IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0171469
(2002-06-14)
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발명자
/ 주소 |
- Veinotte, Andre
- Perry, Paul
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출원인 / 주소 |
- Siemens VDO Automotive, Incorporated
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인용정보 |
피인용 횟수 :
9 인용 특허 :
4 |
초록
▼
A method of managing pressure in a fuel system supplying fuel to an internal combustion engine. The method includes providing a fuel tank including a headspace, connecting to the headspace an intake manifold of the internal combustion engine, a fuel vapor collection canister, a purge valve, and a fu
A method of managing pressure in a fuel system supplying fuel to an internal combustion engine. The method includes providing a fuel tank including a headspace, connecting to the headspace an intake manifold of the internal combustion engine, a fuel vapor collection canister, a purge valve, and a fuel vapor pressure management apparatus, detecting the vacuum that naturally forms in the headspace, and relieving excess pressure that forms in the headspace. The fuel vapor management apparatus includes a housing defining an interior chamber, excludes a diaphragm partitioning the interior chamber, and excludes an electromechanical actuator.
대표청구항
▼
1. A method of using naturally forming vacuum to evaluate a fuel system supplying fuel to an internal combustion engine, the method comprising:providing a fuel tank including a headspace;coupling in fluid communication the headspace with an intake manifold of the internal combustion engine, a fuel v
1. A method of using naturally forming vacuum to evaluate a fuel system supplying fuel to an internal combustion engine, the method comprising:providing a fuel tank including a headspace;coupling in fluid communication the headspace with an intake manifold of the internal combustion engine, a fuel vapor collection canister, a purge valve, and a fuel vapor pressure management apparatus, the fuel vapor management apparatus:including a housing defining an interior chamber;excluding a diaphragm partitioning the interior chamber; andexcluding an electromechanical actuator; anddetecting the vacuum that naturally forms in the headspace. 2. The method according to claim 1, wherein the coupling comprises connecting the fuel tank to the intake manifold via the purge valve. 3. The method according to claim 1, wherein the coupling comprises connecting the fuel vapor collection canister to the intake manifold via the purge valve. 4. The method according to claim 1, wherein the coupling comprises connecting the fuel vapor pressure management apparatus to the intake manifold via the fuel vapor collection canister and the purge valve. 5. The method according to claim 4, wherein the coupling comprises connecting the fuel vapor pressure management apparatus between the fuel vapor collection canister and atmosphere. 6. The method according to claim 1, wherein the detecting comprises sensing a negative pressure level relative to atmosphere in the fuel vapor collection canister. 7. The method according to claim 6, wherein the negative pressure level is approximately negative one inch water relative to atmosphere. 8. The method according to claim 1, wherein the fuel vapor management apparatus comprises a housing and a pressure operable device, the housing defines an interior chamber and includes first and second ports communicating with the interior chamber, and the pressure operable device separates the interior chamber into a first portion in fluid communication with the first port and a second portion in fluid communication with a second port, the pressure operable device includes a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, and the detecting occurs when there is a first negative pressure level at the first port relative to the second port and the seal is in a symmetrically deformed configuration. 9. A method of managing pressure in a fuel system supplying fuel to an internal combustion engine, the method comprising:providing a fuel tank including a headspace;connecting to the headspace an intake manifold of the internal combustion engine, a fuel vapor collection canister, a purge valve, and a fuel vapor pressure management apparatus, the fuel vapor management apparatus:including a housing defining an interior chamber;excluding a diaphragm partitioning the interior chamber; andexcluding an electromechanical actuator; andrelieving excess pressure that forms in the headspace. 10. The method according to claim 9, wherein the relieving excess pressure comprises relieving negative pressure below a negative pressure level relative to atmosphere. 11. The method according to claim 10, wherein the fuel vapor management apparatus senses the negative pressure level. 12. The method according to claim 11, wherein the negative pressure level occurs in the fuel vapor collection canister. 13. The method according to claim 9, wherein the relieving excess pressure comprises relieving positive pressure above a positive pressure level relative to atmosphere. 14. The method according to claim 13, wherein the fuel vapor management apparatus senses the positive pressure level. 15. The method according to claim 14, wherein the positive pressure level occurs in the fuel vapor collection canister. 16. The method according to claim 9, wherein the relieving excess pressure comprises relieving negative pressure below a negative pressure level relative to atmosphere and relieving positive pressure above a positive pressure level rela tive to atmosphere. 17. The method according to claim 16, wherein the fuel vapor management apparatus comprises a housing and a pressure operable device, the housing defines an interior chamber and includes first and second ports communicating with the interior chamber, and the pressure operable device separates the interior chamber into a first portion in fluid communication with the first port and a second portion in fluid communication with a second port, the pressure operable device includes a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, and the relieving negative pressure occurs when the pressure operable device permits a first fluid flow from the second port to the first port and when the seal is in an asymmetrically deformed configuration, and the relieving positive pressure occurs when the pressure operable device permits a second fluid flow from the first port to the second port and when the seal is in an undeformed configuration. 18. A method of managing pressure and using naturally forming vacuum to evaluate a fuel system supplying fuel to an internal combustion engine, the method comprising:providing a fuel tank including a headspace;coupling in fluid communication the headspace with an intake manifold of the internal combustion engine, a fuel vapor collection canister, a purge valve, and a fuel vapor pressure management apparatus, the fuel vapor management apparatus:including a housing defining an interior chamber;excluding a diaphragm partitioning the interior chamber; andexcluding an electromechanical actuator;detecting the vacuum that naturally forms in the headspace; andrelieving excess pressure that forms in the headspace. 19. The method according to claim 18, wherein the detecting comprises sensing a negative pressure level relative to atmosphere in the fuel vapor collection canister, the relieving excess pressure comprises relieving negative pressure below the negative pressure level, and the relieving positive pressure above a positive pressure level relative to atmosphere. 20. The method according to claim 19, wherein the fuel vapor management apparatus comprises a housing and a pressure operable device, the housing defines an interior chamber and includes first and second ports communicating with the interior chamber, and the pressure operable device separates the interior chamber into a first portion in fluid communication with the first port and a second portion in fluid communication with a second port, the pressure operable device includes a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, the detecting occurs when there is a first negative pressure level at the first port relative to the second port and the seal is in a symmetrically deformed configuration, the relieving negative pressure occurs when the pressure operable device permits a first fluid flow from the second port to the first port and when the seal is in an asymmetrically deformed configuration, and the relieving positive pressure occurs when the pressure operable device permits a second fluid flow from the first port to the second port and when the seal is in an undeformed configuration. 21. A method of managing pressure in a fuel system supplying fuel to an internal combustion engine, the method comprising:providing a fuel tank including a headspace;connecting in fluid communication the headspace to a fuel vapor collection canister;connecting in fluid communication the fuel vapor collection canister to a fuel vapor pressure management apparatus, the fuel vapor pressure management apparatus performing leak detection on the headspace, performing excess negative pressure relief on the headspace, and performing excess positive pressure relief on the headspace, the fuel vapor management apparatus including:a housing defining an interior chamber, the housing including first and second ports communicating with the interior chamber;a pressure operable device separating the interior chamber into a first portion in fluid communication with the first port and a second portion in fluid communication with the second port; andestablishing a fluid flow path extending between the headspace in the fuel tank to atmosphere, the establishing including passing through the fuel vapor collection canister, passing through the first port, passing through the interior chamber, and passing through the second port;relieving excess negative pressure with fluid flow in a first direction along the fluid flow path; andrelieving excess positive pressure with fluid flow in a second direction along the fluid flow path, the second direction being opposite to the first direction. 22. The method according to claim 21, wherein the pressure operable device includes a poppet movable along an axis and an annular seal adapted to cooperatively engage the poppet. 23. The method according to claim 22, wherein the establishing includes passing around the poppet and passing through the annular seal. 24. A method of using naturally forming vacuum to detect leaks in a fuel system supplying fuel to an internal combustion engine, the method comprising:coupling in fluid communication to a headspace of the fuel system a fuel vapor pressure management apparatus;coupling in electrical communication to the fuel vapor pressure management system an electrical control unit;supplying electrical current to the fuel vapor pressure management system and to the electrical control unit; andperforming a leak detection test on the headspace, the leak detection test drawing no more than 100 microamperes of the electrical current. 25. A method of using naturally forming vacuum to detect leaks in a fuel system supplying fuel to an internal combustion engine, the method comprising:coupling in fluid communication to a headspace of the fuel system a fuel vapor pressure management apparatus;performing with the fuel vapor pressure management apparatus a leak detection test on the headspace, the leak detection test occurring during a period of up to 90 minutes. 26. The method according to claim 25, wherein the period of the leak detection test is at least 20 minutes. 27. A method of using naturally forming vacuum to detect leaks in a fuel system supplying fuel to an internal combustion engine, the method comprising:coupling in fluid communication to a headspace of the fuel system a fuel vapor pressure management apparatus;performing with the fuel vapor pressure management apparatus a leak detection test on the headspace, the leak detection test occurring during a period of at least 20 minutes. 28. The method according to claim 27, wherein the period of leak detection test is greater than 90 minutes.
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