Internal combustion engine having dedicated EGR cylinder(s) with intake separate from intake of main cylinders
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-047/08
F02M-025/07
출원번호
US-0741955
(2013-01-15)
등록번호
US-9206769
(2015-12-08)
발명자
/ 주소
Burrahm, Robert W
출원인 / 주소
SOUTHWEST RESEARCH INSTITUTE
대리인 / 주소
Livingston Law Firm
인용정보
피인용 횟수 :
7인용 특허 :
6
초록▼
A method and system for using an internal combustion engine with dedicated EGR cylinders to provide an adjustable EGR rate to the main (non dedicated) cylinders. The dedicated EGR cylinder(s) are configured to receive fresh air via a fresh air intake or to receive a portion of the mixture of fresh a
A method and system for using an internal combustion engine with dedicated EGR cylinders to provide an adjustable EGR rate to the main (non dedicated) cylinders. The dedicated EGR cylinder(s) are configured to receive fresh air via a fresh air intake or to receive a portion of the mixture of fresh air and EGR gas via the same mixed intake line that delivers intake to the main cylinders. If the dedicated EGR cylinder(s) receive only fresh air, the main cylinder(s) receive EGR at higher EGR rate. If the dedicated EGR cylinder(s) receive only the portion of fresh air and EGR gas, the main cylinder(s) receive EGR at a lower EGR rate. The EGR rate to the main cylinder(s) may be adjusted between these rates in response to operating conditions of the engine.
대표청구항▼
1. A method of using exhaust gas recirculation (EGR) to improve combustion efficiency of an internal combustion engine having a number of cylinders, comprising: operating one or more of the cylinders as dedicated EGR cylinder(s), such that all of its exhaust, during all or some engine cycles, may be
1. A method of using exhaust gas recirculation (EGR) to improve combustion efficiency of an internal combustion engine having a number of cylinders, comprising: operating one or more of the cylinders as dedicated EGR cylinder(s), such that all of its exhaust, during all or some engine cycles, may be recirculated via an EGR loop as EGR gas;operating all non dedicated EGR cylinder(s) as main cylinders that receive a mixture of fresh air and EGR gas via a mixed intake line and an intake manifold common to only the main cylinders;wherein the dedicated EGR cylinder(s) are configured to receive only fresh air via a fresh air intake line separate from the intake manifold to the dedicated EGR cylinder(s);wherein if the dedicated EGR cylinder(s) receive only fresh air, the main cylinder(s) receive EGR at a first EGR rate;wherein if the dedicated EGR cylinder(s) receive only the portion of EGR gas and fresh air, the main cylinder(s) receive EGR at a second EGR rate; andadjusting the rate of EGR gas received by the main cylinder(s) to the first EGR rate or to the second EGR rate in response to operating conditions of the engine. 2. The method of claim 1, wherein the dedicated EGR cylinder(s) has a single exhaust port that may open to the EGR loop. 3. The method of claim 1, wherein the dedicated EGR cylinder(s) has dual exhaust ports, one of which may open to the EGR loop and the other of which may open to the engine's main exhaust line. 4. The method of claim 1, wherein the engine's non dedicated EGR cylinder(s) are run stoichiometrically. 5. The method of claim 1, wherein the engine's non dedicated EGR cylinder(s) are run rich. 6. The method of claim 1, wherein the engine's non dedicated EGR cylinder(s) are run lean. 7. The method of claim 1, wherein the portion of EGR gas and fresh air is delivered to the dedicated EGR cylinder(s) via a passage downstream of a mixer in the intake to the main cylinders. 8. The method of claim 1, wherein the portion of EGR gas and fresh air is delivered to the dedicated EGR cylinder(s) via a passage from the EGR loop to the separate fresh air intake. 9. The method of claim 1, further comprising adjusting the EGR rate to the main cylinders to a rate between the first EGR rate and the second EGR rate. 10. The method of claim 9, wherein the adjusting is performed by adjusting the relative amount of fresh air and portion of the mixture of fresh air and EGR received by the dedicated EGR cylinder(s). 11. An exhaust gas recirculation (EGR) system for improved combustion efficiency of an internal combustion engine having a number of cylinders, comprising: one or more cylinders operable as dedicated EGR cylinder(s), such that all of its exhaust, during all or some engine cycles, may be recirculated via an EGR loop;one or more cylinders operable as main cylinders that receive EGR via the EGR loop;wherein the EGR loop is operable to recirculate EGR from the dedicated EGR cylinder(s) to an intake manifold of the main cylinders;a mixed input line for delivering a mixture of fresh air and EGR gas to the intake manifold of the main cylinders;a fresh air input line to the dedicated EGR cylinder(s);a passage between the mixed input line and the fresh air input line to the dedicated EGR cylinder(s), operable to deliver a portion of the mixture of fresh air and EGR to the dedicated EGR cylinder(s);wherein the dedicated EGR cylinder(s) may receive an intake comprising all fresh air or all the portion of the mixture or some proportion of both;a control unit programmed to perform the following tasks: receive data representing engine operating conditions, determine a desired EGR rate of EGR to be delivered to the main cylinders, and based on the desired EGR air, to control whether the dedicated EGR cylinder(s) receive all fresh air or all the mixture or some proportion of both. 12. The system of claim 11, wherein the dedicated EGR cylinder(s) has a single exhaust port that may open to the EGR loop. 13. The system of claim 11, wherein the dedicated EGR cylinder(s) has dual exhaust ports, one of which may open to the EGR loop and the other of which may open to an exhaust manifold of the main cylinders. 14. The system of claim 11, wherein the engine's non dedicated EGR cylinder(s) are run stoichiometrically. 15. The system of claim 11, wherein the engine's non dedicated EGR cylinder(s) are run lean. 16. The system of claim 11, wherein the engine's non dedicated EGR cylinder(s) are run rich. 17. The system of claim 11, further comprising a first valve on the passage line and a second valve on the fresh air line. 18. The system of claim 17, wherein the control unit is further programmed to control the first valve and the second valve such that the dedicated EGR cylinder(s) may receive proportions of fresh air and the mixture, and to adjust the proportions based on engine operating conditions.
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이 특허에 인용된 특허 (6)
Alger, II, Terrence Francis; Mangold, Barrett Wade; Gingrich, Jess Witman; Mehta, Darius, EGR system with dedicated EGR cylinders.
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