Abstract:
Disclosed are a system and method for starting a fuel cell vehicle in an emergency, comprising: a high voltage converter having one side to be connected to a high voltage battery by a battery switch and the other side to be connected to a fuel cell in parallel; a balance-of-plant (BOP) connected to the high voltage converter and the fuel cell in parallel; and a controller for controlling to supply power of the high voltage battery to the BOP without converting by connecting the battery switch when the high voltage converter or the high voltage battery are broken.
Abstract:
The present invention relates to a clod shutdown (CSD) method of a fuel cell vehicle. The CSD method is capable of improving a problem of an automatic CSD performing manner by a controller as well as a problem of a manual manner using a CSD button. The CSD method of a fuel cell vehicle includes the steps of: determining, by a controller, whether a vehicle is in a CSD on condition or in a CSD off condition by using an air temperature detected by an air temperature sensor while the vehicle is driven; displaying and memorizing, by a display means, a CSD on state or a CSD off state so that a driver can identify the CSD state according to the determination result; reversing the CSD on state or the CSD off state displayed in the display means when the driver operates a CSD button to be inputted, simultaneously memorizing the reversed CSD on state or CSD off state, and maintaining a previous display state if the driver does not operate the CSD button to be inputted; and controlling a CSD mode to perform the CSD during a predetermined time when the vehicle is currently in the CSD on state if the controller detects an key off input.
Abstract:
PURPOSE: A control method for cold start preconditioning of a fuel cell stack is provided to reduce air blower operation by controlling preconditioning control, and to improve cold start performance of a fuel cell vehicle. CONSTITUTION: A control method for cold start preconditioning of a fuel cell stack comprises a step of sensing a key-off and a deciding whether a detected temperature is less than a standard temperature; a step of calculating residual water amount in the stack or water-containing amount of the membrane of the fuel cell system in real time when the external temperature is less than the standard temperature; a step of preconditioning control for the fuel cell system based on the calculated value. [Reference numerals] (AA,CC) Air blower rotation number; (BB) Remaining water amount estimated value in a stack; (DD) Membrane water content estimated value;
Abstract:
본 발명은 연료전지 차량용 워터트랩 장치의 제어방법에 관한 것으로서, 연료전지의 운전 동안 워터트랩 배출밸브의 이전 마지막 개폐시점으로부터 현 시점까지의 경과시간인 워터트랩 배출밸브 대기시간 또는 현 시점까지의 연료전지 스택 전류 적산량이 미리 설정된 비교값 이상이면 워터트랩 배출밸브를 강제 개폐하여 워터트랩 내 물을 배출하고, 또한 비교값 이상인 횟수가 일정 횟수 이상이 되면 워터트랩 수위센서의 고장상태로 판단하여 운전자 인터페이스부의 경고표시수단을 작동시키는 동시에 워터트랩 배출밸브의 추가 강제 개폐를 실시하도록 구성한 연료전지 차량용 워터트랩 장치의 제어방법에 관한 것이다. 이러한 본 발명의 제어방법에 의하면, 워터트랩 수위센서의 고장 발생시에 워터트랩 배출밸브 대기시간 또는 연료전지 스택의 소모 전류 총합인 전류 적산량이 일정 조건을 만족하면 워터트랩 배출밸브를 개폐 동작시키므로, 수위센서의 고장이 발생하더라도 워터트랩 내 물 배출을 원활히 수행할 수 있고, 애노드의 플러딩 발생 및 연료전지 성능 저하를 효과적으로 방지할 수 있게 된다. 연료전지, 스택, 워터트랩, 수위센서
Abstract:
PURPOSE: An air and coolant control system is provided to reduce a temperature surge in the catalysts at a dynamic load change, minimize the parasitic power, and optimize oxygen starvations in the air supply system. CONSTITUTION: An air and coolant control system(600A) comprises: a heat source comprising an air inlet, a coolant inlet, and a coolant outlet fluidly coupled to the coolant inlet through the heat source, wherein the heat source is configured to receive air through the air inlet, to generate heat in response to receiving the air, to receive coolant through the coolant inlet, to conduct the received coolant to the coolant outlet, and to transfer a portion of the generated heat to the received coolant, thereby removing the portion of the generated heat from the heat source as the coolant is conducted out of the heat source through the coolant outlet; an air supply source(620) fluidly coupled to the air inlet of the heat source and configured to supply the air to the heat source; an air supply control system(615) configured to adjust the flow rate of air from the air supply source to the heat source based on a dynamic feedback temperature characteristic from the heat source; a coolant supply source fluidly coupled to the coolant inlet of the heat source and configured to supply the coolant to the heat source; and a coolant control system configured to adjust the flow rate of the coolant supplied to the heat source based on an estimated feed-forward heat source characteristic and to adjust the temperature of the coolant supplied to the heat source based on the dynamic feedback temperature characteristic.
Abstract:
A heat and air control method of a fuel-cell system is provided to secure air flow through relative low temperature drive in a high power section, to prevent the degradation of stack and to reduce consumption output of an air blower. A heat and air control method of a fuel-cell system comprises an air flux sensor measuring the air flow flown into the air blower; a coolant inlet temperature sensor measuring the temperature of cooling water flown into the fuel cell stack; a coolant outlet temperature sensor measuring the temperature of cooling water flown from the fuel cell stack; a coolant pump for controlling the temperature of cooling water inlet and outlet; a radiator fan for controlling the temperature of the cooling water flown into the cooling water inlet of the fuel cell stack; and a power control unit controlling the output of the whole of the fuel system.