Patent US4533790A successfully refreshed from Google Patents.
Patent US3882837A successfully refreshed from Google Patents.
US3882837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control device for internal combustion
Assignee: Nissan Motor Co Ltd
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Filing: 1973-03-01
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Granted: 1975-05-13
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Expires: 1993-03-01
Abstract
Abstract A flow control device for use in an exhaust gas recirculation system of an internal combustion engine and adapted to control the amount of engine exhaust gases recirculated to an intake manifold of the engine in a manner optimum for reducing toxic nitrogen oxides contained in the engine exhaust gases without impairing engine operation. The flow control device is comprised of an exhaust gas recirculation passage, a flow control valve located in the exhaust gas recirculation passage and responsive to the position of a carburetor throttle valve of the engine, and a flow restricting means located in the exhaust gas recirculation passage in series with the flow control valve. The flow restricting means includes another flow control valve responsive to a signla indicative of cold or light load operating conditions of the engine.
Inventors
- 👤 Masakazu Horie
- 👤 Takao Fukuhara
- 👤 Tetuya Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:19
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/63; F02M26/13; F02M26/39; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0276; F02M1/00; F02M26/65; F02M26/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
In an exhaust gas recirculation system of an internal combustion engine having a carburetor throttle valve and an intake manifold, a flow control device for controlling the amount of exhaust recirculation to said intake manifold, said device comprising, in combination, passage means for recirculating engine exhaust gases to said intale manifold, valve means disposed in said passage means and responsive to the opening degree of said throttle valve for varying the effective cross sectional area of said passage means, and flow restricting meAns located in said passage means in series with, and downstream of said valve means, said flow restricting means including a butterfly valve downstream of said valve means, a diaphragm type actuator responsive to intake manifold vacuum, a butterfly valve arm linked to said actuator, a passageway connecting said intake manifold to said actuator, a solenoid valve located in said passageway in response to a signal indicative of said engine operating under light load and cold condition causing said actuator to close said butterfly valve through movement of said throttle valve arm linked to said actuator.
Claim 2
Dependent Claim
178 words
In an exhaust gas recirculation system of an internal combustion engine having a carburetor throttle valve and an intake manifold, a flow control device for controlling the amount of exhaust recirculation to said intake manifold, said device comprising, in combination, passage means for recirculating engine exhaust gases to said intale manifold, valve means disposed in said passage means and responsive to the opening degree of said throttle valve for varying the effective cross sectional area of said passage means, and flow restricting meAns located in said passage means in series with, and downstream of said valve means, said flow restricting means including a butterfly valve downstream of said valve means, a diaphragm type actuator responsive to intake manifold vacuum, a butterfly valve arm linked to said actuator, a passageway connecting said intake manifold to said actuator, a solenoid valve located in said passageway in response to a signal indicative of said engine operating under light load and cold condition causing said actuator to close said butterfly valve through movement of said throttle valve arm linked to said actuator.
Claim 3
Dependent Claim
206 words
In an exhaust gas recirculation system for an internal combustion engine having a carburetor throttle valve and an intake manifold, a flow control device for controlling the amount of exhaust recirculation to said intake manifold, said device comprising, in combination, passage means for recirculating engine exhaust gases to said intake manifold, valve means disposed in said passage means for controlling the effective cross sectional area of said passage means, a mechanical linkage interconnecting said valve means to said carburetor throttle valve for thereby causing said valve means to open and close said passage means in dependence on the position of said carburetor throttle valve, and flow restricting means located in said passage means in series with, and downstream of said valve means, said flow restricting means including a butterfly valve downstream of said valve means, a diaphragm type actuator responsive to intake manifold vacuum, a butterfly valve arm linked to said actuator, a passageway connecting said intake manifold to said actuator, a solenoid valve located in said passageway to close said passageway in response to a signal indicative of said engine operating under light load and cold condition causing said actuator to close said butterfly valve through movement of said butterfly arm linked to said actuator.
Claim 4
Dependent Claim
206 words
In an exhaust gas recirculation system for an internal combustion engine having a carburetor throttle valve and an intake manifold, a flow control device for controlling the amount of exhaust recirculation to said intake manifold, said device comprising, in combination, passage means for recirculating engine exhaust gases to said intake manifold, valve means disposed in said passage means for controlling the effective cross sectional area of said passage means, a mechanical linkage interconnecting said valve means to said carburetor throttle valve for thereby causing said valve means to open and close said passage means in dependence on the position of said carburetor throttle valve, and flow restricting means located in said passage means in series with, and downstream of said valve means, said flow restricting means including a butterfly valve downstream of said valve means, a diaphragm type actuator responsive to intake manifold vacuum, a butterfly valve arm linked to said actuator, a passageway connecting said intake manifold to said actuator, a solenoid valve located in said passageway to close said passageway in response to a signal indicative of said engine operating under light load and cold condition causing said actuator to close said butterfly valve through movement of said butterfly arm linked to said actuator.
Claim 5
Dependent Claim
54 words
A flow control device according to claim 2, in which said mechanical linkage includes a first arm secured to said valve means, a connecting rod connected at its one end to said first arm, and a second arm secured to said carburetor throttle valve and connected to the other end of said connecting rod.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |