US3730156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recycling
Assignee: Old Carco LLC
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Filing: 1971-11-24
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Granted: 1973-05-01
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Expires: 1991-11-24
Abstract
Abstract An automobile engine recycles a fraction of its exhaust gases by means of a restricted bypass duct discharging into the fuel-air inlet conduit at the diffuser region of the customary fuel inducing venturi restriction. The recycled exhaust gas flow is modulated by the pressure differential across a metering restriction between the exhaust gas source and the venturi restriction. A supplemental control valve responsive to the pressure differential between the venturi restriction and a control port, which opens into the inlet conduit immediately above the leading edge of a conventional butterfly type throttle valve, is employed in the bypass duct to close or restrict the latter when the throttle valve is at either its idle or wide open position. The source of exhaust gas for recycling may comprise comparatively cool exhaust gases collected in a dead-end sound attenuating chamber of the exhaust muffler, which chamber is in communication with the hot exhaust gases in the muffler but is out of the direct exhaust flow path, such that lead contaminants in the exhaust gases cool and solidify in the chamber as minute particles that readily flow through the metering restriction in the bypass duct.
Inventors
- 👤 J Sarto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:49
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/63; F02M26/13; F02M26/17; F02M26/19; F02M26/55; F02M26/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
242 words
In an internal combustion engine, A. an inlet circuit for conducting a fuel-air mixture into said engine for combustion therein and having a venturi restriction, B. a throttle valve downstream of said venturi restriction and movable between idle and open positions, C. a control port opening into said inlet conduit at a region whereat the fluid pressure is reduced upon part opening of said throttle valve from said idle position, D. an exhaust conduit for discharging hot exhaust gases from said engine, E. means for effectively inhibiting the formation of nitrogen oxides during said combustion by recirculating exhaust gases into said inlet conduit to limit the temperature of said combustion comprising bypass duct means having a metering restriction, F. said bypass duct means having one end opening into said exhaust conduit to receive exhaust gases therefrom and having a second end opening into said inlet conduit at the region of said venturi restriction to modulate the flow of exhaust gases into said inlet conduit as a function of the fluid pressure at said venturi restriction and at said one end, G. bypass valve means normally closing said bypass duct means, said bypass valve means being responsive to the reduced fluid pressure at said control port for opening said bypass duct means upon part opening of said throttle valve and being responsive to said fluid pressure at said venturi restriction to close said bypass duct means upon wide opening of said throttle valve.
Claim 2
Dependent Claim
242 words
In an internal combustion engine, A. an inlet circuit for conducting a fuel-air mixture into said engine for combustion therein and having a venturi restriction, B. a throttle valve downstream of said venturi restriction and movable between idle and open positions, C. a control port opening into said inlet conduit at a region whereat the fluid pressure is reduced upon part opening of said throttle valve from said idle position, D. an exhaust conduit for discharging hot exhaust gases from said engine, E. means for effectively inhibiting the formation of nitrogen oxides during said combustion by recirculating exhaust gases into said inlet conduit to limit the temperature of said combustion comprising bypass duct means having a metering restriction, F. said bypass duct means having one end opening into said exhaust conduit to receive exhaust gases therefrom and having a second end opening into said inlet conduit at the region of said venturi restriction to modulate the flow of exhaust gases into said inlet conduit as a function of the fluid pressure at said venturi restriction and at said one end, G. bypass valve means normally closing said bypass duct means, said bypass valve means being responsive to the reduced fluid pressure at said control port for opening said bypass duct means upon part opening of said throttle valve and being responsive to said fluid pressure at said venturi restriction to close said bypass duct means upon wide opening of said throttle valve.
Claim 3
Dependent Claim
66 words
In the combination according to claim 1, cooling means upstream of said metering restriction for cooling said exhaust gases in said bypass duct means sufficiently to solidify a major portion of lead contaminants therein, said bypass duct means downstream of said cooling means being arranged to conduct the cooled exhaust gases through said metering restriction and into said inlet conduit at temperatures between 200*F and 700*F.
Claim 4
Dependent Claim
74 words
In the combination according to claim 1, said bypass valve means comprising pressure actuated means having one portion responsive to the fluid pressure at said control port for actuation thereby and having another portion responsive to the fluid pressure at said venturi restriction and also in communication with said bypass duct means downstream of said metering restriction, and movable means responsive to actuation of said diaphragm for opening and closing said bypass duct means.
Claim 5
Dependent Claim
37 words
In the combination according to claim 3, said throttle valve comprising a blade type valve pivotal in said inlet conduit and having an upstream edge, said control port opening into said inlet conduit adjacent said upstream edge.
Claim 6
Dependent Claim
135 words
In the combination according to claim 1, said bypass valve means having a movable member shiftable for opening and closing said bypass duct means, biasing means for normally urging said member to close said bypass duct means when said throttle valve is at said idle position, and pressure actuated means operably coupled with said member to shift the same, said pressure actuated means having one portion in communication with said control port and responsive to the reduced fluid pressure thereat when said throttle valve is partly open to shift said member to open said bypass duct means, said pressure actuated means having a second portion in communication with said venturi restriction and responsive to the fluid pressure thereat when Said throttle valve is wide open to shift said member to close said bypass duct means.
Claim 7
Dependent Claim
30 words
In the combination according to claim 5, said second portion and said bypass duct means downstream of said metering restriction having the same means for communicating with said venturi restriction.
Claim 8
Dependent Claim
34 words
In the combination according to claim 6, cooling means upstream of said metering restriction for cooling said exhaust gases in said bypass conduit means sufficiently to solidify a major portion of lead contaminants therein.
Claim 9
Dependent Claim
110 words
In the combination according to claim 6, said throttle valve comprising a throttle blade pivotal within said inlet conduit at a location downstream of said venturi restriction and having a leading edge movable in an upstream direction upon opening movement of said throttle blade from its idle position, said control port opening into said inlet conduit adjacent said leading edge and within a high pressure region of said inlet conduit when said throttle blade is at its idle position, said leading edge being movable upstream of said control port to effect said reduced pressure thereat throughout a limited range of opening movement of said throttle blade from said idle position.
Claim 10
Dependent Claim
23 words
In the combination according to claim 8, said metering restriction having a predetermined fixed dimension and being located upstream of said shiftable member.
Claim 11
Dependent Claim
30 words
In the combination according to claim 9, means upstream of said metering restriction for cooling said exhaust gases in said bypass conduit means to a temperature between 550*F and 700*F.
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |