CA1140822A - Fuel injection control system - Google Patents
Fuel injection control systemInfo
- Publication number
- CA1140822A CA1140822A CA000357856A CA357856A CA1140822A CA 1140822 A CA1140822 A CA 1140822A CA 000357856 A CA000357856 A CA 000357856A CA 357856 A CA357856 A CA 357856A CA 1140822 A CA1140822 A CA 1140822A
- Authority
- CA
- Canada
- Prior art keywords
- air
- fuel
- cylinders
- ducts
- controlling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Output Control And Ontrol Of Special Type Engine (AREA)
- Measuring Volume Flow (AREA)
Abstract
FUEL INJECTION CONTROL SYSTEM
ABSTRACT OF THE DISCLOSURE
A fuel and air metering system is disclosed for use in an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders. The fuel and air metering system includes a plurality of air intake ducts operably connected to respective cylinders for providing air flow into those cylinders. Air flowing through the air intake ducts is controlled by throttles positioned in the air intake ducts.
The fuel and air metering system is also provided with apparatus for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through the air ducts.
ABSTRACT OF THE DISCLOSURE
A fuel and air metering system is disclosed for use in an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders. The fuel and air metering system includes a plurality of air intake ducts operably connected to respective cylinders for providing air flow into those cylinders. Air flowing through the air intake ducts is controlled by throttles positioned in the air intake ducts.
The fuel and air metering system is also provided with apparatus for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through the air ducts.
Description
FUEL INJECTION CONTROL SYSTEM
FIELD OF THE INVENTION
The invention relates to fuel and air flow control mechanisms for internal combustion engines, and more particularly relates to a fuel supply control mechanism which controls the fuel supplied to fuel injectors in proportion to the amount of air flowing into the engine cylinders.
BACKGROUND PRIOR ART
10 Examples of prior art fuel flow control mechanisms are illustrated in the U.S. Haase Patent No. 3,114,359, issued December 17, 1963; and in the U.S. Moulds Patent No. 3,789,819, issued February 5, 1974.
Attention is also directed to the U.S.
Stern et al Patent No. 2,181,286, issued November 28, 1939; the U.S. Camner Patent No. 2,270,410, .,~"
.
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issued January 20, 1942; the U.S. Volli Patent No.
FIELD OF THE INVENTION
The invention relates to fuel and air flow control mechanisms for internal combustion engines, and more particularly relates to a fuel supply control mechanism which controls the fuel supplied to fuel injectors in proportion to the amount of air flowing into the engine cylinders.
BACKGROUND PRIOR ART
10 Examples of prior art fuel flow control mechanisms are illustrated in the U.S. Haase Patent No. 3,114,359, issued December 17, 1963; and in the U.S. Moulds Patent No. 3,789,819, issued February 5, 1974.
Attention is also directed to the U.S.
Stern et al Patent No. 2,181,286, issued November 28, 1939; the U.S. Camner Patent No. 2,270,410, .,~"
.
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issued January 20, 1942; the U.S. Volli Patent No.
2,398,878, issued April 23, 1946; and the U.S.
Blakeslee Patent No. 2,562,656, issued July 31, 1951.
Attention is further directed to the U.S.
Loftin Jr. Patent No. 2,734,729, issùed February 14, 1956; the U.S. Aldridge Patent No. 2,870,759, issued January 27, 1959; the U.S. Goldsmith et al Patent No. 3,007,463, issued November 7, 1961; and the U.S. Cameron Patent Mo. 3,103,211, issued September 10, 1963.
Attention is additionally directed to the U.S. Kobayashi Patent No. 3,651,791, issued March 28, 1972; the U.S. Bishop Patent No. 3,696,798, issued October 10, 1972; the U.S. Boue Patent No.;,
Blakeslee Patent No. 2,562,656, issued July 31, 1951.
Attention is further directed to the U.S.
Loftin Jr. Patent No. 2,734,729, issùed February 14, 1956; the U.S. Aldridge Patent No. 2,870,759, issued January 27, 1959; the U.S. Goldsmith et al Patent No. 3,007,463, issued November 7, 1961; and the U.S. Cameron Patent Mo. 3,103,211, issued September 10, 1963.
Attention is additionally directed to the U.S. Kobayashi Patent No. 3,651,791, issued March 28, 1972; the U.S. Bishop Patent No. 3,696,798, issued October 10, 1972; the U.S. Boue Patent No.;,
3,757,796, issued September 11, 1973; and the ~.S.
Taira Patent No. 4,058,101, issued November 15, 1977.
SUM~lARY OF THE INVENTION
.
. 20 The invention provides a fuel and air metering system for an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders, which fuel and air metering system comprises respective air intake ducts operably connected to each of the cylinders for providing air flow into the cylinders, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective tbrottle .~ .
:. . . . . .
:' ~
. .
plates pivotally positioned in each of the air intake ducts and joined together for unitary movement, means for supplying fuel to the cylinders, and means for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through the air ducts.
The invention also provides a fuel and air metering system comprising a plurality of air intake ducts operably connected to a plurality cylinders for providing air flow into the cylinders and each including a venturi section defining a throat, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective throttles positioned in each of the air intake ducts, means for supplying fuel to the cylinders, respective first pressure taps communicating with each of the venturi throats, respective second pressure taps in each of the ducts in spaced relation from the throats, a diaphragm chamber, a flexible diaphragm dividing said diaphragm chamber into a first chamber portion and a second chamber portion, means for providing fluid communication between the first chamber portion and all of the first pressure taps, means for providing fluid communication between the second chamber portion and all of the second pressure taps, and means for controlling supply of fuel to the cylinders by said fuel supply means in response to movement of the diaphragm, whereby the amount of air flow through all of the air ducts is sensed and the amount of fuel supplied to the cylinders is controlled in proportion to the amount of air flowing through all of the air ducts.
The invention also provides a fuel and air metering system comprising a plurality of air intake ducts operably . ~ . . .
. ~ , ~ , . .
.. ' ' ' ~ :
.
`:114V8Z2 connected to a plurality cylinders for poviding air flow into the cylinders and each including a venturi section defining a throat, and a tuned length, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective throttles positioned in each of the air intake ducts, respective fuel injectors operably connected to each of the cylinders for injecting fuel into the cylinders, and means for supplying fuel to the fuel injectors, and means for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cyinders in proportion to the amount o air flowing through the air ducts, which sensing and controlling means includes respective first pressure taps communicating with each of the venturi throats and respective second pressure taps in each of the ducts in spaced relation from the throats, a diaphragm chamber, a flexible diaphragm dividing the diaphragm chamber into a first chamber portion and assecond chamber portion, means for providing fluid communication between the first chamber portion and all of the first air pressure taps, means for providing fluid communication between the second chamber portion and all of the second pressure taps, and means for controlling fuel flow to the cylinders in response to movement of the diaphragm.
Other features and advantages of the invention are set forth in the following description of a preferred embodiment, in the claims, and in the drawings.
1~4~822 BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic illustration of a fuel and air metering system embodying the invention and adapted to supply fuel and air to an internal S combustion engine.
Before explaining one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following descrip-tion or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it should be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF A PREFERRED EMBODIMENT
Illustrated in the drawings is a fuel and air metering system 10 for use in supplying fuel and air to an internal combustion engine 12, the engine 12 being schematically shown as including three in-line cylinders 14, 16 and 18. While the illustrated engine 12 has three cylinders, it will be readily appreciated by one skilled in the art that the fuel and air metering system could be incorporated with a wide variety of types of internal combustion engines and regardless of the number of cylinders employed.
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The fuel and air metering system 10 is comprised of a controller 20 adapted to be fixedly mounted to the engine block 15 and including independent air ducts 22, 24 and 26 providing separate air intake passages for supplying air to the cylinders 14, 16 and 18 respectively. Each of the air ducts 22, 24, and 26 includes a means therein for controlling air flow into the respective cylinders. While such air flow controlling means can have various constructions, in the illustrated arrangement they are comprised of pivotable throttle plates 28, 30 and 32. The throttle plates 28, 30 and 32 are each pivotably supported on a central shaft 34 which extends through the air intake passages 22, 24 and 26 of the controller 20 and bisects each of those air intake passages. In a preferred form of the invention the air ducts 22, 24 and 26 can also have a tuned length to maximize air flow into the engine at a desired engine speed to thereby maximize efficiency and power output at that speed.
The fuel and air metering system 10 also includes means for supplying fuel to the cylinders, such fuel supplying means comprising fuel injectors 36, 38 and 40. While various means can be provided for supplying fuel to the fuel injectors, as illus-trative of such means, a fuel pump 42 is employed to convey fuel through a fuel supply lir.e 44, including a flow restricting means 45, to the fuel injectors 36, 3~ and 40.
Means are also provided for controlling the amount of fuel supplied to the fuel line 44 and the ..~
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fuel injectors 36, 38 and 40 in proportion to the amount of air flowing through air ducts 22, 24, and 26. Such means includes a fuel supply control valve 46 connected to the fuel line 44, the valve 46 controlling fuel f~ow to a fuel return line or bypass 47. While the fuel control valve 46 can have various constructions, in the illustrated arrangement the fuel control valve 46 includes a reciprocal valve pin 48 having one end movable into engagement with an associated valve seat 50.
Movement of the valve pin 48 toward the valve seat 50 restricts fuel flow to the return line 47 and causes increased flow of fuel through the fuel supply conduit 44 connected to the injectors 36, 38 and 40. Other suitable means for controlling the fuel flow could comprise other means for varying the size of a fuel orifice or means for changing the delivery of the fuel pump.
The end of the movable pin 48 opposite that end engageable with the valve seat of the fuel control valve 46 is attached to a flexible diaphragm 60 which bisects a diaphragm housing 62 and forms a first diaphragm chamber 64 and a second diaphragm chamber 66. A compression spring 68 is also : ~ 25 provided for engagement with the flexible diaphragm 60 and for biasing the flexible diaphragm 60 and the valve pin 48 toward a position wherein the valve pin 48 is spaced from the valve seat 50 to permit fuel flow through the return conduit 47 thereby restricting fuel flow to the fuel injectors.
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The air passages of the air ducts 22, 24 and 26 also each include a venturi portion 52 defining a throat. First pressure sensing taps 54 are located at the venturi throats, and second pressure sensing taps 56 are located in the air passages but spaced from the venturi throats, the second pressure sensing taps 56 each generally comprising an impact tube extending into the duct.
As illustrated schematically in Fig. 1 the impact tubes 56 are connected through conduits 70, 72, 74 and 76 to the second diaphragm chamber 66, and the first pressure sensing taps are connected through similar conduits 78, 80, 82 and 84 to the first pressure sensing chamber 64 of the diaphragm housing 62.
In operation of the fuel and air flow control mechanism of the invention, rotation of the shaft 34 supporting the throttle plates 28, 30 and 32 causes variation in the amount of air flow through the air ducts 22, 24 and 26 and into the cylinders 14, 16 and 18. Due to the venturi effect, the pressure sensed at the pressure taps 54 located in the throats of the venturies 52 will be less than the pressure sensed at the impact tubes 56. Accordingly, the air pressure in the first diaphragm housing chamber 64 will be lower than the pressure in the second diaphragm housing chamber 66, and this pressure differential will increase with increased air flow velocity through the air ducts. A decrease in the pressure sensed in the first diaphragm housing chamber 64 will cause movement of the flexible diaphragm 60 to a position , ;
wherein the valve pin 48 will further restrict fuel flow through the bypass line 47 and thereby increased fuel flow to the fuel injectors 36, 38 and 40. A
decrease in the air flow velocity through tbe air ducts will cause a decrease in the pressure differ-ential sensed on the opposite sides of the flexible diaphragm 60, thereby causing the valve pin 48 to move away from the valve seat SO to thereby permit increased fuel flow through the return line 47 and to reduce the fuel flow to the injectors.
One of the advantages of the present invention is that air flow into the cylinders is provided through individual air ducts 22, 24 and 26 rather than through an intake manifold or plenem.
Because of the dynamics of the intermittent air flow into the cylinders of an internal combustion engine, it is difficult to achieve uniform flow of air to all of the cylinders if the air flows into a manifold or plenum and then into the combustion chamber of the engine. The invention provides means for eliminating the manifold and or plenum by providing separate air inlet ducts for each of the cylinders of the engine and thereby tends to equalize the quantity of air entering each cylinder and improving the engine efficiency.
Another of the advantages of tbe invention is that by providing a mechanism facilitating incorporation of separate air inlet ducts for each cylinder, the length of each of the ducts can be established so as to provide a tuned duct thereby maximizing the air flow into the engine and hence the power output of the engine at a desired engine speed.
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Another of the advantages of the invention is that by providing means for sensing the air flow through each of the ducts and by using these signals to control fuel flow to the fuel injectors, the pressure variations resulting from pulsating air flow through a single duct is minimize. If a signal from a single duct were used, the air flow through that duct would control the amount of fuel fed to the each of the cylinders. A malfunction of the cylinder fed by that duct, such as by a fouled spark plug, for example, would result in an undesir-able change in the amount of fuel supplied to the other cylinders. By providing means for conveying a signal from each of the separate air ducts to affect operation of the fuel flow control means, this disadvantage is avoided.
Various features of the invention are set forth in the following claims.
.
Taira Patent No. 4,058,101, issued November 15, 1977.
SUM~lARY OF THE INVENTION
.
. 20 The invention provides a fuel and air metering system for an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders, which fuel and air metering system comprises respective air intake ducts operably connected to each of the cylinders for providing air flow into the cylinders, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective tbrottle .~ .
:. . . . . .
:' ~
. .
plates pivotally positioned in each of the air intake ducts and joined together for unitary movement, means for supplying fuel to the cylinders, and means for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through the air ducts.
The invention also provides a fuel and air metering system comprising a plurality of air intake ducts operably connected to a plurality cylinders for providing air flow into the cylinders and each including a venturi section defining a throat, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective throttles positioned in each of the air intake ducts, means for supplying fuel to the cylinders, respective first pressure taps communicating with each of the venturi throats, respective second pressure taps in each of the ducts in spaced relation from the throats, a diaphragm chamber, a flexible diaphragm dividing said diaphragm chamber into a first chamber portion and a second chamber portion, means for providing fluid communication between the first chamber portion and all of the first pressure taps, means for providing fluid communication between the second chamber portion and all of the second pressure taps, and means for controlling supply of fuel to the cylinders by said fuel supply means in response to movement of the diaphragm, whereby the amount of air flow through all of the air ducts is sensed and the amount of fuel supplied to the cylinders is controlled in proportion to the amount of air flowing through all of the air ducts.
The invention also provides a fuel and air metering system comprising a plurality of air intake ducts operably . ~ . . .
. ~ , ~ , . .
.. ' ' ' ~ :
.
`:114V8Z2 connected to a plurality cylinders for poviding air flow into the cylinders and each including a venturi section defining a throat, and a tuned length, means for controlling air flow through the air intake ducts, which air flow controlling means includes respective throttles positioned in each of the air intake ducts, respective fuel injectors operably connected to each of the cylinders for injecting fuel into the cylinders, and means for supplying fuel to the fuel injectors, and means for sensing the amount of air flow through each of the air ducts and for controlling the amount of fuel supplied to the cyinders in proportion to the amount o air flowing through the air ducts, which sensing and controlling means includes respective first pressure taps communicating with each of the venturi throats and respective second pressure taps in each of the ducts in spaced relation from the throats, a diaphragm chamber, a flexible diaphragm dividing the diaphragm chamber into a first chamber portion and assecond chamber portion, means for providing fluid communication between the first chamber portion and all of the first air pressure taps, means for providing fluid communication between the second chamber portion and all of the second pressure taps, and means for controlling fuel flow to the cylinders in response to movement of the diaphragm.
Other features and advantages of the invention are set forth in the following description of a preferred embodiment, in the claims, and in the drawings.
1~4~822 BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic illustration of a fuel and air metering system embodying the invention and adapted to supply fuel and air to an internal S combustion engine.
Before explaining one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following descrip-tion or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it should be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF A PREFERRED EMBODIMENT
Illustrated in the drawings is a fuel and air metering system 10 for use in supplying fuel and air to an internal combustion engine 12, the engine 12 being schematically shown as including three in-line cylinders 14, 16 and 18. While the illustrated engine 12 has three cylinders, it will be readily appreciated by one skilled in the art that the fuel and air metering system could be incorporated with a wide variety of types of internal combustion engines and regardless of the number of cylinders employed.
~, , "
,.
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The fuel and air metering system 10 is comprised of a controller 20 adapted to be fixedly mounted to the engine block 15 and including independent air ducts 22, 24 and 26 providing separate air intake passages for supplying air to the cylinders 14, 16 and 18 respectively. Each of the air ducts 22, 24, and 26 includes a means therein for controlling air flow into the respective cylinders. While such air flow controlling means can have various constructions, in the illustrated arrangement they are comprised of pivotable throttle plates 28, 30 and 32. The throttle plates 28, 30 and 32 are each pivotably supported on a central shaft 34 which extends through the air intake passages 22, 24 and 26 of the controller 20 and bisects each of those air intake passages. In a preferred form of the invention the air ducts 22, 24 and 26 can also have a tuned length to maximize air flow into the engine at a desired engine speed to thereby maximize efficiency and power output at that speed.
The fuel and air metering system 10 also includes means for supplying fuel to the cylinders, such fuel supplying means comprising fuel injectors 36, 38 and 40. While various means can be provided for supplying fuel to the fuel injectors, as illus-trative of such means, a fuel pump 42 is employed to convey fuel through a fuel supply lir.e 44, including a flow restricting means 45, to the fuel injectors 36, 3~ and 40.
Means are also provided for controlling the amount of fuel supplied to the fuel line 44 and the ..~
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fuel injectors 36, 38 and 40 in proportion to the amount of air flowing through air ducts 22, 24, and 26. Such means includes a fuel supply control valve 46 connected to the fuel line 44, the valve 46 controlling fuel f~ow to a fuel return line or bypass 47. While the fuel control valve 46 can have various constructions, in the illustrated arrangement the fuel control valve 46 includes a reciprocal valve pin 48 having one end movable into engagement with an associated valve seat 50.
Movement of the valve pin 48 toward the valve seat 50 restricts fuel flow to the return line 47 and causes increased flow of fuel through the fuel supply conduit 44 connected to the injectors 36, 38 and 40. Other suitable means for controlling the fuel flow could comprise other means for varying the size of a fuel orifice or means for changing the delivery of the fuel pump.
The end of the movable pin 48 opposite that end engageable with the valve seat of the fuel control valve 46 is attached to a flexible diaphragm 60 which bisects a diaphragm housing 62 and forms a first diaphragm chamber 64 and a second diaphragm chamber 66. A compression spring 68 is also : ~ 25 provided for engagement with the flexible diaphragm 60 and for biasing the flexible diaphragm 60 and the valve pin 48 toward a position wherein the valve pin 48 is spaced from the valve seat 50 to permit fuel flow through the return conduit 47 thereby restricting fuel flow to the fuel injectors.
