IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0548559
(1990-07-05)
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우선권정보 |
GB-19890015352 (1989-07-04) |
발명자
/ 주소 |
- Welch, Alan B.
- Skinner, Raymond C. D.
- Goetz, Wendelin A.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
25 인용 특허 :
8 |
초록
▼
A dual fuel, natural gas/diesel two-stroke engine includes a cylinder and a piston in the cylinder, and inlet ports around the cylinder which are uncovered by downward movement of the piston. A blower forces air through the inlet ports when the latter is uncovered, and the engine includes an exhaust
A dual fuel, natural gas/diesel two-stroke engine includes a cylinder and a piston in the cylinder, and inlet ports around the cylinder which are uncovered by downward movement of the piston. A blower forces air through the inlet ports when the latter is uncovered, and the engine includes an exhaust port and valve for exhausting combustion gases once each cycle. Diesel injection takes place near top dead center to ignite the gaseous mixture. An injector is provided for injecting natural gas into the cylinder once each cycle, including a delivery conduit which opens into the cylinder at a location above the inlet ports for air, such that the piston when descending completely uncovers the conduit before beginning to uncover the air inlet ports.
대표청구항
▼
1. In a dual fuel, natural gas/diesel two-stroke engine having at least one cylinder, a piston in the cylinder, inlet port means around the cylinder to be uncovered by downward movement of the piston in the cylinder, air means for forcing air through said inlet port means when uncovered, an exhaust
1. In a dual fuel, natural gas/diesel two-stroke engine having at least one cylinder, a piston in the cylinder, inlet port means around the cylinder to be uncovered by downward movement of the piston in the cylinder, air means for forcing air through said inlet port means when uncovered, an exhaust port and valve means for opening said exhaust port once each cycle to exhaust combustion gases from said cylinder, diesel injection means to inject diesel fuel into the cylinder once each cycle, and gas injection means for injecting natural gas into the cylinder once each cycle, the improvement according to which the gas injection means includes a delivery conduit for natural gas, which conduit opens into the cylinder at a location above said inlet port means, whereby the piston when descending completely uncovers said conduit before beginning to uncover said inlet port means. 2. A duel fuel, natural gas/diesel two stroke engine comprising: at least one cylinder, a piston in the cylinder, inlet port means around the cylinder to be uncovered by downward movement of the piston in the cylinder, air means for forcing air through said inlet port means when uncovered, an exhaust port and valve means for opening said exhaust port once each cycle to exhaust combustion gases from said cylinder, diesel injection means to inject diesel fuel into the cylinder once each cycle, and gas injection means for injecting natural gas into the cylinder once each cycle, said gas injection means including a delivery conduit for natural gas, which conduit opens into the cylinder at a location above said inlet port means, whereby the piston when descending completely uncovers said conduit before beginning to uncover said inlet port means. 3. The invention claimed in claim 1, in which said gas injection means includes electronic control means arranged to initiate gas injection early enough that the injection begins at or just after bottom dead center, and is completed a) before said piston covers the conduit on the upstroke, but b) after the piston covers the inlet port means on the upstroke. 4. The invention claimed in claim 2, in which said gas injection means includes electronic control means arranged to initiate gas injection early enough that the injection begins at or just after bottom dead center, and is completed a) before said piston covers the conduit on the upstroke, but b) after the piston covers the inlet port means on the upstroke. 5. The invention claimed in claim 3, in which said engine further has cooling means for cooling air prior to its injection into the cylinder. 6. A method of operating a dual fuel, natural gas/diesel two stroke engine, the engine comprising: at least one cylinder, a piston in the cylinder, inlet port means around the cylinder positioned to be uncovered by downward movement of the piston in the cylinder, air means for forcing air through said inlet port means when uncovered, an exhaust port and valve means for opening said exhaust port once each cycle to exhaust combustion gases from said cylinder, diesel injection means to inject diesel fuel into the cylinder once each cycle, and gas injection means for injecting natural gas into the cylinder once each cycle, said gas injection means including a delivery conduit for natural gas, which conduit opens into the cylinder at a location above said inlet port means, whereby the piston when descending completely uncovers said conduit before beginning to uncover said inlet port means; said method comprising the steps: a) as the piston approaches top dead center, injecting diesel fuel into the cylinder to initiate combustion of an ignitable gaseous mixture previously placed in the cylinder, b) as the piston descends on the power stroke, beginning the opening of the exhaust port and initiating exhaust prior to the point where the descending piston uncovers the said conduit, c) uncovering the conduit due to the further descent of the piston, d) after the descending piston has uncovered said inlet port means, forcing air into the cylinder, e) after the descending piston has passed bottom dead centre initiating injection of natural gas into the cylinder, f) after the ascending piston covers inlet port means, ceasing the forcing of air into the cylinder, g) closing the exhaust port, as the piston closes the inlet port means, h) halting the injection of natural gas before the ascending piston covers said conduit, but after the piston has closed said inlet port means, i) closing the said conduit after halting the injection of natural gas, and retracing steps a) through i). 7. The method claimed in claim 6, in which scavenging of combustion products through the exhaust port is completed prior to the end of natural gas injection. 8. The method claimed in claim 6, in which, as load on the engine increases, the initiation of natural gas injection is advanced, while the termination of the natural gas injection remains substantially unchanged. 9. The method claimed in claim 7, in which, as load on the engine increases, the initiation of natural gas injection is advanced, while the termination of natural gas injection remains substantially unchanged. 10. The invention claimed in claim 1, in which the air means includes further means for cooling the air passing into the cylinder. 11. The invention claimed in claim 2, in which the air means includes further means for cooling the air passing into the cylinder. 12. The method claimed in claim 6, in which step d) includes cooling the air being forced into the cylinder.
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