Abstract:
PURPOSE: An apparatus and a method for predicting the coolant temperature of fuel cell system are provided to secure the controlling stability of the apparatus and to effectively prevent the overheat and the damage of a fuel cell stack. CONSTITUTION: A first temperature sensor detects the temperature of coolant at one side of the inlet or the outlet of a fuel cell stack(10). A flow meter(15) measures the flux of the coolant during the operation of a fuel cell. A controller(1) measures the heating value of the fuel cell stack. The controller predicts the temperature of coolant at another side of the inlet and the outlet of the fuel cell based on the flux of the coolant, the heating value of the fuel cell stack, and the detected temperature of the coolant.
Abstract:
PURPOSE: Apparatus and method for removing water within a fuel cell are provided to improve cold starting of a fuel cell by rapidly removing water present in the cell of a fuel cell stack without the addition and use of a bypass line or suction pump. CONSTITUTION: An apparatus for removing water within a fuel cell comprises: a current application device which is connected to a cathode and an anode of a fuel cell stack and applies current for electrolysis of water between the cathode and the anode; a cell voltage detection part for detecting the cell voltage of the fuel cell stack; and a controller for controlling the current output of the current application device so that a set reference voltage is not the set reference voltage or more.
Abstract:
PURPOSE: A method for detecting the ice blocking of a fuel cell stack is provided to detect the ice blocking on the surface of an electrode in a real time by analyzing a minimum cell voltage of the fuel cell stack and to distinguish the ice blocking of a cathode and the ice blocking of an anode. CONSTITUTION: A method for detecting the ice blocking of a fuel cell stack comprises the steps of: (i) periodically calculating a minimum cell voltage of a fuel cell stack from a cell voltage measured value of a cell voltage monitoring device in the state where a reaction gas is supplied to the fuel cell stack; (ii) calculating the variation of the minimum cell voltage using the present value of the calculated minimum cell voltage and the previous value of the minimum cell voltage; (iii) determining whether the variation of the minimum cell voltage is a set standard value or greater; and (iv) if the variation of the minimum cell voltage is a set standard value or greater, determining that the ice blocking is generated in an anode of a fuel cell stack.
Abstract:
PURPOSE: A method for controlling a fuel cell system is provided to improve cold starting-up of vehicles by increasing the temperature of a stack to a predetermined value or more without the change of the configuration of a system and a stack. CONSTITUTION: A method for controlling a fuel cell system comprises the steps of: (S1) if a staring key is operated, determining whether a cold starting condition is right or not; (S2) if a cold starting condition is right, a first flow path for air supply and a second flow path for air discharge are closed, a third flow path connecting the second flow path and the stack is opened, the fuel is supplied to the stack; (S3); opening the first flow path and the second flow path, and supplying the air to the stack; (S4) determining whether the temperature of the stack is the predetermined value or greater or not; and (S5) if the temperature of the stack is the predetermined value or greater, performing the normal operation of a fuel cell system by supplying the fuel and air to the stack.
Abstract:
본 발명은 연료전지용 분리판에 관한 것으로서, 더욱 상세하게는 연료전지의 기체확산층과 접촉되는 분리판의 랜드부에 벤튜리 관과 같은 물 배출용 홀 또는 물의 응축을 위한 금속판 등을 포함하는 물 배출수단을 형성하고, 연료전지 반응에 의하여 생성된 물이 기체확산층으로부터 물 배출수단을 통해 매우 용이하게 배출될 수 있도록 한 연료전지용 분리판에 관한 것이다. 이를 위해, 본 발명은 연료전지의 기체확산층과 접촉되며 접합되는 랜드와, 각 랜드 사이의 공간으로서 수소 또는 공기의 통로가 되는 유로를 포함하는 연료전지용 분리판에 있어서, 상기 랜드와 유로간에 복수개의 물 배출수단을 별도로 형성하여, 상기 기체확산층으로부터 유로를 향해 물 배출이 원할하게 이루어질 수 있도록 한 것을 특징으로 하는 연료전지용 분리판을 제공한다. 연료전지, 분리판, 물 배출수단, 물 배출홀, 랜드, 유로, 기체확산층
Abstract:
본 발명은 주동력원인 연료전지와 보조동력원인 축전수단을 구비한 연료전지 하이브리드 차량의 아이들 스탑/해제 제어 방법에 관한 것으로서, 특히 연료전지의 저효율 구간인 저출력 구간 및 회생제동 구간에서 공기 공급/수소 공급을 중지한 뒤 잔류 산소/수소를 소모시켜 스택 전압을 떨어뜨리는 과정으로 연료전지를 정지시키는 것에 주된 특징이 있는 것이다. 이러한 본 발명의 제어 방법에 의하면, 연료전지의 저효율 구간에서 연료전지 보기류의 작동을 중지하게 되므로 연비 및 시스템 효율이 향상되고, 연료전지로부터 축전수단으로의 자동 충전 및 그로 인한 축전수단의 전압 상승을 방지하게 되므로 회생제동량 증대 및 연비 향상의 효과가 있게 된다. 또한 본 발명은 연료전지의 비발전 구간에서 연료전지를 최적의 상태로 유지할 수 있는 비발전 구간 제어 방법을 포함하며, 연료전지의 열화 방지 및 내구성 향상에 기여할 수 있게 된다. 연료전지, 하이브리드, 축전수단, 슈퍼캡, 아이들 스탑, 회생제동
Abstract:
PURPOSE: A hydrogen humidification apparatus for fuel cell stack is provided, to allow the humidity of hydrogen to be controlled actively and to reduce the equipment space, the weight and the manufacturing cost. CONSTITUTION: The hydrogen humidification apparatus comprises a mixing chamber(52) which is loaded at the hydrogen inflow part where hydrogen is flown in through a supply line(7), allowing the hydrogen to pass the mixing chamber; an injector(54) which is provided with a nozzle exit(54a) allowing the water supplied from the external water supply means(53) into the mixing chamber(52); a humidity sensor which is loaded at the position allowing the hydrogen to pass inside the fuel cell stack(1) and outputs the signal according to the humidity of hydrogen; and a controller(58) which receives the signal from the humidity sensor and controls the amount of water sprayed from the injector(54).
Abstract:
A fuel cell system is disclosed. The disclosed fuel cell system comprises: i) a stack consisting of an assembly of fuel cells, ii) an air supply unit for supplying air to an air electrode of the fuel cell, iii) a hydrogen supply unit for supplying hydrogen to a fuel electrode of the fuel cell, and iv) a connection unit for connecting an air supply path for supplying air to the air electrode from the air supply unit, and a hydrogen supply path for supplying hydrogen to the fuel electrode from the hydrogen supply unit. Hydrogen can be supplied to the air electrode through the connection unit when operating at a low temperature that is less than or equal to the optimal operation temperature of the stack.