提高驾培质量信誉有效途径的探讨

以广东省驾培行业现状为例进行分析,调查驾培质量信誉发展状况,指出提高驾培质量信誉的关键是兼顾地区发展不平衡,引导行业进行经营模式变革,并通过长效机制强化市场监督,建立诚信体系,并提出了如何建立符合广东地方特色的驾培质量信誉考评体系,以评促改,以评促建的构想。     

2007年车用发动机活塞市场分析及2008年预测

2007年我国车用发动机活塞市场实现了同步高速稳定的增长.由于国内活塞行业竞争的进一步加剧,加上原材料涨价和政府政策调整及国外同行业公司加入等不利因素的影响,我国活塞企业的经营环境不容乐观,整体盈利能力呈下降趋势.2008年车用发动机及活塞企业面临的情况是机遇与挑战并存,在发展上整体呈现稳中上升的态势,但增长幅度将明显放缓,增幅为18%左右,我国活塞企业的经营环境在短期内无明显改善.     

A discrete–continuous model of households’ vehicle choice and usage, with an application to the effects of residential density

This paper develops a new method to solve multivariate discrete–continuous problems and applies the model to measure the influence of residential density on households’ vehicle fuel efficiency and usage choices. Traditional discrete–continuous modelling of vehicle holding choice and vehicle usage becomes unwieldy with large numbers of vehicles and vehicle categories. I propose a more flexible method of modelling vehicle holdings in terms of number of vehicles in each category, using a Bayesian multivariate ordinal response system. I also combine the multivariate ordered equations with Tobit equations to jointly estimate vehicle type/usage demand in a reduced form, offering a simpler alternative to the traditional discrete/continuous analysis. Using the 2001 National Household Travel Survey data, I find that increasing residential density reduces households’ truck holdings and utilization in a statistically significant but economically insignificant way. The results are broadly consistent with those from a model derived from random utility maximization. The method developed above can be applied to other discrete–continuous problems.     

A case for measuring individuals’ access to private-vehicle travel as a matter of degrees: lessons from focus groups with Mexican immigrants in California

In auto-oriented communities, access to an automobile is essential for good mobility, but not everyone owns a car or is able to drive. Little is known about how individuals in these circumstances might still use vehicles for transportation. To provide insight on the nature of vehicle use by those with potentially limited vehicle access, we present qualitative findings from focus groups with recent Mexican immigrants living in California, half of whom owned no cars. Our results demonstrate varying degrees of participants’ access to vehicle travel not always corresponding to auto ownership, with extensive sharing of cars, borrowing of cars, and getting rides. We describe the different dimensions of vehicle access that participants experienced and identify specific factors that seemed to influence their access levels. We discuss the implications of our findings for transportation policy and future research.

高速公路桥头跳车分析与治理措施

阐述了处理好台后地基、合理使用填筑材料、设置桥头搭板、妥善处理好接缝、严格控制施工等治理措施.     

基于Petri网的城市轨道交通车辆子系统运营安全性模型

本文提出了一种可用于分析城市轨道交通系统安全性的Petri网建模方法,将其用于轨道交通车辆运营安全性建模。该模型利用面向对象方法,将轨道交通车辆子系统分为三个对象处理模块,各个对象类之间通过消息库所连接,从而形成较完整的车辆子系统运营安全模型。     

基于1 1/2维倒谱的汽车齿轮变速器信号特征提取

从三阶累积量出发,提出112维倒谱的概念,从理论上推导了其能抑制噪声、提高信噪比。并将其与倒谱对比,应用于实际的汽车齿轮变速器故障特征提取,分析表明,相对于倒谱而言112维倒谱能有效地从复杂的信号成分中提取出特征信号来,并且计算量小,精度高。     

基于模糊逻辑的车辆侧偏角估计方法

提出了一种基于模糊逻辑的汽车侧偏角估计方法。它利用模糊逻辑和汽车运动学模型,将汽车转向盘转角、车轮转速、汽车加速度和横摆角速度信息相融合,进行车辆侧偏角估计。试验结果显示,该方法的鲁棒性和精确性较好,而且响应频率较高,可以满足ESP的控制需要。     

红旗CA7180/CA7182排放的标定匹配

结合CA7180／7182红旗轿车的标定工作,综述了汽油机采用一级三效催化剂加闭环电子控制的措施,使排放达到欧Ⅱ法规要求的发动机电控系统标定匹配方法,并给出了红旗轿车的标定匹配结果。