US3814070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation flow control system
Assignee: Bendix Corp
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Filing: 1972-12-26
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Granted: 1974-06-04
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Expires: 1992-12-26
Abstract
Abstract An exhaust gas recirculation flow control system for an internal combustion engine having valve means responsive to engine air flow and to recirculated exhaust gas flow and adapted to provide a scheduled flow control signal to an exhaust gas recirculation valve. Pressure responsive means are provided to sense engine air flow and recirculated exhaust gas flow so that these two variables may act singly or collectively through said valve means in order to provide exhaust gas recirculation to the engine''s intake manifold which begins smoothly and holds at a relatively constant or scheduled fraction of the engine air flow for maximum effectiveness and minimum loss in vehicle driveability. The exhaust gas recirculation control system inhibits exhaust gas recirculation until engine air flow has increased to some predetermined value and then passes exhaust gas to the intake manifold in a modifiable proportional relationship to the engine air flow. If the exhaust gas recirculation flow tends to become too high or too low a force unbalance created within the valve means closes or opens the exhaust gas recirculation valve an amount necessary to maintain a position such that the exhaust gas recirculation flow is controlled in an increasing relationship to the increasing engine air flow. As engine air flow continues to increase a point is reached in which a force unbalance is again created within the valve means causing the exhaust gas recirculation valve to completely inhibit recirculation of exhaust gas. A temperature responsive member may also be included being operative with the valve means in order to inhibit the flow of exhaust gas at a predetermined low ambient or engine compartment temperature.
Inventors
- 👤 H Wertheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:30
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/65; F02M26/66; F02M26/68; F02M26/72; F02M26/45; F02M26/46; F02M26/47
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
92 words
In an exhaust gas recirculation flow control system for an internal combustion engine having valve means disposed within the recirculated exhaust gas passage, the improvement comprising: means for generating a first differential pressure responsive to engine air flow; means for generating a second differential pressure responsive to recirculated exhaust gas flow; and means for summing said first and second differential pressures and operative to regulate the relative opening and closing of said valve means so that the volume of exhaust gas being recirculated varies in a proportional relationship to engine air flow.
Claim 2
Dependent Claim
92 words
In an exhaust gas recirculation flow control system for an internal combustion engine having valve means disposed within the recirculated exhaust gas passage, the improvement comprising: means for generating a first differential pressure responsive to engine air flow; means for generating a second differential pressure responsive to recirculated exhaust gas flow; and means for summing said first and second differential pressures and operative to regulate the relative opening and closing of said valve means so that the volume of exhaust gas being recirculated varies in a proportional relationship to engine air flow.
Claim 3
Dependent Claim
34 words
The combination as claimed in claim 1 and including further means for terminating the communication of said first pressure signal to said summation means when engine air flow has increased to a predetermined value.
Claim 4
Dependent Claim
33 words
The combination as claimed in claim 1 and including further means for terminating the communication of said first pressure signal to said summation means when the engine compartment temperature reaches a predetermined value.
Claim 5
Dependent Claim
34 words
The combination as claimed in claim 1 including further biasing means operative with said summation means for maintaining said valve means in a closed position until engine air flow reaches a predetermined minimum value.
Claim 6
Dependent Claim
159 words
In combination with an internal combustion engine having passage means for recirculating exhaust gas to the intake manifold an exhaust gas recirculation flow control system comprising: engine air flow sensing means responsive to a predetermined range of volumetric air passing therethrough and operative to provide a first pressure signal related to said air flow; first pressure sensitive means responsive to said first pressure signal; exhaust flow sensing means responsive to a predetermined range of volumetric exhaust gas passing therethrough and operative to provide a second pressure signal related to exhaust gas flow; second pressure sensitive means responsive to said second pressure signal; first valve means operatively disposed in the exhaust gas passage means so as to regulate the amount of exhaust gas entering the engine''s intake manifold; and second valve means operatively interconnecting said first and second pressure sensitive means so that said first and second pressure signals act to control the relative position of said first valvE means.
Claim 7
Dependent Claim
159 words
In combination with an internal combustion engine having passage means for recirculating exhaust gas to the intake manifold an exhaust gas recirculation flow control system comprising: engine air flow sensing means responsive to a predetermined range of volumetric air passing therethrough and operative to provide a first pressure signal related to said air flow; first pressure sensitive means responsive to said first pressure signal; exhaust flow sensing means responsive to a predetermined range of volumetric exhaust gas passing therethrough and operative to provide a second pressure signal related to exhaust gas flow; second pressure sensitive means responsive to said second pressure signal; first valve means operatively disposed in the exhaust gas passage means so as to regulate the amount of exhaust gas entering the engine''s intake manifold; and second valve means operatively interconnecting said first and second pressure sensitive means so that said first and second pressure signals act to control the relative position of said first valvE means.
Claim 8
Dependent Claim
42 words
The combination as claimed in claim 5 wherein said second valve means is operative to move between a first port and a second port, said first port being exposed to ambient air and said second port being exposed to intake manifold vacuum.
Claim 9
Dependent Claim
63 words
The combination as claimed in claim 5 including further third valve means operatively disposed between said engine air flow sensing means and said second valve means, said third valve means being operative to move between a first position wherein said first pressure signal is communicated to said second valve means and second position wherein ambient air is communicated to said second valve means.
