Method for checking the gas tightness of a fuel cell system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01L-007/00
G01M-003/32
H01M-008/04
G01M-003/00
출원번호
US-0386473
(2012-09-25)
등록번호
US-9297718
(2016-03-29)
우선권정보
DE-10 2012 005 692 (2012-03-21)
국제출원번호
PCT/EP2012/004008
(2012-09-25)
국제공개번호
WO2013/139356
(2013-09-26)
발명자
/ 주소
Van Doorn, Rene
출원인 / 주소
AUDI AG
대리인 / 주소
Staas & Halsey LLP
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
A method checks the gas tightness of a fuel cell system which has a fuel cell and a container for storing hydrogen gas. The container is connected to the fuel cell via a line along which a pressure sensor is arranged to measure a pressure of hydrogen gas flowing to the fuel cell. A quantity of hydro
A method checks the gas tightness of a fuel cell system which has a fuel cell and a container for storing hydrogen gas. The container is connected to the fuel cell via a line along which a pressure sensor is arranged to measure a pressure of hydrogen gas flowing to the fuel cell. A quantity of hydrogen gas flowing to the fuel cell is calculated by a quantity/pressure relationship which describes a relationship between the pressure and the quantity of hydrogen gas. A current which is generated by the fuel cell is measured and a quantity of hydrogen gas which has been converted into electricity by the fuel cell is calculated by a quantity/current relationship which describes a relationship between the current generated by the fuel cell and the quantity of burnt hydrogen gas. The calculated quantities of hydrogen gas are compared with one another.
대표청구항▼
1. A method for checking gas tightness of a fuel cell system which has a fuel cell and a container for storing hydrogen gas, the method comprising: using a pressure sensor on a line connecting the container to the fuel cell to measure a pressure of hydrogen gas flowing to the fuel cell in the line;c
1. A method for checking gas tightness of a fuel cell system which has a fuel cell and a container for storing hydrogen gas, the method comprising: using a pressure sensor on a line connecting the container to the fuel cell to measure a pressure of hydrogen gas flowing to the fuel cell in the line;calculating a quantity of hydrogen gas flowing to the fuel cell using a quantity/pressure relationship which describes a relationship between pressure and quantity of hydrogen gas;measuring a current generated by the fuel cell;calculating a quantity of hydrogen gas which has been converted into electricity by the fuel cell using a quantity/current relationship which describes a relationship between current generated by the fuel cell and quantity of burnt hydrogen gas;comparing the quantity of hydrogen gas flowing to the fuel cell with the quantity of hydrogen gas which has been converted into electricity;detecting a leak if the quantity of hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas which has been converted into electricity;measuring a temperature of the container to determine a temperature of hydrogen gas in the container;comparing the temperature of hydrogen gas with a temperature of surrounding air and determining a throughput rate of hydrogen gas for the container based on a Joule-Thomson effect;if the container is closed and the temperature of the container differs from the temperature of the surrounding air, detecting a leak in the container based on the Joule-Thomson effect; andcontrolling the fuel cell system to take remedial action in response to detecting the leak if the quantity of hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas which has been converted into electricity, or in response to detecting the leak in the container based on the Joule-Thomson effect if the container is closed and the temperature of the container differs from the temperature of the surrounding air. 2. The method as claimed in claim 1, wherein the ideal gas equation is used for the quantity/pressure relationship. 3. The method as claimed in claim 1, wherein a Virial equation for hydrogen gas is used for the quantity/pressure relationship. 4. The method as claimed in claim 1, wherein a characteristic curve relationship is used for the quantity/pressure relationship. 5. The method as claimed in claim 1, wherein Faraday's law is used for the quantity/current relationship. 6. The method as claimed in claim 1, wherein a characteristic curve relationship is used for the quantity/current relationship. 7. The method as claimed in claim 1, wherein for the pressure of hydrogen gas flowing to the fuel cell, a plurality of measured pressure values are summed to calculate the quantity of hydrogen gas flowing to the fuel cell, andcurrent generated by the fuel cell, a plurality of measured current values are summed to calculate the quantity of hydrogen gas which has been converted into electricity. 