Spark ignition type internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaisuke Akihisa, Daisaku Sawada, Eiichi Kamiyama
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Abstract
An internal combustion engine provided with a variable compression ratio mechanism able to change a mechanical compression ratio and an actual compression action start timing changing mechanism able to change a start timing of an actual compression action. An amount of intake air in accordance with the required load is fed into a combustion chamber by controlling the closing timing of the intake valve, while a pressure, temperature or density in the combustion chamber at the end of a compression stroke is maintained substantially constant regardless of the engine load by controlling the mechanical compression ratio.
Claims30
A method of controlling a mechanical compression ratio by a variable compression mechanism and controlling a closing timing of an intake valve by a variable valve timing mechanism in a spark ignition type internal combustion engine, the mechanical compression ratio changes by changing a combustion chamber volume, the closing timing of an intake valve being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber, wherein the mechanical compression ratio is controlled so that the pressure in the combustion chamber at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
A method of controlling a mechanical compression ratio by a variable compression mechanism and controlling a closing timing of an intake valve by a variable valve timing mechanism in a spark ignition type internal combustion engine, the mechanical compression ratio changes by changing a combustion chamber volume, the closing timing of the intake valve being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber, wherein the mechanical compression ratio is controlled so that the temperature of the gas in the combustion chamber at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
A method of controlling a mechanical compression ratio by a variable compression mechanism and controlling a closing timing of an intake valve by a variable valve timing mechanism in a spark ignition type internal combustion engine, the mechanical compression ratio changes by changing a combustion chamber volume, the closing timing of the intake valve being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber, wherein target values of the pressure in the combustion chamber and gas temperature at the end of the compression stroke are stored in advance, and the mechanical compression ratio is controlled so that the pressure in the combustion chamber and gas temperature at the end of the compression stroke become the stored target values.
A method of controlling a mechanical compression ratio by a variable compression mechanism and controlling a closing timing of an intake valve by a variable valve timing mechanism in a spark ignition type internal combustion engine, the mechanical compression ratio changes by changing a combustion chamber volume, the closing timing of the intake valve being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber, wherein the mechanical compression ratio is controlled so that the density of gas in the combustion chamber at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
Dependencies are inferred from the claim text.