Inductive Charging Pose Determination Using Radio Direction Finding
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Solution Overview
Problem
Existing systems for determining the relative pose between primary and secondary winding structures in inductive power transfer systems face inaccuracies due to environmental influences, such as metal objects and ferromagnetic materials, which affect the accuracy of power transfer positioning.
Innovation Solution
A method using a radio direction finding system with transmitting and receiving devices, combined with motion value determination, employs model-based pose determination and Kalman filter algorithms to fuse output signals and motion values for accurate relative pose calculation, reducing noise and interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal transmission evaluation is used for pose determination, then power transfer positioning can be achieved, but measurement precision deteriorates due to environmental influences such as metal objects and ferromagnetic materials
Solution Approach 1:
The patent introduces radio direction finding systems as intermediary devices that transmit position signals between the vehicle and charging unit. These radio signals serve as mediators that are not affected by the electromagnetic interference that plagues the power transfer signals, allowing accurate pose determination independent of environmental factors like metal objects and ferromagnetic materials.
Solution Approach 2:
The patent separates the pose determination function from the power transfer function by using distinct systems: radio direction finding systems for positioning and inductive coupling for power transfer. This segmentation allows each system to optimize for its specific purpose without interference from the other, improving overall measurement precision.
2Reliability
If multiple receiving devices are used for radio direction finding, then pose determination reliability improves, but device complexity increases
Solution Approach 1:
The patent combines multiple receiving devices into an integrated radio direction finding system that processes signals from multiple sources to determine position. By merging the functionality of multiple receivers into a coordinated system with centralized signal processing, the patent achieves improved reliability through redundancy while managing complexity through systematic integration.
Solution Approach 2:
The system uses feedback mechanisms where the evaluation unit processes output signals from multiple receiving devices and adjusts pose determination based on the combined information. This feedback loop allows the system to reliably determine position by comparing and synthesizing data from multiple receivers, improving accuracy without proportionally increasing operational 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
This approach provides a reliable and accurate determination of the relative pose, enhancing the precision of inductive power transfer by minimizing inaccuracies caused by environmental factors and improving the certainty of pose determination.
Implementation Method 1
a primary unit (4) with a primary winding structure (2) for generating an alternating electromagnetic field if the primary winding structure is energized or supplied with operating current
Implementation Method 2
a secondary unit (6) with a secondary winding structure (3) for receiving an alternating electromagnetic field generated by the primary winding structure
Implementation Method 3
at least one radio direction finding system for determining a relative pose between a primary winding structure and a secondary winding structure
Data Source
AI summary
A method is disclosed for determining a relative pose between a primary winding structure and a secondary winding structure of a system for inductive power transfer to a vehicle. The method includes obtaining first output values generated by multiple receiving devices of a first radio direction finding system. The first radio direction finding system further includes a transmitting device. The receiving devices generate the output values in response to receiving a position signal transmitted by the transmitting device. The method includes determining a motion value of the vehicle. The method includes providing the obtained first output values and the motion value as input values to a model. The method includes determining a first relative pose based on the model. The method includes determining the relative pose based on the first relative pose.