Claim 10
Dependent Claim
29 words
The combination as claimed in claim 7 including further a temperature responsive member operatively connected to said third valve means to control its relative position under predetermined temperature conditions.
Claim 11
Dependent Claim
41 words
The combination as claimed in claim 7 wherein said third valve means includes a third pressure sensitive means, said pressure sensitive means being exposed to said first pressure signal on side thereof and to ambient air on the other side thereof.
Claim 12
Dependent Claim
30 words
The combination as claimed in claim 5 including further at least one carburetor for providing an air fuel mixture to the engine, said carburetor having at least one venturi therein.
Claim 13
Dependent Claim
40 words
The combination as claimed in claim 10 wherein the engine air flow sensing means includes an opening in the throat of said carburetor venturi, and passage means for communicating the pressure at said opening to said first pressure sensitive means.
Claim 14
Dependent Claim
49 words
The combination as claimed in claim 5 wherein said exhaust flow sensing means includes a venturi disposed in the exhaust gas passage means, said venturi having an opening in the throat thereof; and passage means operative to communicate the pressure at said opening to said second pressure sensitive means.
Claim 15
Dependent Claim
50 words
The combination as claimed in claim 5 wherein said exhaust flow sensing means includes a flow sensing element disposed within the exhaust gas passage means, said flow sensing element having an opening therethrough; and passage means operative to communicate the pressure at said opening to said second pressure sensitive means.
Claim 16
Dependent Claim
108 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first differential pressure related to engine air flow; exhaust gas flow responsive means operative to provide a second differential pressure related to exhaust gas flow; and means for summing said first and second differential pressures and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow.
Claim 17
Dependent Claim
108 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first differential pressure related to engine air flow; exhaust gas flow responsive means operative to provide a second differential pressure related to exhaust gas flow; and means for summing said first and second differential pressures and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow.
Claim 18
Dependent Claim
44 words
The combination as claimed in claim 14 wherein said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure and said second port being exposed to intake manifold vacuum.
Claim 19
Dependent Claim
45 words
The combination as claimed in claim 14 wherein said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure, and said second port being exposed to carburetor spark port vacuum.
Claim 20
Dependent Claim
45 words
The combination as claimed in claim 14 including further passage means for communicating said first pressure signal to said summing means; and valve means operatively disposed in said passage means such that it controls the communication of said first pressure signal to said summing means.
Claim 21
Dependent Claim
38 words
The combination as claimed in claim 17 including further temperature responsive means operatively connected to said valve means such that said first pressure signal is prevented from reaching said summing means when A predetermined temperature condition is reached.
Claim 22
Dependent Claim
115 words
In an exhaust gas recirculation flow control system for an internal combustion engine having valve means disposed within the recirculated exhaust gas passage, the improvement comprising: means for generating a first pressure signal responsive to engine air flow; means for generating a second pressure signal responsive to recirculated exhaust gas flow; means for summing said first and second pressure signals and operative to regulate the relative opening and closing of said valve means so that the volume of exhaust gas being recirculated varies in a proportional relationship to engine air flow; and means for terminating the communication of said first pressure signal to said summation means when the engine compartment temperature reaches a predetermined value.
Claim 23
Dependent Claim
115 words
In an exhaust gas recirculation flow control system for an internal combustion engine having valve means disposed within the recirculated exhaust gas passage, the improvement comprising: means for generating a first pressure signal responsive to engine air flow; means for generating a second pressure signal responsive to recirculated exhaust gas flow; means for summing said first and second pressure signals and operative to regulate the relative opening and closing of said valve means so that the volume of exhaust gas being recirculated varies in a proportional relationship to engine air flow; and means for terminating the communication of said first pressure signal to said summation means when the engine compartment temperature reaches a predetermined value.
Claim 24
Dependent Claim
144 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first pressure signal related to engine air flow; exhaust gas flow responsive means operative to provide a second pressure signal related to exhaust gas flow; and means for summing said first and second pressure signals and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow, said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure and said second port being exposed to intake manifold vacuum.
Claim 25
Dependent Claim
144 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first pressure signal related to engine air flow; exhaust gas flow responsive means operative to provide a second pressure signal related to exhaust gas flow; and means for summing said first and second pressure signals and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow, said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure and said second port being exposed to intake manifold vacuum.
Claim 26
Dependent Claim
145 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first pressure signal related to engine air flow; exhaust gas flow responsive means operative to provide a second pressure signal related to exhaust gas flow; and means for summing said first and second pressure signals and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow, said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure, and said second port being exposed to carburetor spark port vacuum.
Claim 27
Dependent Claim
145 words
In combination with an internal combustion engine having exhaust gas passage means for recirculating exhaust gas to the engine intake manifold, an exhaust gas recirculation flow control system comprising: engine air flow responsive means operative to provide a first pressure signal related to engine air flow; exhaust gas flow responsive means operative to provide a second pressure signal related to exhaust gas flow; and means for summing said first and second pressure signals and operative to regulate the amount of exhaust gas being recirculated to the engine''s intake manifold so that the volume of exhaust gas being recirculated varies in a modifiable proportional relationship to engine air flow, said summing means includes a piston member which moves between a first port and a second port, said first port being exposed to ambient air pressure, and said second port being exposed to carburetor spark port vacuum.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |