US3796049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation system for an internal combustion engine
Assignee: Nissan Motor Co Ltd
•
Filing: 1972-12-26
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Granted: 1974-03-12
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Expires: 1992-12-26
Abstract
Abstract An exhaust gas recirculation system for an internal combustion engine and adapted for recircurating a portion of engine exhaust gases from the exhaust manifold to the intake manifold to reduce the quantity of nitrogen oxides contained in the finally discharged exhaust gases. The exhaust gas recirculation system has an exhaust gas recirculation conduit communicating at its one end with the exhaust manifold and at the other end with the intake manifold, and a flow control valve disposed in the exhaust gas recirculation conduit to control the rate or amount of exhaust recirculation. The flow control valve is responsive to the pressure of secondary air of a secondary air supplying device incorporated in the engine, the pressure of secondary air being controlled in dependence on the variations in intake manifold vacuum.
Inventors
- 👤 Y Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/57
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
An exhaust gas recirculation system for an internal combustion engine including an intake manifold, an exhaust manifold and a secondary air supply device having a pneumatic pump driven by said engine, an air gallery communicating with said pneumatic pump and at least one secondary air injection nozzle communicating with said air gallery and opening to said exhaust manifold to supply secondary air thereinto, said exhaust gas recirculation system comprising, in combination, conduit means extending between said exhaust manifold and said intake manifold for recirculating a portion of exhaust gases emitted into said exhaust manifold to said intake manifold, valve means interposed in said conduit means to control the amount of exhaust recirculation through said conduit means, valve acTuating means having a movable member connected to a valve head of said valve means to control the movements thereof and having a control chamber communicating with said air gallery of said secondary air supply device to receive secondary air therefrom, said movable member of said valve actuating means being responsive to the pressure of said secondary air in said control chamber, and control means for controlling the pressure of said secondary air in said control chamber of said valve actuating means in dependence on the variation in intake manifold vacuum.
Claim 2
Dependent Claim
208 words
An exhaust gas recirculation system for an internal combustion engine including an intake manifold, an exhaust manifold and a secondary air supply device having a pneumatic pump driven by said engine, an air gallery communicating with said pneumatic pump and at least one secondary air injection nozzle communicating with said air gallery and opening to said exhaust manifold to supply secondary air thereinto, said exhaust gas recirculation system comprising, in combination, conduit means extending between said exhaust manifold and said intake manifold for recirculating a portion of exhaust gases emitted into said exhaust manifold to said intake manifold, valve means interposed in said conduit means to control the amount of exhaust recirculation through said conduit means, valve acTuating means having a movable member connected to a valve head of said valve means to control the movements thereof and having a control chamber communicating with said air gallery of said secondary air supply device to receive secondary air therefrom, said movable member of said valve actuating means being responsive to the pressure of said secondary air in said control chamber, and control means for controlling the pressure of said secondary air in said control chamber of said valve actuating means in dependence on the variation in intake manifold vacuum.
Claim 3
Dependent Claim
57 words
An exhaust gas recirculation system as claimed in claim 1, further comprising secondary air passage means connecting said control chamber of said valve actuating means to said air gallery of said secondary air supply device, and a flow shut-off valve disposed in said secondary air passage means to selectively open and close said secondary air passage means.
Claim 4
Dependent Claim
88 words
An exhaust gas recirculation system as claimed in claim 2, in which said control means includes branch passage means communicating with said secondary air passage means at a position between said control chamber of said valve actuating means and said flow shut-off valve and vented to the atmosphere, a valve element disposed in said branch passage means to control the effective cross-sectional area of said branch passage means, and a diaphragm device connected to said valve element to control the movements thereof in response to intake manifold vacuum.
Claim 5
Dependent Claim
78 words
An exhaust gas recirculation system as claimed in claim 3, in which said diaphragm device includes an atmospheric chamber, a vacuum chamber communicating with said intake manifold, a diaphragm member mounted between said atmospheric chamber and said vacuum chamber and connected to said valve element, and a compression spring mounted in said vacuum chamber for biasing said diaphragm member in a direction to cause said valve element to decrease the effective cross-sectional area of said branch passage means.
Claim 6
Dependent Claim
57 words
An exhaust gas recirculation system as claimed in claim 2, in which said control means includes branch passage means communicating at its one end with said secondary air passage means at a position between said control chamber of said valve actuating means and said flow shut-off valve, and a flow restrictor disposed in said branch passage means.
Claim 7
Dependent Claim
43 words
An exhaust gas recirculation system as claimed in claim 1, in which said movable member of said valve actuating means is a diaphragm member which is responsive to the pressure of said secondary air in said control chamber of said valve actuating means.
Claim 8
Dependent Claim
42 words
An exhaust gas recirculation system as claimed in claim 1, in which said movable member of said valve actuating means is a bellows which is responsive to the pressure of said secondary air in said control chamber of said valve actuating means.
References Cited (Backward Citations)
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US3648455A
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |