可调两级增压系统的动态特性及控制研究

发布时间：2018-08-20 12:41

【摘要】：可调两级增压系统作为最具研究潜力的一种增压技术,不仅能够实现高压比的要求,为诸多先进技术提供更多的进气量,更能提高增压系统的动态响应性能,解决进气滞后的问题。为了实现两级增压系统在发动机稳态时能够达到经济性最优的增压压力,以及动态过程中具有较高的响应性能,本文以一款6缸增压柴油机为研究对象,进行了可调两级增压系统试验台架的改造以及仿真模型的建立,重点研究了可调两级增压系统中高压级涡轮旁通阀的控制系统。通过仿真模拟和试验确定了稳态工况下增压系统的闭环控制算法以及控制策略;通过检测转速、喷油量以及油门位置的变化,旁通阀控制系统能够对发动机动态过程进行判断,并根据过量空气系数及其变化率执行相应的调节动作,进一步提高了动态过程中的响应性。最终集成了一套兼顾稳态时油耗较低和动态时响应性较高的控制系统。
[Abstract]:As one of the most promising supercharging technologies, the adjustable two-stage supercharging system can not only meet the requirements of high pressure ratio, provide more air intake for many advanced technologies, but also improve the dynamic response performance of the turbocharging system. Solve the problem of air intake lag. In order to realize that the two-stage turbocharging system can achieve the optimal pressurization pressure in the steady state of the engine and the high response performance in the dynamic process, a 6-cylinder turbocharged diesel engine is taken as the research object in this paper. The test bench of adjustable two-stage turbocharging system and the establishment of simulation model are carried out, and the control system of high-pressure turbine by-pass valve in adjustable two-stage turbocharging system is studied emphatically. The closed-loop control algorithm and control strategy of the booster system under steady condition are determined by simulation and experiment, and the dynamic process of the engine can be judged by the by-pass valve control system by detecting the change of speed, fuel injection and throttle position. According to the excess air coefficient and its rate of change, the response of the dynamic process is further improved. Finally, a control system with low fuel consumption and high dynamic response is integrated.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK423

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