Smart Key Antenna System Using Motion Sensor for Proximity Detection
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Solution Overview
Problem
Existing smart key systems for owner-driven cars rely on multiple low-frequency antennae, which are costly and inefficient in terms of space usage, as they can only sense the smart key within a limited range and require multiple antennae for functionality.
Innovation Solution
An antenna system utilizing a motion sensor, such as an acceleration sensor, gyro sensor, or geomagnetic sensor, integrated with a first-axis or second-axis antenna to replicate the functionality of multiple antennae, allowing for real-time signal strength measurement and axis information generation to determine user proximity to a vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple low-frequency antennae are used for smart key sensing, then the sensing functionality is achieved, but the manufacturing cost increases and space is wasted
Solution Approach 1:
The patent uses a motion sensor to copy the functionality of multiple antennae. The motion sensor detects movements and orientations that correspond to the presence and position of a smart key, replicating the sensing capability without requiring actual multiple antennae structures.
Solution Approach 2:
The patent replaces expensive antennae with a cheaper motion sensor. The motion sensor is a more cost-effective component that can perform the same smart key detection function, reducing manufacturing costs while maintaining reliability.
2Reliability
If multiple low-frequency antennae are installed for smart key communication, then the authentication capability is provided, but the device complexity increases
Solution Approach 1:
The motion sensor serves multiple functions: it detects the presence of a smart key, determines its position, and authenticates it. This single component replaces what would traditionally require multiple specialized antennae, reducing device complexity while maintaining authentication capability.
Solution Approach 2:
The patent combines the functions of multiple antennae into a single motion sensor. By merging these separate components into one integrated sensor, the system achieves the same authentication capability with reduced complexity and fewer parts.
3Reliability
If multiple antennae are used to sense smart key within limited range, then the communication range is covered, but the space usage becomes inefficient
Solution Approach 1:
The motion sensor copies the spatial detection capability of multiple antennae by detecting movement patterns and orientations. It reconstructs the positional information that would otherwise require multiple physically distributed antennae, maintaining communication coverage while using less space.
Solution Approach 2:
The patent transitions from a two-dimensional antenna array layout to a three-dimensional motion detection approach. The motion sensor detects movements in multiple dimensions (x, y, z axes) to determine smart key position, achieving the same spatial coverage without requiring multiple antennae spread across the vehicle surface.
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 solution reduces manufacturing costs and space usage by replacing multiple antennae with a cheaper motion sensor, enabling the same functionality as a multi-axis antenna system while maintaining effective communication within the limited range.
Implementation Method 1
The motion sensor may include an acceleration sensor, a gyro sensor or a geomagnetic sensor.
Implementation Method 2
The motion sensor may include an acceleration sensor, a gyro sensor or a geomagnetic sensor.
Implementation Method 3
The motion sensor may include an acceleration sensor, a gyro sensor or a geomagnetic sensor.
Data Source
AI summary
An antenna system using a motion sensor includes an antenna having a plurality of axes within a smart device, whereby motion sensor sensing axis information is generated by movement or rotation of the plurality of axes of the antenna, and a controller for controlling the information sensed by the motion sensor and a strength of a signal of the antenna having the plurality of axes received in real time.