3-Axis Antenna Vehicle Key Position Detection
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Solution Overview
Problem
Existing vehicle key control systems face challenges in accurately detecting the position of a vehicle key using a minimal number of antennas, which affects reliability and increases manufacturing costs.
Innovation Solution
A vehicle key control apparatus that uses a communicator to receive response signals with x-axis, y-axis, and z-axis reception strengths and a controller to determine the key's position by comparing these strengths with stored reference values, allowing for precise positioning with fewer antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of antennas is increased to improve detection reliability, then the reliability of detecting the vehicle key position is improved, but the manufacturing cost increases
Solution Approach 1:
The patent introduces a 3-axis antenna that measures reception strength in three dimensional directions (x-axis, y-axis, z-axis) instead of using multiple antennas. This dimensional approach allows the system to obtain spatial information about the vehicle key position through signal strength variations along different axes, achieving reliable position detection with fewer physical antennas.
Solution Approach 2:
The patent changes the measurement parameter from simple signal presence/absence to multi-dimensional reception strength values. By measuring and comparing signal strengths along three orthogonal axes, the system can determine the relative position of the vehicle key with respect to the antenna, enabling accurate detection without increasing the number of antennas.
2Ease of manufacture
If the number of antennas is reduced to decrease manufacturing cost, then the manufacturing cost decreases, but the reliability of detecting the vehicle key position deteriorates
Solution Approach 1:
The patent compensates for the reduced number of antennas by introducing multi-dimensional measurement capabilities. The 3-axis antenna provides reception strength information along three orthogonal directions, creating a dimensional framework that enables reliable position detection despite using fewer physical antenna elements.
Solution Approach 2:
The patent replaces the mechanical approach of using multiple physical antennas with an information-based approach using multi-axis signal strength measurement. Instead of relying on the physical presence of multiple antennas to determine position, the system uses the directional reception strength data from a single 3-axis antenna to infer spatial relationships.
3Measurement precision
If multiple antennas are used to improve position detection accuracy, then the measurement precision of vehicle key position is improved, but the device complexity increases
Solution Approach 1:
The patent achieves position detection accuracy by measuring signal characteristics in three orthogonal directions rather than using multiple antennas. The 3-axis antenna provides x-axis, y-axis, and z-axis reception strength values that together encode spatial position information, maintaining measurement precision while reducing hardware complexity.
Solution Approach 2:
The single 3-axis antenna performs multiple functions: it detects the presence of the vehicle key, determines its relative position in three-dimensional space, and provides directional information. This multi-functional capability replaces what would traditionally require multiple specialized antenna elements, thereby reducing system complexity while maintaining or improving measurement precision.
Data Source
AI summary
A vehicle key control apparatus includes a communicator receiving a response signal from a vehicle key receiving a search signal transmitted from a vehicle, wherein the response signal comprises an x-axis reception strength, a y-axis reception strength, and a z-axis reception strength; and a controller determining a position of the vehicle key on the basis of at least one among the x-axis reception strength, the y-axis reception strength, and the z-axis reception strength.