RFID Tag Placement for Wireless EV Charging Alignment
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Solution Overview
Problem
The existing contactless wireless power transmission systems for vehicles face challenges in establishing efficient pairing between the power transmission device and the vehicle, leading to inconvenient re-parking due to limited RFID communication range, which hinders early-stage identification and alignment during parking.
Innovation Solution
The system employs multiple RFID tags strategically placed on the vehicle, including at the front end, trailing end, and near the power receiving unit, along with a narrower communication range RFID reader, to facilitate early-stage pairing by reducing the distance between tags and improving reading range, allowing for accurate vehicle positioning and alignment during parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single RFID tag is used in the vehicle, then the device complexity is reduced, but the pairing establishment timing is delayed until after parking completion
Solution Approach 1:
The vehicle is segmented into multiple RFID tags positioned at different locations (front end, rear end, and near power receiving unit) to enable earlier and more reliable pairing establishment during the parking process
Solution Approach 2:
RFID tags are preliminarily positioned at strategic locations on the vehicle body, particularly at the front end and near the power receiving unit, to enable pairing establishment to occur during the parking maneuver rather than after completion
2Measurement precision
If the RFID reader has a narrow communication range, then the measurement precision of vehicle positioning is improved, but the pairing establishment may be missed during parking
Solution Approach 1:
Multiple RFID tags are distributed at different locations on the vehicle (front end, rear end, near power receiving unit) to increase the probability that at least one tag enters the narrow communication range of the RFID reader during parking
Solution Approach 2:
The problem is solved by adding spatial distribution of multiple tags along the vehicle's length, transforming a single-point detection problem into a multi-point detection system that covers the parking trajectory
3Ease of operation
If pairing is established after parking completion, then the communication range requirements are reduced, but re-parking operations are required when positioning is incorrect
Solution Approach 1:
Pairing establishment is performed preliminarily during the parking maneuver itself by positioning RFID tags at the front end and rear end of the vehicle, enabling real-time feedback on positioning accuracy before parking completion
Solution Approach 2:
The system provides feedback during parking by establishing pairing based on RFID tag detection, allowing the driver to determine if positioning is correct before completing the parking operation, thereby avoiding re-parking
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 configuration enables reliable and early establishment of pairing between the power transmission device and the vehicle, enhancing parking alignment and efficiency by ensuring accurate identification and positioning, thus reducing the need for re-parking operations.
Implementation Method 1
an RFID (Radio Frequency IDentification) is a technique of performing an object recognition with use of an RFID tag, which stores ID information, and an RFID reader, which reads the information from the RFID tag through a wireless communication with the RFID tag
Implementation Method 2
a contactless wireless power transmission without a power cord or a power transmission cable
Data Source
AI summary
A vehicle includes a power receiving unit and an RFID tag. The power receiving unit contactlessly receives electric power output from a power transmission unit. The RFID tag preliminarily stores information which is identification information for identifying the vehicle in the power transmission device and can be contactlessly read by the power transmission device. Here, the RFID tag is arranged at a vehicle body front end (a vehicle body trailing end) in a vehicle traveling direction when the vehicle is guided into a parking frame.