Device and method for controlling internal combustion engine...

F - Mech Eng,Light,Heat,Weapons – 02 – D

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F02D 13/02 (2006.01) F02D 15/02 (2006.01)

Patent

CA 2550430

A control device for controlling an engine, comprising a variable lift mechanism capable of changing the lift of a valve and a variable compression ratio mechanism capable of changing a compression ratio in a combustion chamber. The control device controls the variable lift mechanism and the variable compression ratio mechanism so that, when a requested engine output is increased, a compression ratio decreasing rate is increased over a lift increasing rate and, when the requested engine output is reduced, a lift decreasing rate is increased over a compression ratio increasing rate. When the engine comprises a variable phase mechanism capable of changing the phase of the valve, the control device controls the variable compression ratio mechanism and the variable phase mechanism so that, when the requested engine output is increased, the compression ratio decreasing rate is increased over the change rate of the phase to a delay angle and, when the requested engine output is reduced, the change rate of the phase to an advance angle is increased over the compression ratio increasing rate. Thus, the contact of the valve with a piston can be avoided.

L'invention concerne un dispositif de commande destiné à réguler un moteur, qui comprend un mécanisme de levage variable susceptible de modifier la levée d'une soupape et un mécanisme de rapport de compression variable susceptible de modifier un rapport de compression dans une chambre de combustion. Le dispositif de commande régule les mécanismes de levée variable et de rapport de compression variable de sorte que, lorsqu'une puissance de moteur requise augmente, un taux de diminution du rapport de compression augmente par rapport à un taux d'augmentation de la levée et, si la puissance du moteur requise est réduite, un taux de diminution de levée augmente par rapport à un taux d'augmentation du rapport de compression. Si le moteur comprend un moteur à phase variable susceptible de modifier la phase de la soupape, le dispositif de commande régule le mécanisme de rapport de compression variable et le mécanisme à phase variable de sorte que, si la puissance du moteur requise augmente, le taux de diminution du rapport de compression augmente par rapport au taux de changement de la phase d'un angle de retard et, si la puissance du moteur requise se réduit, le taux de changement de la phase à un angle d'avance augmente par rapport au taux d'augmentation du rapport de compression. Ainsi, on peut éviter le contact de la soupape avec un piston.

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