王利民1，裴海俊1，张文1，冷泠2，石磊2*
1.广西玉柴机器股份有限公司,广西玉林537005；
2.上海交通大学动力机械与工程教育部重点实验室，上海200240
摘要：利用GTPower仿真软件建立两级增压系统WP7柴油机仿真模型，研究不同流量特性调节阀在可调两级增压系统中的工作性能，获得两级增压系统调节特性；比较不同调节阀流量特性对增压压力调节的影响，分析不同流量特性的阀门开度对增压压力有效调节范围以及全开度范围单位调节量变化规律。结果表明：不同流量特性调节阀对可调两级增压系统调节特性不同，直线型、快开型和抛物线型流量特性调节阀对增压压力的有效调节开度相对较小，可以实现对增压压力的快速调节；等百分比流量特性在全开度范围内单位调节量基本相同，在小开度下能够降低流量敏感性、提高控制精度，大开度下提升流量敏感性、提高响应快速性，可以较好地满足两级可调增压系统大跨度、高精度增压压力调节需求。
关键词：柴油机；可调两级增压系统；调节阀；流量特性；仿真
Abstract：The simulation model of WP7 diesel engine with twostage turbocharging system is established using GTPower software,the performance of regulating valve with different flow characteristics in adjustable twostage turbocharging system is studied.The adjustment requirements are obtained, and the influence of the flow characteristics of different regulating valves on the regulation of boost pressure is compared. The effective range of valve opening of different flow characteristics and the equalization of full open range gain are analyzed. The results show that the regulating characteristics of regulating valves with different flow characteristic are different for the adjustable twostage turbocharging system, and the effective opening of linear, fast opening and parabolic flow characteristic regulating valves for the turbocharging pressure regulation is relatively small, which can realize the rapid regulation of the turbocharging pressure.The gain of equal percentage flow characteristics in the whole range of unit regulation is basically the same,in small opening degree, the flow sensitivity can be reduced and the control accuracy can be improved,in wide opening degree, the flow sensitivity can be increased and the responsiveness can be improved,which is complementary to the control of regulated twostage turbocharging system,which can well meet the requirements of large span and high precision turbocharging pressure regulation of twostage turbocharging system.
Keywords:disiel engine;regulated twostage turbocharging system;regulating valve;flow characteristic; simulation
|
