浅析汽车制动跑偏

汽车制动跑偏是汽车制动时离开原来的前进方向自动向右或向左偏驶,驾驶员无法控制方向。制动跑偏一般大致可分为3种情况：有规律定向跑偏、无规律跑偏及突然跑偏。究其主要原因,一般说来各制动器的制动力矩差值的百分数越大并组合到同一车桥上时,制动跑偏的可能性越大,下面对制动跑偏的原因进行分析。     

客车制动跑偏的原因分析与处理方法

阐述了制动跑偏现象及危害;分析了客车制动跑偏的主要原因;给出了客车制动跑偏的处理方法。     

浅析汽车制动跑偏

汽车制动跑偏是指：汽车制动时离开原来的前进方向自动向右或向左偏驶，驾驶员无法控制方向。制动跑偏一般大致可分为三种情况：一、有规律定向跑偏。二、无规律跑偏。三、突然跑偏。究其主要原因一般说来各制动器的制动力矩差值的百分数越大，佐右转向轮的制动摩擦力矩不等）并组合到同一桥上时，制动跑偏的可能性就越大，也就是说各车轮的制动力矩差越大。并组合到同一车桥或同一侧时制动跑偏故障的发生率越高，下面就制动跑偏的原因进行分析。     

汽车制动跑偏与侧滑

详述汽车制动跑偏、侧滑的现象及危害；分析常见汽车制动跑偏、侧滑的主要原因；提出汽车制动跑偏、侧滑的预防措施。     

客车制动跑偏问题研究

制动时汽车的方向稳定性是影响交通安全的一个重要因素。本文针对客车在行车制动过程中发生跑偏的问题,从产品结构和制动原理上分析制动跑偏的原因,并进行实例分析,为客车转向桥研发和制动跑偏维修提供参考。     

汽车制动跑偏的原因分析

制动突然跑偏 制动突然跑偏对汽车安全行驶的影响最大,这种故障虽然为数不多,但其危害极大,稍有不慎则可能造成严重后果,应引起驾驶员高度重视.制动突然跑偏的原因主要有:某侧钢板弹簧固定螺栓松动而突然发生移动,使前桥与后桥不能保持平行而制动跑偏;某侧车轮制动管路突然失灵,如管路受挤压或碰撞而产止凹瘪使制动液或压缩空气不能顺利通过,或因铁锈或污物过多而堵塞引起制动跑偏.在汽车保养时应对以上可能出现的情况经常检查.     

基于K&C台架解决商用车制动跑偏问题

悬架与转向系统的硬点匹配对商用车的制动跑偏问题有非常重要的影响。本文首先从制动过程受力的角度，分析了制动跑偏产生的机理；其次，基于有限元软件建立了某车型前悬架和转向系统仿真模型，并分析了不同悬架与转向系统硬点方案对制动跑偏的影响；然后，利用商用车前悬架K&C试验台，对选取的仿真优化方案进行台架验证；最后，对选取的台架优化方案进行整车制动跑偏试验，并基于整车试验不跑偏的方案，总结出了避免制动跑偏的仿真分析和K&C台架试验管控指标。     

汽车制动跑偏的原因和故障排除

针对汽车在行车过程中制动跑偏的问题,从产品结构和制动原理上分析制动跑偏的原因和预防。     

汽车制动跑偏和制动侧滑安全分析

运用力学的方法，分析了汽车制动跑偏和制动侧滑的机理及其与行车安全的关系，提出了防止制动跑偏和制动侧滑的基本方法。     

汽车制动跑偏的原因与排除

汽车制动跑偏,是指汽车在制动时自动偏向一方,驾驶员无法控制前进方向,很可能造成严重事故。汽车制动跑偏的原因很多,必须针对跑偏的一些具体现象,进行分析,找出故障所在,并予以排除,以消除事故隐患。     

Combined control of a regenerative braking and antilock braking system for hybrid electric vehicles

Most parallel hybrid electric vehicles (HEV) employ both a hydraulic braking system and a regenerative braking system to provide enhanced braking performance and energy regeneration. A new design of a combined braking control strategy (CBCS) is presented in this paper. The design is based on a new method of HEV braking torque distribution that makes the hydraulic braking system work together with the regenerative braking system. The control system meets the requirements of a vehicle longitudinal braking performance and gets more regenerative energy charge back to the battery. In the described system, a logic threshold control strategy (LTCS) is developed to adjust the hydraulic braking torque dynamically, and a fuzzy logic control strategy (FCS) is applied to adjust the regenerative braking torque dynamically. With the control strategy, the hydraulic braking system and the regenerative braking system work synchronously to assure high regenerative efficiency and good braking performance, even on roads with a low adhesion coefficient when emergency braking is required. The proposed braking control strategy is steady and effective, as demonstrated by the experiment and the simulation.     

CVT混合动力汽车再生制动控制策略与仿真分析

分析了混合动力汽车制动过程中发动机反拖制动和CVT速比控制对车辆再生制动性能的影响,提出了低制动强度下仅由电机再生制动、高制动强度下电机与制动器共同制动和紧急制动时发动机参与制动的再生制动策略。对典型工况进行了再生制动仿真,仿真结果表明,CVT速比控制可使电机运行在高效区,从而获得了比传统手动变速混合动力汽车更好的制动能量回收效果。     

An integrated control strategy for the composite braking system of an electric vehicle with independently driven axles

For an electric vehicle with independently driven axles, an integrated braking control strategy was proposed to coordinate the regenerative braking and the hydraulic braking. The integrated strategy includes three modes, namely the hybrid composite mode, the parallel composite mode and the pure hydraulic mode. For the hybrid composite mode and the parallel composite mode, the coefficients of distributing the braking force between the hydraulic braking and the two motors' regenerative braking were optimised offline, and the response surfaces related to the driving state parameters were established. Meanwhile, the six-sigma method was applied to deal with the uncertainty problems for reliability. Additionally, the pure hydraulic mode is activated to ensure the braking safety and stability when the predictive failure of the response surfaces occurs. Experimental results under given braking conditions showed that the braking requirements could be well met with high braking stability and energy regeneration rate, and the reliability of the braking strategy was guaranteed on general braking conditions.     

拖挂式房车制动稳定性的研究

在建立6自由度拖挂式房车转弯制动数学模型的基础上,对拖挂式房车的制动过程进行了仿真计算,分析了转向角、转向角速度和房车车轮制动力对房车横摆角速度的影响以及各参数之间的协调优化。为寻求房车车轮制动力与转向角、转向角速度、制动时间等因素的最优关系,达到拖挂式房车在行驶过程中实时控制房车制动力,提高拖挂式房车行驶的稳定性奠定了基础。     

某汽车气压制动系统制动反应时间的测试及分析

汽车制动反应时间是汽车制动系统的重要性能参数之一,是影响汽车制动距离的主要因素之一。本文对某汽车气压制动系统进行制动反应时间测试,并分析其制动系统特性。     

基于制动意图的电动汽车复合制动系统制动力分配策略研究

文中对制动意图的识别和不同制动意图所要求的不同的制动力分配策略进行研究.通过试验,验证了制动意图识别算法和制动力分配策略的可行性和有效性,为复合制动系统的应用奠定了基础.     

Anti-Skid Braking of a Tractor-Semitrailer Truck

This paper describes a study of anti-skid braking and the effects of such braking on the handling behavior and braking performance of a tractor-semitrailer truck. The truck, represented by a digital computer model having fourteen degrees of freedom, is taken to be in a cornering maneuver that involves braking and driver steering. Conventional braking or one of three types of anti-skid braking is used in the maneuver. The results show that the effects of anti-skid braking on the handling behavior and braking performance of the truck are beneficial. The results also show that the behavior of the wheels and the handling behavior and braking performance of the truck depend on the type of anti-skid braking used.     

Transient switching control strategy from regenerative braking to anti-lock braking with a semi-brake-by-wire system

Regenerative braking is an important technology in improving fuel economy of an electric vehicle (EV). However, additional motor braking will change the dynamic characteristics of the vehicle, leading to braking instability, especially when the anti-lock braking system (ABS) is triggered. In this paper, a novel semi-brake-by-wire system, without the use of a pedal simulator and fail-safe device, is proposed. In order to compensate for the hysteretic characteristics of the designed brake system while ensure braking reliability and fuel economy when the ABS is triggered, a novel switching compensation control strategy using sliding mode control is brought forward. The proposed strategy converts the complex coupling braking process into independent control of hydraulic braking and regenerative braking, through which a balance between braking performance, braking reliability, braking safety and fuel economy is achieved. Simulation results show that the proposed strategy is effective and adaptable in different road conditions while the large wheel slip rate is triggered during a regenerative braking course. The research provides a new possibility of low-cost equipment and better control performance for the regenerative braking in the EV and the hybrid EV.     

纯电动汽车制动能量回收系统关键技术现状分析

文章以制动能量回收控制策略为核心,展开制动能量回收系统关键技术现状分析。首先重点阐述制动能量回收前后轴制动力与电-液制动力分配原则与技术要点。其后提出电机性能、储能装置性能状态、再生制动系统结构、行驶工况四类关键因素对制动能量回收的影响,并对其关键技术的研究现状进行综合分析。最后提出制动能量回收系统未来的研究方向。     

电动汽车再生制动的滑移率控制

以不改变电动汽车原有机械制动系统结构和控制方式为前提,提出一种并联式混合制动滑移率控制方法.该方法明确划分了再生制动控制和原有机械制动控制的作用工况.将再生制动控制转化为滑移率规划和控制两个问题,并设计了滑模控制器.分析和仿真结果显示,在不同强度、不同方式及存在参数不确定性下制动,该方法都可以实现再生制动和机械制动的准确控制及平顺过渡.