US3872845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EGR system built into carburetor
Assignee: Ford Motor Co
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Filing: 1972-12-05
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Granted: 1975-03-25
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Expires: 1992-12-05
Abstract
Abstract At least one channel is employed to directly communicate the exhaust manifold cross-over passages with the idle and low-speed fuel circuit for the carburetor of an internal combustion engine. Typical pressure conditions in the air horn of the carburetor draw in a combination of air/fuel and exhaust gases. The carburetor throttle and other carburetor controls function to regulate the degree of exhaust gas recirculation.
Inventors
- 👤 Thomas C Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:15
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/59; F02M26/60; F02M26/13; F02M26/17; F02M26/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
In an internal combustion engine having an inlet system for conducting an air/fuel mixture into said engine for combustion and having a throttle, an exhaust system for discharging the combustion products from said engine, and a fuel circuit means for adding fuel to said inlet system and having a fuel reservoir, the combination comprising: a. at least one port in said inlet system effective to function as part of said fuel circuit means, said port being located substantially adjacent said throttle so that said throttle controllably effects a suction at said port during flow through said inlet system. b. at least one opening in said exhaust system, c. means commonly communicating said opening, port and fuel reservoir at a location immediately adjacent said port whereby exhaust gases may be drawn into said inlet system premixed with fuel under the influence of vacuum operating at said port, for the purpose of continuous engine operation, said location being arranged so that at high suction levels fuel will be inducted therein through said pOrt to the exclusion of exhaust gases and at low suction levels exhaust gases will be siphoned into the port to the exclusion of fuel.
Claim 2
Dependent Claim
195 words
In an internal combustion engine having an inlet system for conducting an air/fuel mixture into said engine for combustion and having a throttle, an exhaust system for discharging the combustion products from said engine, and a fuel circuit means for adding fuel to said inlet system and having a fuel reservoir, the combination comprising: a. at least one port in said inlet system effective to function as part of said fuel circuit means, said port being located substantially adjacent said throttle so that said throttle controllably effects a suction at said port during flow through said inlet system. b. at least one opening in said exhaust system, c. means commonly communicating said opening, port and fuel reservoir at a location immediately adjacent said port whereby exhaust gases may be drawn into said inlet system premixed with fuel under the influence of vacuum operating at said port, for the purpose of continuous engine operation, said location being arranged so that at high suction levels fuel will be inducted therein through said pOrt to the exclusion of exhaust gases and at low suction levels exhaust gases will be siphoned into the port to the exclusion of fuel.
Claim 3
Dependent Claim
32 words
The combination as in claim 1, in which said common communicating means includes a restrictor effective to limit the maximum flow of exhaust gases to said inlet system to a predetermined level.
Claim 4
Dependent Claim
23 words
The combination as in claim 1, in which said communicating means has a limiting orifice for controlling the maximum flow of exhaust gases.
Claim 5
Dependent Claim
157 words
In an internal combustion engine having an exhaust system for discharging combustion products from said engine, a carburetor with an air horn defined by a wall and a throttle for inducting air and fuel into said engine for combustion, the combination comprising: a. at least one port in said wall adjacent the closed position of said throttle so that said throttle controllably effects a suction at said port during flow through said air horn, b. means defining an idle and low-speed fuel circuit for delivery of fuel to said port, and c. a passage disposed partly in the wall of said air horn communicating said exahust system with said port for providing exhaust gas recirculation, said port and passage being located so that at high suction levels fuel will be inducted into said port to the exclusion of exhaust gases and at low levels exhaust gases will be siphoned into the port to the exclusion of fuel.
Claim 6
Dependent Claim
157 words
In an internal combustion engine having an exhaust system for discharging combustion products from said engine, a carburetor with an air horn defined by a wall and a throttle for inducting air and fuel into said engine for combustion, the combination comprising: a. at least one port in said wall adjacent the closed position of said throttle so that said throttle controllably effects a suction at said port during flow through said air horn, b. means defining an idle and low-speed fuel circuit for delivery of fuel to said port, and c. a passage disposed partly in the wall of said air horn communicating said exahust system with said port for providing exhaust gas recirculation, said port and passage being located so that at high suction levels fuel will be inducted into said port to the exclusion of exhaust gases and at low levels exhaust gases will be siphoned into the port to the exclusion of fuel.
Claim 7
Dependent Claim
28 words
The combination as in claim 4, in which two ports are disposed in the wall of said air horn each adjacent said throttle, one below and one above.
Claim 8
Dependent Claim
26 words
The combination as in claim 5, in which said port above said throttle is formed as a slot aligned with the length of said air horn.
Claim 9
Dependent Claim
158 words
In an internal combustion engine having an exhaust system for discharging combustion products from said engine, a carburetor with an air horn defined by a wall and a throttle for inducting air and fuel into said engine for combustion, said exhaust system having an exhaust manifold beneath said carburetor, the combination comprising: a. at least one port in said wall adjacent the closed position of said throttle b. means defining an idle and low-speed fuel circuit for delivery of fuel to said port, c. a spacer disposed between said carburetor and manifold having an opening for extending said air horn, and d. a passage disposed partly in the wall of said air horn communicating said exhaust system with said port for providing exhaust gas recirculation and a passage portion in each of said spacer and manifold forming the remainder of said communicating passage, one of said passage portions having an orifice for limiting the maximum exhaust gas recirculation.
Claim 10
Dependent Claim
158 words
In an internal combustion engine having an exhaust system for discharging combustion products from said engine, a carburetor with an air horn defined by a wall and a throttle for inducting air and fuel into said engine for combustion, said exhaust system having an exhaust manifold beneath said carburetor, the combination comprising: a. at least one port in said wall adjacent the closed position of said throttle b. means defining an idle and low-speed fuel circuit for delivery of fuel to said port, c. a spacer disposed between said carburetor and manifold having an opening for extending said air horn, and d. a passage disposed partly in the wall of said air horn communicating said exhaust system with said port for providing exhaust gas recirculation and a passage portion in each of said spacer and manifold forming the remainder of said communicating passage, one of said passage portions having an orifice for limiting the maximum exhaust gas recirculation.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |