US4393853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation type internal combustion engines and method of operating same
Assignee: Research Corp
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Filing: 1981-08-06
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Granted: 1983-07-19
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Expires: 2001-08-06
Abstract
Abstract A multi-cylinder internal combustion engine is disclosed in which a portion of the exhaust gas is selectively added to each cylinder. The exhaust gas is caused to swirl along the inside wall of the cylinder. Air or a fuel/air mixture is caused to swirl in a central zone in the cylinder in the same direction of swirl as the direction of swirl of the exhaust gas thereby providing a stratified exhaust gas recirculation design.
Inventors
- 👤 William N. Groves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:42
CPC Classifications
F; F02; F02B; F02B17/00; F02M; F02M26/00; F02M26/13; F02M26/17; F02M26/20; F02M26/40; F02M26/42; F02M26/52; F02M26/63; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
In a multi-cylinder internal combustion engine having a fuel and an air source connected to each cylinder via a substantially centrally located intake valve means in each cylinder; means for stratifying a combustible fuel/air mixture and exhaust gas in the cylinder during the intake stroke, said means for stratifying comprising: (a) fuel/air mixture swirling means for each cylinder; (b) at least one inlet port in each cylinder open to each cylinder from about 60° BBDC to about 60° ABDC; (c) conduit means connecting each said at least one inlet port with a source of pressurized exhaust gas; (d) said source of pressurized exhaust gas comprising the gas exhausting from the cylinder 360° apart on the firing order of the engine; (e) means for causing the exhaust gas to swirl in each cylinder in the same direction as the swirl of the air/fuel mixture.
Claim 2
Dependent Claim
143 words
In a multi-cylinder internal combustion engine having a fuel and an air source connected to each cylinder via a substantially centrally located intake valve means in each cylinder; means for stratifying a combustible fuel/air mixture and exhaust gas in the cylinder during the intake stroke, said means for stratifying comprising: (a) fuel/air mixture swirling means for each cylinder; (b) at least one inlet port in each cylinder open to each cylinder from about 60° BBDC to about 60° ABDC; (c) conduit means connecting each said at least one inlet port with a source of pressurized exhaust gas; (d) said source of pressurized exhaust gas comprising the gas exhausting from the cylinder 360° apart on the firing order of the engine; (e) means for causing the exhaust gas to swirl in each cylinder in the same direction as the swirl of the air/fuel mixture.
Claim 3
Dependent Claim
33 words
The internal combustion engine as defined in claim 1 wherein the exhaust gas swirls about the inner surface of the cylinder and the fuel/air mixture swirls in a central zone in the cylinder.
Claim 4
Dependent Claim
26 words
The internal combustion engine as defined in claim 2 further including tangential inlet means forming the at least one exhaust gas inlet port for each cylinder.
Claim 5
Dependent Claim
37 words
The internal combustion engine as defined in claim 3 further including a variable throttle valve means in each of the conduits connecting the at least one exhaust gas inlet port with the source of pressurized exhaust gas.
Claim 6
Dependent Claim
93 words
In a multi-cylinder internal combustion engine having a carburetor connected to each cylinder via a substantially centered intake valve means in each cylinder during the intake stroke said means for stratifying comprising: (a) fuel/air mixture swirling means upstream of the intake valve of each cylinder; (b) at least one tangential inlet port in each cylinder open to each cylinder from about 60° BBDC to about 60° ABDC; and (c) conduit means connecting each tangential inlet port with pressurized exhaust gas exhausting from the cylinder 360° apart on the firing order of the engine.
Claim 7
Dependent Claim
93 words
In a multi-cylinder internal combustion engine having a carburetor connected to each cylinder via a substantially centered intake valve means in each cylinder during the intake stroke said means for stratifying comprising: (a) fuel/air mixture swirling means upstream of the intake valve of each cylinder; (b) at least one tangential inlet port in each cylinder open to each cylinder from about 60° BBDC to about 60° ABDC; and (c) conduit means connecting each tangential inlet port with pressurized exhaust gas exhausting from the cylinder 360° apart on the firing order of the engine.
Claim 8
Independent Claim
97 words
A method of operating at least a two cylinder internal combustion engine comprising the steps: (a) directing in a swirling path air or a combustible fuel/air mixture into an engine cylinder during the intake stroke; (b) tangentially admitting in a swirling path exhaust gas exhausting from a cylinder 360° apart on the firing order of the engine, into the cylinder to provide a stratified charge of air or a fuel/air mixture and exhaust gas; (c) compressing the stratified charge; (d) igniting the stratified charge; (e) expanding the charge to produce useful work; and (f) exhausting the cylinder.
Claim 9
Independent Claim
97 words
A method of operating at least a two cylinder internal combustion engine comprising the steps: (a) directing in a swirling path air or a combustible fuel/air mixture into an engine cylinder during the intake stroke; (b) tangentially admitting in a swirling path exhaust gas exhausting from a cylinder 360° apart on the firing order of the engine, into the cylinder to provide a stratified charge of air or a fuel/air mixture and exhaust gas; (c) compressing the stratified charge; (d) igniting the stratified charge; (e) expanding the charge to produce useful work; and (f) exhausting the cylinder.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |