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一、汽车燃料概况在长达一个多世纪的内燃机的发展过程中,石油一直是主要燃料。据有关资料称,现已查明,世界石油储藏量为八百多亿吨。我国石油储藏量估计有近百亿吨。如果按现在的开采速度,已探明的石油储藏量只够人类开采20~30年。石油的枯竭威胁着人类。寻求新能源已迫在眉睫。1981年我国汽车保有量近200万辆,其中88%为载重汽车。载重汽车中,汽油车占90%。我国的石油既要自给,又要出口。要解决这个矛盾,一是增加石油产量,二是从煤中索 相似文献
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据有关专家介绍,我国科技创新能力在49个国家中位居28位.我国在关键技术上自给率低,对外技术依存度在50%以上,而发达国家一般在30%以下,美国和日本则在5%左右;我国研发经费投入较少,2004年我国科研经费支出1843亿元,占国民生产总值的1.35%,而创新型国家研发经费则为2%以上;我国企业自主创新能力严重不足,全国2万多家大中型企业中有研发机构的仅占25%,有研发活动的仅占3%;我国4000多家重点企业中,技术开发经费占销售收入1%以下的就占了75%;大中型企业的研发经费只占销售额的0.39%,即使高新技术企业也只占0.6%,这个比例不到发达国家的1/10. 相似文献
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商用汽车作为生产资料,其需求与国家宏观经济的增长速度密切相关。前几年,在我国GDP增速为8%~9%的情况下,我国商用车需求出现了30%~40%的高速增长的状态,到2005年我国商用汽车市场大幅度下滑却又表明了商用汽车市场的理性回归。从当前我国宏观经济总体运行情况看,国民经济呈现增长较快、效益较好、价格平稳和活力增强的态势,经济运行稳定增长和协调性均有所提高。1目前国际国内经济环境2006年,我国经济发展面临的国际环境是机遇大于挑战。机遇主要体现在,一是世界经济和世界贸易总体上仍将呈现稳定增长的势头;二是国外直接投资继续呈现… 相似文献
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2012年7月9日,国务院正式公布了《节能与新能源汽车产业发展规划(2012~2020年)》,《规划》中主要任务之一是实施节能与新能源汽车技术创新工程。 相似文献
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根据财政部、国家税务总局发出的通知,我国从2008年9月1日起实行新的汽车消费税政策,新政策的主要调整内容包括:提高大排量乘用车的消费税税率,排量在3.0L至4.0L(含4.0L)的乘用车,税率由15%上调至25%,排量在4.0L以上的乘用车,税率由20%上调至40%; 相似文献
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受公安部交管局刘钊总工委派,有幸与各位领导、专家共同探讨车辆管理中的有关问题. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3-4):161-177
SUMMARY The influence of vehicle handling on the possible avoidance of accident situations is discussed. lit is shown that accident reconstruction at present does not provide the necessary information to relate the cause of accidents to the lack of road worthiness of vehicles. It follows that the vehicle behavior in proximity of its performance limit must be determined in order to infer its accident avoidance potential. The paper presents a review of the state-of-the-art of vehicle modeling, simulation of vehicle maneuvers and full scale testing. The application of the direct method of the stability theory is suggested as a possible means of obtaining performance limit envelopes which are necessary for establishing standards of the performance of vehicles. 相似文献
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S. Brennan A. Alleyne 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2001,36(4):255-277
A temporal and spatial re-parameterization of the linear vehicle Bicycle Model is presented utilizing non-dimensional ratios of vehicle parameters called p-groups. Investigation of the p-groups using compiled data from 44 published sets of Vehicle Dynamics reveals a normal distribution about a line through p-space. The normal distribution suggests numerical-values for an 'average' vehicle and maximum perturbations about the average. A state-feedback controller is designed utilizing the p-space line and the expected p-perturbations to robustly stabilize all vehicles encompassed by the normal distribution of vehicle parameters. Experimental verification is obtained using a scaled vehicle. 相似文献
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H.K. Sachs 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1972,1(3):161-177
The influence of vehicle handling on the possible avoidance of accident situations is discussed. lit is shown that accident reconstruction at present does not provide the necessary information to relate the cause of accidents to the lack of road worthiness of vehicles. It follows that the vehicle behavior in proximity of its performance limit must be determined in order to infer its accident avoidance potential.
The paper presents a review of the state-of-the-art of vehicle modeling, simulation of vehicle maneuvers and full scale testing. The application of the direct method of the stability theory is suggested as a possible means of obtaining performance limit envelopes which are necessary for establishing standards of the performance of vehicles. 相似文献
The paper presents a review of the state-of-the-art of vehicle modeling, simulation of vehicle maneuvers and full scale testing. The application of the direct method of the stability theory is suggested as a possible means of obtaining performance limit envelopes which are necessary for establishing standards of the performance of vehicles. 相似文献
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