Effects of LP-EGR and Electric Charger Synergy on Performance of Gasoline Direct Injection Engine
-
摘要: 在一款采用废气涡轮增压的直喷汽油机上，进行了电动增压器和低压废气再循环(Low pressure exhaust gas recirculation，LP-EGR)技术组合对发动机经济性、NOx排放特性以及动力性、EGR率瞬态响应特性影响的试验研究。结果表明：电增压工作时，低速外特性EGR率可达到25%，使得1 250~2 000 r/min外特性的燃烧相位提前，油耗相对于电增压不工作时下降8.5%~10%，同时NOx排放显著降低；而在部分负荷工况下，电增压的泵吸作用使得最大EGR率大于30%，取得了油耗和NOx排放同时改善的综合效果，且最高油耗下降率可达10.8%；此外电增压工作时，1 500 r/min下负荷从0.2 MPa增大到1.5 MPa的瞬态响应时间缩短2/3；当发动机定转速加大负荷运行时，电增压工作时进气歧管目标EGR率的建立时间可缩短1.3 s，有效优化了发动机加速过程的运转控制参数。Abstract: In this paper, an electric supercharger was installed on a GDI gasoline engine with LP-EGR system. The engine performance and emission changes were experimentally investigated by combining the electric supercharger technology and EGR. Meanwhile, the transient responses of dynamic and EGR rate also were discussed. The results show that the EGR rate could reach 25% at WOT and low speed with electric charger working. That led to the optimization of combustion phase at 1 250~2 000 r/min. The fuel consumption declined by 8.5%~10%, and NOx emission also lowered observably. And at partial load, the maximum EGR rate were higher than 30% with the pumping effect of electric charger. That caused fuel consumption and NOx emission simultaneously improve, and the maximum decreasing rate of fuel consumption could be 10.8%. In addition, with electric charger working, the transient response time would be contracted by 2/3 from 0.2 MPa to 1.5 MPa at 1 500 r/min. When engine was accelerated working, the built-up time of EGR rate in intake manifold could contracted 1.3 s with electric charger working.
-
Key words:
- electric supercharger /
- LP-EGR /
- rate of fuel consumption /
- NOx emission /
- transient response
-
表 1 发动机主要结构参数
结构及技术参数 指标 缸径 74.5 mm 行程 85.9 mm 排量 1.498 L 压缩比 12.5 额定功率 96 kW 额定转速 5 500 r/min 峰值转矩 200 N·m/(1 400~4 000 r/min) 进气增压方式 电子增压与废气涡轮增压 涡轮增压器压气机流量 439.2 kg/h 涡轮增压器涡轮机流量 0.012 3 kg/s 喷射压力 350 bar 排气歧管 集成式水冷排气歧管 
下载: 导出CSV
表 2 电动增压器主要技术参数
技术参数 指标 驱动电压 48 V 响应时间 300 ms 最大功率 5.0 kW 转速 0~700 00 r/min 压比 1.45 [-] 最大流量 300 kg/h
下载: 导出CSV
表 3 试验仪器及技术参数
试验仪器 精度 Kistler缸压传感器 < 0.5% 电力测功机 ±10 r/min AVL动力测试台架 ±1.25 Nm 空气流量计 1% 热电偶温度传感器 0.3%
下载: 导出CSV
表 4 试验研究工况
转速/(r·min-1) 负荷/MPa 电动增压器工作状态 1 250 外特性 工作/不工作 1 500 外特性 工作/不工作 2 000 外特性 工作/不工作 3 000 外特性 工作/不工作 4 000 外特性 工作/不工作 1 500 0.8, 1.1, 1.4 工作/不工作 2 000 0.8, 1.1, 1.4 工作/不工作
下载: 导出CSV
-
[1] HUA Z G, ZHENG Z X, PÉRA M C, et al. Remaining useful life prediction of PEMFC systems based on the multi-input echo state network[J]. Applied Energy, 2020, 265: 114791 doi: 10.1016/j.apenergy.2020.114791 [2] 林歆悠, 伍家鋆, 魏申申. 双电机耦合驱动电动汽车驱动模式划分与优化[J]. 汽车工程, 2020, 42(4): 424-430 https://www.cnki.com.cn/Article/CJFDTOTAL-QCGC202004003.htmLIN X Y, WU J Y, WEI S S. Division and optimization of driving modes of electric vehicles with dual-motor coupling-propulsion powertrain[J]. Automotive Engineering, 2020, 42(4): 424-430 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-QCGC202004003.htm [3] 冯浩, 林思聪, 陈泓, 等. 稀燃及废气再循环提高增压汽油机热效率的对比研究[J]. 内燃机工程, 2020, 41(1): 36-41 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG202001007.htmFENG H, LIN S C, CHEN H, et al. A comparison of using lean burn and exhaust gas recirculation to improve thermal efficiency of a turbocharged gasoline engine[J]. Chinese Internal Combustion Engine Engineering, 2020, 41(1): 36-41 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG202001007.htm [4] 刘海军, 侯献军, 陈贵升, 等. 高原环境下柴油机可变两级增压协同主喷定时的工作过程模拟[J]. 内燃机工程, 2020, 41(1): 27-35 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG202001006.htmLIU H J, HOU X J, CHEN G S, et al. Simulation of working process of diesel engine equipped with regulated two-stage turbocharger system coordinated with main injection timing strategy at plateau[J]. Chinese Internal Combustion Engine Engineering, 2020, 41(1): 27-35 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG202001006.htm [5] TRAN H H, RICHARD B, GRAY K, et al. Developing a performance specification for an electric supercharger to satisfy a range of downsized gasoline engine applications[C]//SAE 2016 World Congress and Exhibition. New York: SAE International, 2016 [6] 曾契, 沈凯, 刘新续, 等. 