Dedicated EGR cylinder post combustion injection
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-025/07
F02D-019/12
출원번호
US-0915445
(2013-06-11)
등록번호
US-9534567
(2017-01-03)
발명자
/ 주소
Ulrey, Joseph Norman
Ervin, James Douglas
Boyer, Brad Alan
Styles, Daniel Joseph
McConville, Gregory Patrick
Ku, Kim Hwe
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
2인용 특허 :
30
초록▼
Systems and methods for increasing an amount of fuel injected into a dedicated exhaust gas recirculation (EGR) cylinder in an engine are disclosed. In one example approach, a method comprises, prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder, and after combustion and
Systems and methods for increasing an amount of fuel injected into a dedicated exhaust gas recirculation (EGR) cylinder in an engine are disclosed. In one example approach, a method comprises, prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder, and after combustion and during an expansion and/or exhaust stroke, directly injecting a second amount of fuel to the dedicated EGR cylinder.
대표청구항▼
1. A method for an engine, comprising: determining a cold start condition;if cold start conditions are determined not to be present: prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder; and after combustion and during an expansion and/or exhaust stroke directly injectin
1. A method for an engine, comprising: determining a cold start condition;if cold start conditions are determined not to be present: prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder; and after combustion and during an expansion and/or exhaust stroke directly injecting a second amount of fuel to the dedicated EGR cylinder; andif cold start conditions are determined to be present: prior to combustion, injecting a third amount of fuel to the dedicated EGR cylinder; after combustion and at or near exhaust valve opening, directly injecting a fourth amount of fuel to the dedicated EGR cylinder; and maintaining a pre-combustion air fuel ratio of the dedicated EGR cylinder lean during the cold start conditions. 2. The method of claim 1, wherein the engine is a spark-ignited engine. 3. The method of claim 1, further comprising maintaining a rich air fuel ratio in the dedicated EGR cylinder if cold start conditions are determined not to be present. 4. The method of claim 1, further comprising providing EGR from the dedicated EGR cylinder to an intake of the engine and, following directly injecting the second amount of fuel to the dedicated EGR cylinder, discontinuing providing EGR from the dedicated EGR cylinder to the intake. 5. The method of claim 1, further comprising providing EGR from the dedicated EGR cylinder to all of the cylinders or the remaining engine cylinders. 6. The method of claim 1, wherein, after injection of the second amount of fuel, a combustion air fuel ratio limit in the dedicated EGR cylinder is exceeded. 7. The method of claim 1, further comprising reducing an amount of fuel injected into the remaining cylinders after directly injecting the second amount of fuel to the dedicated EGR cylinder. 8. The method of claim 1, wherein an exhaust of the dedicated EGR cylinder is coupled to an intake of the engine. 9. The method of claim 1, wherein the third amount is less than the first amount. 10. A method for an engine, comprising: determining a cold start condition;during engine cold start conditions: prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder;after combustion and at or near exhaust valve opening, directly injecting a second amount of fuel to the dedicated EGR cylinder, the first and second injections during a common cylinder combustion cycle and repeatedly performed in successive cycles of the dedicated EGR cylinder; andmaintaining a pre-combustion air fuel ratio of the dedicated EGR cylinder lean during the cold start conditions; andfollowing the cold start conditions: prior to combustion, injecting a third amount of fuel to the dedicated EGR cylinder; after combustion and at or near exhaust valve opening, directly injecting a fourth amount of fuel to the dedicated EGR cylinder; andmaintaining a rich air fuel ratio in the dedicated EGR cylinder. 11. The method of claim 10, wherein the cold start conditions comprise an engine temperature less than a threshold temperature. 12. The method of claim 10, wherein the second amount of fuel is injected to the dedicated EGR cylinder during an expansion and/or exhaust stroke. 13. The method of claim 10, wherein the engine is a spark-ignited engine. 14. The method of claim 10, further comprising providing EGR from the dedicated EGR cylinder to all of the cylinders or the remaining engine cylinders. 15. The method of claim 10, wherein the third amount of fuel is greater than the first amount of fuel and wherein, after injection of the fourth amount of fuel, a combustion air fuel ratio limit in the dedicated EGR cylinder is exceeded. 16. A method for a spark-ignited engine, comprising: determining a cold start condition;during engine cold start conditions: prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder;after combustion and at or near exhaust valve opening, directly injecting a second amount of fuel to the dedicated EGR cylinder;maintaining an air fuel ratio of the dedicated EGR cylinder lean during the cold start conditions; andfollowing the cold start conditions: prior to combustion, injecting a third amount of fuel to the dedicated EGR cylinder;after combustion and at or near exhaust valve opening, directly injecting a fourth amount of fuel to the dedicated EGR cylinder; andmaintaining a rich air fuel ratio in the dedicated EGR cylinder. 17. The method of claim 16, wherein the cold start conditions comprise an engine temperature less than a threshold temperature. 18. The method of claim 16, wherein the second amount of fuel and the fourth amount of fuel are injected to the dedicated EGR cylinder during an expansion and/or an exhaust stroke. 19. A method, comprising: determining a cold start condition;responsive to a determination of cold start conditions when less than full EGR is desired; prior to combustion, injecting multiple fuel amounts to a dedicated EGR cylinder and maintaining a pre-combustion air fuel ratio of the dedicated EGR cylinder lean; andresponsive to a determination of no cold start, injecting multiple fuel amounts to the dedicated EGR cylinder and maintaining a post-combustion air fuel ratio in the dedicated EGR cylinder rich. 20. The method of claim 19, wherein the lean pre-combustion air fuel ratio includes burning fuel via a stratified charge injection during a compression stroke of the dedicated EGR cylinder.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (30)
Moore Jeffrey A. (La Crosse WI) Harmening Richard D. (Onalaska WI) Smiley ; III William A. (La Crosse WI) Xia Lunxi P. (La Crescent MN) Banta William T. (Nicholasville KY) Shen Fred T. (New York NY), Air handling unit with improved acoustical performance.
Boyer, Brad Alan; Curtis, Eric Warren; Ku, Kim Hwe; McConville, Gregory Patrick; Ervin, James Douglas; Styles, Daniel Joseph; Ulrey, Joseph Norman; Shelby, Michael Howard, Devices and methods for exhaust gas recirculation operation of an engine.
Hilditch, James Alfred; Shelby, Michael Howard; Czekala, Michael Damian; McConville, Gregory Patrick, Systems and methods for dedicated EGR cylinder exhaust gas temperature control.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.