可变几何涡轮与压气机协同调节对柴油机瞬态性能影响的仿真研究

A Simulation Study on the Effect of Coordinated Regulation Between VGT and VGC on the Transient Performance of Diesel Engine

为解决涡轮增压柴油机加速过程中碳烟排放恶化、压气机喘振的问题,提出了可变几何涡轮和压气机协同调节的方法。利用Ricardo Wave软件对某6缸柴油机进行了定转矩加速过程的仿真,研究加速起始负荷、加速时间和VGT开度对柴油机加速过程烟度排放的影响,并对加速过程的VGT和VGC控制规律进行了初步优化。结果表明:匹配VGT的柴油机在加速过程中进行压气机的协同调节,不仅可以有效改善柴油机的碳烟排放,同时能避免压气机发生喘振。

For solving the problems of soot emission deterioration and compressor surge in the acceleration process of turbocharged engine,a coordinated regulation scheme between variable geometry turbine（VGT） and variable geometry compressor（VGC） is proposed. Ricardo Wave code is used to simulate the acceleration process of a six-cylinder diesel engine under constant torque condition for investigating the effects of initial load,acceleration time and VGT openings on the soot emission of engine in acceleration process with the control rules of VGT and VGC preliminarily optimized. The results show that the coordinated regulation of VGT and VGC can not only reduce the soot emission from diesel engine but also avoid compressor surge.