US3741179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculating system control
Assignee: Ford Motor Co
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Filing: 1971-07-01
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Granted: 1973-06-26
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Expires: 1991-07-01
Abstract
Abstract A portion of the engine exhaust gases are connected to the engine air cleaner through valving that is opened to permit recirculation in response to normal accelerating levels of engine spark port intake manifold vacuum, and is closed to terminate recirculation upon a buildup in exhaust gas back pressure acting on the valving.
Inventors
- 👤 R Vartanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:56
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10013; F02M26/00; F02M26/13; F02M26/17; F02M26/21; F02M26/39; F02M26/51; F02M26/52; F02M26/55; F02M26/59; F02M26/61; F02M26/65; F02M26/66; F02M26/67; F02M26/68; F02M35/10242; F02M35/10255; F02M35/10268; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0276; Y; Y10; Y10S; Y10S55/00; Y10S55/28; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A system for recirculating exhaust gases from the exhaust manifold of an internal combustion engine back into said engine through the air cleaner thereof, said air cleaner comprising a housing having an outlet to the carburetor of said engine and a fresh air inlet, a conduit containing exhaust manifold gases operatively connected to said inlet, first means variably movable between positions opening and closing said conduit to control the flow of exhaust gas into said air cleaner and carburetor, vacuum power means controlled in response to variations in engine intake manifold vacuum to move said first means between said positions, second valve means controlling the flow of exhaust gases out of said conduit, and spring means biasing said second valve means to a position closing said gas conduit, said first means moving said second valve means to open said gas conduit.
Claim 2
Independent Claim
141 words
A system for recirculating exhaust gases from the exhaust manifold of an internal combustion engine back into said engine through the air cleaner thereof, said air cleaner comprising a housing having an outlet to the carburetor of said engine and a fresh air inlet, a conduit containing exhaust manifold gases operatively connected to said inlet, first means variably movable between positions opening and closing said conduit to control the flow of exhaust gas into said air cleaner and carburetor, vacuum power means controlled in response to variations in engine intake manifold vacuum to move said first means between said positions, second valve means controlling the flow of exhaust gases out of said conduit, and spring means biasing said second valve means to a position closing said gas conduit, said first means moving said second valve means to open said gas conduit.
Claim 3
Dependent Claim
77 words
A system as in claim 1, said second valve means having a first passage connected at all times to said exhaust gases, a movable valve member biased by said spring means to a position closing said passage, said first means engaging said valve member and moving said valve member to open said passage at times to said air inlet, an increase in pressure of said exhaust gases above a predetermined level effecting a closing of said passage.
Claim 4
Dependent Claim
41 words
A system as in claim 1, said second valve means being acted upon by said gases and movable above a predetermined pressure thereof in a direction to close said gas conduit to terminate flow of said gases into said air cleaner.
Claim 5
Dependent Claim
26 words
A system as in claim 3, said second valve means including a second valve member movable by said exhaust gases acting thereagainst to close said passage.
Claim 6
Dependent Claim
18 words
A system as in claim 4, said spring means being positioned between said first and second valve members.
Claim 7
Independent Claim
237 words
A system for recirculating exhaust gases from the exhaust manifold of an internal combustion engine back into said engine through the air cleaner thereof, said air cleaner comprising a housing having an outlet to the carburetor of said engine and a fresh air inlet, a conduit containing exhaust manifold gases and operatively cOnnected to said inlet, first means variably movable between positions opening and closing said conduit to control the flow of exhaust gas into said air cleaner inlet to the carburetor, vacuum power means controlled in response to variations in engine intake manifold vacuum to move said first means between said positions, second valve means controlling the flow of exhaust gases out of said conduit, said second valve means including a valve body defined by the conduit having a gas inlet and outlet and a gas passage therebetween, said gas inlet containing said exhaust gases and said gas outlet being operatively connected to said air inlet, first and second valve members movably associated respectively with said gas outlet and gas inlet, spring means between said valve members biasing said members to seated positions against said gas inlet and gas outlet closing said gas outlet, said first means in its movement engaging said first valve member to move said first valve member to open said gas outlet, a rise in exhaust gas pressure above a predetermined level moving said second valve member to close said gas outlet.
Claim 8
Independent Claim
237 words
A system for recirculating exhaust gases from the exhaust manifold of an internal combustion engine back into said engine through the air cleaner thereof, said air cleaner comprising a housing having an outlet to the carburetor of said engine and a fresh air inlet, a conduit containing exhaust manifold gases and operatively cOnnected to said inlet, first means variably movable between positions opening and closing said conduit to control the flow of exhaust gas into said air cleaner inlet to the carburetor, vacuum power means controlled in response to variations in engine intake manifold vacuum to move said first means between said positions, second valve means controlling the flow of exhaust gases out of said conduit, said second valve means including a valve body defined by the conduit having a gas inlet and outlet and a gas passage therebetween, said gas inlet containing said exhaust gases and said gas outlet being operatively connected to said air inlet, first and second valve members movably associated respectively with said gas outlet and gas inlet, spring means between said valve members biasing said members to seated positions against said gas inlet and gas outlet closing said gas outlet, said first means in its movement engaging said first valve member to move said first valve member to open said gas outlet, a rise in exhaust gas pressure above a predetermined level moving said second valve member to close said gas outlet.
Claim 9
Dependent Claim
28 words
A system as in claim 6, said second valve member including gas bypass means permitting bypass of exhaust gases through said gas inlet past said second valve member.
Claim 10
Dependent Claim
35 words
A system as in claim 6, said first valve member having essentially a disc-like shape, said second valve member having essentially a U-shape receiving the first valve member at times in the open end thereof.
Claim 11
Dependent Claim
30 words
A system as in claim 6, said second valve member including means engagable with said valve body to close said passage regardless of the position of said first valve member.
Claim 12
Dependent Claim
33 words
A system as in claim 9, the legs of said second valve member defining with said valve body the said passage, said legs being engagable with said valve body to close said passage.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |