US4479478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the recirculation of exhaust gases in internal combustion engines
Assignee: Renault SA
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Filing: 1983-10-11
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Granted: 1984-10-30
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Expires: 2003-10-11
Abstract
Abstract A device is disclosed for controlling the recirculation of exhaust gas for an internal combustion engine 1 in which an air-fuel mixture intake pipe 2 and an exhaust pipe 3 are connected with each other by a recirculation circuit having a main valve 4 and connecting pipes 5 and 6. This valve 4 is controlled by the partial vacuum prevailing at the venturi V of the intake pipe 2 by a solenoid valve 14. According to the invention, this control device includes a control system 13 having an additive type pneumatic amplifier 17 that generates a partial vacuum signal for the control of this main valve 4 whose strength is greater than the value of partial vacuum at the nozzle 16 of the venturi throat V, with a constant value in a range of extended operation. Application is particularly to internal combustion engines equipped with a system for recirculation of exhaust gas.
Inventors
- 👤 Henri Arnaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/57
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
In an internal combustion engine having an intake pipe including a venturi throat, an exhaust pipe, a recirculation circuit connected between said intake and exhaust pipes, a main valve in said recirculation circuit and a first solenoid valve connected to said main valve, a device for controlling recirculation of exhaust gas through said recirculation circuit, said device comprising an additive type pneumatic amplifier including: first means for sensing a partial vacuum at said venturi throat; means for developing a pneumatic vacuum signal greater than said partial vacuum by a constant value over an extended engine operation range; and means for delivering this signal to said first solenoid valve for controlling said main valve.
Claim 2
Dependent Claim
113 words
In an internal combustion engine having an intake pipe including a venturi throat, an exhaust pipe, a recirculation circuit connected between said intake and exhaust pipes, a main valve in said recirculation circuit and a first solenoid valve connected to said main valve, a device for controlling recirculation of exhaust gas through said recirculation circuit, said device comprising an additive type pneumatic amplifier including: first means for sensing a partial vacuum at said venturi throat; means for developing a pneumatic vacuum signal greater than said partial vacuum by a constant value over an extended engine operation range; and means for delivering this signal to said first solenoid valve for controlling said main valve.
Claim 3
Dependent Claim
51 words
The device of claim 1 wherein said means for developing a pneumatic signal includes: a housing having an internal diaphragm dividing said housing into first and second chambers; and a spring in said first chamber and attached to said diaphragm whereby said constant value corresponds to the force of said spring.
Claim 4
Dependent Claim
17 words
The device of claim 2 wherein said second chamber is connected to said first means for sensing.
Claim 5
Dependent Claim
126 words
The device of claim 3 including: second means for sensing a partial vacuum in said intake pipe at a position downstream from said venturi throat; a first conduit, including a first restriction, connecting said second means for sensing with said means for delivering; a second conduit, including a second restriction, connected between said first conduit and said second chamber, said second conduit being closed when said diaphragm is biased in a first position by said spring; and a third conduit, including a third restriction, connected between said first conduit and said first chamber, whereby said means for delivering receives from said means for developing, a signal corresponding to the sum of signals from said first and second conduits, when said diaphragm moves from said first position.
Claim 6
Dependent Claim
49 words
The device of claim 4 including a supplementary device comprising: a fourth conduit, including a fourth restriction, connecting said first chamber to a source of atmospheric pressure; a second solenoid valve in said fourth conduit for selectively closing said fourth conduit; and means for controlling said second solenoid valve.
Claim 7
Dependent Claim
30 words
The device of claim 4 including a fifth conduit connected between said first conduit and said first means for sensing, said fifth conduit including a reservoir and a fifth restriction.
Claim 8
Dependent Claim
68 words
The device of claim 3 including: second means for sensing a partial vacuum in said intake pipe at a position downstream from said venturi throat; a sixth conduit connecting said third means for sensing with said means for delivering; a seventh conduit connected between said sixth conduit and said first chamber, said seventh conduit being open when said diaphragm is biased in said first position by said spring.
Claim 9
Dependent Claim
46 words
The device of claim 4 including a supplementary device comprising: an eighth conduit connecting said second chamber to a source of atmospheric pressure; a manometric valve in said eighth conduit, said manomertic valve being openable in response to a signal from said first means for sensing.
Claim 10
Dependent Claim
39 words
The device of claim 4 including a supplementary device comprising a manometric valve connected between said main valve and said first solenoid valve, said manometric valve being openable in response to a signal from said first means for sensing.
References Cited (Backward Citations)
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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) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |