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Variable compression ratio internal combustion engine

A technology of internal combustion engine and compression ratio, applied in internal combustion piston engine, combustion engine, fuel system, etc., can solve the problem of obtaining engine performance and so on

Inactive Publication Date: 2007-09-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a dual-fuel system, the compression ratio of the internal combustion engine is fixed, and there is no optimization of the compression ratio for the two cases of using gasoline as fuel and hydrogen as fuel, and thus, it is sometimes difficult to use both fuels. get enough engine performance

Method used

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  • Variable compression ratio internal combustion engine
  • Variable compression ratio internal combustion engine
  • Variable compression ratio internal combustion engine

Examples

Experimental program
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Effect test

no. 1 example

[0045] The internal combustion engine 1 to be described below is a variable compression ratio internal combustion engine in which the compression ratio is changed by moving the position of the cylinder block 3 having the cylinder 2 in the direction of the central axis of the cylinder 2 relative to the crankcase 4 in which the piston and the crankcase 4 Associated.

[0046] First, the structure of a variable compression ratio internal combustion engine according to the present embodiment will be described with reference to FIG. 1 . As shown in FIG. 1, the cylinder block 3 has a plurality of protrusions formed on both lower sides thereof, each protrusion having a bearing receiving hole 5 formed therein, the bearing receiving hole 5 being cylindrical and vertical Extends in the axial direction of the cylinder 2 and parallel to the arrangement direction of the plurality of cylinders 2 . The bearing receiving holes 5 are arranged coaxially on one side, and a pair of axes of the be...

no. 2 example

[0081] A second embodiment of the present invention will be described below. In the second embodiment, a description is made regarding the compression ratio control of an internal combustion engine 1 equipped with a hydrogen fuel injection valve 26 for injecting hydrogen as fuel into the intake port 16, and The direct-injection hydrogen fuel injection valve 33 is used to directly inject hydrogen as fuel into the cylinder 2 .

[0082]FIG. 7 is a cross-sectional view showing the detailed structure of the internal combustion engine 1 of the present invention. In this embodiment, a direct injection type hydrogen fuel injection valve 33 is provided on the top wall of the combustion chamber of the internal combustion engine 1 . The direct-injection hydrogen fuel injection valve 33 is connected to a direct-injection hydrogen supply pipe 34 . The other end of the direct injection hydrogen supply pipe 34 is connected with the hydrogen supply pipe 29 . In the middle of the direct inj...

no. 3 example

[0090] A third embodiment of the present invention is described below. In the third embodiment, a control will be described in which when the internal combustion engine 1 uses hydrogen as fuel and the NO of the internal combustion engine 1 X Emissions greater than limit NO X When the emission amount is exceeded, the air-fuel ratio is made leaner or richer according to the air-fuel ratio of the internal combustion engine 1 at that time, and the compression ratio is lowered to reduce NO X emissions. The detailed structure of this internal combustion engine 1 is the same as that shown in Fig. 3, and thus its description is omitted.

[0091] FIG. 8 is a graph showing the air-fuel ratio and NO in the internal combustion engine 1 when hydrogen is used as fuel. X A graph of the relationship between emissions. As shown in Figure 8, when hydrogen is used as fuel, NO X Emissions increased and at one point reached their peak. And as the air-fuel ratio further changes to the rich si...

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PUM

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Abstract

The invention is directed to a variable compression ratio internal combustion engine in which the compression ratio of the engine can be varied and multiple types of fuels having different combustion velocities are used. The invention provides a technology for achieving excellent engine performance for respective types of fuels. In the variable compression ratio internal combustion engine in which the compression ratio can be varied and multiple types of fuels having different combustion velocities are injected through multiple fuel injection valves, maps from which a target compression ratio of the internal combustion engine is read out are switched in accordance with the fuel used, thereby suppressing knocking or other disadvantages.

Description

technical field [0001] The present invention relates to a variable compression ratio internal combustion engine in which the compression ratio of the internal combustion engine can be changed, and more particularly, the present invention relates to a variable compression ratio internal combustion engine using a plurality of fuels having different combustion velocities. Background technique [0002] In recent years, in order to improve the fuel mileage, power and other performances of the internal combustion engine, a technique of making the compression ratio of the internal combustion engine variable has been proposed. In technologies that have been proposed, such as those disclosed in Japanese Patent Application Laid-Open Nos. 7-26981 and 2003-206771, a cylinder block and a crankcase are connected in a movable manner relative to each other, and a camshaft is provided between them. to move the cylinder block and crankcase towards / away from each other with the rotation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/04F02D19/06F02B75/04
CPCF02B2201/064F02B2275/16F02D19/0628F02D19/0615F02D35/023Y02T10/123F02D19/061Y02T10/36F02D19/0689F02D2250/36F02D15/04F02D19/0692F02D41/3094F02D41/0025F02D37/02F02B75/041F02D19/0644F02B2275/14F02B69/02Y02T10/12Y02T10/30
Inventor 神山荣一
Owner TOYOTA JIDOSHA KK
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