Vehicle Positioning via Low-Frequency Antenna Triangulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio-based vehicle safety systems fail to efficiently determine the spatial position of a vehicle-external inductive charging unit relative to the vehicle, leading to suboptimal power transfer efficiency during wireless charging.
Innovation Solution
The system employs low-frequency transmitting antennas and a receiver to perform electromagnetic distance and angle measuring, allowing the access control device to triangulate the position of the charging unit, enabling precise localization and guiding the vehicle into an optimal charging position for minimal power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic distance and angle measuring is used to determine the position of the charging unit, then positioning accuracy is improved, but device complexity increases due to additional transmitting antennas and receivers
Solution Approach 1:
The existing low-frequency transmitting antennas of the radio-based locking system are made multi-functional by using them not only for access control communication but also for electromagnetic distance and angle measuring to determine the position of the charging unit. This allows the system to perform multiple functions with existing components, improving positioning accuracy without proportionally increasing device complexity
Solution Approach 2:
The system uses its own existing infrastructure (transmitting antennas and access control device) to perform the positioning function, rather than requiring a completely separate positioning system. The transmitting antennas serve themselves dual purposes: communication with access elements and positioning of the charging unit through electromagnetic measuring
2Loss of energy
If the secondary coil is positioned in the preferred position area relative to the primary coil, then power transfer efficiency is improved, but the difficulty of achieving and maintaining this position increases
Solution Approach 1:
The system continuously determines the position of the charging unit using electromagnetic distance and angle measuring, providing feedback information about the relative position between the primary and secondary coils. This feedback enables the system to detect whether the coils are in the preferred position area and to guide adjustments to achieve optimal power transfer efficiency
Solution Approach 2:
The patent replaces manual positioning or mechanical alignment methods with an electronic positioning system based on electromagnetic distance and angle measuring. This substitution makes position detection more precise and easier to implement, allowing the system to automatically determine coil positions and guide the vehicle into the optimal charging position
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 method allows for accurate positioning of the secondary coil relative to the primary coil, maximizing power transfer efficiency during inductive charging and facilitating automatic driving maneuvers to achieve the charging position.
Implementation Method 1
the spatial position of the access element relative to the vehicle being detectable by means of the principle of electromagnetic distance and angle measuring between the transmitting antennas and the receiver
Implementation Method 2
the power transfer takes place by way of an electromagnetic exciter field of a vehicle-external primary coil to a vehicle-side secondary coil by way of electromagnetic induction at the secondary coil
Data Source
AI summary
An access control device of a vehicle is configured to detect the spatial position of the access element of the vehicle safety unit relative to the vehicle via electromagnetically detecting the distances and angles between several low-frequency transmitting antennas of the vehicle safety unit and the low-frequency receiver of the access element. The access control device is also configured to detect the location position of an external induction charging unit relative to the vehicle via electromagnetically measuring the distance and angle between at least two transmitting antennas of several low-frequency transmitting antennas and at least one receiving antenna of the induction charging unit.