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基于神经网络的汽油HCCI发动机空燃比控制策略(Air/Fuel Ratio Control of Gasoline HCCI Engine Based on Neural Network)
汽油发动机 均质充量压缩燃烧 空燃比
2009/8/11
均质压缩燃烧(HCCI)在控制上存在难点,其中关键是基于循环的空燃比实时控制。HCCI汽油机没有能直接表征发动机每循环进气量的参数,因此,采用动态递归神经网络(Elman网络)预测HCCI发动机每循环的进气量。通过氧传感器闭环和瞬态工况中的油膜补偿,实现对HCCI发动机的稳态及瞬态工况下空燃比的精确控制。试验表明:汽油HCCI发动机神经网络预测模型及空燃比控制策略能满足HCCI发动机实时控制的需求...
Profitability and risk ratio of financial portfolio
financial investment portfolio profitability risk ratio
2014/3/28
Financial portfolio represents a certain type of investments diversification and hence it issues a possibility how to reduce risk ratio and to ensure a sufficient profitability of financial investment...