CA1054882A - Internal combustion engine equipped with dual spark plug system - Google Patents
Internal combustion engine equipped with dual spark plug systemInfo
- Publication number
- CA1054882A CA1054882A CA255,518A CA255518A CA1054882A CA 1054882 A CA1054882 A CA 1054882A CA 255518 A CA255518 A CA 255518A CA 1054882 A CA1054882 A CA 1054882A
- Authority
- CA
- Canada
- Prior art keywords
- exhaust
- combustion chambers
- engine
- cylinder head
- internal combustion
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Abstract of the Disclosure An internal combustion engine having a plurality of in-line combustion chambers, equipped with an ex-haust gas recirculation system. In each combustion chamber, two spark plugs are disposed at the opposite sides with respect to the axis passing through the center axes of the plurality of in-line combustion chambers. The cylinder head of the engine is formed with a siamesed port arrangement to supply high temperature exhaust gases into a reactor diposed down-stream of the combustion chambers.
Description
~054882 This invention relates to a multi-cylinder inter-nal combustion engine of the type wherein two spark plt~gs are disposed in each combustion chamber to ignite the charge containing recirculated exhaust gase~.
In order to lower the emission level of nitrogen oxides of spark-ignition internal combustion engines, it has been proposed to recirculate a portion of ex-haust gases into the combustion chambers of the engine to lower the maximum temperature and pressure of the combu-qtion carried out in the combustion chambers, which is called exhaust gas recirculation. This exhaust gas recirculation inevitably causes deterioration of the combustion in the combustion chambers and sometimes ignition failure. It has been further proposed for the purpose of overcoming the above shortcomings that the charge containing the exhaust gases is ignited by a plurality of spark plugs disposed in each combustion chamber wherein the burning time of the charge is short-ened since the ignition is achieved with a plurality of ignition sources located in a spaced relationship with respect to each other allowing secure and stable com-bustion of the charge in the combustion chamber.
However, it is now necessitated to further improve the combustion of the charge in the combustion chamber in order to obtain more stable combustion of the charge _ 2 - ~
lOS4882 which contributes to lowering of the emission levels of hydrocarbons and carbon monoxide. Furthermore, other measures are necessary to lower the emission levels of hydrocarbons and carbon monoxide since the emission level~ can not be lowered to desired levels by merely improving the combustion of the charge.
It is, therefore, a main object of the present in-vention to provide an improved multi-cylinder internal combustion engine capable of lowering the emission levels of nitrogen oxides, carbon monoxide and hydro-carbons to desired levels,maintaining stable operation of the engine.
Another object of the present invention is to pro-vide an improved internal combustion engine which improves the combustion of the charge containing a relatively large amount of recirculated exhaust gases by disposing two spark plugs respectively at the opposite sides of each combu~tion chamber with respect to the axis passing through the center axe~ of a plurality of nl ,ea combustion chambers.
Further object of the present invention to provide an improved multi-cylinder internal combustion engine equipped with a system carrying out the exhaust gas re-circulation and two spark plugs in each combustion chamber, wherein a so-called siamesed exhaust port , ~ 3 --'- 105488Z
~rrangement is employed to prevent the exhaust gas temperature drop . . .
in order to promote the oxidation reaction of the hydrocarbon and carbonmonoxide carried out within a reactor disposed downstream of the combustion chamber of the engine.
According to the present invention there is provided ~
multi-cylinder internal combustion engine, comprising: at least two in-line combustion chambers which are respectively formed in in-line cylinders of the engine; air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air; exhaust gas recirculating means for recircu-lating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maxim~m amount ranging from 10 to 50~ by volume of said intake air; two spark plugs disposed within each combustion chamber and respective~y at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders; a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet; and an exhaust gas purifying devic commun-icating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
The invention will now be described in more detail by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a schematical plan view of a preferred embodi-ment of a multi-cylinder internal combustion engine in accordance with the present invention; and Fig. 2 is a schematical plan view similar to Fig. 1, but showing another preferred embodiment of the invention.
Referring now to Fig. of the drawings, there is shown a ; ~ - 4 -pr~ferred embodiment of a multi-cylinder internal combustion engine in accordance with the present invention, in which the engine is gene:rally designated by the reference numeral 10. The engine of this instance is of in-line, four cylinder type and therefore the engine body 12 has four in-line combustion chamber Cl to C4 therein as is shown, each combustion chamber being defined in each engine cylinder 14 by a cylinder head 16 - 4a -an,d the crown of a piston (not shown) at top dead center. The intake port 18 of each combustion chamber i5 communicable through an intake manifold 20 with a carburetor 22 forming part of air-fuel mixture supply neans 23 which constitutes the intake system of the engine 10. The carburetor 22 is arranged to supply - the combustion chambers with an air-fuel mixture having a required air-fuel ratio. As seen, the out-lets from the two exhaust ports of the adjacent two ~,s~Lo com~bus~tiondchambers Cl and C2 or C3 and C4 are ~m-an~i within the cylinder head 16 of the engine 12 to form a so~called siameYed exhaust port 24a or
In order to lower the emission level of nitrogen oxides of spark-ignition internal combustion engines, it has been proposed to recirculate a portion of ex-haust gases into the combustion chambers of the engine to lower the maximum temperature and pressure of the combu-qtion carried out in the combustion chambers, which is called exhaust gas recirculation. This exhaust gas recirculation inevitably causes deterioration of the combustion in the combustion chambers and sometimes ignition failure. It has been further proposed for the purpose of overcoming the above shortcomings that the charge containing the exhaust gases is ignited by a plurality of spark plugs disposed in each combustion chamber wherein the burning time of the charge is short-ened since the ignition is achieved with a plurality of ignition sources located in a spaced relationship with respect to each other allowing secure and stable com-bustion of the charge in the combustion chamber.
However, it is now necessitated to further improve the combustion of the charge in the combustion chamber in order to obtain more stable combustion of the charge _ 2 - ~
lOS4882 which contributes to lowering of the emission levels of hydrocarbons and carbon monoxide. Furthermore, other measures are necessary to lower the emission levels of hydrocarbons and carbon monoxide since the emission level~ can not be lowered to desired levels by merely improving the combustion of the charge.
It is, therefore, a main object of the present in-vention to provide an improved multi-cylinder internal combustion engine capable of lowering the emission levels of nitrogen oxides, carbon monoxide and hydro-carbons to desired levels,maintaining stable operation of the engine.
Another object of the present invention is to pro-vide an improved internal combustion engine which improves the combustion of the charge containing a relatively large amount of recirculated exhaust gases by disposing two spark plugs respectively at the opposite sides of each combu~tion chamber with respect to the axis passing through the center axe~ of a plurality of nl ,ea combustion chambers.
Further object of the present invention to provide an improved multi-cylinder internal combustion engine equipped with a system carrying out the exhaust gas re-circulation and two spark plugs in each combustion chamber, wherein a so-called siamesed exhaust port , ~ 3 --'- 105488Z
~rrangement is employed to prevent the exhaust gas temperature drop . . .
in order to promote the oxidation reaction of the hydrocarbon and carbonmonoxide carried out within a reactor disposed downstream of the combustion chamber of the engine.
According to the present invention there is provided ~
multi-cylinder internal combustion engine, comprising: at least two in-line combustion chambers which are respectively formed in in-line cylinders of the engine; air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air; exhaust gas recirculating means for recircu-lating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maxim~m amount ranging from 10 to 50~ by volume of said intake air; two spark plugs disposed within each combustion chamber and respective~y at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders; a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet; and an exhaust gas purifying devic commun-icating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
The invention will now be described in more detail by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a schematical plan view of a preferred embodi-ment of a multi-cylinder internal combustion engine in accordance with the present invention; and Fig. 2 is a schematical plan view similar to Fig. 1, but showing another preferred embodiment of the invention.
