Dual Wireless Handoff for High-Speed Noncontact Vehicle Charging

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Solution Overview

Problem

Existing noncontact power supplying systems face delays in communication at high vehicle speeds, leading to inadequate control of power supply from ground power supplying apparatuses.

Innovation Solution

Implementing a vehicle with both wide area and short range wireless communication devices, allowing vehicle information to be transmitted via wide area communication at a distance and short range communication upon approach, enabling efficient power transfer control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wireless communication is used to transmit vehicle information to the ground power supplying apparatus, then power supply control can be achieved, but communication delay occurs at high vehicle speeds

Engineering Contradiction:

Improvepower supply control reliabilityVSAvoidcommunication delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The communication process is segmented into two distinct phases: a first communication phase using wide area wireless communication for preliminary information exchange, and a second communication phase using short range wireless communication for critical real-time data transmission. This segmentation allows each communication method to be optimized for its specific function, resolving the contradiction between reliable control and communication delay.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Vehicle information is transmitted in advance using wide area wireless communication before the vehicle reaches the ground power supplying apparatus. This preliminary action ensures that the ground power supplying apparatus has advance knowledge of vehicle parameters, allowing it to prepare for power supply control and reducing the need for delayed real-time communication.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If short range wireless communication is used for vehicle identification, then accurate vehicle recognition is achieved, but communication distance is limited

Engineering Contradiction:

Improvevehicle identification accuracyVSAvoidcommunication distance

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The communication distance requirement is segmented across two communication methods: wide area wireless communication provides long-distance coverage for initial contact, while short range wireless communication provides accurate vehicle identification when the vehicle is in proximity. Each method operates within its optimal distance range, collectively solving both the accuracy and distance requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Wide area wireless communication acts as an intermediary that bridges the gap between long-distance detection and short-range accurate identification. It transmits vehicle information over long distances to prepare the ground power supplying apparatus, while the short range communication takes over for precise vehicle recognition, creating a seamless transition between distance ranges.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Ensures timely and efficient power supply control even at high vehicle speeds by utilizing dual communication methods, ensuring seamless power transfer.

Implementation Method 1

noncontact power supplying systems using transmission methods such as magnetic field coupling (electromagnetic induction), electric field coupling, magnetic field resonant coupling (magnetic field resonance)

Methodology Applied

Scientific EffectMagnetic field resonant coupling: Resonance

Implementation Method 2

vehicle side first communication device for directly or indirectly communicating with the ground power supplying apparatus by utilizing wide area wireless communication

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS12459379B2Vehicle, ground power supplying apparatus, and noncontact power supplying system

Publication Date: 2025.11.04 TOYOTA JIDOSHA KK

AI summary

A vehicle receiving power from a ground power supplying apparatus by noncontact includes: a vehicle side first communication device for directly or indirectly communicating with the ground power supplying apparatus by utilizing wide area wireless communication; a vehicle side second communication device for directly communicating with the ground power supplying apparatus by utilizing short range wireless communication; and a control device for making the vehicle side first communication device transmit vehicle information tied with vehicle identification information to the ground power supplying apparatus and making the vehicle side second communication device transmit the vehicle identification information to the ground power supplying apparatus after the vehicle side first communication device transmits the vehicle information, when the vehicle receives power from the ground power supplying apparatus.