Pressure control of an electro-hydraulic actuated clutch via novel hysteresis model

This paper mainly focuses on the development of pressure tracking control logic of electro-hydraulic actuators for vehicle application. This is done to improve and ensure the performance of a precise lower-level controller for evolving modern shift control logic. The required performance is obtained by hysteresis model-based feed-forward control and additional feedback control. The hysteresis and the time delay, which adversely affect pressure control, are well known nonlinear behaviors in electro-hydraulic actuators. In order to cope with the hysteresis, a novel hysteresis model is proposed based on a physical phenomenon. A mathematical model based on a characteristic curve obtained in preliminary experiments is presented using only one tuning parameter, and this model can be inverted easily to construct a feed-forward controller. In addition, a feedback controller is designed considering the stability margin of a time delay system. The feedback control inputs ensure compensation of the feed-forward errors caused by model error and uncertainty. The proposed controller is designed to lower computational cost considering applicability for production vehicles. As a result, the developed pressure controller is applied to a transmission control unit of a production vehicle and verified experimentally for various driving scenarios.     

几种新型联轴器

根据国内外资料，总结了几种新型联轴器，介绍了其工作原理和性能特点。     

超越离合器内星轮对数螺旋楔合面的设计

通过对采用平面楔合面内星轮的超越离合器的受力及磨损对其使用可靠性影响的分析，从而提出了用对数螺旋楔合而代替平面楔合面的设计方案，并对两种方案进行了比较。     

Alcoholism at the time of injury among trauma center patients: Vehicular crash victims compared with other patients

A structured in-depth interview employing standardized criteria was used to determine the prevalence of lifetime and current alcohol dependence (alcoholism) in unselected consecutive patients admitted to a regional Level I trauma center. Of 629 patients, 157 (25.0%) were current alcoholics at the time of injury. An additional 87 (13.8%) were diagnosed as lifetime non-current alcoholics. There was no significant difference in the rates of current alcohol dependence among patients injured in vehicular crashes (23.5%), other unintentional trauma victims (29.3%), and those injured as a result of violence (24.6%). Of BAC + (blood alcohol concentration positive) patients, 54.5% were current alcoholics. However, 14.4% of alcohol-negative patients were also diagnosed as alcohol dependent.     

车载自组织网络分布式入侵检测算法研究

随着汽车产业的发展,汽车给我们带来便利的同时也给我们带来一系列的问题,例如交通拥堵、交通安全等。为了解决这些问题车载自组织网络应运而生。但是车载自组织网络中信息安全问题一直存在,采用分布式入侵检测模型和基于此模型下的改进随机森林分类算法可以很好地解决这个问题。     

用于行星轮式耦合装置的锁止离合器动力学分析

确保纯电动行驶中快速、平稳地启动发动机,是P2构型混合动力系统的技术难点之一。行星轮耦合式混合动力系统应用锁止离合器的分离或接合,以实现行星轮装置的差速运动或同速运动,可实现混合动力不同模式间的切换。通过行星轮锁止离合器的动力学分析,以启动冲击最小化为目标,推导了纯电动行驶中启动发动机时锁止离合器的力矩计算公式。     

汽车离合器从动盘自由行程检测机的改进

介绍了对法国瓦雷奥(VELEO)公司生产的汽车离合器从动盘自由行程检测机的半自动化改进方案,同时,介绍了改进后的自由行程检测机的结构、工作过程以及原理.     

摩托车超越离合器本体的精密锻造工艺研究

通过中间预制坯形状和尺寸的合理设计、采用合适的冷挤压模具结构,用温/冷复合成形工艺进行了摩托车超越离合器本体内孔型腔的精密成形.采用该工艺生产的超越离合器本体精锻件,其内孔型腔不仅表面光洁度高、尺寸精度高,而且内孔型腔不再后续机械加工就可以达到超越离合器本体的设计要求,因此具有显著的节能、节材效果,经济效益十分显著.从1996年至今500万余件的生产实践表明,采用冷/温复合成形工艺是生产摩托车超越离合器本体的一种高效加工工艺.     

离合器端盖成形工艺及模具设计

分析了离合器端盖的成形工艺难点和关键技术，设计了合理的工艺方案、模具结构及关键零件的制造工艺，模具的使用效果和产品质量很好。     

湿式离合器充油过程动态特性研究

建立了使用脉宽调制数字比例溢流阀进行换档压力控制的湿式离合器充油过程的数学模型，用MSC Easy5进行了仿真计算。计算结果表明，脉宽调制数字比例溢流阀能满足车辆换档时对缓冲油压特性的要求，换档过程中油压平稳、可控。通过试验验证，计算结果与试验结果基本吻合，说明本文建立的数学模型正确。