基于某两级涡轮增压柴油车扭矩波动问题分析

Analysis of Torque Fluctuation of a Two-stage Turbocharged Diesel Vehicle

两级涡轮增压器通过气道阀门开关,在发动机不同转速下实现不同的气体流动方式,以满足发动机全转速范围的增压压力要求,提高车辆不同工况的加速性。本文通过改真空系统的设计,提高真空系统的容积,解决了采用两级涡轮增压器的柴油车辆在路试中产生的扭矩波动和加速迟滞等问题,并通过优化布置结构,进一步提高了真空系统真空度的稳定性。

The two-stage turbocharger realizes different gas flow modes at different engine speeds through the airway valve switch,so as to meet the requirements of supercharging pressure in the whole engine speed range and improve the acceleration of vehicles under different working conditions.By changing the design of vacuum system and improving the volume of vacuum system,this paper solves the problems of torque fluctuation and acceleration hysteresis in the road test of diesl vehicles with two-stage turbocharger,and further improves the stability of vacuum system by optimizing the layout structure.