DPF机内再生的控制策略研究  

Research on Control Strategy of DPF Marchine Regeneration

作　　者：段旭东 姬凯凯 DUAN Xudong;JI Kaikai(Department of Automobile Technology,Sichuan Vocational and Technical College,Suining 629000,China;United Automotive Electronic Systems,Liuzhou Branch,Liuzhou 545000,China)

机构地区：[1]四川职业技术学院汽车技术学院,四川遂宁629000 [2]联合汽车电子有限公司柳州分公司,广西柳州545000

出　　处：《四川职业技术学院学报》2023年第4期157-163,共7页Journal of Sichuan Vocational and Technical College

基　　金：四川职业技术学院自然科学一般项目“喷油策略对正丁醇、PODE掺混柴油燃料燃烧和排放的影响”(2022YZB010)。

摘　　要：柴油机的后处理系统需要缸内后喷射以实施定期主动再生,而后喷射通常是基于查表法的前馈控制来实现的,但基于查表法的后喷射控制需要大量的校准工作以保持.因此,我们提出通过缸压反馈来控制后喷射,为了优化控制策略,基于一台轻型柴油机,研究后喷定时与排放之间的关系,以及利用燃烧分析推导出放热率最大值L_(HRRmax)位置后的燃烧速率;使用最大放热率后的燃烧速率S_(LHRRmax)和主喷油量确定出放热率最大值位置后燃烧X%的质量分数对应的燃烧相位.根据燃烧相位确定的曲轴转角来反馈调节最佳的近后喷定时,可以实现再生时排放较低的控制效果.The after-treatment system of a diesel engine requires in-cylinder post-injection to implement periodic active regeneration,which is usually achieved by feed-forward control based on the look-up table method,but the control of post-injection based on the look-up table method requires a lot of calibration work to maintain.Therefore,we propose to control the after-injection by cylinder pressure feedback.To optimize the control strategy,we investigate the relationship between after-injection timing and emissions based on a light-duty diesel engine,as well as derive the combustion rate after the position of the exothermic rate maximum L_(HRRmax) using combustion analysis;the mass fraction of X% of combustion after the position of the exothermic rate maximum is determined using S_(LHRRmax) and the main injection volume corresponding combustion phase.The crankshaft rotation angle determined from the combustion phase is used to adjust the optimal near-rear injection timing with feedback,and a lower emission control effect during regeneration can be achieved.

关 键 词：后喷 主动再生 后处理 燃烧放热率 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]