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公开(公告)号：US11557779B2
公开(公告)日：2023-01-17
申请号：US16673183
申请日：2019-11-04
IPC分类号： H01M8/04858 , H01M8/04537 , H01M8/04664 , B60L50/71 , B60L58/30 , B60L15/20
摘要： A current limiting method of a fuel cell stack is capable of preventing current of the fuel cell stack from rapidly dropping to prevent jerking or shock from occurring while a vehicle travels. The method includes: determining whether performance deterioration of a unit cell of the fuel cell stack has occurred, employing a feed forward control type current limiting logic of the fuel cell stack before an output of the fuel cell vehicle is lowered, decreasing the current of the fuel cell stack to a predetermined level by the feed forward control type current limiting logic, and gradually restoring the current of the fuel cell stack to a maximum current usage value from a point in time when the current of a load is used.
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公开(公告)号：US11152634B2
公开(公告)日：2021-10-19
申请号：US15724090
申请日：2017-10-03
发明人： Gun Hyung Park , Dae Jong Kim , Seung Yoon Lee
IPC分类号： H01M8/04537 , H01M10/48 , H01M16/00 , H01M8/04858
摘要： A method of controlling voltage of a fuel cell includes steps of: determining whether a mode is a high-voltage avoidance mode of the fuel cell; controlling a fuel cell stack voltage to be at a predetermined reference value or less when the mode is the high-voltage avoidance mode of the fuel cell; monitoring individual cell voltages of the fuel cell and determining whether a maximum value of the monitored individual cell voltages exceeds a predetermined individual value; reducing a reference value of the fuel cell stack voltage when the maximum value of the monitored individual cell voltages exceed the predetermined individual value; and controlling the fuel cell stack voltage at the reduced reference value or less. The method and system for controlling fuel cell voltage is provided to secure durability and performance of individual cells of a fuel cell stack.
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公开(公告)号：US10351014B2
公开(公告)日：2019-07-16
申请号：US15818364
申请日：2017-11-20
发明人： Dae Jong Kim , Gun Hyung Park , Seung Yoon Lee
IPC分类号： B60L58/40 , B60L11/18 , H01M8/04089 , H01M8/0438 , B60L58/12
摘要： An operation control device for a fuel cell vehicle includes: a stack current determination unit monitoring a stack current of the fuel cell stack and determining whether an operation state of a fuel cell stack is in an upper-limit voltage limiting section; a battery state determination unit monitoring a state of charge (SOC) of a high voltage battery and determining whether the SOC of the high voltage battery is in a set reference SOC range; and an air flow rate control unit determining a compensation for an air flow rate of an air supply system according to the SOC of the high voltage battery, and outputting a control signal to an air compressor and an air pressure control valve according to the compensated air flow rate, when the operation state of the fuel cell stack is in the upper-limit voltage limiting section.
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