, . , . ... :
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The air passages of the air ducts 22, 24 and 26 also each include a venturi portion 52 defining a throat. First pressure sensing taps 54 are located at the venturi throats, and second pressure sensing taps 56 are located in the air passages but spaced from the venturi throats, the second pressure sensing taps 56 each generally comprising an impact tube extending into the duct.
As illustrated schematically in Fig. 1 the impact tubes 56 are connected through conduits 70, 72, 74 and 76 to the second diaphragm chamber 66, and the first pressure sensing taps are connected through similar conduits 78, 80, 82 and 84 to the first pressure sensing chamber 64 of the diaphragm housing 62.
In operation of the fuel and air flow control mechanism of the invention, rotation of the shaft 34 supporting the throttle plates 28, 30 and 32 causes variation in the amount of air flow through the air ducts 22, 24 and 26 and into the cylinders 14, 16 and 18. Due to the venturi effect, the pressure sensed at the pressure taps 54 located in the throats of the venturies 52 will be less than the pressure sensed at the impact tubes 56. Accordingly, the air pressure in the first diaphragm housing chamber 64 will be lower than the pressure in the second diaphragm housing chamber 66, and this pressure differential will increase with increased air flow velocity through the air ducts. A decrease in the pressure sensed in the first diaphragm housing chamber 64 will cause movement of the flexible diaphragm 60 to a position , ;
wherein the valve pin 48 will further restrict fuel flow through the bypass line 47 and thereby increased fuel flow to the fuel injectors 36, 38 and 40. A
decrease in the air flow velocity through tbe air ducts will cause a decrease in the pressure differ-ential sensed on the opposite sides of the flexible diaphragm 60, thereby causing the valve pin 48 to move away from the valve seat SO to thereby permit increased fuel flow through the return line 47 and to reduce the fuel flow to the injectors.
One of the advantages of the present invention is that air flow into the cylinders is provided through individual air ducts 22, 24 and 26 rather than through an intake manifold or plenem.
Because of the dynamics of the intermittent air flow into the cylinders of an internal combustion engine, it is difficult to achieve uniform flow of air to all of the cylinders if the air flows into a manifold or plenum and then into the combustion chamber of the engine. The invention provides means for eliminating the manifold and or plenum by providing separate air inlet ducts for each of the cylinders of the engine and thereby tends to equalize the quantity of air entering each cylinder and improving the engine efficiency.
Another of the advantages of tbe invention is that by providing a mechanism facilitating incorporation of separate air inlet ducts for each cylinder, the length of each of the ducts can be established so as to provide a tuned duct thereby maximizing the air flow into the engine and hence the power output of the engine at a desired engine speed.
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Another of the advantages of the invention is that by providing means for sensing the air flow through each of the ducts and by using these signals to control fuel flow to the fuel injectors, the pressure variations resulting from pulsating air flow through a single duct is minimize. If a signal from a single duct were used, the air flow through that duct would control the amount of fuel fed to the each of the cylinders. A malfunction of the cylinder fed by that duct, such as by a fouled spark plug, for example, would result in an undesir-able change in the amount of fuel supplied to the other cylinders. By providing means for conveying a signal from each of the separate air ducts to affect operation of the fuel flow control means, this disadvantage is avoided.
Various features of the invention are set forth in the following claims.
.