Referring now to Fig. of the drawings, there is shown a ; ~ - 4 -pr~ferred embodiment of a multi-cylinder internal combustion engine in accordance with the present invention, in which the engine is gene:rally designated by the reference numeral 10. The engine of this instance is of in-line, four cylinder type and therefore the engine body 12 has four in-line combustion chamber Cl to C4 therein as is shown, each combustion chamber being defined in each engine cylinder 14 by a cylinder head 16 - 4a -an,d the crown of a piston (not shown) at top dead center. The intake port 18 of each combustion chamber i5 communicable through an intake manifold 20 with a carburetor 22 forming part of air-fuel mixture supply neans 23 which constitutes the intake system of the engine 10. The carburetor 22 is arranged to supply - the combustion chambers with an air-fuel mixture having a required air-fuel ratio. As seen, the out-lets from the two exhaust ports of the adjacent two ~,s~Lo com~bus~tiondchambers Cl and C2 or C3 and C4 are ~m-an~i within the cylinder head 16 of the engine 12 to form a so~called siameYed exhaust port 24a or
2~b having only one exhaùst outlet 25. With this ~iame~ed exhau~t port arrangement, the firing order f the cylinders iY set as Cl-C3-C4 C2 1 2 4 3 to ~equentially fire the charges in the adjacent com-bustion chambers whose exhaust ports form the siamesed exhaust port. In this case, the cylinder head 14 is formed with a cross-flow induction-exhaust arrangement wherein the intake ports 18 are formed o~ ~ e s~de of the cylinder head 16 with respect to ~ axis M-M which passed through the center axis Xc (only location is , shown) of each combuqtion chamber or of each cylinder 14, wherea~ the exhaust ports 24a and 24b are formed on the opposite side of the cylinder head 16 with respect to the axis M-M. The exhaust ports 24a and 24b communicate wi,th an exhaust gas purifying device 26 such as a reactor, forming part of the exhaust system of the engine. The device 26 functions to reduce the concentration of the no'xious constituents of the exhaust gases discharged from the combu~tion chamber~ by oxidizing the combus-tibles in the exhau~t gases. It will be understood,that the device 26 may be an exhaust manifold constructed to , ~erve a~ the reactor, or a catalytic converter. The reactor 26~ in turn, communicates through an exhaust pipe 27 and a muffler (not shown) with the atmosphereO
Within each combustion chamber, two spark plugs 28a and 28b are respectively disposed at the opposite sides with re~pect to the axis M-M. The two spark plugs 28a ! 15, and 28b are located closer to the periphery of the com-bustion chamber than the center axis Xc of the combustion chamber and symmetrically with respect to the center axis Xc.
Disposed connecting the reactor 26 and the intake manifold 20 is a conduit 30 or conduit means for re-circulating a portion of the exhaust gases passing the device 26 through the exhaust manifold 20 into the combustion chambers Cl to C4. The conduit 30 forms part of exhaust gas recirculating means 32. A control valve 34 is disposed in the conduit 30 and is arranged to control the maximum amount of the recirculated ex-hallst gases in the range from 10 to 50%, preferably 12 to 25% by volume of the intake air inducted through the intake system into the combustion chambers Cl to C4 in response, for example, to the venturi vacuum which is a function of the amount of the intake air.
With the arrangement hereinbefore discussed, two spark plugs 28a and 28b disposed within each combustion chamber causes smooth flame propagation in the combus-tion chamber to complete the combustion of the chargewithin a short period of time. As a result, stable combustion of the charge in the combustion chamber is ~chieved even if a relatively large amount of the exhaust gases, such as 12 to 25% by volume to the intake air, are recirculated into the combustion chamber, and accordingly the emission level of nitrogen oxideq (N0x) is greatly lowered.
The two spark plug~ 28a and 28b are respectively disposed at the opposite sides with respect to the axi-q M-M and located symmetrically to the center of the combustion chamber and spaced apart from the central portion of the combustion chamber. Therefore, the two spark plugs 28a and 28b respectively serve to ignite an equal volume of the charge in the combustion chamber and consequently contributes to further improvement in lOS4882 fftable combustion of the charge in the combustion chamber. In this connection, if two spark plugs are located close to each other, the above mentioned effect will not be obtained because the closed two Jpark plugs serve just as one spark plug. Additional-ly, by loca-ting the two spark plugs according to the present invention, installation and removing of the ~park plugs become easy to provide easiness in main-tenance of the spark plugs.
