CA1114694A - Method and apparatus for preparation and control of an air-fuel mixture - Google Patents
Method and apparatus for preparation and control of an air-fuel mixtureInfo
- Publication number
- CA1114694A CA1114694A CA319,308A CA319308A CA1114694A CA 1114694 A CA1114694 A CA 1114694A CA 319308 A CA319308 A CA 319308A CA 1114694 A CA1114694 A CA 1114694A
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- Canada
- Prior art keywords
- air
- fuel
- engine
- stream
- streams
- Prior art date
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Fuel-Injection Apparatus (AREA)
Abstract
ABSTRACT
Method of preparation and control of air-fuel mixture consists in that compressed air supplied by the appropriately chosen air source (1) is divided into at least two streams, whereas one of these streams with pressure taking into account the engine load and the existing at-mosphoric conditions serves for supplying and sucking of fuel and its preliminary atomization and the second for the successive atomizations of fuel, preferable connections of ejection and preventing the secondary coagulation whereas the mixture is fed to the engine suction tube (9), Where it is being mixed once more with the air sucked by the engine The device acc. to this invention has a com-pressed air source (1) connected through tube (3) to device (4), wherein tube (5) supplies compressed air through control valve (6) to the side nozzles (12) of a multi-stage atomi-zar as well as to fuel chamber (14), while the other stream is supplied through tube (18) above the central nozzle (19) provided with a needle (28) for correction of its effective cross section area.
Claim Fig. 1
Method of preparation and control of air-fuel mixture consists in that compressed air supplied by the appropriately chosen air source (1) is divided into at least two streams, whereas one of these streams with pressure taking into account the engine load and the existing at-mosphoric conditions serves for supplying and sucking of fuel and its preliminary atomization and the second for the successive atomizations of fuel, preferable connections of ejection and preventing the secondary coagulation whereas the mixture is fed to the engine suction tube (9), Where it is being mixed once more with the air sucked by the engine The device acc. to this invention has a com-pressed air source (1) connected through tube (3) to device (4), wherein tube (5) supplies compressed air through control valve (6) to the side nozzles (12) of a multi-stage atomi-zar as well as to fuel chamber (14), while the other stream is supplied through tube (18) above the central nozzle (19) provided with a needle (28) for correction of its effective cross section area.
Claim Fig. 1
Description
, ~ ' :-.. `~:
This invention relates to a method and apparatus for the preparationand control of an air-fuel mixture for engines, particularly internal combus-tion engines with spark ignition.
Those skilled in the art know from United States patent 4,159,014, issued June 26, 1979, or Canadian patent application No. 285,618, filed December 13, 1977 the methods and devices for the preparation and control of air-fuel mixtures, which are most relevant to the subject of this invention, both as far as the essence of the presented method and the practical solution of the problem set forth are concerned.
This invention seeks to provide a method and apparatus satisfying all the practical operational requirements relating to the problem of an economical feeding of the engines while increasing simultaneously the per-formance of the engine and prolonging its service life, as well as reducing the amount of the toxic compounds in the exhaust gases to trace amounts. This objective is achieved by an improvement of the methods and devices known from the state of art and, particularly, by a proper design of the control systemO
According to one aspect of the present invention there is provided a method of generating and controlling an air-fuel mixture for an engine inducing the mixture, said method comprising: providing a flow of compressed air at substantially constant pressure; controlling the volume of flow rate of said compressed air in proportion to the desired mass flow rate of the air-fuel mixture; dividing said flow of compressed air into two streams in a predetermined ratio; introducing fuel to an atomizer with a first one of said streams, in an amount depending upon flow parameters of said first stream, and initially atomizing said fuel with the air of said first stream; successively homogenizing and atomizing the fuel introduced to the atomizer with the second one of said streams to generate a preliminary air-fuel mixture for subsequent mixture with additional air induced by the engine; controlling the .
flow of said first stream according to engine operating speed and load.
The first stream may be controlled by the negative pressure under downstream of the throttle and/or by the accelerator pedal. This stream serves for supply and suction of a definite amount of fuel/fuels and its ;
initial atomization depending upon engine load, existing atmospheric conditions and the throttle position.
The second stream, which may be provided with another pressure correction system by means of the required variation or momentary reduction of the effective area of the central nozzle, serves for the successive atomizations and homogenizing of the mixture as a result of interacting of the pressure air streams flowing from the successive nozzles, for the desired correction of discharge ~cting in feedback depending upon: the stream intensities, as well as directions and cross sectional areas of the individual nozzles in the system and the pressure ratios acting in the system due to the applied control in one stream and pressure corrections in the second stream;
it is also used for elimination of secondary coagulation, by preferably deflection of the mixture stream.
The use of a pressure correction system for the second stream enables compensation of manufacturing tolerances and the degree of wear of the device, as well as an instantaneous pressure rise in order to facilitate the start of a cold engine.
~oreover, pulsation of the compressed air supplied from the air source may be eliminated by means of an automatic opening of an additional port for better pressure equalization, while pulsation of pressure for control of the pneumatic actuator is eliminated by means of an appropriate throttling of the flow, whereas compressed air supplied to the float chamber is preferably taken on the upstream side of the reduced portion of the tube.
According to another aspect of the present invention there is ... ... . .
~.q6_4 .; provided an apparatus for generating an air-fuel mixture for an engine suit-able for inducing such a mixture, said apparatus comprising: a displacement pump adapted to be driven by the engine so as to provide com~ressed air at a .volume flow rate proportional to the mass flow rate of the air-fuel mixture induced by the engine and at a substantially constant pressure; flow dividing means for dividing the air from the pump into two streams; a first passage receiving a first one of said streams and having a reduced area portion; a valve in the first passage upstream of the reduced area portion; a float chamber for containing a predetermined quantity of fuel; means connecting the float chamber to the first passage at a position upstream of said reduced portion and downstream of said valve; means connecting the reduced portion of the first passage to side nozzles of a multi-stage atomizer; means connect-ing the float chamber to the side nozzles for the supply of fuel thereto; a pneumatic actuator coupled to said valve for controlling said valve according to a pressure in an intake manifold of said engine; accelerator linkage means coupled to said valve for controlling operation of said valve in conjunction with said pneumatic actuator; a second passage receiving a second one of said streams and communicating with a central nozzle of said atomoizer; ducts in - said atomizer connecting the central nozzle to an annular slot nozzle and to ejection ports adjacent the outlets of the side nozzles so as to produce an atomizing and homogenizing action; and means for varying the open cross section of th~ central nozzle.
: The multi-stage atomizer will usually be located along the axis of the en8ine air intake upstream of the throttle, and will consist of a housing with a seat located in the device, a nozzle unit mounted on said seat and parts and seals for separation of the compressed air flowing to the side nozzles and the compressed air flowing to the central nozzle, said nozzle unit being pressed against the bottom of the seat. The atomizer further .. :, :, .. .. : , ~ ` ~
~
comprises a head with a movable needle threadably and resiliently mounted forvarying the effective cross sectional area of the central nozzle by rotation or for reducing the area momentarily by displacing the needle by means of a Bowden cable operated from the cabin.
Moreover, a recess in the nozzle unit forming an annular chamber of the slot nozzle, when pressed against the seat, is connected through suitable holes with the side nozzles, while the passage connecting the engine air intake under the throttle to the pneumatic actuator has an appropriately reduced portion, whereas in the displacement pump body (sliding) surface there are grooves leading from the outlet channel toward the upstream side of the blades within an appropriately chosen range of angles.
Moreover, when the device according to this invention is provided wit~.~a.plurality of float chambers with the necessary supplies of compressed air and with the required supplies of fuels to the individual side nozzles it is possible for the internal combustion engines to be supplied with multi-fuel mixtures, including fuels forming emulsions or solutions.
The method and apparatus according to this invention have the following advantages: practical applicability both for production as well as operational purposes, correct and full combustion of very lean mixtures that is up to ~ = 1.5 and more with trace amounts of toxic compounds in the exhaust gases, possible fulfilment of the requirements of the California test as to the purity of the exhaust gases, proper detonation-free combustion with very high compression ratios = lo and more and, at the same time, with very uniform engine running and lower thermal loads, a simple method of control of the iuel mixture and engine feeding operating automatically and taking into account the varying atmospheric conditions and depending upon the driver's operation of the accelerator pedal, as well as a simple, cheap.
and durable device, which ensures an increased engine torque and horse power , ~ : " ,, -: - . . : -: . .
