Vehicle Digital Key Wake-Up Architecture for Accurate Fob Positioning
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Solution Overview
Problem
Existing vehicle digital key systems face challenges in reducing power consumption and minimizing inaccuracy in positioning the key fob, particularly due to the need for multiple communication modules and the distortion of radio signals by metal vehicle bodies.
Innovation Solution
A vehicle digital key system that includes a first communication module to broadcast signals and calculate distance to the key fob, switching a second communication module from sleep mode to wake-up mode when the calculated distance is within a preset threshold, and using multiple third communication modules to accurately determine the key fob's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple communication modules and sensors are operated in real time to ensure security and accurate distance measurement, then the accuracy of distance measurement and security are improved, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic operation of communication modules by switching between sleep mode and active mode based on detected conditions. The first communication module continuously monitors distance, and when the key fob approaches within a first threshold distance, the second communication module is activated. This dynamic switching allows the system to maintain measurement accuracy when needed while reducing power consumption during normal operation.
Solution Approach 2:
The system performs preliminary distance detection using the first communication module before activating the more power-intensive second communication module. By pre-screening with a lower-power module and only activating additional modules when the key fob is in proximity, the system prepares for accurate positioning only when necessary, thus balancing power consumption with measurement precision.
2Ease of operation
If radio signals are used for remote control communication between vehicle and key fob, then wireless communication convenience is improved, but signal distortion occurs due to metal vehicle body
Solution Approach 1:
The patent segments the communication system into multiple communication modules with different functions. The first communication module handles initial distance detection, while the second communication module handles precise positioning when activated. This segmentation allows the system to use radio signals for convenient wireless communication while mitigating distortion issues by using multiple modules with different characteristics and activation conditions.
Solution Approach 2:
The first communication module acts as an intermediary that detects when the key fob approaches the vehicle and triggers the activation of the second communication module. This intermediary function allows the system to transition from convenient but potentially distorted radio signal communication to more accurate positioning mode when needed, compensating for metal body interference.
3Measurement precision
If the second communication module is activated to calculate key fob position using multiple third communication modules, then positioning accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic activation of the second communication module and third communication modules based on distance thresholds. The system transitions from a simple single-module configuration to a complex multi-module configuration only when the key fob is within the first threshold distance, allowing accurate positioning while maintaining simplicity during normal operation.
Solution Approach 2:
The system performs preliminary distance detection using the first communication module before activating the more complex positioning system. By pre-screening with the simpler first module and only activating the second module with multiple third communication modules when the key fob is in proximity, the system prepares for accurate positioning only when necessary, thus balancing positioning accuracy with device complexity.
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
The system effectively reduces power consumption while maintaining accurate key fob positioning, even in the presence of metal vehicle bodies that can distort radio signals.
Implementation Method 1
calculate a distance to a key fob based on a second signal corresponding to the first signal when the first communication module receives the second signal from the key fob
Implementation Method 2
The first communication module may communicate with the key fob using a frequency of 2.4 [GHz] band, and the second communication module and the third communication modules may communicate with the key fob using a baseband frequency
Data Source
AI summary
A vehicle digital key system according to an embodiment of the present invention comprises: a first communication module for broadcasting a first signal at a predetermined time interval, calculating, when a second signal corresponding to the first signal is received from a key fob, a distance to the key fob on the basis of the second signal, and switching, when the calculated distance is within a preconfigured first threshold, a second communication module from a sleep mode to a wakeup mode; a second communication module for switching a plurality of third communication modules from a sleep mode to a wakeup mode, and calculating a position of the key fob by using at least three third communication modules among the plurality of third communication modules; and a control unit for unlocking the door lock of a vehicle on the basis of the position of the key fob.