US3702111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric pollution control arrangement for internal combustion engine
Assignee: BLMC Ltd
•
Filing: 1971-02-19
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Granted: 1972-11-07
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Expires: 1991-02-19
Abstract
Abstract A multi-cylinder internal combustion engine having a valve in addition to normal inlet and exhaust valves in the cylinders of the engine through which part of the gaseous products of combustion are removable, before they have passed through the exhaust system of the engine and are re-introduced into another cylinder of the engine after closure of the inlet valve thereof. The additional valves of the cylinders are interconnected in pairs by manifolds to permit this recirculation of exhaust gases. By recirculating part of the exhaust gases from each cylinder in this way the proportion of oxides of nitrogen in the final exhaust gases from the engine is reduced.
Inventors
- 👤 John Harold Weaving
- 👤 Cecil David Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/0276; F02B; F02B47/00; F02B47/04; F02B47/08; F02M; F02M26/00; F02M26/13; F02M26/17; F02M26/20; F02M26/37; F02M26/42; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
An internal combustion engine comprising at least two cylinders having inlet and exhaust valve means also including additional valve means through which part of the gaseous products of combustion are removable, before they have passed through the exhaust system of the engine, said additional valve means being openable during the power stroke of the engine before said exhaust valve means opens whereby gaseous products of combustion extracted through the additional valve means will have a pressure substantially greater than atmospheric pressure, and means for re-introducing the gaseous products of combustion extracted through the additional valve means into one of said cylinders at a pressure substantially greater than atmospheric pressure after closure of the inlet valve means thereof whereby a lower combustion temperature will be obtained thereby reducing the quantity of oxides of nitrogen in the gaseous products of combustion.
Claim 2
Dependent Claim
139 words
An internal combustion engine comprising at least two cylinders having inlet and exhaust valve means also including additional valve means through which part of the gaseous products of combustion are removable, before they have passed through the exhaust system of the engine, said additional valve means being openable during the power stroke of the engine before said exhaust valve means opens whereby gaseous products of combustion extracted through the additional valve means will have a pressure substantially greater than atmospheric pressure, and means for re-introducing the gaseous products of combustion extracted through the additional valve means into one of said cylinders at a pressure substantially greater than atmospheric pressure after closure of the inlet valve means thereof whereby a lower combustion temperature will be obtained thereby reducing the quantity of oxides of nitrogen in the gaseous products of combustion.
Claim 3
Dependent Claim
134 words
An engine as claimed in claim 1 in which each cylinder includes said additional valve means through which part of the gaseous products of combustion are removable before they have passed through the exhaust system of the engine, the engine also including duct means interconnecting the cylinders in pairs for re-introducing the gaseous products of combustion extracted through the additional valve means of one cylinder of an interconnected pair into the other cylinder of the interconnected pair after closure of the inlet valve means and before the next opening of the exhaust valve means of said other cylinder and actuating means for opening and closing the additional valve means of the respective cylinders in timed relationship to the opening and closing of the inlet and exhaust valve means of the cylinders of interconnected pairs.
Claim 4
Dependent Claim
30 words
An engine as claimed in claim 2 in which said additional valve means in each cylinder comprises a poppet valve and a cam-shaft for opening and closing said poppet valves.
Claim 5
Dependent Claim
44 words
An engine as claimed in claim 3 having a cam-shaft for controlling the opening and closing of inlet and exhaust valves of the engine in which the latter cam-shaft is also employed to open and close the poppet valve comprising said additional valve means.
References Cited (Backward Citations)
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Cited
US1597917A
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US1833802A
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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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |