增压柴油机EGR阶跃工况瞬态响应特性仿真分析  

Simulation Analysis of Transient Response of Turbocharged Diesel Engine Under EGR Step Change Operation

作　　者：隋菱歌[1,2] 刘忠长[1] 韩永强[1] 郑广勇[1,3] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130025 [2]长春金融高等专科学校计算机系,长春130028 [3]中国第一汽车集团公司技术中心,长春130011

出　　处：《燃烧科学与技术》2011年第4期301-307,共7页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB210003);国家自然科学基金资助项目(50976046);吉林省教育厅"十一五"科学技术研究项目(吉教科合字[2010]第259号)

摘　　要：建立了带EGR回路的增压柴油机瞬态仿真平台并验证了准确性.为了缩短EGR阶跃工况的响应时间,进行了EGR阀开度阶跃时间、开阀特性、目标EGR率等影响因素的不同控制策略的对比.结果表明,缩短EGR阀开度阶跃时间,采用"上抛型"开阀控制策略,可改善EGR流量等参数的瞬态响应特性,但会造成转矩波动增加.为减少转矩波动,提出了"综合型"EGR开阀特性控制策略,明确了不同目标EGR率的"改进综合型"控制策略函数,其EGR响应时间与"线性型"相比缩短了25%～40%,转矩波动与"上抛型"相比降低了10%～18%.A simulation platform of turbocharged diesel engine with EGR loop under transient operations was completed and verified. In order to shorten the transient response time of EGR step change operation, different control strategies for EGR step change time, EGR open valve characteristic and target EGR rate were compared. Results show that shortening EGR step change time and adopting the upcast open valve characteristic control strategies can, on the one hand, improve the transient response of EGR flow mass rate, but, on the other hand, cause torque fluctuation. To reduce torque fluctuation, a comprehensive control strategy of EGR open valve characteristic was put forward, and the improved comprehensive control strategy function of different target EGR rate was defined. Compared with the linearity control strategy, EGR transient response time is reduced by 25%-40%, and its torque fluctuation is decreased by 10%-18% compared with the upcast control strategy.

关 键 词：废气再循环 阶跃工况 瞬态响应特性 控制策略 瞬态仿真平台 增压柴油机 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]