Variable compression ratio internal combustion engine
A compression ratio, internal combustion engine technology, applied in the direction of internal combustion piston engine, combustion engine, mechanical equipment, etc., can solve the problems of air-fuel ratio disorder, deterioration of exhaust performance, etc., and achieve the effect of suppressing disturbance and deterioration of exhaust characteristics.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0056] First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4 . Brief Structure of Variable Compression Ratio Internal Combustion Engine
[0057] FIG. 1 is a diagram showing a schematic configuration of a variable compression ratio internal combustion engine according to the present embodiment. In addition, the variable compression ratio internal combustion engine 1 is a multi-cylinder internal combustion engine, and FIG. 1 is a cross-sectional view showing one of the plurality of cylinders.
[0058] A variable compression ratio internal combustion engine 1 (abbreviated as internal combustion engine 1 hereinafter) includes: a cylinder block 2 with a cylinder 5 , a cylinder head 4 arranged on the top of the cylinder block 2 , and a crankcase 3 connected with a piston 6 . In addition, the cylinder block 2 is moved in the axial direction of the cylinder 5 relative to the crankcase 3 by the variable compression ratio mechanism 8, there...
Embodiment 2
[0104] Next, an embodiment of a control device for a variable compression ratio internal combustion engine according to the present invention will be described with reference to FIGS. 5 to 7 . Here, configurations different from those of the first embodiment described above will be described, and descriptions of the same configurations will be omitted.
[0105] The difference between this embodiment and the above-mentioned embodiment 1 is: the above-mentioned embodiment 1 makes the air-fuel ratio of the cylinder 5 in the intake stroke reach the best when the compression ratio changes transitionally, on the contrary, this embodiment is mainly The air-fuel ratio of the cylinder 5 in the exhaust stroke is optimized at the transition of the compression ratio change.
[0106] The intake valve 16 and the exhaust valve 17 of this embodiment are respectively driven to open and close by the variable valve mechanisms 35 and 36 . As the variable valve mechanisms 35 and 36, a mechanical ...
Embodiment 3
[0130] Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 8 and 9 .
[0131] In this embodiment, the ECU 30 executes the programs shown in FIGS. 8 and 9 instead of the program shown in FIG. 7 in the second embodiment described above.
[0132] The disturbance of the air-fuel ratio accompanying the change of the combustion chamber volume is caused by the deviation of the actual in-cylinder intake air amount from the target in-cylinder intake air amount due to the change in the residual amount of combustion gas. In Embodiment 2, although the fuel injection amount is corrected based on the actual combustion chamber volume, thereby suppressing the disturbance of the air-fuel ratio, if the actual in-cylinder intake air amount can be brought close to the target in-cylinder intake air amount, then even without adjusting the fuel injection amount Correction can also suppress disturbance of the air-fuel ratio.
[0133] In this embodiment,...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More