Claims (6)
1. A fuel and air metering system for an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders, the fuel and air metering system comprising a plurality of air intake ducts operably connected to respective cylinders for providing air flow into the cylinders and each including a venturi section defining a throat, and a tuned length, means for controlling air flow through said air intake ducts, said air flow controlling means including respective throttles positioned in each of the air intake ducts, respective fuel injectors operably connected to each of the cylinders for injecting fuel into the cylinders, and means for supplying fuel to the fuel injectors, and means for sensing the amount of air flow through each of said air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through said air ducts, said sensing and controlling means including respective first pressure taps communicating with each of said venturi throats and respective pressure taps in each of said ducts in spaced relation from said throats, a diaphragm chamber, a flexible diaphragm dividing said diaphragm chamber into a first chamber portion and a second chamber portion, means for providing fluid communication between said first chamber portion and all of said first air pressure taps, means for providing fluid communication between said second chamber portion and all of said second pressure taps, and means for controlling fuel flow to said cylinders in response to movement of said diaphragm.
2. A fuel and air metering system for an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders, the fuel and air metering system comprising respective air intake ducts operably connected to each of the cylinders for providing air flow into the cylinders, means for controlling air flow through said air intake ducts, said air flow controlling means including respective throttle plates pivotally positioned in each of the respective air intake ducts and joined together for unitary movement, means for supplying fuel to the cylinders, and means for sensing the amount of air flow through each of said air ducts and for controlling the amount of fuel supplied to the cylinders in proportion to the amount of air flowing through said air ducts.
3. A fuel and air metering system for an internal combustion engine having a plurality of cylinders and for controlling fuel and air flow to the cylinders, the fuel and air metering system comprising a plurality of air intake ducts operably connected to respective cylinders for providing air flow into the cylinders and each including a venturi section defining a throat, means for controlling air flow through said air intake ducts, said air flow controlling means including respective throttles positioned in each of the air intake ducts, means for supplying fuel to the cylinders, respective first pressure taps communicating with each of said venturi throats, respective second pressure taps in each of said ducts in spaced relation from said throats, a diaphragm chamber, a flexible diaphragm dividing said diaphragm chamber into a first chamber portion and a second chamber portion, means for providing fluid communication between said first chamber portion and all of said first pressure taps, means for providing fluid communication between said second chamber portion and all of said second pressure taps, and means for controlling supply of fuel to said cylinders by said fuel supply means in response to movement of said diaphragm, whereby the amount of air flow through all of said air ducts is sensed and the amount of fuel supplied to the cylinders is controlled in proportion to the amount of air flowing through all of said air ducts.
4. A fuel and air metering system as set forth in Claim 3 wherein said air intake ducts have a tuned length.
5. A fuel and air metering system as set forth in Claim 3 wherein said means for supplying fuel to the cylinders includes a plurality of fuel injectors operably connected to respective cylinders for injecting fuel into the cylinders, and means for supplying fuel to the fuel injectors.
6. A fuel and air metering sytem as set forth in Claim 3 wherein said air flow throttles comprise pivotable throttle plates and wherein said throttle plates are joined for unitary movement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7607879A | 1979-09-17 | 1979-09-17 | |
| US076,078 | 1979-09-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1140822A true CA1140822A (en) | 1983-02-08 |
Family
ID=22129805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000357856A Expired CA1140822A (en) | 1979-09-17 | 1980-08-08 | Fuel injection control system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5647639A (en) |
| CA (1) | CA1140822A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5740783A (en) * | 1994-12-30 | 1998-04-21 | Walbro Corporation | Engine demand fuel delivery system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4994876B2 (en) | 2006-05-19 | 2012-08-08 | 株式会社リコー | Image forming apparatus |
| JP5090827B2 (en) | 2007-09-03 | 2012-12-05 | 株式会社リコー | Image forming apparatus |
| JP2010195525A (en) * | 2009-02-25 | 2010-09-09 | Fuji Xerox Co Ltd | Recording medium conveyance device and image forming device |
-
1980
- 1980-08-08 CA CA000357856A patent/CA1140822A/en not_active Expired
- 1980-09-12 JP JP12701080A patent/JPS5647639A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5740783A (en) * | 1994-12-30 | 1998-04-21 | Walbro Corporation | Engine demand fuel delivery system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5647639A (en) | 1981-04-30 |
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