EV Wireless Charging Coil Positioning via Magnetic Flux Sensing
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Solution Overview
Problem
Existing wireless power transmission systems for electric vehicles face challenges in accurately positioning vehicles due to changes in magnetic flux alignment as they travel over transmitting coils, affecting efficiency and alignment during charging.
Innovation Solution
A system utilizing multiple coils on the vehicle, connected to rectifiers and digital voltmeters, processes magnetic flux data to calculate precise positioning relative to power transmitting coils below the road, enabling two-dimensional positioning support and dynamic charging guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wireless power transmission systems use transmitting coils embedded in the road, then power can be transmitted wirelessly to electric vehicles, but the alignment between receiver coils and transmitter coils changes as the vehicle moves, affecting positioning accuracy and power transfer efficiency
Solution Approach 1:
The receiver coils serve dual functions: transferring power from the transmitter coils and sensing magnetic flux for positioning. By making the power receiving components also function as position sensors, the system simultaneously achieves wireless power transfer and accurate positioning without requiring separate sensor systems.
Solution Approach 2:
The system continuously monitors magnetic flux through the receiver coils and uses this feedback to determine vehicle position and alignment. This real-time feedback enables dynamic adjustment and optimization of power transfer efficiency based on the actual positioning of the vehicle relative to the transmitter coils.
2Measurement precision
If multiple coils are used for sensing magnetic flux, then positioning precision is improved, but the complexity of the receiver system increases
Solution Approach 1:
The same receiver coils that capture power are also used for magnetic flux sensing and positioning. This multi-functional approach enables precise positioning through multiple coils without adding separate sensing hardware, thereby avoiding increased system complexity.
Solution Approach 2:
The power reception function and position sensing function are merged into a single integrated system using the same coil structure. By combining these functions, the system achieves high positioning precision while minimizing the number of components and overall system 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
Enables accurate, efficient, and precise positioning of electric vehicles for both static and dynamic charging, enhancing power transfer efficiency and alignment.
Implementation Method 1
a magnetic field formed by power transmitters in road section 101 induces a voltage in each power receiver
Implementation Method 2
sensing the magnetic flux for positioning the electric vehicles
Data Source
AI summary
A system for positioning wirelessly powered or charged electric vehicles is provided herein. The system includes: a plurality of partially overlapping coils forming a power receiver segment attached to the electric vehicle; a set of two or more coils located symmetrically on the power receiver segment and connected to respective rectifiers and digital voltmeters; a set of three or more coils located along a longitudinal centre of the power receiver segment and connected to connected to respective rectifiers and digital voltmeters; a computer processor configured to receive samples from the digital voltmeters and calculate, based on calibration data, a position of the electric vehicle relative to the powers transmitting coils located below the road, wherein the calibration data map voltage values representative of magnetic flux though the set of three coils and the set of fur coils, into longitudinal and lateral displacement of the receiver segment, respectively.