Patent US3881456A successfully refreshed from Google Patents.
US3881456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation system
Assignee: Toyota Motor Corp
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Filing: 1974-05-29
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Granted: 1975-05-06
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Expires: 1994-05-29
Abstract
Abstract An exhaust gas recirculation system including pressure controlling means provided in the exhaust gas recirculation passage, said pressure controlling means having a pressure controlling section adapted to control air pressure in the pressure source with pressure of exhaust gas flowing into said pressure controlling means, and wherein pressure controlled by said pressure controlling section is led into a controlled pressure chamber defined by a diaphragm operable to open or close said pressure controlling means. A valve operated by pressure around a butterfly valve is provided in a conduit connecting said pressure source and said pressure controlling section. A chamber formed in said pressure controlling section for effecting pressure control is selectively communicated with said pressure source or with a part downstream of said butterfly valve. In the valve provided in the conduit connecting said pressure source and said pressure controlling section is provided a diaphragm chamber for operating said valve, the diaphragm chamber being communicated with a location adjacent said butterfly valve through a solenoid valve.
Inventors
- 👤 Hidetaka Nohira
- 👤 Kiyoshi Kobashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:00
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
235 words
An exhaust gas recirculation system in which the exhaust system and intake system of an internal combustion engine are connected to each other by a conduit so aS to recirculate a part of exhaust gas from the exhaust system into the intake system, said system comprising: a pressure control unit provided in said conduit and having a fixed throttle, a pressure chamber and valve arranged successively in that order in the direction from the exhaust system to the intake system, a pressure control section comprising: a first chamber communicated with said pressure chamber, a second chamber separated from said first chamber by a diaphragm and communicated with a pressure source and also with the atmosphere, and a valve assembly secured to said diaphragm and adapted to control communication between said second chamber and said pressure source, and a controlled pressure chamber communicated with said second chamber in said pressure control section and compartmented by a diaphragm joined to said valve in said pressure control unit, whereby compressed air supplied into said second chamber in said pressure control section from said pressure source is released into the atmosphere corresponding to pressure in said pressure chamber to control pressure in said chamber in the pressure control section, and said valve in the pressure control unit is operated responding to the thus controlled pressure so as to maintain pressure in said pressure chamber substantially equal to atmosphere pressure.
Claim 2
Dependent Claim
235 words
An exhaust gas recirculation system in which the exhaust system and intake system of an internal combustion engine are connected to each other by a conduit so aS to recirculate a part of exhaust gas from the exhaust system into the intake system, said system comprising: a pressure control unit provided in said conduit and having a fixed throttle, a pressure chamber and valve arranged successively in that order in the direction from the exhaust system to the intake system, a pressure control section comprising: a first chamber communicated with said pressure chamber, a second chamber separated from said first chamber by a diaphragm and communicated with a pressure source and also with the atmosphere, and a valve assembly secured to said diaphragm and adapted to control communication between said second chamber and said pressure source, and a controlled pressure chamber communicated with said second chamber in said pressure control section and compartmented by a diaphragm joined to said valve in said pressure control unit, whereby compressed air supplied into said second chamber in said pressure control section from said pressure source is released into the atmosphere corresponding to pressure in said pressure chamber to control pressure in said chamber in the pressure control section, and said valve in the pressure control unit is operated responding to the thus controlled pressure so as to maintain pressure in said pressure chamber substantially equal to atmosphere pressure.
Claim 3
Dependent Claim
88 words
The exhaust gas recirculation system as set forth in claim 1, wherein a valve is provided in the conduit connecting the pressure source with said second chamber in the pressure control section and with said controlled pressure chamber in the pressure control unit, and a negative pressure chamber operable to open or close said valve is connected to that part of the intake system which is located adjacent a butterfly valve so that said valve will be opened or closed according to the running condition of the engine.
Claim 4
Dependent Claim
91 words
The exhaust gas recirculation system as set forth in claim 1, wherein said pressure source and a section of the intake system downstream of the butterfly valve are communicated with said second chamber in the pressure control section through a valve, and a negative pressure chamber operable to switch said valve is communicated with a part of the intake system adjacent said butterfly valve, and wherein said pressure source and said intake system are selectively communicated with said second chamber by said valve according to the running condition of the engine.
Claim 5
Dependent Claim
79 words
The exhaust gas recirculation system as set forth in claim 2, wherein a solenoid-energized valve operated according to the running condition of the engine is provided in the conduit connecting the negative pressure chamber in said valve with a part of the intake system adjacent the butterfly valve, and when there is no need of recirculating exhaust gas, said negative pressure chamber in said valve and the intake system are shut off from each other by said solenoid-energized valve.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |