Abstract Diesel engine cylinder deactivation (CDA) has been demonstrated to provide significant efficiency and aftertreatment thermal management benefits, enabling fuel-efficient emissions reduction from modern diesel engines at low load engine operation. Dynamic cylinder activation (DCA), a variant of CDA where the set of deactivated cylinders varies on a cycle-by-cycle basis, has been demonstrated to enable greater control over driveline torsional vibration while maintaining the fuel efficiency and thermal management benefits shown by fixed CDA via appropriate design of firing patterns. A model-based algorithmic approach to designing firing patterns during DCA – to control driveline torsional vibration in a user-defined frequency range, given firing density, engine speed, and maximum length of firing pattern – is described in this article. The described algorithm is generalizable to any engine configuration including different piston–cylinder layouts and number of cylinders. The algorithm is extended to design firing patterns for constrained DCA operation when CDA hardware is installed on a subset of cylinders of the engine. The resulting optimal firing patterns using the algorithm, for various combinations of inputs, are presented through an experimentally-validated simulation framework and discussed. It is demonstrated that the weighted phase-angle approach can accurately predict the frequencies and relative amplitudes of the vibration content, and, if theoretically possible, the proposed algorithm determines firing patterns that meet the specified requirements. The presented algorithm can be easily extended in future work for simultaneous selection of firing density and firing pattern during online, real-time implementation during both steady-state and transient operating conditions.

中文翻译：

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基于模型的柴油机振动监控动态点火模式设计

摘要 柴油发动机汽缸停用 (CDA) 已被证明可提供显着的效率和后处理热管理优势，使现代柴油发动机在低负荷发动机运行时能够降低燃油效率。动态汽缸启用 (DCA) 是 CDA 的一种变体，其中停用汽缸组在逐个循环的基础上发生变化，已被证明可以更好地控制传动系扭转振动，同时保持固定燃油效率和热管理优势CDA 通过适当设计点火模式。本文介绍了一种在 DCA 期间设计点火模式的基于模型的算法方法——在用户定义的频率范围内控制传动系扭转振动，给定点火密度、发动机转速和点火模式的最大长度。所描述的算法可推广到任何发动机配置，包括不同的活塞-气缸布局和气缸数量。当 CDA 硬件安装在发动机的气缸子集上时，该算法被扩展为设计受约束的 DCA 操作的点火模式。对于各种输入组合，使用该算法得到的最佳点火模式通过实验验证的模拟框架呈现并进行讨论。结果表明，加权相角方法可以准确预测振动内容的频率和相对幅度，并且，如果理论上可能，所提出的算法确定满足指定要求的点火模式。