摘要
将发动机速度、负荷和万有特性离散化为矩阵形式,采用曲线拟合、曲面拟合、神经网络等方法进行数学建模,建立了汽车发动机仿真数学模型,开发了计算仿真程序.仿真实例表明,对发动机外特性进行拟合,拟合阶次越高,结果越精确,一般采取5阶拟合即可以真实反映发动机的外特性.对发动机万有特性与负荷特性进行拟合,拟合度为99.85%,试验数据模型化后的结果符合要求.建立的数学模型具有很高的模拟精度,能精确地反映出发动机的特性.
The speed, load and universal performance characteristics of engine were discreted to matrix. Mathematical models of automobile engine were established through curves and surface fitting, neural network and so on. Its computer simulation program was compiled. The simulation result shows that the precision fitting results of full load speed characteristics of engine is increasing with the exponent. Full load speed characteristics of engine could be embodied actually through five exponents fitting. Fitting accuracy is 99.85% when universal performance and load characteristics of engine were fitted. Mathematical models have higher simulation accuracy and can effectively describe characteristics of the engine.
出处
《北京交通大学学报》
EI
CAS
CSCD
北大核心
2008年第1期97-100,共4页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
交通部科技资助项目(200439800060)
关键词
发动机
仿真模型
软件设计
程序
特性
拟合
engine
simulation models
software design
program
characteristics
fitting
