为了确定内燃机运动机构最佳动力学特性的停缸方案,建立某V8柴油机曲轴系统、正时齿轮和配气机构柔性动力学耦合仿真模型,通过试验进行相应模型的校核.进行不同单缸停缸方案的运动机构动力学仿真.结果表明,停缸后曲轴角位移幅值明显增加,且以低谐次滚振为主；凸轮轴角位移无明显变化,但配气机构运动特性恶化,机械负荷增大.选择曲轴单双结点振型结点位置附近的气缸,在柴油机高速低负荷时停缸,运动机构动力学特性较好.%In order to confirm cylinder deactivation schemes with preferable dynamic performances of internal combustion engine motion mechanisms, the flexible dynamic model of a V8 diesel engine was established, which coupled mechanisms such as cranktrain, timing-gears, and valvetrain. The dynamic models were validated by experimental data. Motion mechanisms dynamic simulations were conducted for single cylinder deactivation. The results revealed that angular displacement amplitude of crankshaft obviously increased when single cylinder activated, which mainly consisted of low orders rolling vibration, while the change to camshaft was negligible. Motion characteristics of valvetrain were deteriorated and mechanical load increased. Deactivated cylinders which were neighboring to the single or double crunodes positions of crankshaft, behaved better dynamic performances under high speed and low engine loads.
展开▼
