US3726084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for supercharging an internal combustion engine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1970-11-25
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Granted: 1973-04-10
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Expires: 1990-11-25
Abstract
Abstract An arrangement for supercharging an internal combustion engine with an improved pulse-turbocharging system wherein the exhaust pipes from the engine cylinders terminate in nozzles which are connected by way of a combining section with the inlet to a mixing tube, the outlet end from this tube being connected with the inlet to the supercharger. The preexhaust pressure waves from the cylinders are decomposed, during a gas change period, into a main pressure wave component and an auxiliary wave component, and the main and auxiliary pressure wave components are so modulated in the combining section that an admissible backpressure in the exhaust pipe of the respective scavenged cylinders is not exceeded.
Inventors
- 👤 E Meier
- 👤 G Zehnder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:22
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F02B37/00; F02B37/02; F02B75/22; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/027; F02B2075/1804; F02B2075/1824; F02B2075/184; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
Apparatus for supercharging an internal combustion engine having at least five working cylinders from the compressor component of a single turbo-supercharger, each said cylinder having an exhaust pipe correlated therewith, and wherein the turbine component of the supercharger driven by the exhaust gases from the engine cylinders functions in accordance with a pulse mode of operation, which comprises nozzles provided respectively at the outlet ends of said exhaust pipes, a combining section into which all of said nozzles terminate, said combining section serving to decompose inherently present pre-exhaust pressure waves from the cylinders into main and auxiliary pressure waves, and a mixing tube having one end thereof connected to the outlet from said combining section and the other end connected to the inlet of the turbine component of said supercharger, the minimum length of at least some of said exhaust pipes as measured in meters being equal to the quotient of triple the mean velocity of sound of the exhaust gases in meters/sec. divided by the nominal speed of the engine in revolutions/min.
Claim 2
Dependent Claim
173 words
Apparatus for supercharging an internal combustion engine having at least five working cylinders from the compressor component of a single turbo-supercharger, each said cylinder having an exhaust pipe correlated therewith, and wherein the turbine component of the supercharger driven by the exhaust gases from the engine cylinders functions in accordance with a pulse mode of operation, which comprises nozzles provided respectively at the outlet ends of said exhaust pipes, a combining section into which all of said nozzles terminate, said combining section serving to decompose inherently present pre-exhaust pressure waves from the cylinders into main and auxiliary pressure waves, and a mixing tube having one end thereof connected to the outlet from said combining section and the other end connected to the inlet of the turbine component of said supercharger, the minimum length of at least some of said exhaust pipes as measured in meters being equal to the quotient of triple the mean velocity of sound of the exhaust gases in meters/sec. divided by the nominal speed of the engine in revolutions/min.
Claim 3
Dependent Claim
64 words
Apparatus as defined in claim 1 for supercharging an internal combustion engine wherein some of said exhaust pipes are shorter than said minimum length and which further includes a reversing tube closed at one end and being provided with a nozzle at the opposite end terminating within said combining section, the length of said reversing tube being at least equal to said minimum length.
Claim 4
Dependent Claim
74 words
Apparatus as defined in claim 1 for supercharging an internal combustion engine wherein the nozzles at the outlet ends of said exhaust pipes are combined in a node, and the cross-sectional area of said mixing tube is at least equal to the difference between a 2.5 fold cross-sectional area at the narrowest point of an exhaust pipe nozzle less half the sum of the cross-sectional areas at the narrowest point of all other nozzles.
Claim 5
Dependent Claim
88 words
Apparatus as defined in claim 1 for supercharging an internal combustion engine wherein the ratio of the cross-section FM of said mixing tube to the effective flow cross-section FT of the turbine component of said supercharger lies between 1.7 : 1 and 1 : 1, and is determined by the equation: FM/FT (5 - k/2) . FE/FT wherein FM cross-sectional area of the mixing tube. FE cross-sectional area of the exhaust pipe nozzles at their narrowest point, and k number of exhaust pipes terminating within the combining section.
References Cited (Backward Citations)
GB319426A
Cited
GB352912A
Cited
US2542756A
Cited
US2649083A
Cited
US3064417A
Cited
US3077071A
Cited
US3153318A
Cited
US3298332A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |