EV Wireless Power Pairing via Unique Identifier Segmentation
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Solution Overview
Problem
In a charging station with multiple coexisting chargers, electric vehicles face challenges in communicating and pairing with the intended charger for wireless power transmission, leading to inefficient charging due to unreliable WLAN association and lack of precise positioning and pairing methods.
Innovation Solution
A communication association, positioning, and pairing method using a Pairing and Positioning Device (PPD) on both the electric vehicle and electric vehicle supply equipment (EVSE), which involves broadcasting identifiable information, performing wireless communication association, and determining successful pairing through consistent identifiers and positioning protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple chargers coexist in a charging station, then charging capacity and service coverage are improved, but communication association reliability deteriorates due to difficulty in identifying the intended target charger
Solution Approach 1:
The patent segments the identification process by introducing a unique identifier (UI) specifically for the pairing and positioning device that is distinct from the EVSE identifier. This segmentation allows the EV to accurately identify the intended charger among multiple chargers by matching the PPD's UI with the broadcast information, thereby resolving the communication association reliability issue while maintaining multi-charger capability.
2Device complexity
If wireless communication association is performed without precise positioning, then communication process is simplified, but positioning accuracy deteriorates leading to failed pairing
Solution Approach 1:
The patent implements preliminary positioning action by having the pairing and positioning device perform ranging measurements and determine relative position before final pairing is established. The EVSE broadcasts positioning information including distance and angle, allowing the EV to verify it is positioned correctly over the charging spot before initiating power transfer, thus ensuring positioning accuracy without significantly complicating the overall process.
3Measurement precision
If manual pairing intervention is required, then pairing accuracy is improved, but charging time and user convenience deteriorate
Solution Approach 1:
The patent implements self-service pairing through automatic identification and verification mechanisms. The EV receives broadcast information from the PPD including unique identifiers and positioning data, automatically matches this information with its own sensors and databases, and completes pairing without user intervention. This self-service approach maintains pairing accuracy while eliminating manual steps that would increase charging time.
4Device complexity
If WLAN association is performed without additional positioning protocols, then system complexity is reduced, but communication congestion and association failures increase in multi-charger environments
Solution Approach 1:
The patent introduces the pairing and positioning device as an intermediary between the EV and the EVSE. The PPD broadcasts additional identification information and positioning data that supplement the standard WLAN association process. This intermediary provides the extra information needed for reliable identification in multi-charger environments without requiring complete redesign of the WLAN association protocol, thus balancing complexity and reliability.
Data Source
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AI summary
A method and apparatus for an EV that receives power from an EVSE, includes receiving, by the EV, identifiable information broadcast from a plurality of EVSEs associated with at least one SECC; selecting, by the EV, one of the plurality of EVSEs as a first EVSE; performing, by the EV, wireless communication association with the first EVSE; performing, by at least one of the EV and the first EVSE, positioning until the EV is at a location capable of being charged from the first EVSE; and performing, by at least one of the EV and the first EVSE, pairing with the first EVSE so that the EV receives power from the first EVSE.