US3756210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control valve
Assignee: Motors Liquidation Co
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Filing: 1972-04-10
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Granted: 1973-09-04
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Expires: 1992-04-10
Abstract
Abstract An induction passage vacuum operated valve responsive to exhaust back pressure controls recirculation of exhaust gases from the intake manifold exhaust crossover passage to the intake manifold induction passages. The valve assembly is designed whereby both the induction passage vacuum signal and the exhaust back pressure signal are routed internally of the structural members, thus obviating the need for external hose connections.
Inventors
- 👤 P Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/59; F02M26/61; F02M26/55; F02M26/56; F02M26/58; F02M2026/001; F02M2026/002; F02M2026/0025; Y; Y10; Y10S; Y10S137/00; Y10S137/907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
421 words
An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of recirculation passage, valve seat means formed between said inlet and said outlet, and an orifice formed in said inlet, valve means associated with said valve seat means for controlling flow of exhaust gases therethrough, and control means for positioning said valve means to maintain a substantially constant pressure in the zone between said orifice and said valve seat means, said control means including spring means biasing said valve means toward engagement with said valve seat means, a pressure responsive member connected to said valve means, passage means subjecting said member to a control pressure created by induction passage vacuum received through a vacuum orifice connecting said passage means to said induction passage downstream of said throttle and increased by atmospheric air received through an air bleed orifice opening into said passage means, a bleed valve associated with said vacuum orifice for controlling admission of vacuum to said passage means, pressure responsive means connected to said bleed valve and subjected to the pressure in said zone whereby upon an increase in pressure in said zone said pressure responsive means displaces said bleed valve to increase admission of vacuum to said passage means through said vacuum orifice and thereby decreases said control pressure to thereby cause said pressure responsive member to overcome the bias of said spring means and displace said valve means from said valve seat means and increase recirculation of exhaust gases, and second spring means biasing said bleed valve to reduce admission of vacuum to said passage means through said vacuum orifice whereby upon a decrease in preSsure in said zone said second spring means displaces said bleed valve member to decrease admission of vacuum to said passage means through said vacuum orifice and thereby increase said control pressure to thereby permit said first spring means to displace said valve member toward said valve seat means and decrease recirculation of exhaust gases.
Claim 2
Dependent Claim
421 words
An exhaust gas recirculation control valve assembly for use on an internal combustion engine having an induction passage for air flow to the engine, a throttle disposed in said induction passage for controlling air flow therethrough, an exhaust passage for exhaust gas flow from the engine, and an exhaust gas recirculation passage having a first portion extending from said exhaust passage and a second portion extending to said induction passage downstream of said throttle, said control valve assembly comprising a valve body having an inlet for receiving exhaust gases from said first portion of said recirculation passage, an outlet for discharging exhaust gases to said second portion of recirculation passage, valve seat means formed between said inlet and said outlet, and an orifice formed in said inlet, valve means associated with said valve seat means for controlling flow of exhaust gases therethrough, and control means for positioning said valve means to maintain a substantially constant pressure in the zone between said orifice and said valve seat means, said control means including spring means biasing said valve means toward engagement with said valve seat means, a pressure responsive member connected to said valve means, passage means subjecting said member to a control pressure created by induction passage vacuum received through a vacuum orifice connecting said passage means to said induction passage downstream of said throttle and increased by atmospheric air received through an air bleed orifice opening into said passage means, a bleed valve associated with said vacuum orifice for controlling admission of vacuum to said passage means, pressure responsive means connected to said bleed valve and subjected to the pressure in said zone whereby upon an increase in pressure in said zone said pressure responsive means displaces said bleed valve to increase admission of vacuum to said passage means through said vacuum orifice and thereby decreases said control pressure to thereby cause said pressure responsive member to overcome the bias of said spring means and displace said valve means from said valve seat means and increase recirculation of exhaust gases, and second spring means biasing said bleed valve to reduce admission of vacuum to said passage means through said vacuum orifice whereby upon a decrease in preSsure in said zone said second spring means displaces said bleed valve member to decrease admission of vacuum to said passage means through said vacuum orifice and thereby increase said control pressure to thereby permit said first spring means to displace said valve member toward said valve seat means and decrease recirculation of exhaust gases.
Claim 3
Dependent Claim
27 words
The control valve assembly of claim 1 wherein said pressure responsive member is connected to said valve means by a hollow stem which provides said vacuum orifice.
Claim 4
Dependent Claim
46 words
The control valve assembly of claim 2 wherein said valve seat means is disposed coaxially with said inlet and said valve stem has a lateral opening between said pressure responsive member and said valve means which defines an opening from a region of induction passage vacuum.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |