FUEL CELL SYSTEM, FUEL CELL VEHICLE, AND METHOD OF CONTROLLING FUEL CELL SYSTEM

• Main Authors: KAKENO YUJI, NADA MITSUHIRO, NISHIDA YUSUKE, UMAYAHARA KENJI
• Format: Patent
• Language: English; Korean
• Published: 24.05.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; VEHICLES IN GENERAL

The purpose of the present invention is to prevent secondary battery overcharging during a rapid decrease in motor power consumption. A fuel cell system that is mounted in a vehicle is provided with: a fuel cell; a secondary battery; an SOC detection unit detecting the temperature and power storage amount of the secondary battery; an accelerator position detection unit detecting an accelerator depression amount; and a control unit controlling power generated by the fuel cell. The control unit is provided with a power generation demand calculation unit calculating a power generation demand based on the accelerator depression amount, the temperature of the secondary battery, and the power storage amount and an upper limit power demand calculation unit calculating an upper limit power demand based on the accelerator depression amount, the temperature of the secondary battery, and the power storage amount. The upper limit power demand includes allowable charging power correlated with an upper limit value of charging power. When it is determined that a condition of rapid motor power consumption decrease is satisfied, the control unit calculates the upper limit power demand by setting the allowable charging power to zero. In a case where the power generation demand exceeds the upper limit power demand, the control unit executes power generation responding to the upper limit power demand. 본 발명은 모터 소비 전력의 급감 시에 있어서의 이차 전지의 과충전의 발생을 저감시키는 것을 목적으로 한다. 차량에 탑재되는 연료 전지 시스템은, 연료 전지와, 이차 전지와, 이차 전지의 온도 및 축전량을 검출하는 SOC 검출부와, 액셀러레이터 답입량을 검출하는 액셀러레이터 위치 검출부와, 연료 전지의 발전 전력을 제어하는 제어부를 구비하고, 제어부는 액셀러레이터 답입량, 이차 전지의 온도, 축전량에 기초하여 발전 요구 전력을 산출하는 발전 요구 전력 산출부와, 액셀러레이터 답입량, 이차 전지의 온도, 축전량에 기초하여 상한 요구 전력을 산출하는 상한 요구 전력 산출부를 구비하고, 상한 요구 전력에는, 충전 전력의 상한값과 상관하는 허용 충전 전력이 포함되어 있고, 제어부는 모터의 소비 전력이 급감하는 조건을 만족하고 있다고 판정하면, 허용 충전 전력을 제로로 해서 상한 요구 전력을 산출하고, 발전 요구 전력이 상한 요구 전력을 상회하는 경우, 상한 요구 전력에 대응한 발전을 실행시킨다.