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A combined combustion and aftertreatment approach to achieve future emissions standards

机译：燃烧和后处理相结合的方法可达到未来的排放标准

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This paper describes the application of a systems approach to address future passenger car diesel engine requirements. To meet future emissions targets, it is necessary to minimise engine out feedgas emissions and to ensure the best interaction between in-cyclinder combustion and aftertreatment whilst providing competitive torque, power, refinement and driveability. To improve system operating ranges, a lean NOx aftertreatment system has been explored, consisting of an underfloor catalyst in series with a close coupled catalyst with controlled bypass. The use of in-cylinder post injection and other measures to improve feedgas constituents has been investigated. A detailed study of exhaust gas speciation as a function of both pilot and post in-cylinder injection timing and quantity is also summarised. The paper concludes with a system specification and calibration achieving in excess of 25percent aftertreatment conversion in drive cycle tests.
机译：本文介绍了系统方法在解决未来乘用车柴油发动机需求方面的应用。为了达到未来的排放目标，有必要最大程度地减少发动机进料中的废气排放，并确保轮内燃烧和后处理之间的最佳相互作用，同时提供具有竞争力的扭矩，功率，改进和驾驶性能。为了提高系统的运行范围，已经研究了一种稀薄的NOx后处理系统，该系统由地板下催化剂与可控旁路的密闭催化剂串联而成。已经研究了使用缸内后喷射和其他措施来改善原料气成分。还总结了对排气形态的影响，该形态是先导和后缸内喷射正时和数量的函数。本文以系统规格和校准作为结束，在行驶循环测试中，后处理转换率超过25％。

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