Fast Diesel Aftertreatment Heat-Up Using CDA and an Electrical Heater Between 1.2 and 5.0 kW
Fast Diesel Aftertreatment Heat-Up Using CDA and an Electrical Heater Between 1.2 and 5.0 kW
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使用 CDA 和 1.2 至 5.0 kW 的电加热器快速柴油后处理加热
DOI：
10.3389/fmech.2022.918003
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
C. Sharp
中科院分区：
文献类型：
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作者：
Bryan Zavala;J. McCarthy;A. Matheaus;C. Sharp
商用车需要快速后处理加热，以便将选择性催化还原催化剂移至最有效的温度范围，以满足即将推出的NOX法规，同时最大限度地减少二氧化碳排放。该研究是后续研究，其使用LO-SCR上游的电加热器，随后是具有配备有气缸停用的发动机的主后处理系统。本研究的重点是尽量减少最大功率输入到电子加热器，而不损害排气管的NOx和CO2。使用重型柴油发动机演示了一种系统解决方案，该发动机具有针对2027年排放水平的报废老化后处理系统，使用各种级别的控制。控制的基线层包括汽缸停用以将排气温度升高超过100°C，结合升高的怠速以增加通过后处理系统的排气质量流率。调整发动机负载以补偿发动机上产生的电力。电加热、增加的负载、停缸和提高的怠速的组合允许后处理系统在当今系统所需的一小部分时间内加热。这项工作是量化的冷联邦测试程序，热FTP，低负荷循环（LLC），和美国的饮料循环显示改善的NOX和CO2排放。在这些循环中，NOx减少和CO2节约的改进被突出显示。
Commercial vehicles require fast aftertreatment heat-up in order to move the selective catalytic reduction catalyst into the most efficient temperature range to meet upcoming NOX regulations while minimizing CO2. This study is a follow-up study using an electric heater upstream of a LO-SCR followed by a primary aftertreatment system having an engine equipped with cylinder deactivation. The focus of this study is to minimize the maximum power input to the e-heater without compromising tailpipe NOX and CO2. A system solution is demonstrated using a heavy-duty diesel engine with an end-of-life aged aftertreatment system targeted for 2027 emission levels using various levels of controls. The baseline layer of controls includes cylinder deactivation to raise the exhaust temperature more than 100°C in combination with elevated idle speed to increase the exhaust mass flow rate through the aftertreatment system. The engine load is adjusted to compensate for generating electrical power on the engine. The combination of electrical heat, added load, cylinder deactivation, and elevated idle speed allows the aftertreatment system to heat up in a small fraction of the time required by today’s systems. This work was quantified over the cold federal test procedure, hot FTP, low load cycle (LLC), and the U.S. beverage cycle showing improved NOX and CO2 emissions. The improvement in NOX reduction and the CO2 savings over these cycles are highlighted.