Engine fuel control for internal combustion engine having dedicated EGR
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-047/08
F02M-025/07
G06F-007/00
G06F-017/00
F02D-041/00
F02D-041/40
F02M-026/43
F02M-026/05
F02M-026/35
출원번호
US-0173247
(2014-02-05)
등록번호
US-9650976
(2017-05-16)
발명자
/ 주소
Gingrich, Jess W.
Gukelberger, Raphael
Zuehl, Jacob R.
출원인 / 주소
SOUTHWEST RESEARCH INSTITUTE
대리인 / 주소
Livingston Law Firm
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A method of controlling the amount of fuel delivered to an engine having at least one dedicated EGR cylinder. The method is typically performed on an engine cycle-by-cycle basis. A fueling control unit receives, from the engine's main control unit, fueling requirement data representing a current fue
A method of controlling the amount of fuel delivered to an engine having at least one dedicated EGR cylinder. The method is typically performed on an engine cycle-by-cycle basis. A fueling control unit receives, from the engine's main control unit, fueling requirement data representing a current fueling requirement suitable for the main cylinders. The fueling control unit then calculates a current amount of fuel to be delivered to the dedicated EGR cylinder as a function of the number of dedicated EGR cylinders, the number of main cylinders, the current equivalence ratio for the dedicated EGR cylinder, and the fueling requirement data. With the amounts of fuel for both the dedicated EGR cylinder and the main cylinders now having been determined, the fueling control unit generates appropriate control signals to the cylinder fuel delivery mechanisms.
대표청구항▼
1. A method of controlling the amount of fuel delivered to an engine, the engine having at least one dedicated EGR cylinder with the remaining cylinders being main cylinders, each cylinder having at least one associated fuel injector, the engine further having an engine control unit: receiving, from
1. A method of controlling the amount of fuel delivered to an engine, the engine having at least one dedicated EGR cylinder with the remaining cylinders being main cylinders, each cylinder having at least one associated fuel injector, the engine further having an engine control unit: receiving, from the engine control unit, fueling requirement data representing a current fueling requirement amount for the main cylinders;calculating a current amount of fuel to be delivered to the at least one dedicated EGR cylinder as a product of a ratio that is a function of the number of dedicated EGR cylinders, the number of main cylinders, and the current equivalence ratio for the dedicated EGR cylinder, times the fueling requirement data;driving the fuel injector(s) associated with the at least one dedicated EGR cylinder by delivering a first set of control signals to the fuel injector(s) associated with the at least one dedicated EGR cylinder, the first set of control signals representing the current amount of fuel to be delivered to the at least one dedicated EGR cylinder;driving the fuel injectors associated with the main cylinders by delivering a second set of control signals to the fuel injectors of the main cylinders, the second set of control signals representing the fueling requirement data; andrepeating the above steps during operation of the engine. 2. The method of claim 1, wherein the fueling requirement data represents a pulse width for controlling a fuel injector. 3. The method of claim 1, wherein the calculating step is performed by calculating a mass flow value, and further comprising the step of correlating the fueling requirement data to mass flow data. 4. The method of claim 1, wherein the repeating step is performed for each engine cycle. 5. The method of claim 1, wherein the dedicated EGR cylinder is operated at a different equivalence ratio than the main cylinders. 6. The method of claim 1, wherein the engine's main cylinders are run stoichiometrically. 7. The method of claim 1, wherein the engine's main cylinders are run rich. 8. The method of claim 1, wherein the engine's main cylinders are run lean. 9. The method of claim 1, wherein the engine is a spark ignited engine. 10. The method of claim 1, wherein the engine is a compression ignited engine. 11. An exhaust gas recirculation (EGR) system for an internal combustion engine having a number of cylinders, each cylinder having at least one associated fuel injector, and further having an engine control unit, comprising: one or more cylinders operable as a dedicated EGR cylinder, such that all of the exhaust produced by EGR cylinder(s), during all or some engine cycles, may be recirculated to the engine's main (non dedicated) cylinders;an EGR loop for recirculating EGR from the dedicated EGR cylinder(s) to the engine's intake manifold;a control unit programmed to perform the following tasks: receiving, from the engine control unit, fueling requirement data representing a current fueling requirement for the main cylinders;calculating a current amount of fuel to be delivered to the dedicated EGR cylinder(s) as a product of a ratio that is function of the number of dedicated EGR cylinders, the number of main cylinders, and the current equivalence ratio for the dedicated EGR cylinder(s), times the fueling requirement data;driving the fuel injector(s) associated with the at least one dedicated EGR cylinder by delivering a first set of control signals to the fuel injector(s) associated with the dedicated EGR cylinder(s), the first set of control signals representing the current amount of fuel to be delivered to the dedicated EGR cylinder(s);driving the fuel injector(s) associated with the main cylinders by delivering a second set of control signals to the fuel injectors associated with the main cylinders, the second set of control signals representing the fueling requirement data; andrepeating the above steps during operation of the engine. 12. The system of claim 11, wherein the fueling requirement data represents a pulse width for controlling a fuel injector. 13. The system of claim 11, wherein the calculating step is performed by calculating a mass flow value, and further comprising the step of correlating the fueling requirement data to mass flow data. 14. The system of claim 11, wherein the repeating step is performed for each engine cycle. 15. The system of claim 11, wherein the dedicated EGR cylinder is operated at a different equivalence ratio than the main cylinders. 16. The system of claim 11, wherein the engine's main cylinders are run stoichiometrically. 17. The system of claim 11, wherein the engine's main cylinders are run rich. 18. The system of claim 11, wherein the engine's main cylinders are run lean. 19. The system of claim 11, wherein the engine is a spark ignited engine. 20. The system of claim 11, wherein the engine is a compression ignited engine.
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이 특허에 인용된 특허 (7)
Gingrich, Jess W.; Almaraz, Steven H., Integrated WGS/ECD exhaust treatment device for internal combustion engine having an EGR loop.
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