Wireless EV Parking Alignment Using DD Coil Voltage Peaks
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Solution Overview
Problem
Conventional parking aid systems for electric vehicles with DD-type power supply coils lack a method to accurately align the power receiving unit for efficient non-contact battery charging, as the optimal alignment position is not well-defined.
Innovation Solution
A parking aid system that includes a power supply unit with a DD-type coil, a voltage measuring unit, a coil type specifying unit, and an alignment aid unit, which calculates the target position of the power receiving unit based on measured voltage peaks, allowing for efficient charging by aligning the power receiving unit at the appropriate position, even when using a DD-type coil as the power supply coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a DD-type coil is used as the power supply coil, then power can be supplied efficiently at displaced positions, but the optimal alignment position is not well-defined and alignment becomes difficult
Solution Approach 1:
The system measures the voltage of the power receiving coil during alignment and provides feedback to the alignment aid unit. The alignment aid unit calculates the target position based on the measured voltage and displays it to the driver, enabling precise alignment with DD-type coils by using real-time voltage feedback.
Solution Approach 2:
The patent replaces mechanical alignment methods with electromagnetic field-based voltage measurement and calculation. Instead of relying on physical markers or visual alignment, the system uses voltage measurement of the power receiving coil and computational determination of the target position to achieve precise alignment.
2Loss of energy
If the power receiving coil is aligned at the center position with a cyclic coil, then power supply efficiency is maximized, but alignment precision requirements are high
Solution Approach 1:
The system continuously monitors the voltage of the power receiving coil during the alignment process and uses this feedback to calculate and display the target position. This allows the driver to achieve precise center alignment with cyclic coils by following the system's guidance based on real-time voltage measurements.
3Device complexity
If no alignment aid is provided for DD-type coils, then the system is simpler, but charging efficiency decreases due to improper alignment
Solution Approach 1:
The alignment aid unit serves multiple functions: it identifies the coil type (cyclic or DD-type), measures the power receiving coil voltage, calculates the appropriate target position based on the identified coil type, and displays the alignment guidance. This multi-functional approach adds minimal complexity while solving alignment problems for both coil types.
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 efficient battery charging by accurately determining the target position for the power receiving unit, allowing the driver to align it correctly, thereby improving charging efficiency and usability, especially when the power supply coil is of the DD-type.
Implementation Method 1
a power supply unit by a power supply coil is provided in the road surface. In addition, a power receiving unit by a power receiving coil is provided at the bottom of the vehicle, and receives electrical power for battery charging sent from the power supply unit
Implementation Method 2
a voltage measuring unit which measures voltage of the power receiving coil
Data Source
AI summary
A parking aid system aids in alignment parking of a vehicle to a parking space. The vehicle includes: a power receiving unit which receives the electrical power for alignment by way of a power receiving coil; a voltage measuring unit which measures voltage of the power receiving coil; a coil type specifying unit which specifies a type of the power supply coil during the alignment parking; and an alignment aid unit which calculates a target position of the power receiving unit, based on a voltage measured value. The alignment aid unit, in a case of the type of the power supply coil being a DD-type coil, calculates the position of a first peak P1 in the voltage measured value when changing the relative position between the power supply unit and the power receiving unit, and then calculates the target position based on the position of the first peak P1.