ETC电子标签在线发行系统研究

针对高速公路电子不停车收费(ETC)系统大规模社会化发行的需求,结合实际系统应用经验,提出电子标签在线发行的概念,给出在线发行系统的构成形式、发行流程和数据安全保证机制,并分析发行终端设备原型和相应的数据接口,以及后台服务系统的配置和功能等。该在线发行系统可实现ETC电子标签的移动式在线发行,适用于其大规模社会化发行应用,有助于提高ETC系统的服务质量和运营效益。     

提高政府投资监管效率机制研究

政府投资监管是一项重要的政府公共管理职能。该文对提高政府投资监督效率机制作了研究。通过建立职能定位清晰、分工科学合理、协调运转高效的政府投资监管机制,发挥政府投资监管有关各部门的职能作用,提高政府投资监管效率,促进政府投资项目的科学决策和规范管理,提高公共政策的效应和政府投资的效益。     

长洪岭隧道近距下穿江池镇高效减震爆破技术试验

依托渝利铁路长洪岭隧道近距下穿地表城镇(江池镇)减震爆破施工,通过使用电子毫秒电雷管开展减震爆破试验。试验以爆破震动波的干扰降震原理为指导,结合以往工程使用非电毫秒延期导爆管雷管的减震爆破技术,并进行爆破减震动监测,优化爆破参数,形成了在30 m左右近距条件下爆破振速低于1.0 cm/s的电子毫秒电雷管全断面减震爆破开挖技术,达到了近距下穿地表城镇时降低隧道爆破振速、确保地表建筑物安全的目的。同时,拓展了在近距条件下隧道钻爆法使用范围,减少了临时支护,提高了施工工效。     

大功率高速柴油机电子管理操作系统的集成设计与研制

介绍了集成设计与研制的大功率高速柴油机电子管理操作系统的结构、功能、工作原理、系统的硬件、软件和各种电器执行部件等;将其与某型柴油机进行配机试验验证与研制,结果表明,该电子管理操作系统设计合理、调速性能指标、自动保护及数据处理传输等各项功能达到设计要求。     

An alternative approach to automotive ESC based on measured wheel forces

Traditional electronic stability control (ESC) systems act on one or more wheels on the basis of a logic aiming at the control of variables that cannot be directly measured (vehicle sideslip angle and the tyre slip). Hence, a vehicle state estimator capable of evaluating the needed variables from the data of the input sensors is necessary. In the present paper, the authors discuss a different approach to the estimation problem, assuming that the forces acting on the wheels can be directly measured. The ESC feed-forward control logic is designed through a vehicle frequency response analysis in order to obtain a faster active system activation. The variable controlled by the logic is the tyre longitudinal force. Experimental results obtained on an ESC hardware-in-the-loop test bench prove the validity of the approach, showing enhanced dynamic performances, together with the limits due to the delays in the actuation of the ESC motor pump, which needs some time to build the pressure requested for the intervention on the selected callipers. Finally, the tests demonstrate the opportunity of closing the control loop on a variable (i.e. the force) that can be directly measured.     

Comparing and validating models of driver steering behaviour in collision avoidance and vehicle stabilisation

A number of driver models were fitted to a large data set of human truck driving, from a simulated near-crash, low-friction scenario, yielding two main insights: steering to avoid a collision was best described as an open-loop manoeuvre of predetermined duration, but with situation-adapted amplitude, and subsequent vehicle stabilisation could to a large extent be accounted for by a simple yaw rate nulling control law. These two phenomena, which could be hypothesised to generalise to passenger car driving, were found to determine the ability of four driver models adopted from the literature to fit the human data. Based on the obtained results, it is argued that the concept of internal vehicle models may be less valuable when modelling driver behaviour in non-routine situations such as near-crashes, where behaviour may be better described as direct responses to salient perceptual cues. Some methodological issues in comparing and validating driver models are also discussed.     

快速控制原型在柴油机电控单元开发中的应用

根据柴油机ECU控制原理,使用Matlab/Simulink构建柴油机控制系统的仿真模型。模型基于增量式数字PID控制算法。模型中控制算法和控制逻辑子系统的建立应用了Simulink的基本模块库,信号采集和驱动子系统采用了dSPACE RTIRCPU中的模块,并使用Stateflow对系统状态进行了仿真。经过快速控制原型试验,得到了系统各项参数的试验结果,验证了模型的实时性和可靠性。     

基于AMEsim和Simulink的电动助力转向系统的联合仿真

首先利用AMEsim软件建立电动助力转向系统的动力学模型,然后在Matlab/Simulink环境中设计电动助力转向系统的ECU模型。通过AMEsim与Simulink接口,将两个模块进行联合,实现两者的联合仿真。仿真结果表明,本文所提出的电动助力转向系统的动力学模型、控制策略、联合仿真算法是正确的、有效的。     

满足国Ⅲ排放的轻型车用柴油机的开发

应用高喷射压力的PM型直列泵 电子调速器 冷EGR技术,并结合柴油机本体关键系统的优化,成功开发达到国Ⅲ排放标准要求的轻型车用YN33柴油机,并对YN33柴油机技术优势进行了分析。     

客车空气悬架电子控制系统(ECAS)

介绍客车空气悬架电子控制系统(ECAS)的特点、组成、工作原理、功能和应用方法等。