全可变气门米勒循环发动机的进气性能分析
时间:2018-07-28 11:39 来源:毕业论文 作者:毕业论文 点击:次
| 摘要现今由于环境的恶化和资源的日益枯竭，发展低耗能、低污染的发动机成为大势所趋。在过去，发动机的进气量是通过改变节气门的开度来改变的，无法适应所有工况的进气量要求。相比之下，米勒循环发动机能够在增大膨胀比的同时有效解决爆震问题，配合气门运行的连续变化以适应不同的工况，可以优化进气性能。因此，研究全可变气门米勒循环发动机可以提高发动机的动力性、经济性及良好的排放性。26330 本文以摩托车单缸发动机为基础，取消其节气门，利用电磁直线执行器直接控制气门的开闭时刻及开启持续角，从而建立了全可变气门米勒循环发动机的原型。首先，测量发动机的外形参数并通过实验测定其性能参数，之后利用AVL BOOST软件建立通过节气门调整进气量的传统内燃机模型与全可变气门米勒循环发动机的一文模型，模拟仿真分析发动机的转速与气门运动曲线对发动机进气量的影响。最后，利用BOOST软件，在传统机固定的转速与节气门开度下，保证新型机与传统机的进气量一致，设计出新型机的气门升程曲线，从而得出全可变气门米勒循环发动机的进气量预测模型。 关键词 全可变气门 米勒循环 进气性能 仿真模拟 毕业论文设计说明书外文摘要 Title Intake performance analysis of fully variable valve Miller cycle engine Abstract Because of the deterioration of the environment and exhaustion of resources, developing the engine that has low energy consumption and low pollution has become the trend. The traditional engine regulates inflow gas by throttle. Changeless valve train can’t take into account all operating conditions. In contrast, the Miller cycle engine is capable of increasing the expansion ratio and has effective solution to the problem of knock, with the continuous change of valve operation that adapted to different conditions. It can be used to optimize the performance of inflow. Therefore, studying on fully variable valve Miller cycle engine is important in enhancing performance of power, economic and emission. Based on motor one-cycle engine, its throttle is cancelled. The movement of the valve is controlled by electromagnetic linear actuator so as to build the model of fully variable valve Miller cycle engine. First of all, we measure all parameters of the engine and use AVL BOOST to build models of the traditional engine and new engine. Then we simulate and analysis the influence of engine speed and movement of valve to inflow gas. Finally, with the help of AVL BOOST software, under the same inflow gas, we design movement of valve of new engine that corresponding to each speed and throttle opening angle of the traditional engine. This is the inflow gas model of fully variable valve Miller cycle engine. Keywords fully variable valve; Miller cycle; intake performance; numerical simulation 目 次 1 绪论 1 1.1 米勒循环背景知识 1 1.2 米勒循环研究应用现状 1 1.3 全可变气门实现米勒循环的方式 2 1.4 全可变气门发动机的原理 3 1.5 本文研究内容和价值 5 2 全可变气门米勒循环发动机进气模拟 7 2.1 AVL BOOST软件简介 7 2.2 FVVT发动机进气过程一文模型的建立 8 2.3 传统发动机进气过程一文模型的建立 11 3 全可变气门米勒循环发动机进气量预测模型的建立 13 3.1 进气量预测模型的建立方法 13 (责任编辑：qin) |