' . ' ! ' :: ~$~;;;a4 ~ ~
and a smaller fuel consumption by suitable preparation of the air-fuel mixture also when it is cooperating with a standard non-adapted engine.
Embodiments of ~he present invention will now be described by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a sectional view of the apparatus;
Figure 2 is a sectional view of a mul~i-stage atomizer; and ``
Figure 3 is a sectional view of a set of nozzles.
Seen in the drawing, is a conventional source of compressed air 1 with a delivery rate suited to the requirements of the engine e.g. by throttling the flow using an orifice 2. Preferably the source 1 is a dis-placement pump driven by the engine crankshaft. The cylinder sliding surface is provided with suitable grooves directed from the outlet channel towards the upstream side of the blades within the range of angles corresponding to about ten per cent compression and produces compressed air with a uniform pressure without significant pulsations.
This compressed air is next supplied through a tube 3 directly to a device 4, wherein it is divided into two streams. One stream is supplied through tube 5 to a control valve 6, preferably in the form of a cylindrical slide in a cylindrical hole, said slide being operated by pneumatic actuator 7 connected with a tube 8 with a reduced portion to the suction tube 9 of the engine under ~he throttle valve 10, as well as with an accelerator pedal pull rod 11, in series with the throttle valve 10, in a manner depending upon engine load, atmospheric conditions and the degree of driver actuation of the accelerator pedal.
~ompressed air, the pressure of which is controlled by means of control valve 6, is supplied through a narrowed portion or tube 5 to the side nozzles 12 for the preliminary atomization of a multi-stage atomizer and through a channel 13, connected preferably upstream of the reduced . .
.'- '. . ., ... . .~
. : . - . : , - -: - : ,. . ,:
portion of tube 5 to the float chamber 14.
Fuel from the float chamber 14 flows through a passage 15 to the chamber 16 of a multi-stage atomizer, wherefrom it is supplied through channels 17 to the side nozzles ~ and is sucked and delivered into the side nozzles 12 in strictly determined amounts by the air pressure and is preliminarily atomized in said nozzles.
~ n the other hand, the second stream, which serves for the succes-sive atomizations of the mixture, the preferable correction of discharge and prevention of secondary coagulation, supplies compressed air through tube 18 connected to the multi-stage atomizer above the central nozzle 19, wherefrom compressed air is supplied through holes 20 to the chamber 21 of an annular slot nozzle 22 and through holes 23, connecting the chamber 21 to the side nozzles 12 close to their outlet. Thus, the compressed air is supplied from the central nozzle 19 to the side nozzles 12 causing a preferable deflection of the mixture stream.
The multi-stage atomizer is located along the axis of the engine suction tube 9 on the upstream side of the throttle valve 10, and provides substantially axial flow of the mixture and fitted with the atomizer for engine idle consists of a seat of the device 4 and a set of nozzles 24, representing together with the seat or a thin plate with a hole an annular slot nozzle 22, the set of nozzles being pressed above the sealing surface against the bottom of the seat through an insert 25 for the separation of the streams of compressed air and fuel by means of an annular sealing, top piece 26 and screwed-in head 27 for sealing and pressing the whole unit provided with a needle 28 fitted with suitable sealing, the needle being threadably and resiliently mounted.
The needle 28 serves to control the effective cross sectional area of the central nozzle 19 to compensate for manufacturing tolerances and wear . ., ' ~ - ,; . -: :. :, '~ . - ; . " . : . : , ., ~ , 1~4694 of the device. The needle position may be adjusted for this purpose by rotating it in its threaded mounting. The needle 28 also serves for momentary reduction of the effective cross sectional area of the central nozzle 19.
This is done by pressing against the outer end of needle 28, to advance the needle into nozzle 19 against the spring force of its resilient mounting.
