Non-contact Power Supply Communication Pattern Matching

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Solution Overview

Problem

The existing non-contact power supply systems for electric vehicles face challenges in accurately distinguishing power values and timing, leading to a high likelihood of erroneous communication establishment between vehicles and power supply devices due to the use of 256-value random numbers.

Innovation Solution

A power pattern list is generated by allocating identification information to power patterns based on a set rule, transmitted to the power supply device, and used to determine paired communication by comparing detected power patterns with the list, ensuring accurate coupling between vehicles and power supply devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a non-contact power supply is utilized to establish communication between vehicle and power supply device, then power can be supplied without contact, but the power value or supply timing cannot be distinguished at high resolution leading to erroneous communication establishment

Engineering Contradiction:

Improvecontactless power supplyVSAvoidpower value and timing distinction

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The power supply is divided into multiple discrete power patterns with different characteristics (power values, supply timings, cycles). Each power pattern serves as a distinct signal type that can be individually recognized by the vehicle's detection means, enabling high-resolution distinction despite contactless transmission

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different power patterns are defined by varying parameters such as power value (Ptest), supply timing (Ttest), and cycle patterns. These parameter variations allow the system to encode multiple types of information in the power supply signal itself, enabling accurate distinction and reliable communication establishment

Inventive Principle:

Principle #35Parameter changes

2Extent of automation

If 256-value random number is used for power supply control, then communication establishment is attempted, but there is high possibility of erroneous recognition due to limited resolution

Engineering Contradiction:

Improveautomatic communication establishmentVSAvoidcommunication establishment accuracy

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The vehicle's detection means detects the actual power pattern received and feeds this information back for comparison with the stored power pattern list. This feedback mechanism allows verification of correct recognition and enables retransmission or correction if erroneous recognition occurs, significantly improving reliability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The power pattern list is pre-generated and stored in the vehicle's storage means before actual communication attempts. This preliminary preparation includes multiple distinct power patterns with unique characteristics, allowing the system to reliably identify the correct pattern even with limited random number resolution

Inventive Principle:

Principle #10Preliminary action

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 approach enables reliable communication and power transfer between vehicles and power supply devices by accurately matching power patterns, enhancing the accuracy of communication establishment and reducing errors.

Implementation Method 1

outputting power from a power transmission coil 11 to a power reception coil 21

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9834104B2Communication establishment between vehicle and power supply device of non-contact power supply system

Publication Date: 2017.12.05 NISSAN MOTOR CO LTD

AI summary

A non-contact power supply system supplies power in a non-contact manner between a power transmission coil of a power supply device and a power reception coil of a vehicle. The power supply device side communication unit transmits identification information of the power supply device to the vehicle. The generation unit generates a power pattern list by allocating each piece of the identification information that is received by the vehicle side communication unit to several power patterns based on a prescribed rule. The vehicle side communication unit transmits the power pattern list to the power supply device. The controller causes power to be outputted from the power transmission coil to the power reception coil according to a power pattern which corresponds to the identification information. The determination unit determines establishment of a paired communication based on a comparison the detected power pattern and a power pattern.