以插电式混合动力汽车(plug-in hybrid electric vehicle,PHEV)作为研究对象,以寻求较好的燃油经济性为目标,根据循环道路工况反馈的信息对未来临近时刻的车速进行预测。基于马尔科夫链预测模型,进行WLTC循环工况的马尔科夫性分析,采用...以插电式混合动力汽车(plug-in hybrid electric vehicle,PHEV)作为研究对象,以寻求较好的燃油经济性为目标,根据循环道路工况反馈的信息对未来临近时刻的车速进行预测。基于马尔科夫链预测模型,进行WLTC循环工况的马尔科夫性分析,采用最大似然估计法计算当前时刻车速到下一时刻车速的状态转移概率,建立车速信息的状态转移矩阵。借助MATLAB中的Markov工具箱对车速进行预测,得到了能够较好跟随实际工况车速的行驶预测车速曲线,发现预测速度与实际工况车速的误差在合理范围之内。进一步提出车速预测型能量管理策略,通过MATLAB/Simulink仿真验证有效性,与基于规则的能量管理策略相比,结果表明该能量管理策略具有良好的动态控制性能,燃油经济性提高10.15%,能够节省燃油成本。展开更多
Setting reliable speed limits on roads has always been a challenging process of designers and road agencies. In this paper the results of a methodology for setting speed limits on rural roads of all categories in Gree...Setting reliable speed limits on roads has always been a challenging process of designers and road agencies. In this paper the results of a methodology for setting speed limits on rural roads of all categories in Greece is presented based on international research and an extensive drivers attitudes＇ survey. The 85th percentile speed has proven in this case to be the decisive criterion for establishing reliable speed limits or advisory speeds in most cases. The resulted 10 km/la increase in legal speed limits on freeways and express rural highways did not validate any fears that accident rates or frequencies would increase. On the contrary an 8% decrease of crashes was observed in a period of about three years after the implementation of the increased speed limits level on the rural highway network of the country.展开更多
文摘以插电式混合动力汽车(plug-in hybrid electric vehicle,PHEV)作为研究对象,以寻求较好的燃油经济性为目标,根据循环道路工况反馈的信息对未来临近时刻的车速进行预测。基于马尔科夫链预测模型,进行WLTC循环工况的马尔科夫性分析,采用最大似然估计法计算当前时刻车速到下一时刻车速的状态转移概率,建立车速信息的状态转移矩阵。借助MATLAB中的Markov工具箱对车速进行预测,得到了能够较好跟随实际工况车速的行驶预测车速曲线,发现预测速度与实际工况车速的误差在合理范围之内。进一步提出车速预测型能量管理策略,通过MATLAB/Simulink仿真验证有效性,与基于规则的能量管理策略相比,结果表明该能量管理策略具有良好的动态控制性能,燃油经济性提高10.15%,能够节省燃油成本。
文摘Setting reliable speed limits on roads has always been a challenging process of designers and road agencies. In this paper the results of a methodology for setting speed limits on rural roads of all categories in Greece is presented based on international research and an extensive drivers attitudes＇ survey. The 85th percentile speed has proven in this case to be the decisive criterion for establishing reliable speed limits or advisory speeds in most cases. The resulted 10 km/la increase in legal speed limits on freeways and express rural highways did not validate any fears that accident rates or frequencies would increase. On the contrary an 8% decrease of crashes was observed in a period of about three years after the implementation of the increased speed limits level on the rural highway network of the country.
