不同米勒循环方式对柴油机工作过程影响的一维模拟分析

doi:10.13229/j.cnki.jdxbgxb20171078

吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (5): 1444-1454.doi: 10.13229/j.cnki.jdxbgxb20171078

不同米勒循环方式对柴油机工作过程影响的一维模拟分析

杨帅^1,2, 冯志炜¹, 赵治国¹, 周毅¹

1.同济大学汽车学院,上海 201804;
2.同济大学中德工程学院,上海 201804

收稿日期:2017-07-28 出版日期:2018-09-20 发布日期:2018-12-11
通讯作者: 赵治国(1971-)男,教授,博士.研究方向:混合动力汽车系统集成控制,新型传动系统控制及车辆动力学控制.E-mail:zhiguozhao@tongji.edu.cn
作者简介:杨帅(1980-),男,副教授,博士.研究方向:发动机控制与排放技术.E-mail:mermaid04@126.com
基金资助:
国家自然科学基金项目(5167050371);上海市技术性贸易措施应对专项项目;中央高校基本科研业务费专项资金资助交叉学科项目;同济大学课程建设实验教改项目;同济大学教学改革项目;同济大学精品实验项目;同济大学研究生综合教改项目

1-Dimensional simulation analysis about the influence of different Miller cycle strategies on diesel engine operating process

YANG Shuai^1,2, FENG Zhi-wei¹, ZHAO Zhi-guo¹, ZHOU Yi¹

1.School of Automotive Studies, Tongji University, Shanghai 201804, China;
2.Chinesisch-Deutsche Hochschule für Angewandte Wissenschaften, Tongji University, Shanghai 201804, China;

Received:2017-07-28 Online:2018-09-20 Published:2018-12-11

摘要/Abstract

摘要： 基于柴油机的工作模型,运用-维模拟分析了进气门早关和晚关两种米勒循环形式对柴油机燃烧和排放的影响,通过改变气门正时、增压压力和喷油正时,在两种米勒循环方式下对该型柴油机在额定转速下的工作状态进行了优化。实验结果表明,推迟或者提前进气门关闭时刻可以减小压缩阶段的压力和温度,从而使滞燃期增长,但是由于缸内工质的减少,缸内平均温度和碳烟排放升高;增压压力的提高可以弥补进气损失,进气门晚关或者早关并结合提高增压压力及推迟喷油,可同时降低NO_x和碳烟的排放;在保持爆发压力与原机相同时,M-50配合定爆发压力与上止点前10 °CA喷油的方案相对于原机其油耗下降1.21%,NO_x排放下降22%,碳烟下降58.1%,M100配合定爆发压力与上止点前12 °CA喷油的方案相对于原机其油耗下降1.56%,NO_x下降12.96%,碳烟下降54.75%。

关键词: 内燃机工程, 米勒循环, 柴油机, 一维模拟, 排放

Abstract: Based on the working model of a diesel engine, the influences of two Miller cycle strategies, Early Intake Valve Closure (EIVC) and Late Intake Valve Closure (LIVC) on the combustion and emissions of diesel engine were analyzed by 1-Dimensional simulation. Then, the working condition of each Miller cycle strategy on the engine under the rated speed was optimized through the adjust of the valve timing, the boost pressure and the injection timing. It was found that both delaying and advancing the closure timing of the intake valve can decrease the pressure and temperature during compression stroke, prolonging the ignition delay. However, due to the decrease of the working media inside the cylinder, the average in-cylinder temperature and soot emission increase, which can be alleviated by raising the boost pressure and the resulting compensation of the intake air loss. The study also found that together with increasing boost pressure and delaying injection timing, both EIVC and LIVC can reduce NO_x and soot emission simultaneously. The simulation results show that while keeping the peak firing pressure the same as the original engine, M-50 together with constant peak firing pressure boosting and a 6 °CA injection delay can decrease the Fuel Consumption (FC) by 1.21%, and NO_x emission by 22%, and soot emission by 58.1%, while M100 together with constant peak firing pressure boosting and a 4 °CA injection delay can reduce the FC by 1.56%, and NO_x emission by 12.96%, and soot emission by 54.75%.

Key words: internal-combustion engine engineering, Miller cycle, diesel engine, 1-Dimensional simulation, emission

中图分类号:

TK422

杨帅, 冯志炜, 赵治国, 周毅. 不同米勒循环方式对柴油机工作过程影响的一维模拟分析[J]. 吉林大学学报(工学版), 2018, 48(5): 1444-1454.

YANG Shuai, FENG Zhi-wei, ZHAO Zhi-guo, ZHOU Yi. 1-Dimensional simulation analysis about the influence of different Miller cycle strategies on diesel engine operating process[J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(5): 1444-1454.

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不同米勒循环方式对柴油机工作过程影响的一维模拟分析

1-Dimensional simulation analysis about the influence of different Miller cycle strategies on diesel engine operating process

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