ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

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.