低压EGR对GDI增压汽油机外特性下性能和排放影响[J]. 内燃机工程, 2018, 39(2): 43-47 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201802007.htmZENG Q, SHEN K, LIU X X, et al. Effect of LP EGR on performance and emissions of a turbocharged GDI engine at full load[J]. Chinese Internal Combustion Engine Engineering, 2018, 39(2): 43-47 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201802007.htm [7] 黄昭明, 沈凯, 安宗权, 等. 不同压缩比米勒循环和低压废气再循环对增压直喷汽油机性能影响[J]. 内燃机工程, 2019, 40(4): 13-18 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201904003.htmHUANG Z M, SHEN K, AN Z Q, et al. Effects of miller cycle of different compression ratios and low pressure EGR on performance of turbocharged gasoline direct injection engine[J]. Chinese Internal Combustion Engine Engineering, 2019, 40(4): 13-18 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201904003.htm [8] 郭红松, 苏万华, 孙田. 利用PLIEF技术研究超高压燃油喷雾雾化和混合过程[J]. 燃烧科学与技术, 2007, 13(6): 525-531 doi: 10.3321/j.issn:1006-8740.2007.06.009GUO H S, SU W H, SUN T. Fuel atomization and mixing under ultra-high injection pressure by using planar laser induced exciplex fluorescence technique[J]. Journal of Combustion Science and Technology, 2007, 13(6): 525-531 (in Chinese) doi: 10.3321/j.issn:1006-8740.2007.06.009 [9] 曾契, 沈凯, 张振东, 等. 高/低压EGR对汽油机和增压器影响的试验研究[J]. 内燃机工程, 2018, 39(4): 33-38 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201804007.htmZENG Q, SHEN K, ZHANG Z D, et al. Investigation on effects of low and high pressure EGR on GDI engine and its turbocharger[J]. Chinese Internal Combustion Engine Engineering, 2018, 39(4): 33-38 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201804007.htm [10] 董天普, 张付军, 刘波澜. EGR对涡轮增压柴油机瞬态特性的影响[J]. 内燃机学报, 2017, 35(2): 118-124 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJX201702004.htmDONG T P, ZHANG F J, LIU B L. Effect of EGR on transient characteristics of turbocharged diesel engine[J]. Transactions of CSICE, 2017, 35(2): 118-124 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJX201702004.htm [11] AN B, SUZUKI H, EBISU M, et al. Development of two-stage turbocharger system with electric supercharger[C]//Proceedings of the FISITA 2012 World Automotive Congress. Berlin: Springer, 2013: 147-155 [12] KATRAŠNIK T, MEDICA V, TRENC F. Analysis of the dynamic response improvement of a turbocharged diesel engine driven alternating current generating set[J]. Energy Conversion and Management, 2005, 46(18-19): 2838-2855 doi: 10.1016/j.enconman.2005.03.001 [13] KATRAŠNIK T, RODMAN S, TRENC F, et al. Improvement of the dynamic characteristic of an automotive engine by a turbocharger assisted by an electric motor[J]. Journal of Engineering for Gas Turbines and Power, 2003, 125(2): 590-595 doi: 10.1115/1.1563246 [14] 许为亮, 李乐, 喻凡, 等. 汽车发动机电动增压技术研究[J]. 传动技术, 2017, 31(1): 14-17, 40 doi: 10.3969/j.issn.1006-8244.2017.01.003XU W L, LI L, YU F, et al. Research of the electric supercharger technology of vehicle engine[J]. Drive System Technique, 2017, 31(1): 14-17, 40 (in Chinese) doi: 10.3969/j.issn.1006-8244.2017.01.003 [15] 姚春德, 刘小平, 周红秀, 等. 电动增压器减少柴油机加速烟度的试验[J]. 机械工程学报, 2008, 44(4): 118-122 https://www.cnki.com.cn/Article/CJFDTOTAL-JXXB200804023.htmYAO C D, LIU X P, ZHOU H X, et al. Using electric supercharger to reduce smoke emission from diesel engine at acceleration process[J]. Chinese Journal of Mechanical Engineering, 2008, 44(4): 118-122 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JXXB200804023.htm [16] 师文洁, 宋康, 谢辉. 电辅助涡轮增压器对柴油机热效率调控规律的研究[J]. 内燃机工程, 2018, 39(5): 58-65 https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201805009.htmSHI W J, SONG K, XIE H. Study on regulation of thermal efficiency of diesel engine equipped with electrically assisted turbocharger[J]. Chinese Internal Combustion Engine Engineering, 2018, 39(5): 58-65 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NRJG201805009.htm -
点击查看大图
图(14) / 表(4)
计量
- 文章访问数: 113
- HTML全文浏览量: 112
- PDF下载量: 21
- 被引次数: 0
