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Multipoint ignition engine

An engine, multi-point technology, applied in the direction of engine ignition, engine components, combustion engines, etc., can solve the problems of wasteful discharge of fuel, increase in the amount of HC and CO, and deterioration of emission performance, to improve output and fuel efficiency, suppress effect of loss

Active Publication Date: 2007-09-12
MIYAMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, no less than 8% of the fuel is discharged wastefully
Also, the amount of HC and CO discharged in the exhaust gas increases, thereby deteriorating the emission performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] FIG. 1 shows a schematic construction of a multi-point ignition engine 1 according to the invention.

[0038] In the present embodiment, the engine 1 is a premixed engine in which the fuel injected through an injector connected to the intake port not shown in the figure is uniformly mixed with the air, and when the air-fuel mixture is introduced into the combustion chamber 2, the The spark ignites and burns. In order to obtain the desired air-fuel ratio, the amount of intake air and the amount of fuel injected by the injectors are adjusted. As will be described below, the engine 1 may be a direct injection engine. To improve fuel efficiency, the air-fuel ratio of the air-fuel mixture is set higher than the stoichiometric air-fuel ratio (for example, an excess air factor of about 2), but ensures that the output of the engine 1, the air-fuel mixture The air-fuel ratio is set to be equal to or less than (richer) the air-fuel ratio depending on the operating region or sto...

no. 2 approach

[0078]In order to further improve the output and fuel efficiency of the above-mentioned multi-point ignition engine 1 , the compression ratio of the engine 1 can be increased by reducing the thickness of the cylinder head gasket 15 . As the compression ratio increases, thermal efficiency increases, resulting in improved output and fuel efficiency. However, when the thickness of the cylinder head gasket 15 is reduced, the distance between the peripheral spark gap 13 and components such as the cylinder head 3 is reduced, resulting in an increased possibility of leakage. Leakage often occurs especially when the thickness of the cylinder head gasket 15 is set to 6 mm or less. This also happens when the capacitance of the ignition coil increases.

[0079] In the second embodiment, as shown in FIGS. 7 and 8 , leak-proof recesses 23 , 24 are formed by forming leak-proof recesses 23 , 24 at positions corresponding to positions in the circumferential direction of the upper peripheral ...

no. 3 approach

[0083] In order to suppress leakage from the peripheral spark gap 13 into the cylinder head 3 and the like, the third embodiment differs from the first embodiment in the structure of the peripheral electrode pair 12 . All other structures are the same as those of the first embodiment.

[0084] FIG. 11 shows the structure of the peripheral electrode pair 12 according to the third embodiment. The portion of the peripheral electrode pair 12 exposed inside the combustion chamber 2 has the form of a linear rod without a curved portion in the middle. Further, it is formed by making the tip end surface of one of the electrodes (ground electrode 12b) constituting the peripheral electrode pair 12 face the tip end-side sideface of the other electrode (conductive electrode 12a) with a gap therebetween. Peripheral spark gap 13. The angle formed by the exposed parts of the electrodes 12a, 12b is substantially 90°.

[0085] With this structure, since there is no bent portion in the middl...

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PUM

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Abstract

A multipoint ignition engine (1) includes a central electrode pair (9), disposed in the center of a combustion chamber (2), for forming a central spark gap (10), and a plurality of peripheral electrode pairs (12) held in a head gasket (15), which has an opening portion having a substantially identical diameter to an opening portion of a cylinder (5) in a position corresponding to the opening portion of the cylinder (5), for forming a plurality of peripheral spark gaps (13) around the inner periphery of the opening portion in the cylinder (5). An air-fuel mixture in the combustion chamber (2), which is obtained by mixing together fuel and air evenly to the stoichiometric air-fuel ratio or a richer / leaner air-fuel ratio than the stoichiometric air-fuel ratio, is ignited using both the central spark gap (10) and the plurality of peripheral spark gaps (13).

Description

technical field [0001] The present invention relates to a multipoint ignition engine having multiple spark gaps in a single combustion chamber. Background technique [0002] In a spark ignition engine, the air-fuel mixture in the combustion chamber is ignited by a spark plug, and typically, the spark plug is ideally attached to the center of the combustion chamber. When ignition is performed at the center, the resulting flame spreads concentrically from the center to the periphery. [0003] However, as the flame reaches the periphery, it is cooled by the combustion chamber wall surfaces and may thus be extinguished. If the flame goes out, the unburned gases are exhausted through the exhaust valve. When the excess air ratio is, for example, about 1.7, the fuel concentration of the air-fuel mixture in the cylinder is about 90,000ppm, and when the flame is extinguished in the peripheral portion, the amount of hydrocarbons discharged in an unburned state during light-load oper...

Claims

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Application Information

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IPC IPC(8): F02P15/08H01T13/46
CPCY02T10/46Y02T10/125
Inventor 南克明
Owner MIYAMA
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