The pressure on the needle is mechanically controlled by means of a Bowden cable from the driver's cab in order to facilitate the start of a cold engine.
t 7 -
This invention relates to a method and apparatus for the preparationand control of an air-fuel mixture for engines, particularly internal combus-tion engines with spark ignition.
Those skilled in the art know from United States patent 4,159,014, issued June 26, 1979, or Canadian patent application No. 285,618, filed December 13, 1977 the methods and devices for the preparation and control of air-fuel mixtures, which are most relevant to the subject of this invention, both as far as the essence of the presented method and the practical solution of the problem set forth are concerned.
This invention seeks to provide a method and apparatus satisfying all the practical operational requirements relating to the problem of an economical feeding of the engines while increasing simultaneously the per-formance of the engine and prolonging its service life, as well as reducing the amount of the toxic compounds in the exhaust gases to trace amounts. This objective is achieved by an improvement of the methods and devices known from the state of art and, particularly, by a proper design of the control systemO
According to one aspect of the present invention there is provided a method of generating and controlling an air-fuel mixture for an engine inducing the mixture, said method comprising: providing a flow of compressed air at substantially constant pressure; controlling the volume of flow rate of said compressed air in proportion to the desired mass flow rate of the air-fuel mixture; dividing said flow of compressed air into two streams in a predetermined ratio; introducing fuel to an atomizer with a first one of said streams, in an amount depending upon flow parameters of said first stream, and initially atomizing said fuel with the air of said first stream; successively homogenizing and atomizing the fuel introduced to the atomizer with the second one of said streams to generate a preliminary air-fuel mixture for subsequent mixture with additional air induced by the engine; controlling the .
flow of said first stream according to engine operating speed and load.
The first stream may be controlled by the negative pressure under downstream of the throttle and/or by the accelerator pedal. This stream serves for supply and suction of a definite amount of fuel/fuels and its ;
initial atomization depending upon engine load, existing atmospheric conditions and the throttle position.
The second stream, which may be provided with another pressure correction system by means of the required variation or momentary reduction of the effective area of the central nozzle, serves for the successive atomizations and homogenizing of the mixture as a result of interacting of the pressure air streams flowing from the successive nozzles, for the desired correction of discharge ~cting in feedback depending upon: the stream intensities, as well as directions and cross sectional areas of the individual nozzles in the system and the pressure ratios acting in the system due to the applied control in one stream and pressure corrections in the second stream;
it is also used for elimination of secondary coagulation, by preferably deflection of the mixture stream.
The use of a pressure correction system for the second stream enables compensation of manufacturing tolerances and the degree of wear of the device, as well as an instantaneous pressure rise in order to facilitate the start of a cold engine.
~oreover, pulsation of the compressed air supplied from the air source may be eliminated by means of an automatic opening of an additional port for better pressure equalization, while pulsation of pressure for control of the pneumatic actuator is eliminated by means of an appropriate throttling of the flow, whereas compressed air supplied to the float chamber is preferably taken on the upstream side of the reduced portion of the tube.
According to another aspect of the present invention there is ... ... . .
~.q6_4 .; provided an apparatus for generating an air-fuel mixture for an engine suit-able for inducing such a mixture, said apparatus comprising: a displacement pump adapted to be driven by the engine so as to provide com~ressed air at a .volume flow rate proportional to the mass flow rate of the air-fuel mixture induced by the engine and at a substantially constant pressure; flow dividing means for dividing the air from the pump into two streams; a first passage receiving a first one of said streams and having a reduced area portion; a valve in the first passage upstream of the reduced area portion; a float chamber for containing a predetermined quantity of fuel; means connecting the float chamber to the first passage at a position upstream of said reduced portion and downstream of said valve; means connecting the reduced portion of the first passage to side nozzles of a multi-stage atomizer; means connect-ing the float chamber to the side nozzles for the supply of fuel thereto; a pneumatic actuator coupled to said valve for controlling said valve according to a pressure in an intake manifold of said engine; accelerator linkage means coupled to said valve for controlling operation of said valve in conjunction with said pneumatic actuator; a second passage receiving a second one of said streams and communicating with a central nozzle of said atomoizer; ducts in - said atomizer connecting the central nozzle to an annular slot nozzle and to ejection ports adjacent the outlets of the side nozzles so as to produce an atomizing and homogenizing action; and means for varying the open cross section of th~ central nozzle.
: The multi-stage atomizer will usually be located along the axis of the en8ine air intake upstream of the throttle, and will consist of a housing with a seat located in the device, a nozzle unit mounted on said seat and parts and seals for separation of the compressed air flowing to the side nozzles and the compressed air flowing to the central nozzle, said nozzle unit being pressed against the bottom of the seat. The atomizer further .. :, :, .. .. : , ~ ` ~
~
comprises a head with a movable needle threadably and resiliently mounted forvarying the effective cross sectional area of the central nozzle by rotation or for reducing the area momentarily by displacing the needle by means of a Bowden cable operated from the cabin.
Moreover, a recess in the nozzle unit forming an annular chamber of the slot nozzle, when pressed against the seat, is connected through suitable holes with the side nozzles, while the passage connecting the engine air intake under the throttle to the pneumatic actuator has an appropriately reduced portion, whereas in the displacement pump body (sliding) surface there are grooves leading from the outlet channel toward the upstream side of the blades within an appropriately chosen range of angles.
Moreover, when the device according to this invention is provided wit~.~a.plurality of float chambers with the necessary supplies of compressed air and with the required supplies of fuels to the individual side nozzles it is possible for the internal combustion engines to be supplied with multi-fuel mixtures, including fuels forming emulsions or solutions.
The method and apparatus according to this invention have the following advantages: practical applicability both for production as well as operational purposes, correct and full combustion of very lean mixtures that is up to ~ = 1.5 and more with trace amounts of toxic compounds in the exhaust gases, possible fulfilment of the requirements of the California test as to the purity of the exhaust gases, proper detonation-free combustion with very high compression ratios = lo and more and, at the same time, with very uniform engine running and lower thermal loads, a simple method of control of the iuel mixture and engine feeding operating automatically and taking into account the varying atmospheric conditions and depending upon the driver's operation of the accelerator pedal, as well as a simple, cheap.
and durable device, which ensures an increased engine torque and horse power , ~ : " ,, -: - . . : -: . .
' . ' ! ' :: ~$~;;;a4 ~ ~
and a smaller fuel consumption by suitable preparation of the air-fuel mixture also when it is cooperating with a standard non-adapted engine.
Embodiments of ~he present invention will now be described by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a sectional view of the apparatus;
Figure 2 is a sectional view of a mul~i-stage atomizer; and ``
Figure 3 is a sectional view of a set of nozzles.
Seen in the drawing, is a conventional source of compressed air 1 with a delivery rate suited to the requirements of the engine e.g. by throttling the flow using an orifice 2. Preferably the source 1 is a dis-placement pump driven by the engine crankshaft. The cylinder sliding surface is provided with suitable grooves directed from the outlet channel towards the upstream side of the blades within the range of angles corresponding to about ten per cent compression and produces compressed air with a uniform pressure without significant pulsations.
This compressed air is next supplied through a tube 3 directly to a device 4, wherein it is divided into two streams. One stream is supplied through tube 5 to a control valve 6, preferably in the form of a cylindrical slide in a cylindrical hole, said slide being operated by pneumatic actuator 7 connected with a tube 8 with a reduced portion to the suction tube 9 of the engine under ~he throttle valve 10, as well as with an accelerator pedal pull rod 11, in series with the throttle valve 10, in a manner depending upon engine load, atmospheric conditions and the degree of driver actuation of the accelerator pedal.
~ompressed air, the pressure of which is controlled by means of control valve 6, is supplied through a narrowed portion or tube 5 to the side nozzles 12 for the preliminary atomization of a multi-stage atomizer and through a channel 13, connected preferably upstream of the reduced . .
.'- '. . ., ... . .~
. : . - . : , - -: - : ,. . ,:
portion of tube 5 to the float chamber 14.
Fuel from the float chamber 14 flows through a passage 15 to the chamber 16 of a multi-stage atomizer, wherefrom it is supplied through channels 17 to the side nozzles ~ and is sucked and delivered into the side nozzles 12 in strictly determined amounts by the air pressure and is preliminarily atomized in said nozzles.
