US3703164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric pollution control arrangement for internal combustion engine
Assignee: BLMC Ltd
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Filing: 1971-02-19
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Granted: 1972-11-21
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Expires: 1991-02-19
Abstract
Abstract An 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 by which the gaseous products of combustion extracted through the additional valves are re-introduced into each cylinder of the engine after closure of the inlet valve thereof. By recirculating part of the exhaust gases from the cylinders in this way, the proportion of oxides of nitrogen in the final exhaust gases from the engine is reduced.
Inventors
- 👤 John Harold Weaving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:23
CPC Classifications
F; F02; F02B; F02B47/00; F02B47/04; F02B47/08; F02M; F02M26/00; F02M26/13; F02M26/17; F02M26/20; F02M26/34; F02M26/41; F02M26/22; F02M26/23; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
168 words
An internal combustion engine comprising at least one cylinder having inlet valve means arranged to close after bottom dead center during the induction stroke of the engine, and exhaust valve means arranged to open well before bottom dead center during the power stroke of the engine, 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 the cylinder 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
168 words
An internal combustion engine comprising at least one cylinder having inlet valve means arranged to close after bottom dead center during the induction stroke of the engine, and exhaust valve means arranged to open well before bottom dead center during the power stroke of the engine, 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 the cylinder 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
168 words
An internal combustion engine comprising at least one cylinder having inlet valve means arranged to close after bottom dead center during the induction stroke of the engine, and exhaust valve means arranged to open well before bottom dead center during the power stroke of the engine, 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 the cylinder 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 4
Dependent Claim
168 words
An internal combustion engine comprising at least one cylinder having inlet valve means arranged to close after bottom dead center during the induction stroke of the engine, and exhaust valve means arranged to open well before bottom dead center during the power stroke of the engine, 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 the cylinder 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 5
Dependent Claim
64 words
An engine as claimed in claim 1 in which said cylinder includes said additional valve means, the latter being opened during part of the time the exhaust valve means of the relevant cylinder is open, whereby part of the gaseous products of combustion will be removed from the cylinder for re-introduction into the cylinder instead of passing through the exhaust system of the engine.
Claim 6
Dependent Claim
53 words
An engine as claimed in claim 1 in which said cylinder is associated with a receiver chamber for the part of the gaseous products of combustion removed through the additional valve means, the latter also controlling the introduction of said part of the gaseous products into and out of the relevant receiver chamber.
Claim 7
Dependent Claim
21 words
An engine as claimed in claim 3 in which said receiver chamber is formed in the head of the relevant cylinder.
Claim 8
Dependent Claim
78 words
An engine as claimed in claim 1 and having a single cylinder in which the additional valve means comprises a branch duct leading from the exhaust system of the engine downstream of the exhaust valve means of the cylinder to the cylinder a non-return valve in said branch duct, permitting flow only in the direction from the exhaust system to the cylinder and a compressor for increasing the pressure of the exhaust gases diverted through the branch duct.
Claim 9
Dependent Claim
149 words
An engine as claimed in claim 1 and having at least two cylinders in which said additional valve means and said means for re-introducing the extracted gaseous products of combustion comprise a branch duct common to all cylinders of the engine and leading from the exhaust system of the engine downstream of the exhaust valve means in said cylinders, a distributing valve connected to the downstream end of said branch duct, a plurality of distributing ducts from said distributing valve to each said cylinder, non-return valve in each distributing duct, permitting flow only in the direction from the exhaust system to the cylinder, to each cylinder in turn in timed relationship to the opening and closing of the inlet valve means of that cylinder, and a compressor in said branch duct upstream of said distributing valve for increasing the pressure of the exhaust gases diverted through said branch duct.
Claim 10
Dependent Claim
27 words
An engine as claimed in claim 1 in which said additional valve means comprises a poppet valve and a cam-shaft for opening and closing said poppet valve.
Claim 11
Dependent Claim
44 words
An engine as claimed in claim 7 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.
Claim 12
Dependent Claim
127 words
An internal combustion engine comprising at least one cylinder 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, and meAns for reintroducing the gaseous products of combustion extracted through the additional valve means into the cylinder after closure of the inlet valve means thereof, a branch duct leading from the exhaust system of the engine downstream of the exhaust valve means of the cylinder to the cylinder, a non-return valve in said branch duct, permitting flow only in the direction from the exhaust system to the cylinder and a compressor for increasing the pressure of the exhaust gases diverted through the branch duct.
Claim 13
Dependent Claim
127 words
An internal combustion engine comprising at least one cylinder 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, and meAns for reintroducing the gaseous products of combustion extracted through the additional valve means into the cylinder after closure of the inlet valve means thereof, a branch duct leading from the exhaust system of the engine downstream of the exhaust valve means of the cylinder to the cylinder, a non-return valve in said branch duct, permitting flow only in the direction from the exhaust system to the cylinder and a compressor for increasing the pressure of the exhaust gases diverted through the branch duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |