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941.
大众汽车集团是中国汽车工业最早、最成功的国际合作伙伴之一,除江淮大众外,其主要的合资公司为上汽大众和一汽大众,文章主要是统计一汽大众、上汽大众所有大众品牌在售乘用车车型信息、销量、动力性、经济性、整备质量等相关参数,从车机箱搭载维度、整车性能表现维度、发动机搭载形式和性能维度以及车辆整备质量维度等方面进行整车匹配性能统计分析。 相似文献
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检查车辆技术状况是车辆维护中必不可少的环节。文章介绍了车辆外观技术状况的检测方法,指出了汽车性能检测的主要内容及其意义,最后提出了汽车技术状态良好的标准。汽车在运行中所产生的故障虽然很复杂,但只要在反复实践中进行科学分析,不断总结经验,就能比较熟练地掌握判断排除故障的实际技能。 相似文献
943.
Traditionally, researchers studying transportation choice have used data either acquired from household surveys or broad,
region-wide aggregates. At the disaggregate level, researchers usually do not have access to important variables or observations.
This study investigates the potential usefulness of a proxy approach to modeling discrete choice vehicle ownership: substituting
narrow area-based aggregate proxies for missing micro-level explanatory variables by accessing large, publicly maintained
datasets. We use data from the 2000 Bay Area Travel Survey (BATS) and the contemporaneous U.S. Census file to compare three
models of vehicle ownership, drawing area-wide proxies from increasing levels of aggregation. The models with proxies are
compared with a parallel model that uses only survey data. The results indicate that the proxy models are preferred in terms
of model selection criteria, and predict vehicle ownership as well or better than the survey model. Parameter values produced
by the proxy method effectively approximate those returned by household survey models in terms of coefficient sign and significance,
particularly when the aggregate variables are representative of their household-level counterparts. The proxy model with the
narrowest level of aggregation achieved the best fit, coefficient precision, and percentage of correct prediction.
相似文献
Jeffrey WilliamsEmail: |
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Residential location,vehicle ownership and travel in Asia: a comparative analysis of Kei-Han-Shin and Kuala Lumpur metropolitan areas 总被引:1,自引:1,他引:0
The study examines the relationships between residential location, vehicle ownership and mobility in two metropolitan areas
of Asia, Kei-Han-Shin area of Japan and Kuala Lumpur area of Malaysia. It shows that, behind apparent similarities of household
auto ownership and travel time expenditure per household member, there are many causal relationships that are distinct between
the areas. The similarities and differences between the two areas point to the conjecture that the evolution of a metropolitan
area may be unique and path dependent, being heavily influenced by the history and culture of the locale, spatial and geographical
constraints, and historical progression in infrastructure development.
Metin Senbil is an Associate Professor in City and Regional Planning Department at Gazi University in Ankara, Turkey. He obtained the degree of Doctor of Engineering from Kyoto University, Japan. His research interests cover different aspects of urban travel demand and its interactions with telecommunications, land use, and policies directed at controlling as well as managing travel demand. Ryuichi Kitamura is Professor of Civil Engineering Systems at Kyoto University, Japan. His past research effort spans in the area of travel behavior analysis and demand forecasting, in particular in activity-based analysis, and panel surveys and dynamic analysis of travel behavior. He is associate editor of Transportation. Dr Jamilah Mohamad is Professor and Head of the Department of Geography, University of Malaya, Kuala Lumpur. Her main fields of research interest are travel behavior, the relationship between transport and spatial development and urban growth management. 相似文献
Jamilah MohamadEmail: |
Metin Senbil is an Associate Professor in City and Regional Planning Department at Gazi University in Ankara, Turkey. He obtained the degree of Doctor of Engineering from Kyoto University, Japan. His research interests cover different aspects of urban travel demand and its interactions with telecommunications, land use, and policies directed at controlling as well as managing travel demand. Ryuichi Kitamura is Professor of Civil Engineering Systems at Kyoto University, Japan. His past research effort spans in the area of travel behavior analysis and demand forecasting, in particular in activity-based analysis, and panel surveys and dynamic analysis of travel behavior. He is associate editor of Transportation. Dr Jamilah Mohamad is Professor and Head of the Department of Geography, University of Malaya, Kuala Lumpur. Her main fields of research interest are travel behavior, the relationship between transport and spatial development and urban growth management. 相似文献
945.
Ching-Shin Norman Shiau Jeremy J. Michalek Chris T. Hendrickson 《Transportation Research Part A: Policy and Practice》2009,43(9-10):814-828
The US Corporate Average Fuel Economy (CAFE) regulations are intended to influence automaker vehicle design and pricing choices. CAFE policy has been in effect for the past three decades, and new legislation has raised standards significantly. We present a structural analysis of automaker responses to generic CAFE policies. We depart from prior CAFE analyses by focusing on vehicle design responses in long-run oligopolistic equilibrium, and we view vehicles as differentiated products, taking demand as a general function of price and product attributes. We find that under general cost, demand, and performance functions, single-product profit maximizing firm responses to CAFE standards follow a distinct pattern: firms ignore CAFE when the standard is low, treat CAFE as a vehicle design constraint for moderate standards, and violate CAFE when the standard is high. Further, the point and extent of first violation depends upon the penalty for violation, and the corresponding vehicle design is independent of further standard increases. Thus, increasing CAFE standards will eventually have no further impact on vehicle design if the penalty for violation is also not increased. We implement a case study by incorporating vehicle physics simulation, vehicle manufacturing and technology cost models, and a mixed logit demand model to examine equilibrium powertrain design and price decisions for a fixed vehicle body. Results indicate that equilibrium vehicle design is not bound by current CAFE standards, and vehicle design decisions are directly determined by market competition and consumer preferences. We find that with increased fuel economy standards, a higher violation penalty than the current stagnant penalty is needed to cause firms to increase their design fuel economy at equilibrium. However, the maximum attainable improvement can be modest even if the penalty is doubled. We also find that firms’ design responses are more sensitive to variation in fuel prices than to CAFE standards, within the examined ranges. 相似文献
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Janusz Gajda Piotr Piwowar Ryszard Sroka Marek Stencel Tadeusz Zeglen 《Transportation Research Part C: Emerging Technologies》2012,21(1):57-66
This article presents the findings of model and field research into narrow inductive loop used as vehicle wheels detector in normal traffic conditions. The efficiency of the solution was compared with that of strip, polymeric piezoelectric detectors. The findings confirmed that narrow inductive loops can be successfully applied as wheel detectors. 相似文献
950.
Leon RaykinMatthew J. Roorda Heather L. MacLean 《Transportation Research Part D: Transport and Environment》2012,17(3):243-250
We evaluate the implications of a range of driving patterns on the tank-to-wheel energy use of plug-in hybrid electric vehicles. The driving patterns, which reflect short distance, low speed, and congested city driving to long distance, high speed, and uncongested highway driving, are estimated using an approach that involves linked traffic assignment and vehicle motion models. We find substantial variation in tank-to-wheel energy use of plug-in hybrid electric vehicles across driving patterns. Tank-to-wheel petroleum energy use on a per kilometer basis is lowest for the city and highest for the highway driving, with the opposite holding for a conventional internal combustion engine vehicle. 相似文献