汽油机与涡轮增压器匹配及其增压压力控制研究

发布时间：2018-01-16 23:30

本文关键词：汽油机与涡轮增压器匹配及其增压压力控制研究　出处：《湖南大学》2016年硕士论文　论文类型：学位论文

【摘要】：涡轮增压已成为内燃机节能减排的关键技术之一,但汽油机采用涡轮增压技术还存在低速增压压力不足、高速和高负荷工况易发生爆燃和增压器超速、起动和加速缓慢以及瞬态响应特性差等问题。采用废气旁通阀涡轮增压器是解决以上问题的方法之一,但机械式旁通阀只能限制最大增压压力,不能实现对多目标值增压压力的控制。采用电控旁通阀可以实现对增压压力的理想控制,且在瞬态加减速工况下,通过对废气旁通阀的瞬态控制,可使增压器与汽油机匹配良好,在保证不发生爆燃和增压器喘振及堵塞的情况下,可提高涡轮增压汽油机的瞬态性能。因此对电控旁通阀涡轮增压器与汽油机的匹配进行研究具有一定的实际意义。本论文以湖南省科技重大专项(2014FJ1013)、湖南大学汽车车身先进设计制造国家重点实验室自主课题(61075002)为依托,以某小型涡轮增压汽油机为研究对象,采用发动机性能仿真软件GT-POWER建立了带废气旁通阀电控系统的涡轮增压汽油机模型。论文主要研究内容和创新之处如下:(1)利用控制器模块标定了废气旁通阀开度,并据此对涡轮增压器与汽油机稳态匹配性能进行了分析,研究结果与实验结果较为吻合;(2)对涡轮增压汽油机瞬态加减速工况进行了仿真分析,得到了突加速工况废气旁通阀瞬态控制下的增压压力对汽油机瞬态加速响应特性的影响规律以及突减速工况初期涡轮增压器与汽油机联合运行点随废气旁通阀最大开度持续开启时间的变化规律;(3)确定了加速过程中各转速允许的最大增压压力以及减速过程初期最大旁通阀开度持续开启时间,分析了增压压力瞬态控制下汽油机与涡轮增压器瞬态匹配性能,并进行了实验验证。
[Abstract]:Turbocharging has become one of the key technologies for energy saving and emission reduction of internal combustion engines, but there is insufficient pressure at low speed in gasoline engines using turbocharging technology, deflagration and supercharger overspeed are easy to occur at high speed and high load conditions. Using exhaust gas bypass valve turbocharger is one of the methods to solve these problems, but mechanical bypass valve can only limit the maximum pressure. It can not realize the control of multi-target pressurized pressure. Using electrically controlled bypass valve can realize the ideal control of supercharging pressure, and under the condition of transient acceleration and deceleration, the transient control of exhaust gas bypass valve can be achieved. It can make the supercharger match well with the gasoline engine without deflagration, surge and blockage of the supercharger. The transient performance of turbocharged gasoline engine can be improved. Therefore, it is of certain practical significance to study the matching of electrically controlled bypass valve turbocharger with gasoline engine. 2014FJ1013). Based on the State key Laboratory of Automobile body Advanced Design and manufacture of Hunan University (61075002), a small turbocharged gasoline engine is taken as the research object. A turbocharged gasoline engine model with exhaust gas bypass valve electronic control system is established by using engine performance simulation software GT-POWER. The main contents and innovations of this paper are as follows: 1). The opening of exhaust gas bypass valve is calibrated by the controller module. The steady-state matching performance between turbocharger and gasoline engine is analyzed, and the results are in good agreement with the experimental results. 2) the transient acceleration and deceleration conditions of turbocharged gasoline engine are simulated and analyzed. The influence of pressurized pressure on transient acceleration response of gasoline engine under transient control of exhaust gas bypass valve under sudden acceleration condition and the joint operation point of turbocharger and gasoline engine with exhaust gas bypass valve at the initial stage of sudden deceleration were obtained. The change rule of the opening time; The maximum supercharging pressure of each rotational speed and the opening time of the maximum bypass valve in the initial stage of deceleration are determined. The transient matching performance of gasoline engine and turbocharger under the transient control of pressurized pressure is analyzed and verified by experiments.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK411

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