A novel integrated multi-physics assessment of the piston top compression ring of an internal combustion engine under normal operation mode, as well as subjected to cylinder deactivation is carried out. The methodology comprises ring-liner thermo-mixed hydrodynamics, elastodynamics of ring, as well as combustion gas blow-by and emissions. Therefore, the analysis provides prediction of ring-liner contact’s energy losses and gas power leakage across the piston and ring crevices, as well as the resulting emissions. Cylinder deactivation (CDA) technology reduces the unburnt fuel entering the ring-pack crevices, as well as the emissions. It is also shown that the frictional and gas leakage power losses are exacerbated under CDA by as much as 20%. Although this is much lower than the potential gains in fuel usage when using CDA. The optimisation of the piston compression ring would provide further fuel efficiency and improved emissions, an issue which has not hitherto received the attention which it deserves. The in-depth analysis has also shown that CDA reduces the predicted CO, NOx and HC emissions by nearly as much as 8.5%, 10% and 8.7%, respectively.

对内燃机在正常工作模式下以及气缸停用后的活塞顶压缩环进行了新颖的综合多物理场评估。该方法包括环-衬套热混合流体动力学，环的弹性动力学以及燃烧气体的窜气和排放。因此，该分析可以预测活塞环与衬套接触时的能量损失和气体功率在整个活塞和活塞环缝隙处的泄漏，以及由此产生的排放。气缸停用（CDA）技术减少了进入环组缝隙的未燃烧燃料以及排放物。还表明，在CDA下，摩擦和气体泄漏的功率损失会增加多达20％。尽管这远低于使用CDA时潜在的燃油使用收益。活塞压缩环的优化将进一步提高燃油效率并改善排放，这是迄今为止尚未受到应有重视的问题。深入分析还显示，CDA分别将预测的CO，NOx和HC排放量降低了近8.5％，10％和8.7％。