Patent US3599426A successfully refreshed from Google Patents.
US3599426A
Expired / Lapsed
US
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Motor vehicle emission control system
Assignee: Sunoco Inc
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Filing: 1970-05-18
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Granted: 1971-08-17
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Expires: 1990-05-18
Abstract
Abstract Emission from motor vehicle exhausts of oxides of nitrogen, carbon monoxide, hydrocarbons, and aldehydes is reduced by a combination of enrichment, under off-idle operating conditions, of the fuel-air mixture fed to the engine, and an exhaust converter, e.g., a thermal exhaust reactor. The enrichment is brought about by a mechanical modification of the carburetor, and a selective carburetor control arrangement responsive to engine speed is utilized for enleanment of the fuel-air mixture at higher engine speeds.
Inventors
- 👤 Paul E Oberdorfer Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:23
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02M23/06; F02M23/062; F02M3/00; F02M3/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
System according to claim 1, wherein the automatic enleaning means acts to increase the air-to-fuel ratio of said mixture at the speeds and under the throttle conditions stated.
Claim 2
Dependent Claim
33 words
System of claim 1, wherein said engine utilizes a carburetor for feeding the fuel-air mixture to the engine intake, and wherein said enriching means and said enleaning means both operate upon said carburetor.
Claim 3
Dependent Claim
45 words
System defined in claim 3, wherein said enleaning means comprises actuatable means, separate from the main engine intake air supply, for supplying air to the engine intake, and means responsive to the speed of said engine or vehicle for actuating said separate air supplying means.
Claim 4
Dependent Claim
30 words
System recited in claim 1, wherein the last-mentioned means comprises a thermal reactor operating to burn at least a part of the carbon monoxide and hydrocarbons contained in said effluent.
Claim 5
Dependent Claim
42 words
System of claim 1, wherein the last-mentioned means comprises a thermal reactor with inlet connections and an outlet connection, means connecting the combustion chambers of the engine to said inlet connections, and means for connecting an exhaust pipe to said outlet connection.
Claim 6
Dependent Claim
86 words
For a motor vehicle internal combustion engine using a fossil fuel, a method for controlling exhaust emissions which comprises enriching the fuel-air mixture fed to the intake of said engine under off-idle and low-flow main metering operating conditions, thereby to reduce the emission from said engine of oxides of nitrogen, selectively and automatically varying the composition of the mixture at engine or vehicle speeds at or above a preselected speed and under nonclosed throttle conditions, and burning combustible gases present in the exhaust of said engine.
Claim 7
Dependent Claim
22 words
Method of claim 7, wherein the varying is effected selectively and automatically in response to the speed of said engine or vehicle.
Claim 8
Dependent Claim
12 words
Method of claim 7, wherein the varying comprises enleaning the fuel-air mixture.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |