device model of the mobile terminal, where the target mapping relationship includes a mapping relationship between a RSSI value and a distance between the mobile terminal and a vehicle; based on the target mapping relationship, determining a target distance corresponding to the target RSSI value; and in response to determining that the target distance is less than or equal to a preset distance threshold, controlling the vehicle associated with the on-board terminal to unlock a door lock.