Spark ignition type internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaisuke Akihisa, Daisaku Sawada, Eiichi Kamiyama, Yukihiro Nakasaka
Life of this patent
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Abstract
An engine provided with a variable timing mechanism (B) able to control a closing timing of an intake valve (7) and a variable compression ratio mechanism (A) able to change a mechanical compression ratio and controlling the closing timing of the intake valve (7) to control the amount of intake air fed into a combustion chamber (5). To obtain an output torque in accordance with the required torque even when the atmospheric pressure changes, when the atmospheric pressure falls, the closing timing of the intake valve (7) is made to approach intake bottom dead center and the mechanical compression ratio is reduced.
Claims19
A spark ignition type internal combustion engine provided with
- a variable timing mechanism able to control a closing timing of an intake valve and
- a variable compression ratio mechanism able to change a mechanical compression ratio and controlling the closing timing of the intake valve to control the amount of intake air fed into a combustion chamber, wherein
- the closing timing of the intake valve is caused to approach intake bottom dead center when the atmospheric pressure falls and
- the mechanical compression ratio is reduced, when the atmospheric pressure falls or the atmospheric temperature rises, so that an output torque in accordance with a required torque is obtained even when the atmospheric pressure changes.
Dependencies are inferred from the claim text.