郑太雄,周可君,李永福,李宣政.汽油机进气道油膜动力学模型参数辨识[J].农业机械学报,2015,46(4):296-301.
Zheng Taixiong,Zhou Kejun,Li Yongfu,Li Xuanzheng.Parameter Identification of Intake Port Fuel Film Dynamic Model for Gasoline Engine[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(4):296-301.
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汽油机进气道油膜动力学模型参数辨识   [下载全文]
Parameter Identification of Intake Port Fuel Film Dynamic Model for Gasoline Engine   [Download Pdf][in English]
投稿时间:2014-05-30  
DOI:10.6041/j.issn.1000-1298.2015.04.044
中文关键词:  发动机  油膜模型  参数辨识  递推最小二乘算法  马尔可夫估计
基金项目:国家自然科学基金资助项目(61304197)、 重庆市教委科学技术研究资助项目(KJ130506)和重庆邮电大学青年基金资助项目(A2012—78)
作者单位
郑太雄 重庆邮电大学 
周可君 重庆邮电大学 
李永福 重庆邮电大学 
李宣政 重庆邮电大学 
中文摘要:为了更加精确地辨识汽油机进气道油膜模型参数,从而更加精确地控制空燃比,在油膜动力学模型的基础上,考虑模型误差和随机误差,建立了油膜辨识方程。根据递推最小二乘算法得到油膜参数估计的加权矩阵表达式,利用马尔可夫估计得到该加权矩阵,进而得到油膜参数的最优估计。应用GT-power建立了发动机模型,在转速1000~3500r/min、节气门开度5%~75%变化时,分别利用提出的算法和最小二乘法对油膜参数进行了辨识,并与标定值进行了比较。结果表明,燃油沉积系数X在同一转速时,随着节气门开度的增大而减小,在同一节气门开度时,随着转速的增加而减小;油膜质量蒸发时间常数τ在同一转速时,随着节气门开度的增大而增加;在同一节气门开度时,随着转速的增加而减小。通过误差分析,表明所提出的方法比最小二乘算法的辨识结果精度更高。
Zheng Taixiong  Zhou Kejun  Li Yongfu  Li Xuanzheng
Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications,Chongqing University of Posts and Telecommunications and Chongqing University of Posts and Telecommunications
Key Words:Engine  Fuel film model  Parameter identification  Recursive least squares algorithm  Markov estimation
Abstract:Accurate air-fuel ratio control is the key element for fuel economy low emissions and good driveability of spark ingnition engine. In order to more accurately identify the fuel film model parameter and achieve precise control of air-fuel ratio, the film identification equation based on fuel film dynamic model was built under the consideration of model error and random error. According to recursive least squares, the parameter estimation with weighted matrix expression was got, then the weighted matrix was solved using Markov estimation and the estimated value of optimal film parameter was got consequently. An engine model was set up using GT-power, and air fuel ratio, mass injection flow engine speed and air mass flow were obtained by using sampling experiment. Parameter identification applying the proposed algorithm and the least squares were conducted at 1000~3500r/min with throttle opened from 5%~75%, respectively. Meanwhile, the identification results were compared with the calibration value. The results showed that the deposition coefficient X of fuel reduced and evaporation time constant τ of film quality increased with increase of throttle opening degree when speed was the same, and X, τ decreased as speed increasing when throttle opening degree was the same. Compared with the least squares algorithm, more accurate identification result can be got by using the proposed algorithm.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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