8. The method as claimed in claim 1, wherein the fuel cell system has a plurality of containers for storing hydrogen gas,the plurality of containers are connected to the fuel cell via a common line on which the pressure sensor is arranged, andto check gas tightness, the pressure sensor measures the pressure of hydrogen gas flowing to the fuel cell while only one of the containers is opened and all other containers are closed. 9. The method as claimed in claim 1, further comprising: determining a quantity of air which flows to the fuel cell, andcomparing the quantity of air which flows to the fuel cell with at least one of: the quantity of hydrogen gas flowing to the fuel cell, andthe quantity of hydrogen gas which has been converted into electricity. 10. The method as claimed in claim 9, wherein determining the quantity of air which flows to the fuel cell comprises measuring a pressure of the air and calculating the quantity of the air which flows to the fuel cell from the pressure of the air using a quantity/pressure relationship. 11. The method as claimed in claim 1, wherein the fuel cell system has a plurality of containers for storing hydrogen gas,the temperature is measured for each of the plurality of containers, to determine a plurality of temperatures of hydrogen gas respectively in the plurality of containers, andthe temperatures of hydrogen gas respectively in the plurality of containers are compared with one another. 12. The method as claimed in claim 1, wherein controlling the fuel cell system to take remedial action comprises performing internal checks to determine whether the pressure sensor is faulty. 13. The method as claimed in claim 1, wherein controlling the fuel cell system to take remedial action comprises deactivating the fuel cell system or operating the fuel cell system in an emergency mode. 14. The method as claimed in claim 1, wherein the fuel cell system is disposed in a motor vehicle, andcontrolling the fuel cell system to take remedial action comprises deactivating the fuel cell system. 15. The method as claimed in claim 1, wherein the fuel cell system is disposed in a motor vehicle, andcontrolling the fuel cell system to take remedial action comprises operating the fuel cell system in an emergency mode. 16. The method as claimed in claim 15, further comprising operating the motor vehicle with reduced power in response to detecting the leak if the quantity of hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas which has been converted into electricity, or in response to detecting the leak in the container based on the Joule-Thomson effect if the container is closed and the temperature of the container differs from the temperature of the surrounding air. 17. The method as claimed in claim 15, further comprising providing an indication motor vehicle service is needed in response to detecting the leak if the quantity of hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas which has been converted into electricity, or in response to detecting the leak in the container based on the Joule-Thomson effect if the container is closed and the temperature of the container differs from the temperature of the surrounding air. 18. A system to check gas tightness of a fuel cell system which has a fuel cell and a container for storing hydrogen gas, comprising: a pressure sensor to measure a pressure of hydrogen gas flowing to the fuel cell in a line connecting the container to the fuel cell;a current measuring device to measure a current generated by the fuel cell;a temperature sensor to measure a temperature of the container to determine a temperature of hydrogen gas in the container; anda control device to: calculate a quantity of hydrogen gas flowing to the fuel cell based on the pressure measured, using a quantity/pressure relationship;calculate a quantity of hydrogen gas burnt by the fuel cell based on the current measured, using a quantity/current relationship;compare the quantity of hydrogen gas flowing to the fuel cell with the quantity of hydrogen gas burnt by the fuel cell;detect a leak if the calculated quantity of the hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas burnt by the fuel cell;compare the temperature of hydrogen gas in the container with a temperature of surrounding air and to determine a throughput rate of hydrogen gas for the container based on a Joule-Thomson effect;if the container is closed and the temperature of the container differs from the temperature of surrounding air, identifying a potential leak in the container, based on the Joule-Thomson effect; andcontrol the fuel cell system to take remedial action in response to detecting the leak if the quantity of hydrogen gas flowing to the fuel cell is greater than the quantity of hydrogen gas which has been converted into electricity, or in response to detecting the leak in the container based on the Joule-Thomson effect if the container is closed and the temperature of the container differs from the temperature of the surrounding air.
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이 특허에 인용된 특허 (1)
Thyroff,Jurgen, Method for leak detection in gas feeding systems with redundant valves.
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