Otto循环改Atkinson循环汽油机的设计开发及实验研究

发布时间：2018-02-02 09:01

本文关键词： Atkinson循环仿真设计台架标定燃油经济性　出处：《湖南大学》2016年硕士论文　论文类型：学位论文

【摘要】：由于传统Otto循环汽油机采用节气门控制负荷,油耗高,热效率低,不能满足混合动力汽车的需求,目前市场上混合动力汽车普遍采用的是Atkinson循环汽油机。Atkinson循环汽油机由于具有高膨胀比、通过进气门晚关控制负荷的特点,因此在热效率、燃油消耗上较Otto循环汽油机有独特的优势,因此对Otto循环汽油机改进设计为Atkinson循环进行研究是很有必要的。本文采用数值模拟计算和实验验证相结合的方法,将某Otto循环汽油机改进设计为Atkinson循环汽油机,并对Atkinson循环汽油机的性能进行实验分析以及对仿真方案进行验证,论文主要工作和创新点如下:(1)在一维仿真软件GT-POWER中建立原Otto循环汽油机仿真模型,通过软件模拟计算并与实验结果进行对比,误差在5%以内,两者有较好的吻合,验证了仿真模型的准确性。(2)通过模拟计算从指示热效率、泵气损失和燃油消耗率方面对不同的压缩比、进气凸轮工作包角、进气门关闭时刻进行对比分析,选择最佳压缩比和进气凸轮工作包角,依据最佳改进方案,对关键零部件进行重新设计,从而完成Atkinson循环汽油机的设计开发。(3)根据实验台架标定结果,从外特性、典型工况和万有特性方面对Atkinson循环发动机性能和原机进行对比分析,实验数据表明整机最低燃油消耗率降低至230g/(k W·h),再将实验结果和仿真计算结果进行对比,验证仿真设计方案的合理性。
[Abstract]:Because the traditional Otto cycle gasoline engine uses throttle to control the load, the fuel consumption is high and the heat efficiency is low, so it can not meet the demand of the hybrid electric vehicle. At present, the Atkinson cycle gasoline engine. Atkinson cycle gasoline engine is widely used in the market. Because of its high expansion ratio and the characteristics of controlling the load through the late closing of the intake valve, it is of great importance in the thermal efficiency. The fuel consumption has a unique advantage over the Otto cycle gasoline engine, so it is necessary to study the improved design of the Otto cycle gasoline engine to Atkinson cycle. The method of numerical simulation and experimental verification is used in this paper. An improved Otto cycle gasoline engine is designed as a Atkinson cycle gasoline engine. The performance of the Atkinson cycle gasoline engine is analyzed experimentally and the simulation scheme is verified. The main work and innovation of this paper are as follows: (1) the original simulation model of Otto circulating gasoline engine is established in one-dimensional simulation software GT-POWER. The simulation results are compared with the experimental results, and the error is less than 5%, which is in good agreement with each other. The accuracy of the simulation model is verified. (2) the different compression ratio, the working angle of the intake cam and the closing time of the inlet valve are compared and analyzed from the aspects of indicated heat efficiency, pump gas loss and fuel consumption rate through the simulation calculation. Selecting the best compression ratio and the working angle of the intake cam, according to the best improvement scheme, redesigning the key parts, thus completing the design and development of the Atkinson cycle gasoline engine. The performance of the Atkinson cycle engine and the original engine are compared and analyzed in typical operating conditions and universal characteristics. The experimental data show that the minimum fuel consumption rate of the whole engine is reduced to 230 g / kg / kg W 路hU, and the experimental results are compared with the simulation results. The rationality of the simulation design is verified.
【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】：TK412

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