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AssigneeNissan Motor Co., Ltd.
InventorsKenji Suzuki, Ryouichi Ootaki, Yukiyo Yamada, Masashi Ono, Hiroshi Takada
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An internal-combustion engine includes a variable compression ratio mechanism for changing a mechanical compression ratio, and a variable valve timing mechanism for changing the valve timing of an intake valve. When acceleration is demanded, a target compression ratio is set to a lower compression ratio than the target value in a normal condition, and the valve timing is set to the advance angle side. Since the allowable combustion pressure decreases in a prescribed intermediate compression ratio region, if an actual compression ratio exists in the prescribed intermediate compression ratio region in the course of a compression ratio change accompanying acceleration, the variable compression ratio mechanism restricts the intake pressure by increasing a degree of opening of a wastegate valve or reducing a degree of opening of a throttle valve, for example.
A control method for an internal combustion engine including a variable compression ratio mechanism that is composed of a multi-link type piston crank mechanism, and is structured to vary a mechanical compression ratio of the internal combustion engine, and has tolerance against combustion pressure wherein the tolerance is relatively low in a middle compression ratio region between a maximum compression ratio and a minimum compression ratio, the control method comprising:
A control device for an internal combustion engine, the control device comprising:
Dependencies are inferred from the claim text.