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首页> 外文会议>RWTH Aachen University;RWTH Aachen University;Aachen colloquium automobile and engine technology >Contribution of Low Voltage Diesel Mild Hybridization and Novel Exhaust After- Treatment Systems in the Context of Future Post EU6 RDE and CO_2 Requirements
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Contribution of Low Voltage Diesel Mild Hybridization and Novel Exhaust After- Treatment Systems in the Context of Future Post EU6 RDE and CO_2 Requirements

机译：低压柴油温和杂交和新型废气后处理系统在未来邮政邮政局和CO_2要求的背景下的贡献

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摘要

Future CO_2 reduction and post EU6 emission requirements will drive the electrificationof all combustion engine powertrains for passenger cars and light commercial vehiclesforward significantly. For diesel engines, this general trend, which is especially prevalentin Europe, will lead to greater stress on the overall system complexity and cost.Alongside the well-established, high voltage hybridizations of gasoline engines, a costoptimized, low voltage technology for diesel engines is currently a very promising pathto combine powertrain efficiency, driving performance and emission control at an acceptablecost level. One promising technology strategy is a mild hybrid P0 applicationcoupled with an advanced exhaust aftertreatment (EA T) system including lean NOxtrap (LNT) technology that can form the standard for next generation powertrain technologyin 2021 at EU6d and beyond. The technical potential of such a strategy is summarizedin the first part of the paper, shown exemplarily on an existing C-segmentdemonstrator vehicle targeting ambitious real driving emissions (RDE) requirements.In the second part of this paper, a predictive investigation explores the functional performancebenefits of an alternative technology strategy for pre-selected advanced hybridarchitectures, P2, P4 and a combined P1+P4 layout, using a computer aidedengineering (CAE) approach. It looks at different mildly hybridized diesel powertrainarchitectures in interaction with an electrically heated catalyst (EHC) in a tailored buthigh-performance exhaust aftertreatment system. Different concepts of 48V mild hybridizationare applied to a representative, generic D-segment passenger car in a modularCAE environment. Combined innovative operation strategies of both powertrainand exhaust aftertreatment are set up in order to meet future, ambitious real drivingconditions legislation, focusing on nitrous oxides (NOx) and carbon dioxide (CO_2) includingcold start and short urban driving conditions. The post EU6 RDE scenario considersmore challenging driving conditions to demonstrate robust NOx-control withpriority towards inner city, low speed and low load driving conditions on a level of<=40 mg/km. A key challenge is an exemplary low load driving cycle (LLC) close to theborderline of current RDE boundary conditions characterized by v*a_pos, relative positiveacceleration (RPA) and minimum average vehicle speed (v_mean). The CAE resultsindicate that advanced, mild hybridization technology, characterized by theposition of the electric motor(s) (EM) downstream of the internal combustion engine(ICE) of diesel powertrains, shows high optimization potential for both costumer-relevantfuel efficiency and driving performance improvement with even further improved robustness for meeting low-level NOx-emission targets. A key element of P2- and P4-layouts is the functionality of limited, pure electric driving in ultra-low speed conditions.This enhanced functionality is not offered with the P0 architecture due to a very limitedtorque assist functionality for the ICE. Considering a combined EM strategy (e.g.P1+P4) in combination with an automatic transmission, an additional functionality ofcombined series and parallel hybrid operation strategy is enabled. This powertrain operationmode shows the overall highest potential for NOx-emission robustness downto extremely low speed and low load driving conditions. Considering fuel efficiency andNOx-control requirements a novel, physical model based, powertrain control logic withclosed loop control was developed. An additional synergetic effect in combination withmild hybrid electric vehicle (MHEV) powertrain technology is the electrified aftertreatmentsystem, which can increase NOx-robustness for ultra-low load city cycle scenariosas well. In particular, the application of a 48V electrically heated oxidation catalyst(eDOC) is considered. Finally, the predictive results of combined CO_2 and NOx improvementinvestigations indicate a highly beneficial contribution of tailored, low voltageMHEV applications towards mid-term 95 g/km CO_2 and post EU6 RDE Noxrequirements. The model based CAE approach enabled the wide screening, optimizationand control of the complex powertrains in an effective and robust manner.
机译：未来的CO_2减少和后EU6排放要求将推动电气化乘用车和轻型商用车的所有燃烧发动机发电机向前迈进。对于柴油发动机，这一普遍趋势尤其普遍在欧洲，将导致整体系统复杂性和成本的压力更大。除了汽油发动机的完善，高压杂交，成本柴油发动机的优化，低压技术目前是一个非常有前途的道路将动力总成效率，驱动性能和排放控制结合在可接受的情况下成本水平。一个有前途的技术策略是一种轻度混合P0应用程序再加上先进的排气后处理（EA T）系统，包括瘦NOx陷阱（LNT）技术可以形成下一代动力总成技术的标准在2021年在欧盟6d及以后。总结了这种策略的技术潜力在纸张的第一部分中，示例性地显示在现有的C段上示威车辆瞄准雄心勃勃的实际驾驶排放（RDE）要求。在本文的第二部分，预测调查探讨了功能性能用于预先选择的高级混合动力车的替代技术策略的好处建筑，P2，P4和组合的P1 + P4布局，使用计算机辅助工程（CAE）方法。它看起来不同的温和杂交的柴油动力总成在量身定制的情况下与电加热催化剂（EHC）相互作用的结构高性能排气后处理系统。不同概念48V轻度杂交适用于模块化的代表，通用D段乘用车CAE环境。综合动力总成的创新运行策略建立了排气后处理，以满足未来，雄心勃勃的真正驾驶条件立法，聚焦氧化亚氮（NOx）和二氧化碳（CO_2），包括冷启动和短都市驾驶条件。邮政eu6 RDE方案考虑更具挑战性的驾驶条件，以展示强大的NOx控制优先于内部城市，低速和低负载驾驶条件<= 40毫克/公里。关键挑战是靠近的示例性低负载驾驶循环（LLC）当前RDE边界条件的边界，其特征在于V * A_POS，相对阳性加速度（RPA）和最小均线车速（V_mean）。 CAE结果表明先进，轻度杂交技术，其特征在于内燃机下游电动机（EM）的位置柴油机的（冰）显示了顾客相关的高优化潜力燃料效率和驾驶性能提高，甚至进一步提高了满足低水平NOx排放目标的鲁棒性。 p2和p4-的关键要素布局是在超低速度条件下有限，纯电动驱动的功能。由于非常有限，P0架构不提供此增强功能扭矩辅助冰的功能。考虑合并的EM策略（例如P1 + P4）与自动变速箱组合，额外的功能组合系列和并行混合操作策略已启用。这种动力制品操作模式显示NOx排放稳健性的总体最高潜力以极低的速度和低负载驾驶条件。考虑燃油效率和NOx-Control要求基于电动机控制逻辑的新颖，物理模型开发了闭环控制。额外的协同效果与温和的混合动力电动车（MHEV）动力总成技术是电气化的后处理系统，可以增加超低负荷城市周期场景的NOx稳健性也是。特别地，施加48V电加热氧化催化剂（EDOC）被认为是。最后，CO_2组合的预测结果和NOx改善调查表明量身定制，低电压的高度有益贡献MHEV应用于中期95克/ km co_2和eu6 rde nox要求。基于模型的CAE方法启用了宽筛选，优化并以有效且稳健的方式控制复杂的电力。

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