POWER SUPPLY SYSTEM FOR VEHICLE

• Main Authors: USAMI TOMOHIRO, YONEYAMA ISAO
• Format: Patent
• Language: English; Japanese
• Published: 30.03.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR

PROBLEM TO BE SOLVED: To provide a power supply system for vehicle capable of suppressing such a situation that the output from a lithium ion battery goes below the power required for actuation of a backup load.SOLUTION: A power supply system for vehicle includes an alternator capable of supplying a power to a load to be mounted on a vehicle, a lead battery connected with the alternator, a lithium ion battery connected with the lead battery and supplying a power to a backup load, and a controller (ECU22). When a determination is made that the lithium ion battery is discharging continuously, the controller measures the discharge characteristics of the lithium ion battery after elapsing a certain time, estimates the current capable of being outputted from the lithium ion battery based on the discharge characteristics, and stops continuous discharge of the lithium ion battery when a determination is made that the current capable of being outputted is smaller than the current required for actuation of the backup load.SELECTED DRAWING: Figure 1 【課題】リチウムイオン電池の出力がバックアップ負荷の作動に必要な電力を下回ることを抑制可能な車両用電源システムを提供する。【解決手段】車両に搭載される負荷に電力を供給可能なオルタネータと、オルタネータに接続された鉛電池と、鉛電池と並列にオルタネータに接続され、バックアップ負荷に電力を供給するリチウムイオン電池と、制御装置（ＥＣＵ２２）とを備える。制御装置はリチウムイオン電池が連続放電していると判定された場合、一定時間が経過した後リチウムイオン電池の放電特性を測定し、その放電特性に基づいてリチウムイオン電池が出力可能な電流を推定し、出力可能な電流がバックアップ負荷の作動に必要な電流よりも小さいと判定された場合にはリチウムイオン電池の連続放電を停止する。【選択図】図１