Since the two exhaust ports of adjacent combus-tion chambers are combined to form the so-called ~iamexed exhaust port, the inner ~urface area of the ~iame~ed exhau~t port is decreased compared with the prior art exhaust port arrangement wherein two in-dependent exhaust ports are respectively formed for two combustion chambers, and therefore the heat transfer through the inner wall of the siamesed exhaust port is decreased to prevent the temperature drop of the exhaust ga~es to be introduced to the reactor 26. In addition, since the firing order of the combustion chambers is set as to sequentially fire the adjacent combustion chambers whose exhaust ports form the siamesed exhaust port, a high temperature exhaust gases from one combus-tion chamber is introduced to the siamesed exhaust port z5 before the inner wall of the siamesed port being still . ~ .
-- 8 -- .
not cooled, preventing the exhaust gas temperature from dropping.
Accordingly, high temperature exhaust gases are introduced into the reactor 26 to promote oxidation reaction of the unburned constituents in the exhaust gases, effectively lowering the emission levels of hydrocarbons (HC) and carbon monoxide (CO).
By employing the siamesed exhaust port arrangement, the number of the outlets of the exhaust ports is decreased compared with an engine without the siamesed exhaust port arrangement and therefore the whole length of the reactor 26 communicating with the outlets 25 of the exhaust ports is allowed to sho~ten to decrease the total quantity of longitudinal thermal expansion of the reactor 26. This contributes to improvement in durability of the reactor 26 and to easiness in designing the reactor construction because of unnecessity of deep consideration to the longitudinal thermal expansion.
Furthermore, the construction of the reactor 26 is simplified and rendered compact, which lead to lowering of production cost thereof, since the number of the inlets of the reactor 26 is decreased compared with the prior art.
Fig. 2 illustrates another preferred embodiment of the multi-cylinder internal combustion engine in accordance with the present invention similar to the embodiment of Fig. 1. In this Figure, air-fuel mixture supply ~05488Z
means and exhaust gas recirculating means are omitted for the purpose of simplicity of illustration, and like reference num-erals as in Fig. 1 desiynate like parts and elements. In this case, as clearly shown, the exhaust outlet 25 of the each siamesed exhaust port 24a' or 24b' opens to the side of one section of two sections of the cylinder head 16 which are divided by each imaginery vertical plane Vp located intermediate of the adjacent two combustion chambers whose exhaust ports combined to form the siamesed port. It is to benoted that the above-mentioned one section of the cylinder head is closer to the middle point Lm of the longitudinal axis M-M of the cylinder head 16.
With this construction of the engine, the distance D between the two outlets 25 of two siamesed exhaust ports 24a' and 24b' is further shortened than in the engine seen in Fig. 1 and therefore the whole length of the reactor 26 is allowed to further decrease than in the engine in Fig. 1.
While only four-cylinder type engine has been shown and described, it will be understood that the principle of the present invention will be applied also to six or eight-cylinder type internal combustion engine.
It will be appreciated from the foregoing discussion, according to the present invention, noticeably lOS4882 stable combustion of the charge in the combustion cham-ber i8 achieved even though a considerably large amount of the exhaust gases are recirculated to the combustion chamber,by locating two spark plugs respectively at opposite sides of each combustion chamber with respect to the axis M-M. Furthermore, the temperature drop of the exhaust gases can be prevented by employing the siamesed exhaust port arrangement, contributing to simplification of the reactor construction communicating with the siamesed exhaust port. Therefore, the engine according to the principle of the invention make poqsible effectively lowering of the emission levels of NOx, CO
~nd HC without deterioration of performance character-~stics of the engine.
Within each combustion chamber, two spark plugs 28a and 28b are respectively disposed at the opposite sides with re~pect to the axis M-M. The two spark plugs 28a ! 15, and 28b are located closer to the periphery of the com-bustion chamber than the center axis Xc of the combustion chamber and symmetrically with respect to the center axis Xc.
