System and methods for engine-off natural vacuum tests
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-041/32
F02D-041/00
B60W-020/50
F02M-025/08
F02D-041/04
F02N-011/08
F02D-041/14
출원번호
US-0300140
(2014-06-09)
등록번호
US-9664126
(2017-05-30)
발명자
/ 주소
Dudar, Aed M.
Makki, Imad Hassan
Tseng, Fling Finn
Jentz, Robert Roy
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A method for a vehicle, comprising: during a first condition, closing a canister vent valve responsive to an engine-off event without initiating an engine-off natural vacuum test; during a second condition, following the first condition, closing the canister vent valve responsive to a vehicle-off ev
A method for a vehicle, comprising: during a first condition, closing a canister vent valve responsive to an engine-off event without initiating an engine-off natural vacuum test; during a second condition, following the first condition, closing the canister vent valve responsive to a vehicle-off event; and then initiating an engine-off natural vacuum test. In this way, the completion percentage of the engine-off natural vacuum test will increase.
대표청구항▼
1. A method for a vehicle, comprising: during a first condition: receiving an indication of a first engine-off event;receiving an indication that retaining heat during the first engine-off event will increase a likelihood of an engine-off natural vacuum test executing successfully;following the firs
1. A method for a vehicle, comprising: during a first condition: receiving an indication of a first engine-off event;receiving an indication that retaining heat during the first engine-off event will increase a likelihood of an engine-off natural vacuum test executing successfully;following the first engine-off event, closing a canister vent valve based on the heat retention indication without initiating the engine-off natural vacuum test;receiving an indication of an engine-on event; andopening the canister vent valve following the engine-on event; andduring a second condition, following the first condition: receiving an indication of a vehicle-off event, including a second engine-off event;following the vehicle-off event, closing the canister vent valve based on the vehicle-off event; and theninitiating the engine-off natural vacuum test. 2. The method of claim 1, where the first condition includes a likelihood of an engine restart during a predetermined window being above a threshold. 3. The method of claim 2, where the second condition includes a likelihood of an engine restart during a predetermined window being below the threshold. 4. The method of claim 2, where the likelihood of an engine restart during the predetermined window is based on a predicted destination determined through machine learning. 5. The method of claim 1, further comprising: receiving an indication that retaining heat will increase a likelihood of the engine-off natural vacuum test executing successfully; andclosing the canister vent valve prior to the vehicle-off event based on the received indication. 6. The method of claim 5, where the indication that retaining heat will increase the likelihood of the engine-off natural vacuum test executing successfully is based on a total airmass through an engine intake during a current drive cycle being below a threshold. 7. The method of claim 1, where the first condition includes a vehicle-off event, and wherein a vehicle-on event occurs between the first condition and second condition. 8. The method of claim 1, where the indication that retaining heat during the engine-off event will increase the likelihood of the engine-off natural vacuum test executing successfully is based on a predicted route the vehicle will take between the engine-off event and a subsequent vehicle-off event. 9. The method of claim 8, where the predicted route is based on a predicted destination determined through machine learning. 10. A method for a vehicle, comprising: at a first vehicle-off event, determining a likelihood of a next vehicle-on event during a predetermined window;closing a canister vent valve at the first vehicle-off event if the determined likelihood is above a threshold; andmaintaining a status of a fuel system at the first vehicle-off event if the determined likelihood is below the threshold. 11. The method of claim 10, where the likelihood of a next vehicle-on event during a predetermined window is based on a predicted destination of the vehicle. 12. The method of claim 11, further comprising: opening the canister vent valve upon the next vehicle-on event;receiving an indication of the vehicle reaching the predicted destination;closing the canister vent valve at a subsequent vehicle-off event; andexecuting an engine-off natural vacuum test at the predicted destination. 13. The method of claim 10, further comprising: receiving an indication that retaining heat during the first vehicle-off event will increase a likelihood of a subsequent engine-off natural vacuum test executing successfully; andclosing the canister vent valve at the first vehicle-off event based on the received indication. 14. The method of claim 13, where the likelihood of a subsequent engine-off natural vacuum test executing successfully is based on a predicted route the vehicle will take between the first vehicle-off event and a subsequent vehicle-off event. 15. A method, comprising: during vehicle-on, engine-off operation where a hybrid vehicle is en route to a destination and responsive to an indication to perform an engine-off natural vacuum test at a subsequent vehicle-off event, closing a canister vent valve and maintaining a canister purge valve closed;responsive to vehicle-on, engine-on operation, opening the canister vent valve; andresponsive to the subsequent vehicle-off event, closing the canister vent valve and executing the engine-off natural vacuum test. 16. The method of claim 15, further comprising: receiving an indication that retaining heat will increase a likelihood of the engine-off natural vacuum test executing successfully; and thenclosing the canister vent valve prior to the vehicle-off event. 17. The method of claim 15, further comprising: receiving an indication of a fuel tank pressure increasing above a threshold while operating the hybrid vehicle in the vehicle-on, engine-off operation; and thenopening the canister vent valve.
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이 특허에 인용된 특허 (4)
Giacomazzi Roy A. (Rochester Hills MI) Rich Gregory E. (Richmond MI) Przeklas Chester W. (Mt. Clements MI) Turner Kenneth W. (Webster NY), Evaporative emission control system with vent valve.
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