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详细阐述了汽车行驶工况的开发程序和测试方法。通过对合肥市道路交通状况的调查,选择5条具有代表性的路段进行合肥市城区的汽车行驶工况的研究,采集了大量合肥城区道路汽车行驶数据资料,运用多元统计学方法进行了道路汽车行驶工况的解析,从而建立适合合肥市道路的汽车行驶工况。 相似文献
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汽车行驶工况反映某一车型车速时间历程,在仿真计算进行各种台架试验和道路试验代表时被广泛使用。AVL Cruise能按照指定的程序模拟各种行驶工况,包括瞬变的非稳定工况,因而能预测汽车在各种工况下的动力性和燃油经济性。但目前Cruise自带的工况与我国城市的实际道路运行状况存在较大差别,因此所测量的燃油经济性与实际情况有较大出入。对合肥市本地行驶工况数据进行采集、合成,并将其导入Cruise中,形成了基于Cruise的合肥市行驶工况数据库。同时在此基础上进行燃油经济性对比仿真,为后续传动系优化设计打下基础。 相似文献
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《公路交通科技》2017,(4)
以哈尔滨市乘用车作为研究对象,利用GPS设备对哈尔滨主城区运行的乘用车工况数据进行了测试,将采集到的车速数据曲线分割为多个短行程片段,提取了片段中最具有代表性的11个工况特征参数,利用主成分分析法和聚类分析法对特征参数进行了降维和分类处理。利用相关系数提取了代表性行驶工况片段,进而构建了具有代表性的哈尔滨市主城区乘用车典型行驶工况,并与NEDC和Japan10-15乘用车道路工况进行了对比分析。分析结果表明:哈尔滨城区乘用车工况的平均车速为15 km/h,低于NEDC和Japan10-15乘用车行驶工况;加速、减速特征参数比例分别为33.57%和29.70%,高于NEDC和Japan10-15乘用车行驶工况的相关参数;现有的欧洲和日本道路工况参数与构建的哈尔滨市城区乘用车行驶工况具有较大的差异,利用基于运行数据构建的行驶工况可以更好地反映地方乘用车的运行特征。 相似文献
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S. Tamsanya S. Chungpaibulpatana B. Limmeechokchai 《International Journal of Automotive Technology》2009,10(2):251-264
The exhaust emissions and fuel consumption rates of newly registered automobiles in Thailand are currently assessed using
the standard driving cycle of the Economic Commission of Europe (ECE). Because of the highly different driving conditions,
the assessment results may not reflect realistic amounts of emissions and fuel consumption for vehicles in Bangkok traffic,
which is well known for its congestion. The objective of this study is therefore to develop a new driving cycle for vehicles
traveling on Bangkok’s main roads during peak traffic hours. This paper first presents the development of a method for selecting
representative road routes with traffic conditions that are representative of traffic in Bangkok for conducting real-world
driving speed data collection. These real-world data are obtained by driving a car equipped with a speed-time data logger
along those selected road routes. Several driving characteristics, including various profiles of microtrips, are analyzed
from the collected speed-time data, and a number of target driving parameters are then defined for use as a set of criteria
to justify the best driving cycle. A procedure for generating driving cycles from the analyzed real-driving data is also developed,
and the method to select the cycle that is most representative of Bangkok traffic is described. Comparisons found in the study
show that the target driving parameters of the newly developed driving cycle are much closer to those obtained from the real-world
measured data than those calculated from the presently used European drive cycle. This would imply that the obtained driving
cycle will produce more realistic results of the emissions and fuel consumption assessment tests for vehicles traveling in
Bangkok. The methods developed in this study for route selection and driving cycle construction can easily be adopted by other