~ n the other hand, the second stream, which serves for the succes-sive atomizations of the mixture, the preferable correction of discharge and prevention of secondary coagulation, supplies compressed air through tube 18 connected to the multi-stage atomizer above the central nozzle 19, wherefrom compressed air is supplied through holes 20 to the chamber 21 of an annular slot nozzle 22 and through holes 23, connecting the chamber 21 to the side nozzles 12 close to their outlet. Thus, the compressed air is supplied from the central nozzle 19 to the side nozzles 12 causing a preferable deflection of the mixture stream.
The multi-stage atomizer is located along the axis of the engine suction tube 9 on the upstream side of the throttle valve 10, and provides substantially axial flow of the mixture and fitted with the atomizer for engine idle consists of a seat of the device 4 and a set of nozzles 24, representing together with the seat or a thin plate with a hole an annular slot nozzle 22, the set of nozzles being pressed above the sealing surface against the bottom of the seat through an insert 25 for the separation of the streams of compressed air and fuel by means of an annular sealing, top piece 26 and screwed-in head 27 for sealing and pressing the whole unit provided with a needle 28 fitted with suitable sealing, the needle being threadably and resiliently mounted.
The needle 28 serves to control the effective cross sectional area of the central nozzle 19 to compensate for manufacturing tolerances and wear . ., ' ~ - ,; . -: :. :, '~ . - ; . " . : . : , ., ~ , 1~4694 of the device. The needle position may be adjusted for this purpose by rotating it in its threaded mounting. The needle 28 also serves for momentary reduction of the effective cross sectional area of the central nozzle 19.
This is done by pressing against the outer end of needle 28, to advance the needle into nozzle 19 against the spring force of its resilient mounting.
The pressure on the needle is mechanically controlled by means of a Bowden cable from the driver's cab in order to facilitate the start of a cold engine.
t 7 -
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of generating and controlling an air-fuel mixture for an engine inducing the mixture, said method comprising:
providing a flow of compressed air at substantially constant pressure;
controlling the volume of flow rate of said compressed air in proportion to the desired mass flow rate of the air-fuel mixture;
dividing said flow of compressed air into two streams in a predetermined ratio;
introducing fuel to an atomizer with a first one of said streams, in an amount depending upon flow parameters of said first stream, and initially atomizing said fuel with the air of said first stream;
successively homogenizing and atomizing the fuel introduced to the atomizer with the second one of said streams to generate a preliminary air-fuel mixture for subsequent mixture with additional air induced by the engine;
controlling the flow of said first stream according to engine operating speed and load.
providing a flow of compressed air at substantially constant pressure;
controlling the volume of flow rate of said compressed air in proportion to the desired mass flow rate of the air-fuel mixture;
dividing said flow of compressed air into two streams in a predetermined ratio;
introducing fuel to an atomizer with a first one of said streams, in an amount depending upon flow parameters of said first stream, and initially atomizing said fuel with the air of said first stream;
successively homogenizing and atomizing the fuel introduced to the atomizer with the second one of said streams to generate a preliminary air-fuel mixture for subsequent mixture with additional air induced by the engine;
controlling the flow of said first stream according to engine operating speed and load.
2, A method according to claim 1 wherein the flow of said first stream is controlled according to a manifold vacuum in an intake manifold of the engine and with an operator actuated control.
3. A method as claimed in claim 1, including automatically correcting the air-fuel mixture according to atomspheric conditions with said streams of compressed air.
4. A method as claimed in claim 2 wherein the predetermined flow ratio of the first stream to second stream is in the range from 10:90 to 30:70.
5. A method as claimed in claim 1 wherein pressure pulsations in the compressed air are eliminated by automatically opening suitable recesses provided in a sliding surface of a displacement pump compressing the air.
6. A method as claimed in claim 2 wherein pulsations of the manifold vacuum controlling the valve are eliminated by throttling the flow in a passage connecting a pneumatic actuator with the engine intake manifold.
7. A method as claimed in claim 2 wherein compressed air is used for supplying the fuel from a float chamber and is derived from the first stream on the upstream side of a reduced portion of a passage connecting a control valve for controlling the flow of the first stream with side nozzles of a multi-stage atomizer.
