UWB Ranging Control Device for Vehicle Smart Key Scenarios
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Solution Overview
Problem
Existing UWB ranging systems in vehicles are inefficient as they rely solely on exterior UWB modules for smart key RSD, neglecting the importance of interior modules, which can be more necessary in certain situations.
Innovation Solution
A UWB ranging control device and method that subdivides smart key RSD cases and efficiently combines UWB anchors for ranging, allowing for prioritized operation based on specific scenarios such as driver seat PKE, passenger seat PKE, passive trunk, and passive start.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only exterior UWB modules are used for smart key RSD, then the system structure is simple, but ranging accuracy and reliability are insufficient in certain situations
Solution Approach 1:
The patent segments the UWB ranging system into multiple independent modules positioned at different locations (exterior bumpers and interior roof). Each module can independently perform ranging operations, allowing the system to select the most appropriate module based on the specific scenario, thereby improving ranging accuracy without requiring all modules to operate simultaneously.
Solution Approach 2:
The patent implements a universal UWB ranging system where both exterior and interior modules serve multiple functions. The same ranging algorithm and control logic are applied to different module configurations, allowing the system to adapt to various scenarios (driver seat PKE, passenger seat PKE, passive trunk, passive start) using a unified multi-functional architecture.
2Reliability
If multiple UWB modules are activated simultaneously for all scenarios, then ranging reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements a dynamic module activation strategy where the system selectively activates only the necessary UWB modules based on the current operation scenario. For example, during driver seat PKE, the system activates specific exterior and interior modules appropriate for that scenario, rather than keeping all modules continuously active, thereby maintaining reliability while reducing power consumption.
Solution Approach 2:
The patent applies local quality by assigning different activation priorities and operational roles to different UWB modules based on their positions and scenario requirements. Exterior modules on bumpers and interior modules on the roof have different activation conditions, allowing the system to optimize power usage by activating only the locally appropriate modules for each specific ranging scenario.
3Measurement precision
If a unified ranging approach is used for all scenarios, then device complexity is reduced, but ranging performance is suboptimal for specific scenarios
Solution Approach 1:
The patent segments the ranging control logic into scenario-specific configurations. Different operation scenarios (driver seat PKE, passenger seat PKE, passive trunk, passive start) have dedicated module combinations and ranging parameters, allowing each scenario to utilize the optimal module configuration without requiring complex real-time adaptive algorithms.
Solution Approach 2:
The patent implements parameter changes by adjusting ranging parameters such as signal thresholds, timing windows, and module selection criteria based on the specific operation scenario. This allows the system to optimize ranging performance for each scenario by changing operational parameters rather than requiring fundamentally different ranging approaches.
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
This approach maximizes operation performance by ensuring that the most appropriate UWB anchors are used for each scenario, enhancing ranging accuracy and efficiency while minimizing power consumption.
Implementation Method 1
Ultra-wide band (UWB) is a technique for calculating a distance between communication subjects using a Time-of-Flight (ToF) technique by multiplying a time required for a signal to reach between the communication subjects by the speed of light
Data Source
AI summary
Disclosed is an ultra-wideband (UWB) system and, more particularly, a UWB system capable of optimizing UWB operation for vehicles through hopping. The UWB system includes a memory in which a UWB communication program is embedded and a processor which executes the program. The processor performs UWB time-hopping and frequency-hopping to establish a communication channel.