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Otto循环改Atkinson循环汽油机的设计开发及实验研究
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 2309/(),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。
关键词:Atkinson循环;仿真设计;台架标定;燃油经济性
II
万方数据
硕士学位论文
Abstract
Due to the traditional Otto cycle engine using the throttle to control load,fuel consumption was high and thermal efficiency was low,that cannot meet the demand of hybrid electric present the Atkinson cycle engines are widely accepted in hybrid vehicles,with high inflation rate,inlet valves later closing to control load characteristics,SO the thermal efficiency and fuel consumption on the Atkinson cycle engine has unique advantages,therefore,studying On the Otto cycle engine improved
design for the Atkinson cycle was necessary.
This paper studied on an Otto cycle engine improvement design for the Atkinson cycle engine bining the methods of numerical simulation and experimental verification,and analyzed on the performance of the Atkinson cycle engine,its main work and innovative points are as follows:
(1)In the one dimensional simulation software GT-POWER,the Otto cycle engine simulation model was established,through software simulated,the simulation results pared with the test results,the error was within 5%,SO the simulation model was accurate.
(2)The pression ratio,inlet CAM work Angle and inlet valve closing time were analyzed from the indicated thermal efficiency,pumping gas loss and fuel consumption rate by simulation calculation,the pression ratio
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 2309/(),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。
关键词:Atkinson循环;仿真设计;台架标定;燃油经济性
II
万方数据
硕士学位论文
Abstract
Due to the traditional Otto cycle engine using the throttle to control load,fuel consumption was high and thermal efficiency was low,that cannot meet the demand of hybrid electric present the Atkinson cycle engines are widely accepted in hybrid vehicles,with high inflation rate,inlet valves later closing to control load characteristics,SO the thermal efficiency and fuel consumption on the Atkinson cycle engine has unique advantages,therefore,studying On the Otto cycle engine improved
design for the Atkinson cycle was necessary.
This paper studied on an Otto cycle engine improvement design for the Atkinson cycle engine bining the methods of numerical simulation and experimental verification,and analyzed on the performance of the Atkinson cycle engine,its main work and innovative points are as follows:
(1)In the one dimensional simulation software GT-POWER,the Otto cycle engine simulation model was established,through software simulated,the simulation results pared with the test results,the error was within 5%,SO the simulation model was accurate.
(2)The pression ratio,inlet CAM work Angle and inlet valve closing time were analyzed from the indicated thermal efficiency,pumping gas loss and fuel consumption rate by simulation calculation,the pression ratio
otto循环改atkinson循环汽油机的设计开发及实验研究-动力工程及工程热物理专业毕业论文 来自淘豆网www.taodocs.com转载请标明出处.
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