big cities to develop their own vehicle driving cycles. Furthermore, although the developed methods are for passenger cars,
similar approaches can be applied to develop driving cycles for other types of vehicle, such as city buses and pick-up trucks. 相似文献
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利用实测的公交车运行数据,建立符合公交车运营特点的行驶工况.首先将连续行驶数据进行短行程划分并计算各短行程的特征值;之后采用主成分分析将12个特征值降为4个主成分,利用相关系数法建立了武汉市公交车的综合行驶工况;同时采用聚类分析对短行程分类,构建了公交车在拥堵道路、较畅通道路、畅通道路3类交通条件下的行驶工况;各工况同实测数据的相关系数均超过了0.98.研究结果表明,该地区公交车平均运行速度为19.46 km/h,各行驶模式下的时间比例分别为:加速26.39%、减速23.61%、匀速33.33%、怠速16.67%.此外将所建立综合工况与燃油消耗量测试工况C-WTVC比较,发现二者在平均速度和怠速时间比例方面存在较大差别.因此有必要针对公交车专门开发测试工况,从而为交通和环保部门的公交运营管理提供指导. 相似文献
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为研究不同整车驾驶循环对车辆三效催化器热老化的效果差异,选取两辆配备同款发动机的满足国六排放标准的纯汽油车和油电混合动力车,分别进行AMA、SRC、WLTC和典型RDE循环,利用数据采集系统实时采集车辆运行参数和三效催化器床体温度。基于阿伦尼乌斯公式将不同循环16万km耐久性后的热老化程度量化为热损伤,并以RDE循环为参照基准,将不同测试循环行驶16万km换算成对应的实际道路等效行驶里程。研究结果表明:相同循环下,油电混合动力车三效催化器的16万km热老化程度低于纯汽油车;AMA和SRC循环对三效催化器造成的热老化程度明显高于相同行驶里程下的WLTC循环和RDE循环。纯汽油车以AMA循环或SRC循环进行16万km耐久老化,对三效催化器所造成的老化效果相当于在实际道路上行驶了51.84和60.30万km;油电混合动力车以AMA循环和SRC循环进行16万km耐久老化,对三效催化器造成的老化效果相当于在实际道路上行驶30.44和29.21万km。 相似文献
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提出了一种基于蒙特卡洛树搜索 (Monte Carlo Tree Search,MCTS) 和启发式方法 (Heuristic Method, HM)的多参数运行工况高效构建方法。根据工况质量要求,选取表征行驶工况特征的速度、加速度和坡度参数相关指标,设计工况的目标函数;改进多个启发式方法,确保被作用后的工况序列仍可满足行驶工况动态转移特性;采用MCTS选择更适合的启发式方法,进而高效地收敛至多参数目标行驶工况。基于重型汽车实际采集的试验数据,多次分析结果表明,生成的多参数行驶工况所有特征指标相对偏差均可保持在设定阈值以内,表明生成工况与原始数据特征具备一致性;相比于纯随机启发式方法,该方法能快速构建多参数期望运行工况。 相似文献
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在新一轮合肥市城市总体规划中,位于合肥市域东北区域的包公大道定位为城市快速射线,东西向串联中心城与肥东县城,兼顾客运交通与货运走廊。依托客流预测,分析包公大道在市域路网结构中的作用。在全市骨干路网研究的基础上,对包公大道功能定位进行梳理,分析其主线路段、辅道路段及节点匝道客流,从功能分析和客流分析两方面得出研究结论。 相似文献
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This paper establishes the simulation model of a city bus on the basis of the EQ6110 bus prototype and its experimental data.
According to the actual urban driving cycle, the fuel economy and the traction performance of the EQ6110 city bus have been
simulated, and factors such as the driving cycle, the loss of power to engine accessories, the gear-shifting strategy, the
fuel shut-off strategy of the engine, etc., which influence on the bus’s fuel economy, are also quantitatively analyzed. Some
conclusions are drawn as follows: (1) driving cycles have a great influence on the fuel economy of a city bus; (2) under the
typical urban driving cycle of the public bus in China, the engine fuel shut-off strategy can save about 1 to 1.5 percent
of the fuel consumption; and (3) the optimized gear-shifting rules can save 6.7 percent of the fuel consumption. Experimental
results verify that the fuel economy for the EQ6110 public bus is improved by 7.2 pecent over the actual Wuhan urban driving
cycle of the current public bus in China. 相似文献
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比较了客车燃用两种不同比例二甲醚—柴油混合燃料及普通柴油的能耗与排放。结合燃料生产阶段和运输过程的数据,分析和比较了不同燃料在客车上应用的全生命周期指标。结果表明,与柴油车相比,在全生命周期内二甲醚—柴油混合燃料车的VOC,CO,NOx和PM的排放分别降低,且随着混合燃料中二甲醚比例的增加,有害排放物下降得更多,但混合燃料车的总能耗、CO2和SO2排放分别增加。 相似文献