US4051824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine for motor vehicles
Assignee: Subaru Corp
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Filing: 1975-11-24
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Granted: 1977-10-04
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Expires: 1995-11-24
Abstract
Abstract An internal combustion engine has an exhaust gas recirculation system to recirculate a portion of exhaust gases into an induction passage downstream of a throttle valve under the control of a valve device that is actuated by a vacuum in the induction passage and has a carburetor including a manifold vacuum responsive enriching system. The engine also has means detecting conditions where recirculation of exhaust gases is effected and valve means for controlling vacuum applied to a servo in the enriching system to render the enriching system in its operative condition. The enriching system may include a conventional power piston device which increases fuel flow during high power demanded conditions or a conventional air fuel mixture circuit system which supplies air fuel mixture to the induction passage downstream of the throttle valve during periods of deceleration.
Inventors
- 👤 Katsuhiko Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:46
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M7/00; F02M7/12; F02M7/133; F02M2026/001; F02M2026/009
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
320 words
An internal combustion engine, comprising, an induction passage, a venturi formed in said induction passage, a throttle valve rotatably disposed in said induction passage for controlling the quantity of air-fuel mixture flow therethrough, a fuel reservoir, means for supplying fuel to said induction passage in accordance with the quantity of air flow through said induction passage, means for supplying additional fuel to said induction passage, said means for supplying additional fuel comprising an additional fuel valve means for controlling the additional fuel and a vacuum means for operating said additional fuel valve means, an exhaust passage communicating with said induction passage, passage means for recirculating a part of exhaust gases from said exhaust passage into said induction passage at the downstream of said throttle valve, a first valve means for controlling recirculation of exhaust gases through said recirculating passage means, a vacuum conduit communicating said first valve means with an atmospheric side of said throttle valve in said induction passage, said first valve means including a servo means operatively connected to said induction passage at a location positioned on the atmospheric side of and adjacent to said throttle valve when said throttle valve is closed in idle position through said vacuum conduit, a spring normally biasing said first valve means for blocking flow of exhaust gases through said recirculating passage means, said first valve means for being acted on by vacuum in said induction passage against said spring to permit the flow of exhaust gases through said recirculating passage means, a first conduit for operatively connecting said vacuum means with said induction passage downstream of said throttle valve, means for controlling the vacuum applied to said vacuum means through said first conduit, said means for controlling the vacuum including a solenoid valve means adapted for actuation simultaneously with actuation of said first valve means for controlling the vacuum applied to said vacuum means for the supply of the additional fuel.
Claim 2
Dependent Claim
320 words
An internal combustion engine, comprising, an induction passage, a venturi formed in said induction passage, a throttle valve rotatably disposed in said induction passage for controlling the quantity of air-fuel mixture flow therethrough, a fuel reservoir, means for supplying fuel to said induction passage in accordance with the quantity of air flow through said induction passage, means for supplying additional fuel to said induction passage, said means for supplying additional fuel comprising an additional fuel valve means for controlling the additional fuel and a vacuum means for operating said additional fuel valve means, an exhaust passage communicating with said induction passage, passage means for recirculating a part of exhaust gases from said exhaust passage into said induction passage at the downstream of said throttle valve, a first valve means for controlling recirculation of exhaust gases through said recirculating passage means, a vacuum conduit communicating said first valve means with an atmospheric side of said throttle valve in said induction passage, said first valve means including a servo means operatively connected to said induction passage at a location positioned on the atmospheric side of and adjacent to said throttle valve when said throttle valve is closed in idle position through said vacuum conduit, a spring normally biasing said first valve means for blocking flow of exhaust gases through said recirculating passage means, said first valve means for being acted on by vacuum in said induction passage against said spring to permit the flow of exhaust gases through said recirculating passage means, a first conduit for operatively connecting said vacuum means with said induction passage downstream of said throttle valve, means for controlling the vacuum applied to said vacuum means through said first conduit, said means for controlling the vacuum including a solenoid valve means adapted for actuation simultaneously with actuation of said first valve means for controlling the vacuum applied to said vacuum means for the supply of the additional fuel.
Claim 3
Dependent Claim
44 words
An internal combustion engine as claimed in claim 1, in which said servo means for vacuum force biasing said first valve means against said spring for overcoming the force of said spring when vacuum in said vacuum conduit is higher than a predetermined value.
Claim 4
Dependent Claim
72 words
An internal combustion engine as claimed in claim 1, in which said means for supplying additional fuel includes a power piston means, constituting said vacuum means, for increasing the quantity of fuel flow during high power demanded operating conditions and said first conduit operatively connecting said power piston means with said induction passage downstream of said throttle valve to maintain said power piston means in an inoperative condition during normal engine operation.
Claim 5
Dependent Claim
93 words
An internal combustion engine as claimed in claim 1, wherein said means for controlling the vacuum and said solenoid valve means are constructed as one unit, the latter includes a second valve means fluidly disposed in said first conduit, and said second valve means is movable between a first position to vent said first conduit and a second position to permit said first conduit to communicate with said induction passage, and said solenoid valve means is for moving said second valve means to the first position when said first valve means is actuated.
Claim 6
Dependent Claim
78 words
An internal combustion engine as claimed in claim 1, wherein said means for supplying additional fuel includes means for supplying fuel with induced air to said induction passage downstream of said throttle valve during deceleration operating conditions, conduit means connecting said fuel with induced air-supplying means with said induction passage downstream of said throttle valve, and said additional fuel valve means is disposed in said conduit means for controlling the supply of the additional fuel with induced air.
Claim 7
Dependent Claim
60 words
An internal combustion engine as claimed in claim 1, wherein said means for controlling the vacuum includes a vacuum valve means, the latter and said solenoid valve means are connected in parallel in said first conduit, and said solenoid valve means is moveable between a first position to close passage therethrough and a second position to open passage therethrough, respectively.
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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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |