IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0699225
(2015-04-29)
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등록번호 |
US-9677512
(2017-06-13)
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발명자
/ 주소 |
- Dudar, Aed M.
- Yang, Dennis Seung-Man
- Pearce, Russell Randall
- Aghili, Mohammad R.
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출원인 / 주소 |
- Ford Global Technologies, LLC
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
2 |
초록
▼
A method for a fuel system is provided. A vacuum is applied to a fuel vapor canister side of the fuel system, and hydrocarbon breakthrough is indicated responsive to a fuel vapor canister side pressure inflection point indicative of a decay in fuel vapor canister side vacuum. In this way, an evapora
A method for a fuel system is provided. A vacuum is applied to a fuel vapor canister side of the fuel system, and hydrocarbon breakthrough is indicated responsive to a fuel vapor canister side pressure inflection point indicative of a decay in fuel vapor canister side vacuum. In this way, an evaporative leak check module may perform a leak check on a fuel vapor canister, while hydrocarbon breakthrough from the fuel vapor canister may be indicated without requiring a dedicated hydrocarbon sensor in the canister vent line.
대표청구항
▼
1. A method for a fuel system, comprising: applying a vacuum to a fuel vapor canister side of the fuel system;responsive to a fuel vapor canister side pressure inflection point indicative of a decay in fuel vapor canister side vacuum, indicating hydrocarbon breakthrough; andresponsive to the fuel va
1. A method for a fuel system, comprising: applying a vacuum to a fuel vapor canister side of the fuel system;responsive to a fuel vapor canister side pressure inflection point indicative of a decay in fuel vapor canister side vacuum, indicating hydrocarbon breakthrough; andresponsive to the fuel vapor canister side pressure reaching a plateau prior to reaching a reference threshold, indicating hydrocarbon breakthrough. 2. The method of claim 1, further comprising: ceasing applying the vacuum to the fuel vapor canister side responsive to the fuel vapor canister side pressure inflection point. 3. The method of claim 2, further comprising: responsive to a purge flow summation greater than a threshold, setting a reference threshold for a fuel vapor canister side leak test. 4. The method of claim 3, further comprising: following setting the reference threshold for the fuel vapor canister side leak test, re-applying the vacuum to the fuel vapor canister side of the fuel system. 5. The method of claim 1, further comprising: adjusting a fuel vapor canister purge operation schedule based on indicated degradation. 6. The method of claim 1, further comprising: responsive to the fuel vapor canister side pressure reaching the reference threshold, indicating the fuel vapor canister side of the fuel system is intact. 7. The method of claim 1, further comprising: prior to applying the vacuum to the fuel vapor canister side, setting a reference threshold for a fuel vapor canister side leak test. 8. A method for a fuel system, comprising: applying a vacuum to a fuel vapor canister side of the fuel system;responsive to a fuel vapor canister side pressure inflection point indicative of a decay in the fuel vapor canister side vacuum;prior to applying the vacuum to the fuel vapor canister side, setting a reference threshold for a fuel vapor canister side leak test;responsive to a fuel vapor canister side pressure reaching a plateau prior to reaching the reference threshold, ceasing applying the vacuum to the fuel vapor canister side; andindicating to re-apply the vacuum to the fuel vapor canister side responsive to a purge flow summation greater than a threshold. 9. The method of claim 8, further comprising: indicating degradation of the fuel vapor canister side of the fuel system responsive to the fuel vapor canister side pressure plateauing prior to reaching the reference threshold upon vacuum re-application. 10. The method of claim 8, further comprising: responsive to the fuel vapor canister side pressure reaching the reference threshold upon vacuum re-application, indicating the fuel vapor canister side of the fuel system is intact. 11. The method of claim 10, further comprising: maintaining a fuel vapor canister purge operation schedule responsive to the indication of the intact fuel vapor canister side of the fuel system. 12. A fuel system for a vehicle, comprising: a fuel vapor canister coupled to an engine intake via a canister purge valve;a fuel tank coupled to the fuel vapor canister via a fuel tank isolation valve;an evaporative leak check module coupled between the fuel vapor canister and atmosphere;a pressure sensor coupled to the evaporative leak check module; anda controller configured with instructions stored in non-transitory memory, which, when executed, cause the controller to: close the fuel tank isolation valve and the canister purge valve;at the evaporative leak check module, determine a reference threshold indicative of fuel vapor canister degradation;at the evaporative leak check module, apply a vacuum to the fuel vapor canister;responsive to a fuel vapor canister pressure reaching a plateau, indicating to re-test the fuel vapor canister responsive to a purge flow summation greater than a threshold; andresponsive to a fuel vapor canister pressure inflection point prior to reaching the reference threshold, indicating to re-test the fuel vapor canister responsive to the purge flow summation greater than the threshold. 13. The fuel system of claim 12, wherein the controller is further configured with instructions stored in non-transitory memory, which, when executed, cause the controller to: indicate degradation of the fuel vapor canister responsive to the fuel vapor canister pressure plateauing prior to reaching the reference threshold upon re-testing. 14. The fuel system of claim 12, wherein the controller is further configured with instructions stored in non-transitory memory, which, when executed, cause the controller to: responsive to a fuel vapor canister side pressure reaching the reference threshold upon re-testing, indicate that the fuel vapor canister is intact. 15. The fuel system of claim 12, wherein the purge flow summation is based on an amount of atmospheric air drawn through the fuel vapor canister and into the engine intake. 16. The fuel system of claim 12, wherein the purge flow summation threshold is based on a load of the fuel vapor canister. 17. A method for an evaporative emissions system, comprising: determining a reference threshold indicative of degradation of a fuel vapor canister side of the evaporative emissions system;applying a vacuum to the fuel vapor canister side;responsive to a fuel vapor canister side pressure reaching a plateau or inflection point prior to reaching the reference threshold, indicating to re-apply the vacuum to the fuel vapor canister side responsive to a purge flow summation greater than a threshold; andnot indicating degradation of the fuel vapor canister side responsive to the fuel vapor canister side pressure reaching the plateau or inflection point prior to reaching the reference threshold. 18. The method of claim 17, further comprising: indicating degradation of the fuel vapor canister side responsive to the fuel vapor canister side pressure plateauing prior to reaching the reference threshold upon re-applying the vacuum to the fuel vapor canister side of the evaporative emissions system. 19. The method of claim 17, further comprising: indicating the fuel vapor canister side of the evaporative emissions system is intact responsive to the fuel vapor canister side pressure reaching the reference threshold upon re-applying the vacuum to the fuel vapor canister side of the evaporative emissions system.
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