Disposed connecting the reactor 26 and the intake manifold 20 is a conduit 30 or conduit means for re-circulating a portion of the exhaust gases passing the device 26 through the exhaust manifold 20 into the combustion chambers Cl to C4. The conduit 30 forms part of exhaust gas recirculating means 32. A control valve 34 is disposed in the conduit 30 and is arranged to control the maximum amount of the recirculated ex-hallst gases in the range from 10 to 50%, preferably 12 to 25% by volume of the intake air inducted through the intake system into the combustion chambers Cl to C4 in response, for example, to the venturi vacuum which is a function of the amount of the intake air.
With the arrangement hereinbefore discussed, two spark plugs 28a and 28b disposed within each combustion chamber causes smooth flame propagation in the combus-tion chamber to complete the combustion of the chargewithin a short period of time. As a result, stable combustion of the charge in the combustion chamber is ~chieved even if a relatively large amount of the exhaust gases, such as 12 to 25% by volume to the intake air, are recirculated into the combustion chamber, and accordingly the emission level of nitrogen oxideq (N0x) is greatly lowered.
The two spark plug~ 28a and 28b are respectively disposed at the opposite sides with respect to the axi-q M-M and located symmetrically to the center of the combustion chamber and spaced apart from the central portion of the combustion chamber. Therefore, the two spark plugs 28a and 28b respectively serve to ignite an equal volume of the charge in the combustion chamber and consequently contributes to further improvement in lOS4882 fftable combustion of the charge in the combustion chamber. In this connection, if two spark plugs are located close to each other, the above mentioned effect will not be obtained because the closed two Jpark plugs serve just as one spark plug. Additional-ly, by loca-ting the two spark plugs according to the present invention, installation and removing of the ~park plugs become easy to provide easiness in main-tenance of the spark plugs.
Since the two exhaust ports of adjacent combus-tion chambers are combined to form the so-called ~iamexed exhaust port, the inner ~urface area of the ~iame~ed exhau~t port is decreased compared with the prior art exhaust port arrangement wherein two in-dependent exhaust ports are respectively formed for two combustion chambers, and therefore the heat transfer through the inner wall of the siamesed exhaust port is decreased to prevent the temperature drop of the exhaust ga~es to be introduced to the reactor 26. In addition, since the firing order of the combustion chambers is set as to sequentially fire the adjacent combustion chambers whose exhaust ports form the siamesed exhaust port, a high temperature exhaust gases from one combus-tion chamber is introduced to the siamesed exhaust port z5 before the inner wall of the siamesed port being still . ~ .
-- 8 -- .
not cooled, preventing the exhaust gas temperature from dropping.
Accordingly, high temperature exhaust gases are introduced into the reactor 26 to promote oxidation reaction of the unburned constituents in the exhaust gases, effectively lowering the emission levels of hydrocarbons (HC) and carbon monoxide (CO).
By employing the siamesed exhaust port arrangement, the number of the outlets of the exhaust ports is decreased compared with an engine without the siamesed exhaust port arrangement and therefore the whole length of the reactor 26 communicating with the outlets 25 of the exhaust ports is allowed to sho~ten to decrease the total quantity of longitudinal thermal expansion of the reactor 26. This contributes to improvement in durability of the reactor 26 and to easiness in designing the reactor construction because of unnecessity of deep consideration to the longitudinal thermal expansion.
Furthermore, the construction of the reactor 26 is simplified and rendered compact, which lead to lowering of production cost thereof, since the number of the inlets of the reactor 26 is decreased compared with the prior art.
Fig. 2 illustrates another preferred embodiment of the multi-cylinder internal combustion engine in accordance with the present invention similar to the embodiment of Fig. 1. In this Figure, air-fuel mixture supply ~05488Z
means and exhaust gas recirculating means are omitted for the purpose of simplicity of illustration, and like reference num-erals as in Fig. 1 desiynate like parts and elements. In this case, as clearly shown, the exhaust outlet 25 of the each siamesed exhaust port 24a' or 24b' opens to the side of one section of two sections of the cylinder head 16 which are divided by each imaginery vertical plane Vp located intermediate of the adjacent two combustion chambers whose exhaust ports combined to form the siamesed port. It is to benoted that the above-mentioned one section of the cylinder head is closer to the middle point Lm of the longitudinal axis M-M of the cylinder head 16.
With this construction of the engine, the distance D between the two outlets 25 of two siamesed exhaust ports 24a' and 24b' is further shortened than in the engine seen in Fig. 1 and therefore the whole length of the reactor 26 is allowed to further decrease than in the engine in Fig. 1.
While only four-cylinder type engine has been shown and described, it will be understood that the principle of the present invention will be applied also to six or eight-cylinder type internal combustion engine.
It will be appreciated from the foregoing discussion, according to the present invention, noticeably lOS4882 stable combustion of the charge in the combustion cham-ber i8 achieved even though a considerably large amount of the exhaust gases are recirculated to the combustion chamber,by locating two spark plugs respectively at opposite sides of each combustion chamber with respect to the axis M-M. Furthermore, the temperature drop of the exhaust gases can be prevented by employing the siamesed exhaust port arrangement, contributing to simplification of the reactor construction communicating with the siamesed exhaust port. Therefore, the engine according to the principle of the invention make poqsible effectively lowering of the emission levels of NOx, CO
~nd HC without deterioration of performance character-~stics of the engine.
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A multi-cylinder internal combustion engine, comprising: at least two in-line combustion chambers which are respectively formed in in-line cylinders of the engine;
air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air;
exhaust gas recirculating means for recirculating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maximum amount ranging from 10 to 50% by volume of said intake air;
two spark plugs disposed within each combustion chamber and respectively at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders;
a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet;
and an exhaust gas purifying device communicating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air;
exhaust gas recirculating means for recirculating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maximum amount ranging from 10 to 50% by volume of said intake air;
two spark plugs disposed within each combustion chamber and respectively at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders;
a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet;
and an exhaust gas purifying device communicating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
2. A multi-cylinder internal combustion engine as claimed in claim 1, in which said cylinder head further has a cross-flow induction-exhaust arrangement wherein inlet ports communicable with the combustion chambers are formed on one side of said cylinder head with respect to said axis passing through the center axes of the cylinders, whereas said at least one combined exhaust port communicable with the combustion chambers are formed on the opposite side of said cylinder head with respect to said axis.
3. A multi-cylinder internal combustion engine as claimed in claim 1, said two spark plugs are located closer to the periphery of the combustion chamber than to the center axis of the cylinder and symmetrically with respect to the center axis of the cylinder.
4. A multi-cylinder internal combustion engine as claimed in claim 1, in which said at least two in-line combustion chambers are at least four combustion chambers which are respec-tively formed in at least four in-line cylinders of the engine, wherein at least two said exhaust outlets formed in said cylinder head open to the one side of said cylinder head.
5. A multi-cylinder internal combustion engine as claimed in claim 4, in which each exhaust outlet formed in said cylinder head opens to the side of said cylinder head at one section of two sections of said cylinder head which sections are divided by an imaginary vertical plane located intermediate of the adjacent two combustion chambers whose exhaust ports are combined, said one section being closer to the longitudinal middle of said cylinder head than the other section.
6. A multi-cylinder internal combustion engine as claimed in claim 1, further comprising means for setting the firing order of said combustion chambers such that two adjacent combustion chambers whose exhaust ports form the combined exhaust port are sequentially fired.
7. A multi-cylinder internal combustion engine as claimed in claim 1, in which said exhaust gas recirculating means includes a conduit connecting the intake and exhaust systems of the engine for introducing the exhaust gases from the exhaust system into the intake system, and control valve means disposed in said conduit means for controlling the maximum amount of the recirculated exhaust gases in the range from 10 to 50% by volume of said intake air.
8. A multi-cylinder internal combustion engine as claimed in claim 7, in which said control valve means control the maximum amount of the recirculated exhaust gases in the range from 12 to 25% by volume of said intake air.
9. A multi-cylinder internal combustion engine as claimed in claim 1, in which said exhaust gas purifying device is means for oxidizing therein the combustibles in the exhaust gases discharged from the combustion chambers.
10. A multi-cylinder internal combustion engine as claimed in claim 9, in which said oxidizing means is a reactor.
11. A multi-cylinder internal combustion engine as claimed in claim 1, in which said air-fuel mixture supply means includes a carburetor, and an intake manifold communicable between said carburetor and said combustion chambers.
12. A multi-cylinder internal combustion engine comprising: at least two in-line, combustion chambers which are respectively formed in in-line cylinders of the engine;
air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air inducted into the combustion chambers; exhaust gas recirculating means for recirculating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maximum amount ranging from 10 to 50% by volume of said intake air; two spark plugs disposed within each combustion chamber and respectively at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders, said two spark plugs being located closer to the periphery of the combustion chamber than to the center axis of the combustion chamber and symmetrically with respect to the center axis of the cylinder; a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet, and a cross-flow induction-exhaust arrangement wherein inlet ports communicable with the combustion chambers are formed on one side of said cylinder head with res-pect to said axis passing through the center axes of the cylinders, whereas said at least one combined exhaust port communicable with the combustion chambers are formed on the opposite side of said cylinder head with respect to said axis; and an exhaust gas purifying device communicating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
air-fuel mixture supply means for supplying an air-fuel mixture into the combustion chambers by mixing fuel and intake air inducted into the combustion chambers; exhaust gas recirculating means for recirculating through the intake system of the engine into the combustion chambers a portion of the exhaust gases of the engine in the maximum amount ranging from 10 to 50% by volume of said intake air; two spark plugs disposed within each combustion chamber and respectively at the opposite sides with respect to an axis which passes through the center axes of the in-line cylinders, said two spark plugs being located closer to the periphery of the combustion chamber than to the center axis of the combustion chamber and symmetrically with respect to the center axis of the cylinder; a cylinder head having therein at least one combined exhaust port wherein outlets from the two exhaust ports of adjacent combustion chambers are combined to form one exhaust outlet, and a cross-flow induction-exhaust arrangement wherein inlet ports communicable with the combustion chambers are formed on one side of said cylinder head with res-pect to said axis passing through the center axes of the cylinders, whereas said at least one combined exhaust port communicable with the combustion chambers are formed on the opposite side of said cylinder head with respect to said axis; and an exhaust gas purifying device communicating with said at least one combined exhaust port for purifying the exhaust gases by reducing the concentration of the noxious constituents in the exhaust gases discharged from the combustion chambers through said at least one combined exhaust port.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50078355A JPS521311A (en) | 1975-06-24 | 1975-06-24 | Multi-ignition engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1054882A true CA1054882A (en) | 1979-05-22 |
Family
ID=13659669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA255,518A Expired CA1054882A (en) | 1975-06-24 | 1976-06-23 | Internal combustion engine equipped with dual spark plug system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS521311A (en) |
| CA (1) | CA1054882A (en) |
| DE (1) | DE2628138A1 (en) |
| GB (1) | GB1537368A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB931751A (en) * | 1959-08-01 | 1963-07-17 | Maschf Augsburg Nuernberg Ag | Inlet channel for internal combustion engines for producing an intense rotary movement of the air in the cylinder about the longitudinal axis of the cylinder |
-
1975
- 1975-06-24 JP JP50078355A patent/JPS521311A/en active Pending
-
1976
- 1976-06-23 DE DE19762628138 patent/DE2628138A1/en not_active Withdrawn
- 1976-06-23 CA CA255,518A patent/CA1054882A/en not_active Expired
- 1976-06-24 GB GB2633276A patent/GB1537368A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2628138A1 (en) | 1976-12-30 |
| JPS521311A (en) | 1977-01-07 |
| GB1537368A (en) | 1978-12-29 |
| AU1516376A (en) | 1978-01-05 |
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