Transport sector is within a profound changing period, but diesel engines are still called to play a significant role in future supported on their solid share in many regions and superior thermal efficiency compared to spark-ignited engines. This work identifies the parameters that most affect fuel consumption and NO_x emissions on a diesel passenger car equipped with a lean NO_x trap under different driving cycles and ambient temperatures. High average vehicle velocity was beneficial to reduce the fuel consumed per kilometer. The driving dynamics was of little importance, easily counteracted by a higher thermal efficiency, higher engine temperature (because of a longer trip) or/and an efficient gear shifting strategy. Moreover, at low ambient temperature the latter two factors doubled their weight on fuel economy. Regarding tailpipe NO_x, keeping high aftertreatment performance was crucial. For this, low engine-out NO_x emissions were four times more important than exhaust temperature or flow rate.

运输行业正处于一个深刻的变化时期，但是柴油发动机在许多地区的稳固份额以及与火花点火式发动机相比出色的热效率，仍被认为在未来起着重要作用。这项工作标识的参数最能影响燃油消耗和NO _X配备有贫NOx柴油轿车的排放量_X在不同的行驶周期和环境温度下会被捕集。高平均车速有利于减少每公里的燃料消耗。行驶动力学的重要性不高，可以通过更高的热效率，更高的发动机温度（由于更长的行程）或/和高效的换挡策略来抵消。此外，在较低的环境温度下，后两个因素使它们的燃油经济性增加了一倍。至于排气管NO _X，保持高后处理性能是至关重要的。为此，低发动机排出的NO _X排放量四倍排气温度更重要或流速。