| 摘要 |
There is provided, in one aspect of the present description, an internal combustion engine system. In one example, the system comprises a controller configured to control an intake valve closing timing varying mechanism to vary a closing timing of the intake valve to regulate air charged in a combustion chamber in accordance with engine operating conditions and, in a first engine operating condition where a least volume of air is required to be charged into the combustion chamber, retard a closing timing of the intake valve to a most retarded crank angle which is after bottom dead center during a cylinder cycle and satisfies the following formulas:
± >= - 0.2685 x µ0 2 + 10.723 x µ0 + 15.815 and
µ0 >= 11.0,
where ± is the most retarded crank angle and µ0 is a geometric compression ratio of the engine. |