8. An apparatus for generating an air-fuel mixture for an engine suitable for inducing such a mixture, said apparatus comprising:
a displacement pump adapted to be driven by the engine so as to provide compressed air at a volume flow rate proportional to the mass flow rate of the air-fuel mixture induced by the engine and at a substantially constant pressure;
flow dividing means for dividing the air from the pump into two streams;
a first passage receiving a first one of said streams and having a reduced area portion;
a valve in the first passage upstream of the reduced area portion;
a float chamber for containing a predetermined quantity of fuel;
means connecting the float chamber to the first passage at a position upstream of said reduced portion and downstream of said valve;
means connecting the reduced portion of the first passage to side nozzles of a multi-stage atomizer;
means connecting the float chamber to the side nozzles for the supply of fuel thereto;
a pneumatic actuator coupled to said valve for controlling said valve according to a pressure in an intake manifold of said engine;
accelerator linkage means coupled to said valve for controlling operation of said valve in conjunction with said pneumatic actuator;
a second passage receiving a second one of said streams and communicating with a central nozzle of said atomizer;
ducts in said atomizer connecting the central nozzle to an annular slot nozzle and to ejection ports adjacent the outlets of the side nozzles so as to produce an atomizing and homogenizing action; and means for varying the open cross section of the central nozzle.
a displacement pump adapted to be driven by the engine so as to provide compressed air at a volume flow rate proportional to the mass flow rate of the air-fuel mixture induced by the engine and at a substantially constant pressure;
flow dividing means for dividing the air from the pump into two streams;
a first passage receiving a first one of said streams and having a reduced area portion;
a valve in the first passage upstream of the reduced area portion;
a float chamber for containing a predetermined quantity of fuel;
means connecting the float chamber to the first passage at a position upstream of said reduced portion and downstream of said valve;
means connecting the reduced portion of the first passage to side nozzles of a multi-stage atomizer;
means connecting the float chamber to the side nozzles for the supply of fuel thereto;
a pneumatic actuator coupled to said valve for controlling said valve according to a pressure in an intake manifold of said engine;
accelerator linkage means coupled to said valve for controlling operation of said valve in conjunction with said pneumatic actuator;
a second passage receiving a second one of said streams and communicating with a central nozzle of said atomizer;
ducts in said atomizer connecting the central nozzle to an annular slot nozzle and to ejection ports adjacent the outlets of the side nozzles so as to produce an atomizing and homogenizing action; and means for varying the open cross section of the central nozzle.
9. An apparatus claimed in claim 8 wherein the means for varying the open cross section of the central nozzle comprises a needle valve, means for adjusting a set position of the needle valve with respect to the central nozzle and means for temporarily displacing the needle valve with respect to the central nozzle.
10. An apparatus as claimed in claim 8, wherein the multi-stage atomizer includes elements which are shaped as bodies of revolution.
11. An apparatus as claimed in claim 8, wherein said pump includes pump blades and recesses in a cylindrical sliding surface of the pump directed towards the upstream side of blades within an angular range, said recesses being inserted before an air inlet to the pump and between the air inlet and an outlet.
12. An apparatus as claimed in claim 8, wherein passage connecting said pneumatic actuator to the intake manifold includes a portion for throttling the flow.
13. An apparatus as claimed in claim 8, including a plurality of float chambers, each connected at one side to a respective source of fuel and at a second side to a respective side nozzle of the multi-stage atomizer so as to supply a multi-fuel mixture to the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA319,308A CA1114694A (en) | 1979-01-09 | 1979-01-09 | Method and apparatus for preparation and control of an air-fuel mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA319,308A CA1114694A (en) | 1979-01-09 | 1979-01-09 | Method and apparatus for preparation and control of an air-fuel mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1114694A true CA1114694A (en) | 1981-12-22 |
Family
ID=4113272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA319,308A Expired CA1114694A (en) | 1979-01-09 | 1979-01-09 | Method and apparatus for preparation and control of an air-fuel mixture |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1114694A (en) |
-
1979
- 1979-01-09 CA CA319,308A patent/CA1114694A/en not_active Expired
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