EV Charger Selection Using Vehicle and Charger Current Maps

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Solution Overview

Problem

The charging performance of electrically driven vehicles varies by model and grade, and using a charging facility with lower performance limits the vehicle's charging capabilities.

Innovation Solution

A charger selection system that includes charge control maps for both chargers and vehicles, allowing for the selection of a charger that minimizes performance limitations based on factors like temperature, secondary battery state of charge (SOC), voltage, and time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a charging facility with lower charging performance is used, then the charging facility can be more widely accessible and compatible, but the charging performance of the electrically driven vehicle cannot be fully utilized

Engineering Contradiction:

Improvecharger compatibilityVSAvoidcharging performance

Core Design Contradiction:

Adaptability or versatilityVSPower

Solution Approach 1:

The system changes parameters by creating multiple charge control maps with different upper limit current values corresponding to different charger models and vehicle models. By selecting appropriate parameter combinations from these maps based on the specific charger and vehicle being used, the system optimizes charging performance for each pairing while maintaining broad compatibility across different charger types.

Inventive Principle:

Principle #35Parameter changes

2Power

If charge control maps with detailed specifications are created for both chargers and vehicles, then charging performance can be optimized, but system complexity increases

Engineering Contradiction:

Improvecharging performanceVSAvoidsystem complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The system segments the charge control information into separate charge control maps for chargers and vehicles, with each map containing model-specific upper limit current specifications. This segmentation allows the complex data to be organized in a structured manner that is easier to manage and query, reducing the operational complexity despite the detailed information stored.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The charge control maps serve as intermediary data structures that mediate between the charger specifications and vehicle requirements. Rather than directly comparing all charger parameters with all vehicle parameters, the system uses these pre-prepared maps as intermediate references to quickly determine compatible pairings and optimal charging parameters.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12576743B2Charger selection system, charger selection method, and charger selection program

Publication Date: 2026.03.17 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A charge control map for chargers specifies the relationship between an upper limit current and charging conditions including at least one of the temperature of the chargers, the state of charge (SOC) of a secondary battery mounted in an electrically driven vehicle to be charged, the voltage of the secondary battery, and time. A charge control map for an electrically driven vehicle specifies the relationship between an upper limit current and charging conditions including at least one of the temperature of the secondary battery, the SOC of the secondary battery, the voltage of the secondary battery, and time. A charger selection unit (118) selects a charger used for charging any electrically driven vehicle of a plurality of electrically driven vehicles from among the plurality of chargers. The charger selection unit (118) selects at least one charger that least limits the charging performance of the electrically driven vehicle to be charged.