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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >TRANSIENT EGR IN A LONG-ROUTE AND SHORT-ROUTE EGR-SYSTEM
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TRANSIENT EGR IN A LONG-ROUTE AND SHORT-ROUTE EGR-SYSTEM

机译：长途和短途EGR系统中的瞬态EGR

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摘要

The use of EGR to lower NO_x-emissions from Diesel engines is a well-documented method. Recently, more and more research is done on alternative EGR routing systems such as long-route EGR. To reach future emission legislation goals it is not sufficient to focus on steady-state driving. The emission peaks during the transient parts of driving cycles are gaining importance. It is therefore interesting to analyze the EGR-flow in transients for different configurations of the EGR system.rnIn this work, a 1-D simulation is performed in GT-Power for a Euro 4 passenger car diesel engine equipped with cooled short-route EGR and a variable geometry turbine. For calibration of the simulation, load transients were measured including the measurement of transient EGR-rates using a fast CO_2-analyzer and cylinder pressure to obtain heat-release data. While the transient heat-release rates are used as an input for the combustion-simulation, the EGR response measurements are used as a reference for calibration of the EGR-system and its components.rnA long route EGR system and a short-route EGR system are then simulated and compared, focusing on transient response, availability of EGR during the transient and the fuel consumption in steady state.rnIt is shown that the long-route system has advantages in both steady-state and transient driving conditions. In steady state it can decrease fuel consumption, in transient it can provide EGR without negative effect on the transient response.
机译：使用EGR降低柴油机的NO_x排放量是一个有据可查的方法。最近，对诸如长途EGR的替代EGR路由系统进行了越来越多的研究。为了达到未来的排放法规目标，仅关注稳态驱动是不够的。在行驶周期的过渡部分，排放峰值变得越来越重要。因此，对于不同的EGR系统配置，分析瞬态中的EGR流量是很有趣的。在这项工作中，在GT-Power中对配备冷却的短程EGR的Euro 4乘用车柴油机进行了一维仿真。和可变几何涡轮机。为了校准仿真，测量了负载瞬变，包括使用快速CO_2分析仪和气缸压力测量瞬态EGR率，以获得放热数据。瞬态放热率用作燃烧模拟的输入，而EGR响应测量值用作EGR系统及其组件校准的参考。n长途EGR系统和短途EGR系统然后对它们进行仿真和比较，重点是瞬态响应，瞬态期间EGR的可用性以及稳态时的燃油消耗。rn表明，长途系统在稳态和瞬态驾驶条件下均具有优势。在稳态下，它可以减少燃油消耗；在瞬态下，它可以提供EGR，而对瞬态响应没有负面影响。

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