孙山峰，谢辉，耿宗起，左兰，陈秀梅.48V起动发电一体式电机提升发动机排温的试验研究[J].内燃机工程,2021,42(6):17-22.
48V起动发电一体式电机提升发动机排温的试验研究
Study on Increasing Exhaust Temperature by Using 48V Belt-Driven Starter Generator
DOI：10.13949/j.cnki.nrjgc.2021.06.003
关键词:起动发电一体式电机  发动机  排温  选择性催化还原  起燃温度
Key Words:belt-driven starter generator(BSG)  engine  exhaust temperature  selective catalyst reduction（SCR）  light-off temperature
基金项目:
作者单位
孙山峰，谢辉，耿宗起，左兰，陈秀梅 1.天津大学 内燃机燃烧学国家重点实验室，天津 300072；2.潍柴动力股份有限公司，潍坊 261061 
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摘要:基于48V起动发电一体式电机(belt-driven starter generator， BSG)的起动机和发电机双重功能，在全球轻型车测试循环(world light-duty test cycle， WLTC)起始阶段，控制BSG电机行使发电功能，在飞轮端输出功率不变的条件下提升发动机总功率，从而快速提升排气温度；利用BSG电机的快速起动功能，在WLTC循环的怠速工况关闭发动机，避免出现低温排气流，从而起到后处理保温作用。结果显示，在WLTC循环过程中，涡轮后排温达到选择性催化还原系统起燃温度(预设为200℃)的时间由780s缩短到650s，尿素喷射起喷时刻提前了约130s；同时在荷电状态略微下降的条件下，WLTC循环油耗降低2.4%。
Abstract:Based on the starter and generator function of 48V belt-driven starter generator(BSG), the generator function of BSG system was used to increasing engine exhaust temperature during world light-duty test cycle(WLTC). The engine exhaust temperature was increased by increasing the overall engine power while maintaining the same crankshaft output torque. By using the starter function, the engine could be shut off during idle period to keep after-treatment system warm. Finally, the time to reach the temperature of selective catalyst reduction lighting-off was shortened from 780s to 650s, and the timing of urea injection was 130s ahead. Meanwhile, the overall fuel consumption of WLTC was reduced by 2.4% with a slight decrease of state of charge.
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