摘要
增压直喷技术的应用提升了动力性,改善了油耗,降低了排放,是汽油机技术发展的趋势。超级爆震是增压直喷汽油机提高低速扭矩的主要障碍。本文针对一种增压直喷汽油机超级爆震控制策略进行研究,包括超级爆震简介、爆震信号处理及超级爆震检测、超级爆震发生前控制策略及超级爆震发生后控制策略。超级爆震发生前,喷油采用三次喷射控制策略,通过一个超级爆震试验循环内单次喷射和三次喷射超级爆震发生次数对比,优化后的三次喷射喷油参数有效地降低了超级爆震的发生频率;超级爆震发生后,采用加浓混合气、限制负荷、单缸断油及关闭增压控制等控制策略,抑制超级爆震的再次发生,保证发动机安全工作。
The application of TGDI technology improves the power performance and the fuel economy, reduces the emissions, it＇s the developmental trend of gasoline engine＇s technology. Super knock is the main obstacle to improve the low-speed torque for the TGDI engine. In this paper, we study a kind of control strategy for TGDI engine＇s super knock, including super knock profile, knock signal processing and super knock detection, control strategy before and after super knock＇s occurrence. Before super knock＇s occurrence, threestage injections control strategy is adopted. By comparison with the frequency of super knock＇s occurrence with single-stage injection and three-stage injections control strategy in a super knock test cycle, the optimized parameters of three-stage injections reduce the frequency of super knock＇s occurrence effectively. After super knock＇s occurrence, the control strategy such as mixture enrichment,load limitation, fuel cut-off in single cylinder and boost control closed is adopted to inhibit the occurrence of super knock again and ensure the safety of the engine work.
作者
董立冬
万滨
张文韬
王迪
闫涛
郝伟
DONG Li-dong;WAN Bin;ZHANG Wen-tao;WANG Di;YAN Tao;HAO Wei(China FAW Group Corporation Limited,Changchun 130011,China)
出处
《内燃机与配件》
2018年第18期3-5,共3页
Internal Combustion Engine & Parts
