气压制动系统响应时间优化设计

随着商用车的发展,消费者对车辆安全性的要求越来越高。制动响应时间是评价气压制动系统性能的重要指标,研究缩短制动响应时间的方案意义重大。试验表明,通过优化气压制动系统的选型及布置能有效提升制动响应时间,缩短制动距离,提高整车安全性。文章从气压制动系统管路布置及优化选型等多方面进行分析,并结合试验数据论证影响制动响应时间的因素,固化一些优化方案。     

应急用锚调整艏向和制动

通过正反两个实例、两种结果，说明在进出港航道中突发船舶失控时为避免继发其他严重事故，船长应当机立断采取最佳行动。     

两种新型汽车制动器惯性测功机

本文介绍了两种新型汽车制动器惯性测功机，一种是高模拟式，一种是多功能式，前者可准确模拟汽车的制动工况和测定各项性能参数，特别适用于产品研究与开发；后者是专为执行国内外制动器及衬片试验法规和标准而研制的，它除了具有制动器惯性测功机功能外，尚具有ＫＲＡＵＳＳ和ＣＨＡＳＥ两种衬片材料试验机功能。     

基于道路和台架的制动器振动噪声试验方法研究

介绍了汽车制动器振动噪声试验方法的研究状况,针对基于整车的道路试验和基于试验台的台架试验,从试验方法的特点及适用性、评价方法、具体试验操作程序、测试手段及数据分析与处理等方面对两种试验进行了阐述和对比分析,指出了制动器振动与噪卢试验方法的发展趋势.     

单片机控制的电阻制动控制器的设计与应用

作者介绍了用单片机控制的WTDZ—1型内燃机车电阻制动控制器的性能特点,设计思想,应用情况。该控制器已于1997年1月通过了铁道部产品质量检验中心机车车辆检验站的检验。     

Influence of shock absorber wearing on vehicle brake performance

In order to safely maintain a vehicle, it is necessary to verify the most important systems that affect safety during Periodic Motor Vehicle Inspections (PMVIs). In a previous paper, a test method and validation criteria were suggested by the authors to verify shock absorber status during PMVIs, as they are a fundamental component that may wear out during a vehicle’s life. In this paper, variations of the performance of the vehicle’s brakes resulting from shock absorber wearing have been analyzed, in order to confirm whether the suggested criteria is valid for taking into account longitudinal forces and pitch movement on the vehicle. A simulation-based study was conducted with several configurations of a worn damper on a vehicle driving on two virtual roads: smooth and undulating. The results confirmed that the damping coefficient established as an acceptable value to verify the shock absorber status in PMVIs is also valid considering the forces involved in a braking maneuver.     

Vehicle stability control system for enhancing steerabilty,lateral stability,and roll stability

The Vehicle stability control system is an active safety system designed to prevent accidents from occurring and to stabilize dynamic maneuvers of a vehicle by generating an artificial yaw moment using differential brakes. In this paper, in order to enhance vehicle steerability, lateral stability, and roll stability, each reference yaw rate is designed and combined into a target yaw rate depending on the driving situation. A yaw rate controller is designed to track the target yaw rate based on sliding mode control theory. To generate the total yaw moment required from the proposed yaw rate controller, each brake pressure is properly distributed with effective control wheel decision. Estimators are developed to identify the roll angle and body sideslip angle of a vehicle based on the simplified roll dynamics model and parameter adaptation approach. The performance of the proposed vehicle stability control system and estimation algorithms is verified with simulation results and experimental results.     

动面生锈对低里程制动抖动现象的影响研究

基于某车型持续出现的低里程制动抖动现象的调查研究,分析了该车型出现低里程制动抖动的可能性原因。通过盐雾处理模拟制动盘自然锈蚀过程,并实车路试再现了该车型低里程制动抖动发生过程,提出了制动面生锈不均匀是造成低里程制动抖动的主要原因的结论。     

轿车制动性能的控制方法

针对目前轿车开发以逆向开发为主体,对整车制动性能控制能力较弱的实际问题,文章提出了一套制动性能控制方法,即以整车设计参数、制动强制性法规适应性及制动系统零部件尺寸系列化等为制动性能控制的输入约束条件,在设计初期预测新开发轿车的9项主要制动性能,经过多辆轿车制动系统的开发实践验证,此性能控制方法不仅可保证制动系统设计质量,而且缩短了轿车制动系统的设计周期。     

摩托车制动器拖滞力矩的研究

拖滞力矩主要是摩擦力矩,不但损坏零件,还容易造成盘式制动器抱死,发生意外事故,增加燃油消耗。当拖滞力矩为2Nm时,燃油消耗将增加3.1%-5。7%;当拖滞力矩为3Nm时,燃油消耗将增加4.6%-8.5%。通过实际测试,摩托车制动器的拖滞力矩在调试时应控制在0.5Nm以下为好。