汽车工程

汽车工程 ›› 2022, Vol. 44 ›› Issue (9): 1394-1399.doi: 10.19562/j.chinasae.qcgc.2022.09.010

所属专题： 发动机&排放专题2022年

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混动发动机在不同水温下的喷油控制策略影响试验研究

闫博文(),马天宇,蒲运平,胡铁刚,邓伟,蒋平,聂相虹   

  1. 重庆长安汽车股份有限公司动力研究院，重庆 　400000
  • 收稿日期:2022-04-22 修回日期:2022-05-05 出版日期:2022-09-25 发布日期:2022-09-21
  • 通讯作者: 闫博文 E-mail:yanbw@changan.com.cn

Experimental Study on the Effect of Fuel Injection Control Strategy Under Different Coolant Temperatures for a Hybrid Engine

Bowen Yan(),Tianyu Ma,Yunping Pu,Tiegang Hu,Wei Deng,Ping Jiang,Xianghong Nie   

  1. Powertrain Engineering R&D Center，Chongqing Changan Automobile Co. ，Ltd. ，Chongqing 　400000
  • Received:2022-04-22 Revised:2022-05-05 Online:2022-09-25 Published:2022-09-21
  • Contact: Bowen Yan E-mail:yanbw@changan.com.cn

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摘要：

基于一台长安1.5TGDI直喷混动专用发动机研究了不同水温条件下喷油策略对性能的影响，结果表明：1 000 r/min工况下，多次喷射可在30 ℃低水温下相比单次喷射实现更低油耗和碳烟排放，优势区域拓展至0.5 MPa BMEP以下，随着水温升高至50 ℃以上时，其主要在0.7 MPa BMEP以上的中高负荷工况具有更低油耗，碳烟排放则相比逐渐变差；2 000和3 000 r/min工况下，多次喷射仅在中高负荷油耗更低，且随着水温和转速增加优势逐渐减小，此外单次喷射的PN排放在中低负荷下与多次喷射相当或更优，但随着转速和负荷增加相比明显变差。由此在30 ℃低水温下，2 000和3 000 r/min可分别选取0.8和1.0 MPa BMEP以上负荷区域采用多次喷射，随着水温升高至50 ℃以上，可逐渐提升至1.0和1.3 MPa BMEP以上区域。

关键词: 混动专用发动机, 喷油策略, 水温, 油耗, 碳烟排放

Abstract:

An experimental study is conducted on a Changan 1.5TGDI dedicated hybrid engine， mainly to investigate the effect of fuel injection strategy on the performance under different coolant temperatures.The results show that under 1 000 r/min working condition， multi-injections can achieve lower fuel consumption and PN emissions than single injection， at the low coolant temperature of 30 ℃， with the advantageous area extending below 0.5 MPa BMEP. As the water temperature increases to be above 50 ℃， its fuel consumption benefit can be seen mainly at medium to high load conditions， with BMEP above 0.7 MPa， while the soot emissions become worse gradually. At 2 000 and 3 000 r/min，multiple injection shows a lower fuel consumption only under medium to high load conditions， and this advantage will be further reduced as the temperature and speed increase， in addition， the soot emission of single injection is equivalent to or better than that of multi-injections under low to medium load， but shows a significant deterioration as speed and load increase. Therefore， at the low water temperature of 30 ℃ ， for 2 000 and 3 000 r/min， multi-injections can be used at the loads greater than 0.8 and 1.0 MPa BMEP respectively. As the temperature increases to be above 50 ℃， it can be used at the loads greater than 1.0 and 1.3 MPa BMEP.

Key words: dedicated hybrid engine, fuel injection strategy, coolant temperature, fuel consumption, soot emissions