US3842814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation system
Assignee: Colt Industries Operating Corp
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Filing: 1972-12-15
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Granted: 1974-10-22
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Expires: 1992-12-15
Abstract
Abstract An exhaust gas recirculation system for recirculating a portion of the engine developed exhaust gases back to the intake of the engine has a variably openable first valve for permitting such exhaust gas recirculation, pressure responsive motor assembly for variably opening the first valve, pressure reservoir means containing a pressure of a relatively low magnitude effective for applying such low pressure to the motor assembly for actuation thereof, and pressure bleeding control valving means positioned in accordance with the position of the throttle valve of an induction device associated with the engine for controllably modifying the magnitude of the relatively low pressure.
Inventors
- 👤 K Bier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:18
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M2026/001; F02M2026/002; F02M26/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
243 words
An exhaust gas recirculation system for an internal combustion engine having first conduit means for conducting from said engine at least part of the exhaust gases generated by said engine and second intake conduit means controlled by a variably openable throttle valve for conducting therethrough a flow of atmospheric air to said engine for supporting the combustion process within said engine, said system comprising passage means interconnecting and communicating between said first and second conduit means, variably positionable valve means for controlling the flow of said exhaust gases from said first conduit means through said passage means and into said second conduit means, vacuum responsive motor means operatively connected to said variably positionable valve means for causing said variably positionable valve means to move in an opening direction in response to an actuating vacuum being communicated to said vacuum responsive motor means, a source of vacuum, third conduit means communicating with said source of vacuum and said vacuum responsive motor means, and variably openable control valve means communicating between a source of ambient pressure and said vacuum responsive motor means, said variably openable control valve means being openable generally in accordance with the degree of opening of said throttle valve, said control valve means being positioned in accordance with the position of said variably openable throttle but free of connection thereto such that sticking of said control valve means in one position could cause sticking of said throttle valve in a corresponding position.
Claim 2
Dependent Claim
243 words
An exhaust gas recirculation system for an internal combustion engine having first conduit means for conducting from said engine at least part of the exhaust gases generated by said engine and second intake conduit means controlled by a variably openable throttle valve for conducting therethrough a flow of atmospheric air to said engine for supporting the combustion process within said engine, said system comprising passage means interconnecting and communicating between said first and second conduit means, variably positionable valve means for controlling the flow of said exhaust gases from said first conduit means through said passage means and into said second conduit means, vacuum responsive motor means operatively connected to said variably positionable valve means for causing said variably positionable valve means to move in an opening direction in response to an actuating vacuum being communicated to said vacuum responsive motor means, a source of vacuum, third conduit means communicating with said source of vacuum and said vacuum responsive motor means, and variably openable control valve means communicating between a source of ambient pressure and said vacuum responsive motor means, said variably openable control valve means being openable generally in accordance with the degree of opening of said throttle valve, said control valve means being positioned in accordance with the position of said variably openable throttle but free of connection thereto such that sticking of said control valve means in one position could cause sticking of said throttle valve in a corresponding position.
Claim 3
Dependent Claim
64 words
An exhaust gas recirculation system according to claim 1 and further comprising cam means operatively connected to said throttle valve for being positioned in accordance with the piston of said throttle valve, and wherein said control valve means is operatively engageable with said cam means for being moved toward and away from a closed position in accordance with the position of said cam means.
Claim 4
Dependent Claim
40 words
An exhaust gas recirculation system according to claim 1 and further comprising restriction means situated serially between said source of vacuum and said vacuum responsive motor means so as to at least at times restrict the degree of communication therebetween.
Claim 5
Dependent Claim
41 words
An exhaust gas recirculation system according to claim 1 and further comprising fourth conduit means adapted for communication as between said source of vacuum and a source of engine generated vacuum within said intake conduit means downstream of said throttle valve.
Claim 6
Dependent Claim
61 words
An exhaust gas recirculation system according to claim 4 wherein the magnitude of said actuating vacuum more nearly approaches the magnitude of said engine generated vacuum within said intake conduit means whenever said control valve means is more nearly closed as to reduce the degree of said bleed as between said source of ambient pressure and said vacuum responsive motor means.
Claim 7
Dependent Claim
34 words
An exhaust gas recirculation system according to claim 4 and further comprising check valve means situated generally in said fourth conduit means and serially between said source of vacuum and said intake conduit means.
Claim 8
Dependent Claim
28 words
An exhaust gas recirculation system according to claim 1 wherein said vacuum responsive motor means comprises a vacuum responsive diaphragm operatively connected to said variably positionable valve means.
Claim 9
Dependent Claim
103 words
An exhaust gAs recirculation system according to claim 1 wherein the magnitude of said actuating vacuum more nearly approaches the magnitude of said vacuum within said source of vacuum whenever said control valve means is more nearly closed as to reduce the degree of said bleed as between said source of ambient pressure and said vacuum responsive motor means, and wherein the magnitude of said actuating vacuum more nearly approaches the magnitude of said ambient pressure whenever said control valve means is more nearly opened as to increase the bleed as between said source of ambient pressure and said vacuum responsive motor means.
Claim 10
Dependent Claim
110 words
An exhaust gas recirculation system according to claim 1, wherein variably openable control valve means is openable generally inversely in accordance with the degree of opening of said throttle valve so as to generally further restrict communication between said ambient pressure and said vacuum responsive motor means as said throttle valve is moved toward a more opened position, and wherein said control valve means is effective to at least at times provide a controlled degree of bleed as between said source of ambient pressure and said vacuum responsive motor in order to thereby reduce the magnitude of said vacuum from said source of vacuum and thereby create said atuating vacuum.
Claim 11
Dependent Claim
99 words
The combination of an internal combustion engine, an engine intake conduit, an engine exhaust conduit, means for supplying combustion air to said intake conduit, throttle valve means for controlling the flow of said air, a passage for conducting exhaust gas from said exhaust conduit to said intake conduit, valve means for controlling said passage and means including means operated by said throttle valve means for controlling said passage valve so that movement thereof is a function solely of throttle valve movement, said latter means being free of direct mechanical connection between said throttle valve means and said passage valve.
Claim 12
Dependent Claim
99 words
The combination of an internal combustion engine, an engine intake conduit, an engine exhaust conduit, means for supplying combustion air to said intake conduit, throttle valve means for controlling the flow of said air, a passage for conducting exhaust gas from said exhaust conduit to said intake conduit, valve means for controlling said passage and means including means operated by said throttle valve means for controlling said passage valve so that movement thereof is a function solely of throttle valve movement, said latter means being free of direct mechanical connection between said throttle valve means and said passage valve.
Claim 13
Dependent Claim
24 words
The combination of claim 10, wherein the control by said passage valve controlling means is independent of the specific value of intake conduit vacuum.
Claim 14
Dependent Claim
32 words
The combination of claim 10, wherein said passage valve controlling means is arranged so that return of said throttle valve to closed position is not effected by sticking of said passage valve.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |