US4071006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculating system
Assignee: Nissan Motor Co Ltd
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Filing: 1976-08-11
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Granted: 1978-01-31
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Expires: 1996-08-11
Abstract
Abstract An internal combustion engine equipped with an exhaust gas recirculating system is provided. The exhaust gas recirculating system comprises an EGR valve normally closing an EGR duct to prevent recirculation and movable by a signal vacuum applied thereto to an open position and control means operable to provide a signal vacuum. The control means includes a vacuum line connecting a vacuum port communicating with the carburetor throttle bore above the idle speed position of the throttle valve to the EGR valve, air bleed means including a vent in the vacuum line and flow restricting means in the vacuum line fluidly intermediate the vacuum port and vent. The air bleed means includes an air bleed control valve movable into and out of the vent to close or open the same; spring means biasing the air bleed valve closed; servo means connected to the air bleed control valve for moving it to an open vent position in response to vacuum in the vacuum line intermediate the flow restricting means and EGR valve; means for biasing the servo means in response to the engine intake manifold vacuum in a direction to move the air bleed control valve to an open vent position; and means for biasing the biasing means to vary movement of the air bleed control valve to an open vent position.
Inventors
- 👤 Ietsuya Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
241 words
In an internal combustion engine having an intake system with a throttle valve and an exhaust system, an exhaust gas recirculating system comprising: an EGR duct connecting the exhaust gases passing through the exhaust system to the intake system; an EGR valve normally closing said EGR duct to prevent recirculation and movable by a signal vacuum applied thereto to an open position; control means operable to provide a signal vacuum to said EGR valve including a vacuum line connecting a vacuum port communicating with the intake system above the idle speed position of the throttle valve to said EGR valve; air bleed means including a vent in said vacuum line; and flow restricting means in said vacuum line fluidly intermediate said vacuum port and vent; said air bleed means including an air bleed control valve movable into and out of said vent to close or open the same; first means biasing said air bleed valve closed; servo means connected to said air bleed control valve for moving it to an open vent position in response to vacuum in said vacuum line intermediate said flow restricting means and EGR valve; second means for biasing said servo means in response to the engine manifold vacuum in a direction to move said air bleed control valve to an open vent position; and third means for biasing said second biasing means to vary movement of said air bleed control valve to an open vent position.
Claim 2
Dependent Claim
241 words
In an internal combustion engine having an intake system with a throttle valve and an exhaust system, an exhaust gas recirculating system comprising: an EGR duct connecting the exhaust gases passing through the exhaust system to the intake system; an EGR valve normally closing said EGR duct to prevent recirculation and movable by a signal vacuum applied thereto to an open position; control means operable to provide a signal vacuum to said EGR valve including a vacuum line connecting a vacuum port communicating with the intake system above the idle speed position of the throttle valve to said EGR valve; air bleed means including a vent in said vacuum line; and flow restricting means in said vacuum line fluidly intermediate said vacuum port and vent; said air bleed means including an air bleed control valve movable into and out of said vent to close or open the same; first means biasing said air bleed valve closed; servo means connected to said air bleed control valve for moving it to an open vent position in response to vacuum in said vacuum line intermediate said flow restricting means and EGR valve; second means for biasing said servo means in response to the engine manifold vacuum in a direction to move said air bleed control valve to an open vent position; and third means for biasing said second biasing means to vary movement of said air bleed control valve to an open vent position.
Claim 3
Dependent Claim
50 words
An exhaust gas recirculating system as claimed in claim 1, in which said third biasing means includes a variable chamber defined by said servo means, said variable chamber being fluidly connected to an engine driven air pump for the engine secondary air supply system to receive a compressed air therefrom.
Claim 4
Dependent Claim
48 words
An exhaust gas recirculating system as claimed in claim 1, in which said second and third biasing means include a variable chamber fluidly connected to the engine intake manifold and also connected to a second vacuum port communicating with the intake system above said first mentioned vacuum port.
Claim 5
Dependent Claim
54 words
An exhaust gas recirculating system as claimed in claim 1, in which said second and third biasing means include a variable chamber defined by said servo means, said variable chamber being fluidly connected to the engine intake manifold and also connected to a second vacuum port communicating with the venturi of the intake system.
Claim 6
Dependent Claim
67 words
An exhaust gas recirculating system as claimed in claim 1, in which said second and third biasing means include a variable chamber defined by said servo means, said variable chamber being fluidly connected to the engine intake manifold vacuum; and solenoid valve means for normally permitting the bleed of air to said variable chamber, but for preventing the bleed of air during a predetermined engine operating condition.
Claim 7
Dependent Claim
36 words
An exhaust gas recirculating system as claimed in claim 1, in which said air bleed control valve includes a disc-like valve member cooperating with said vent to vary the bleed of air to said vacuum line.
Claim 8
Dependent Claim
179 words
An exhaust gas recirculating system as claimed in claim 6, in which said air bleed means includes a casing; said servo means comprises a relatively large, in effective area, diaphragm, a relatively small, in effective area, diaphragm and a rod interconnecting said large and small diaphragms, said large diaphragm defining in said casing a first chamber, said large and small diaphragms defining therebetween and in said casing a second chamber, said small diaphragm defining in said casing a third chamber, said second chamber being divided by a partition into a first subchamber adjacent said large diaphragm and into a second subchamber adjacent said small diaphragm; and said disc-like valve member is fixed centrally to said large diaphragm, said first chamber communicating with the atmosphere, said first subchamber being fluidly connected to said vacuum line at a location intermediate said vent and EGR valve, said second subchamber being fluidly connected to an engine driven air pump for the engine secondary air supply system to receive a compressed air therefrom, said third chamber being fluidly connected to the engine intake manifold.
Claim 9
Dependent Claim
31 words
An exhaust gas recirculating system as claimed in claim 7, in which said air bleed means includes an air filter by way of which said first chamber communicates with the atmosphere.
Claim 10
Dependent Claim
29 words
An exhaust gas recirculating system as claimed in claim 7, in which said air bleed means includes the engine air cleaner to which said first chamber is fluidly connected.
Claim 11
Dependent Claim
147 words
An exhaust gas recirculating system as claimed in claim 6, in which said air bleed means includes a casing; said servo means comprises a relatively large, in effective area, diaphragm, a relatively small, in effective areas, diaphragm and a rod interconnecting said large and small diaphragms, said large diaphragm defining in said casing a first chamber, said large and small diaphragm defining therebetween and in said casing a second chamber, said small diaphragm defining in said casing a third chamber; and said disc-like valve member is fixed centrally to said large diaphragm, said first chamber being fluidly connected to an engine driven air pump for the engine secondary air supply system to receive a compressed air therefrom, said second chamber being fluidly connected to said vacuum line at a location intermediate said vent and EGR valve, said third chamber being fluidly connected to the engine intake manifold.
Claim 12
Dependent Claim
166 words
An exhaust gas recirculating system as claimed in claim 6, in which said air bleed means includes a casing; said servo means comprises a relatively large, in effective area, diaphragm, a relatively small, in effective area, diaphragm and a rod interconnecting said large and small diaphragms, said large diaphragm defining in said casing a first chamber, said large and small diaphragm defining therebetween and in said casing a second chamber, said small diaphragm defining in said casing a third chamber; and said disc-like valve member is fixed centrally to said large diaphragm, said first chamber communicating with the atmosphere, said second chamber being fluidly connected to said vacuum line at a location intermediate said vent and EGR valve, said third chamber being fluidly connected to the engine intake manifold by way of a flow restricting means and also connected to a second vacuum port by way of a flow restricting means, said second vacuum port communicating with the intake system above said first mentioned vacuum port.
Claim 13
Dependent Claim
31 words
An exhaust gas recirculating system as claimed in claim 11, in which said air bleed means includes an air filter by way of which said first chamber communicates with the atmosphere.
Claim 14
Dependent Claim
28 words
An exhaust gas recirculating system as claimed in claim 11, in which said bleed means includes the engine air cleaner to which said first chamber is fluidly connected.
Claim 15
Dependent Claim
162 words
An exhaust gas recirculating system as claimed in claim 6, in which said air bleed means includes a casing; said servo means comprises a relatively large, in effective area, diaphragm, a relatively small, in effective area, diaphragm and a rod interconnecting said large and small diaphragms, said large diaphragm defining in said casing a first chamber, said large and small diaphragms defining therebetween and in said casing a second chamber, said small diaphragm defining in said casing a third chamber; and said disc-like valve member is fixed centrally to said large diaphragm, said first chamber communicating with the atmosphere, said second chamber being fluidly connected to said vacuum line at a location intermediate said vent and EGR valve, said third chamber being fluidly connected the engine intake manifold by way of a flow restricting means and also connected to a second vacuum port by way of a flow restricting means, said second vacuum port communicating with the venturi of said intake system.
Claim 16
Dependent Claim
31 words
An exhaust gas recirculating system as claimed in claim 14, in which said air bleed means includes an air filter by way of which said first chamber communicates with the atmosphere.
Claim 17
Dependent Claim
29 words
An exhaust gas recirculating system as claimed in claim 14, in which said air bleed means includes the engine air cleaner to which said first chamber is fluidly connected.
Claim 18
Dependent Claim
191 words
An exhaust gas recirculating system as claimed in claim 6, in which said air bleed means includes a casing; said servo means comprises a relatively large, in effective area, diaphragm, a relatively small, in effective area, diaphragm and a rod interconnecting said large and small diaphragms, said large diaphragm defining in said casing a first chamber, said large and small diaphragms defining therebetween and in said casing a second chamber, said small diaphragm defining in said casing a third chamber; and said disc-like valve member is fixed centrally to said large diaphragm, said first chamber communicating with the atmosphere, said second chamber being fluidly connected to said vacuum line at a location intermediate said vent and EGR valve, said third chamber being fluidly connected to the engine intake manifold by way of a flow restricting means and also connected to a second vent by way of a flow restrictor, said air bleed means including solenoid valve means for normally opening said second vent to permit the bleed of air to said third chamber, but for closing said second vent to prevent the bleed of air during a predetermined engine operating condition.
Claim 19
Dependent Claim
31 words
An exhaust gas recirculating system as claimed in claim 17, in which said air bleed means includes an air filter by way of which said first chamber communicates with the atmosphere.
Claim 20
Dependent Claim
29 words
An exhaust gas recirculating system as claimed in claim 17, in which said air bleed means includes the engine air cleaner to which said first chamber is fluidly connected.
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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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |