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US 8,136,489 B2Granted
Variable compression ratio internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsEiichi Kamiyama, Daisuke Akihisa
Life of this patent
Estimating the term…
Abstract
In a variable compression ratio internal combustion engine that controls the compression of an internal combustion engine by changing the volume of the combustion chamber of the internal combustion engine in an axial direction of the cylinder, when a target compression ratio (εt) based on an operating condition of the internal combustion engine is at a reference compression ratio (ε0) or greater (S102), the compression ratio is changed to the target compression ratio (S103). When the target compression ratio (εt) is lower than the reference compression ratio (ε0) (S102), a control is executed to change the compression ratio and also to strength the tumble flow in the combustion chamber (S104).
Claims35
A variable compression ratio internal combustion engine, comprising:
- a variable compression ratio mechanism that changes a volume in a combustion chamber of the internal combustion engine in the axial direction of a cylinder by changing a relative position between a cylinder head and a piston of the internal combustion engine when the piston is positioned at a top dead center to control a compression ratio of the internal combustion engine;
- and
- a tumble flow strength controller that controls a strength of tumble flow in the combustion chamber, wherein
- a squish area is formed between the cylinder head and the piston in accordance with a height of the combustion chamber,
- the tumble flow strength controller controls the strength of the tumble flow in the combustion chamber according to the compression ratio controlled by the variable compression ratio mechanism, and
- the tumble flow strength controller increases the strength of the tumble flow as the compression ratio decreases.
3 more elements
A variable compression ratio internal combustion engine, comprising:
- a variable compression ratio mechanism that changes a volume in a combustion chamber of the internal combustion engine in the axial direction of a cylinder by changing a relative position between a cylinder head and a piston of the internal combustion engine when the piston is positioned at a top dead center to control a compression ratio of the internal combustion engine;
- and
- a tumble flow strength controller that controls a strength of tumble flow in the combustion chamber, wherein
- a squish area is formed between the cylinder head and the piston in accordance with a height of the combustion chamber,
- the tumble flow strength controller controls the strength of the tumble flow in the combustion chamber according to the compression ratio controlled by the variable compression ratio mechanism, and
- the tumble flow strength controller strengthens the tumble flow if the compression ratio is below a prescribed compression ratio.
3 more elements
A variable compression ratio internal combustion engine, comprising:
- a variable compression ratio mechanism that changes a volume in a combustion chamber of the internal combustion engine in the axial direction of a cylinder by changing a relative position between a cylinder head and a piston of the internal combustion engine when the piston is positioned at a top dead center to control a compression ratio of the internal combustion engine;
- and
- a tumble flow strength controller that controls a strength of tumble flow in the combustion chamber, wherein
- a squish area is formed between the cylinder head and the piston in accordance with a height of the combustion chamber,
- the tumble flow strength controller controls the strength of the tumble flow in the combustion chamber according to the compression ratio controlled by the variable compression ratio mechanism, and
- the tumble flow strength controller strengthens the tumble flow if the compression ratio is below a prescribed compression ratio and an engine load of the internal combustion engine is below a prescribed load.
3 more elements
A variable compression ratio internal combustion engine, comprising:
- a variable compression ratio mechanism that changes a volume in a combustion chamber of the internal combustion engine in the axial direction of a cylinder by changing a relative position between a cylinder head and a piston of the internal combustion engine when the piston is positioned at a top dead center to control a compression ratio of the internal combustion engine;
- and
- a tumble flow strength controller that controls a strength of tumble flow in the combustion chamber, wherein
- a squish area is formed between the cylinder head and the piston in accordance with a height of the combustion chamber,
- the tumble flow strength controller controls the strength of the tumble flow in the combustion chamber according to the compression ratio controlled by the variable compression ratio mechanism, and
- the tumble flow strength controller strengthens the tumble flow if the compression ratio is below a prescribed compression ratio or if the compression ratio is above a further prescribed compression ratio.
3 more elements
A variable compression ratio internal combustion engine, comprising:
- a variable compression ratio mechanism that changes a volume in a combustion chamber of the internal combustion engine in the axial direction of a cylinder by changing a relative position between a cylinder head and a piston of the internal combustion engine when the piston is positioned at a top dead center to control a compression ratio of the internal combustion engine;
- and
- a tumble flow strength controller that controls a strength of tumble flow in the combustion chamber, wherein
- a squish area is formed between the cylinder head and the piston in accordance with a height of the combustion chamber,
- the tumble flow strength controller controls the strength of the tumble flow in the combustion chamber according to the compression ratio controlled by the variable compression ratio mechanism, and
- if the compression ratio is below a prescribed compression ratio, the tumble flow controller increases the strength of the tumble flow as the compression ratio decreases, and if the compression ratio is above a further prescribed compression ratio, the tumble flow controller increases the strength of the tumble flow as the compression ratio increases.
3 more elements
Dependencies are inferred from the claim text.