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基于馬爾科夫的城市道路行駛工況構(gòu)建方法
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Construction Methodology of City Road Based on Markov Process
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    摘要:

    將汽車(chē)行駛工況看作一個(gè)隨時(shí)間變化的馬爾科夫過(guò)程,,利用最大似然估計(jì)法,,將行駛工況分成6個(gè)不同狀態(tài),而每個(gè)行駛片段作為反映加速度變化的模型事件,,更好地保持了車(chē)輛行駛過(guò)程中微小時(shí)間段內(nèi)的速度變化特性,。在此基礎(chǔ)上提出了狀態(tài)轉(zhuǎn)移概率與相似性檢驗(yàn)相結(jié)合的候選工況選擇方法,,建立了具有13個(gè)特征參數(shù)的評(píng)價(jià)準(zhǔn)則,。以合肥市典型道路為例進(jìn)行了實(shí)際應(yīng)用分析,并通過(guò)獨(dú)立性檢驗(yàn),,驗(yàn)證了馬爾科夫方法應(yīng)用于行駛工況的合理性,。結(jié)果表明,在與試驗(yàn)數(shù)據(jù)進(jìn)行模型事件加速度分布的K-S檢驗(yàn)上,,馬爾科夫方法相似性水平為0.998,、0.989和0.994,而傳統(tǒng)方法的相似性水平則為0.788,、0.036和0.992,。因此其更符合實(shí)際道路的行駛工況。

    Abstract:

    The vehicle driving cycle was taken as a stochastic Markov process with time, which was divided into 6 different states by maximum likelihood estimation (MLE). And every driving segment, as the modal event reflecting acceleration variations, finely preserved the speed variation characteristic in tiny time segments of the vehicle driving process. Therefore, the selection approach of candidate cycles was put forward by combination of the states transition probabilities with similarity tests, and the new evaluation criteria with 13 characteristic parameters was established. The actual application analysis was carried out with an example of typical roads driving cycles in Hefei and the independent test was performed to validate the rationality of the Markov method for the driving cycle. The results showed that the similarity levels of the Markov method, on the K-S test of modal events acceleration distribution with experimental data, were 0.998, 0.989, 0.994, contrasting the traditional method, 0.788, 0.036, 0.992. Resultingly, the Markov method more accords with driving cycles of real roads.

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姜平,石琴,陳無(wú)畏.基于馬爾科夫的城市道路行駛工況構(gòu)建方法[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(11):26-30. Construction Methodology of City Road Based on Markov Process[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(11):26-30.

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