增压直喷低压EGR发动机GPF再生效率研究

宁成钢¹，孙孟祥¹，张家瑞²，刘勇¹，朱文武¹，王东²，郭俊德^2*

1.江铃汽车股份有限公司，江西 南昌  330200；2.西安工业大学机电工程学院，陕西 西安  710021

摘要：为提高某增压、直喷、低压废气再循环（low-pressure exhaust gas recirculation，LP-EGR）、米勒循环汽油机颗粒捕集器（gasoline particulate filter，GPF）的再生效率，优化GPF再生控制策略，并进行城市工况和城郊工况下的GPF再生试验验证。试验结果表明：将混合动力控制单元（hybrid control unit，HCU）作为GPF再生的关联控制器，由HCU控制再生过程，城市工况、城郊工况下的实际再生碳量较优化前分别提高了10%和15%，有效解决了混合动力车辆在这两种工况下GPF不易再生及再生效率较低的问题。

关键词：混合动力车辆；增压直喷；米勒循环；HCU；LP-EGR；GPF

GPF regeneration efficiency of a turbocharged direct injection low-pressure EGR engine

NING Chenggang¹, SUN Mengxiang¹, ZHANG Jiarui², LIU Yong¹, ZHU Wenwu¹, WANG Dong², GUO Junde^2*

1.Jiangling Motors Co., Ltd., Nanchang 330200, China;

2.School of Mechatronic Engineering, Xi′an Technological University, Xi′an 710021, China

Abstract: In order to improve the regeneration efficiency of the gasoline particulate filter (GPF) in a turbocharged, direct injection, and low-pressure exhaust gas recirculation (LP-EGR) Miller cycle engine of a full hybrid electric vehicle, the GPF regeneration control strategy is optimized, and verified by regeneration tests under urban and suburban conditions. The experimental results show that using a hybrid control unit (HCU) as the associated controller for GPF regeneration, with the HCU controlling the regeneration process, the actual regeneration carbon content in urban and suburban conditions increases by 10% and 15% respectively compared to before optimization. The new GPF regeneration control strategy can effectively solve the problem of difficult GPF regeneration and low regeneration efficiency of GPF for full hybrid electric vehicle in these two conditions.

Keywords: full hybrid electric vehicle; supercharging direct injection; Miller cycle; HCU; LP-EGR; GPF