Boots – shoes – and leggings
Patent
1989-09-15
1991-09-24
Lall, Parshotam S.
Boots, shoes, and leggings
60278, 123 65R, 123 65E, 123 73C, F02M 4900
Patent
active
050519093
ABSTRACT:
A method and means are described for determining the average backpressure at a cylinder exhaust port in a crankcase scavenged two-cycle engine. The exhaust backpressure is determined by averaging the pressure of air within a crankcase chamber associated with the cylinder, during a portion of the engine operating cycle when the cylinder inlet and exhaust ports are simultaneously open. The overlap interval in port openings creates a channel for airflow between the crankcase chamber and the cylinder exhaust port, and except for an initial portion of the interval assocated with the pressure equalization between the cylinder and its crankcase chamber, the crankcase pressure substantially equals the backpressure appearing at the cylinder exhaust port. In the preferred embodiment of the invention, a pressure sensor is disposed within the crankcase chamber to sample air pressure at specified engine rotational positions during the overlap interval. These samples are then numerically averaged to obtain the average exhaust backpressure, which is used for compensating the amount of air inducted per cylinder per engine cycle to determined the amount of air per cylinder trapped and available for combustion within the engine. The control of the engine is thereby automatically corrected to account for changes in the engine exhaust system, the altitude of engine operation, and local barometric pressure.
REFERENCES:
patent: 3190271 (1965-06-01), Gudmundsen
patent: 3875744 (1975-04-01), Brooks et al.
patent: 4064693 (1977-12-01), Shibata
patent: 4185598 (1980-01-01), Onishi
patent: 4302814 (1981-11-01), Full et al.
patent: 4446833 (1984-05-01), Matsushita et al.
patent: 4461260 (1984-07-01), Nonaka et al.
patent: 4750464 (1988-06-01), Staerzl
patent: 4901701 (1990-02-01), Chasteen
Gomez Aparicio J.
Montville Dennis W.
Trombley Douglas E.
Cosimano Edward R.
Funke Jimmy L.
General Motors Corporation
Lall Parshotam S.
LandOfFree
Method and means for determining exhaust backpressure in a crank does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and means for determining exhaust backpressure in a crank, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and means for determining exhaust backpressure in a crank will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1701950