Claims
- 1. An exhaust gas recycling system combined with an internal combustion engine having an air intake and exhaust manifold comprising:
- exhaust regulating means coupled to said air intake and exhaust manifold for restricting the amount of exhaust gas recycled from said exhaust manifold to said air intake manifold and for controlling a ratio of recycled exhaust gas to air intake volume, said exhaust regulating means further including a valve means for restricting the amount of recycled gas when the air intake of said internal combustion engine increases above a predetermined magnitude such that the ratio of the amount of recycled exhaust gas to air intake volume decreases as the amount of air flow continues to increase after said valve is fully opened; and
- control means coupled to said exhaust regulating means communicating with at least one of said air intake and exhaust manifolds for controlling said exhaust regulating means.
- 2. The exhaust gas recycling system of claim 1 wherein said exhaust regulating means further includes a pressure chamber communicating with said exhaust manifold through first reduction means, said first reduction means for restricting the flow of exhaust gas from said exhaust manifold to said pressure chamber by restricting the effective area of hydrodynamic flow therebetween to a first value, and wherein said valve means restricts the flow of exhaust gas from said pressure chamber to said intake manifold to an effective area of hydrodynamic flow therebetween to a variable second value having a maximum magnitude less than said first value.
- 3. The exhaust gas recycling system of claim 2 wherein said diaphragm control means is coupled to said pressure chamber and includes a control valve means for increasing the magnitude of said second value of effective area of hydrodynamic flow of said valve means within said exhaust regulating means when said exhaust gas pressure within said exhaust manifold increases.
- 4. The exhaust gas recycling system of claim 3 wherein said valve means within said exhaust regulating means is a diaphragm actuated valve member engaging a valve seat, said valve member coupled to a diaphragm mechanism, coupled in turn to said intake manifold, the amount of partial pressure coupled between said intake manifold and diaphragm mechanism being controlled by said diaphragm control means.
- 5. The exhaust gas recycling system of claim 4 wherein said diaphragm control means is a diaphragm mechanism coupled to a valve to selectively bleed atmospheric pressure into said diaphragm mechanism of said exhaust regulating means in direct proportion to pressure within said pressure chamber at least within a predetermined range of intake air volumes.
- 6. An exhaust gas recycling system combined with an internal combustion engine having an intake and exhaust manifold comprising:
- exhaust regulating means for restricting the flow of exhaust gas recycled from said exhaust manifold to said intake manifold comprising a pressure chamber, first reduction means coupled to said pressure chamber for restricting the flow of exhaust gas from a exhaust manifold through said first passage for transporting gas under pressure to said pressure chamber by restricting the effective area of flow therebetween to a first magnitude, a valve seat disposed adjacent to said pressure chamber, a first valve engaging said valve seat and restricting the flow of exhaust gas from said pressure chamber through said valve seat to said intake manifold through a second passage to an effective area of flow therebetween to a second magnitude having a maximum less than said first magnitude, a diaphragm mechanism having a master and slave chamber, and a diaphragm, said diaphragm coupled to said first valve, said slave chamber coupled to said second passage means, said first valve urged against said valve seat by a spring means, said master chamber communicating with second reduction means for restricting the flow of gas therethrough, said second reduction means communicating with said intake manifold; and
- diaphragm control means for controlling said first valve comprising a diaphragm mechanism having a master and slave chamber, and a diaphragm, said diaphragm coupled to a second valve, said master chamber communicating with said pressure chamber, said slave chamber vented to atmosphere and communicating through said second valve to said second reduction means, said second valve controlling the amount of atmospheric pressure bled into said second reduction means.
- 7. A method for controlling a ratio of recycled exhaust gas to air intake volume in an internal combustion engine having an air intake and exhaust manifold comprising the steps of:
- controlling an exhaust regulating means by diaphragm control means communicating with said intake and exhaust manifolds, said diaphragm control means generating a pneumatic control signal in response to pressure in said intake and exhaust manifolds; and
- restricting the flow of recycled gas from said exhaust manifold through said exhaust regulating means to said intake manifold in response to said pneumatic control signal from said diaphram control means, said flow of exhaust gas in said exhaust regulating means being restricted by a first valve means and a pressure timer communicating with said exhaust manifold through a first reduction means, said first reduction means for restricting the flow of exhaust gas therethrough from said exhaust manifold by restricting the effective area of hydrodynamic flow through said first reduction means to a first magnitude, said first valve means communicating with said pressure chamber for restricting the flow of exhaust gas therethrough to said air intake manifold by restricting the effective area of hydrodynamic flow through said first valve means to a second magnitude having a maximum magnitude less than said first magnitude whereby the ratio of the amount of recycled exhaust gas to air intake volume decreases as the amount of air flow continues to increase above a predetermined magnitude after said first valve is fully opened.
- 8. The method of claim 7 wherein said pneumatic control signal is atmospheric pressure controllably bled into a line coupled between said intake manifold and exhaust regulating means.
- 9. The method of claim 8 wherein said atmospheric pressure bled into said line is controlled by second valve means coupled to a diaphragm mechanism movable in response to the pressure within said pressure chamber.
- 10. The method of claim 8 wherein said first valve means is coupled to a diaphragm mechanism movable in response to partial pressures communicated thereto from said intake manifold through second reduction means, said diaphragm control means communicating with said diaphragm mechanism through at least part of said second reduction means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
51-109098 |
Sep 1976 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 757,834, now abandoned, filed Jan. 10, 1977.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
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Parent |
757834 |
Jan 1977 |
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