Passive Vehicle Start Identifier Detection Using Stable RSSI Proximity
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Solution Overview
Problem
Existing methods for detecting a vehicle identification number (VIN) for passive starting are prone to user-intentional or unintentional calibration distortions, which can result in non-compliance with Thatcham criteria for permissible starting distances.
Innovation Solution
A method involving power measurements and stability checks using a primary and secondary transmitter/receiver system, with automatic calibration initiated when the identifier is in contact or proximity to a reception surface, ensuring stable conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual calibration is initiated by the user before first use of passive functions, then the identifier can be paired with the vehicle, but the user can intentionally or unintentionally distort calibration results causing non-compliance with Thatcham criteria
Solution Approach 1:
The system performs automatic calibration without user intervention. The vehicle autonomously detects the identifier, measures signal characteristics, and completes calibration in the background, eliminating user-induced errors while maintaining calibration functionality
Solution Approach 2:
The system performs calibration automatically during the first pairing process before the user can interfere. By pre-establishing the calibration routine as an automated sequence, the system ensures accurate baseline measurements are captured before any potential user distortion can occur
2Adaptability or versatility
If the vehicle uses Bluetooth Low Energy identifiers for passive starting, then communication between vehicle and identifier is enabled, but calibration is required before each first use which can be distorted by users
Solution Approach 1:
The calibration process is extracted from user-controlled operations and placed entirely within the vehicle's automated system. The complex calibration measurements and computations are performed exclusively by the vehicle's processor, removing the problematic human element while preserving BLE identifier versatility
Solution Approach 2:
The vehicle's processor acts as an intermediary that mediates the calibration process between the identifier and the passive starting function. It autonomously manages the entire calibration sequence, signal measurements, and threshold establishment, simplifying the user experience while ensuring compliance
3Measurement precision
If the identifier is placed on a designated surface inside the passenger compartment, then the vehicle can detect the identifier is inside, but the system cannot distinguish between intentional placement and accidental proximity
Solution Approach 1:
The system uses excessive measurement actions by taking multiple RSSI measurements over an extended time period (at least 5 seconds) rather than a single quick measurement. This partial repetition of measurements allows the system to distinguish between stable placement and transient proximity through statistical analysis of measurement consistency
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
Ensures accurate and reliable passive starting by automating calibration, preventing user interference and ensuring compliance with Thatcham regulations, enhancing user experience and reliability.
Implementation Method 1
a plurality of power measurements in reception of received signals, received signals corresponding to signals emitted by a primary transmitter/receiver of an identifier
Data Source
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AI summary
The invention concerns a method for detecting (P) an identifier (1) for the passive starting of a vehicle (2), the identifier (1) comprising a primary transmitter/receiver (13) and the vehicle (2) comprising a secondary transmitter/receiver (23) and a receiving surface (24) configured to receive the identifier (1), according to which the detection method (P) comprises: - taking (E1) a plurality of measurements of the reception power (RSSI) at which received signals (S1') are received, - comparing (E2) the reception power (RSSI) measurements with a threshold power (p1), - detecting (E4) that the identifier (1) is in contact with or in the immediate vicinity of the receiving surface (24) if the reception power (RSSI) measurements are greater than or equal to the threshold power (p1) and if a stability condition (C1) is verified.