途观电子机械驻车故障的排除与思考

<正>VIN:LSVUL65N1C2××××××。故障现象:该车驻车制动器故障灯常亮。当电子机械驻车启动后,左后轮依旧可以自由的转动。故障诊断:根据客户反映的情况,维修技师首先用举升机托起车辆,悬空4个轮后,维修人员拉起电动驻车按钮,能清晰听到两后轮驻车电机运转的声音,右后轮电机工作一下马上停止,右后轮被抱死,而左后轮电机工作的声音则不会停止,在左后轮抱死的一瞬间,左后轮电机继续工作,工作噪音持续几秒钟后,左后轮被再次松开,左后轮因此可以继续旋转。途观全系使用了电子机械式驻车制动机构,该驻车机构操作非常便捷,只需用手指轻轻拉一下电控机械     

桑塔纳轿车制动性能分析及改进措施

用户对桑塔纳轿车制动系统反映比较普遍的两个问题是：制动力略感不足，行驶过程中遇到紧急情况往往不能迅速制动，即所谓“站不住”的感觉；制动踏板有沉重感，即制动操纵不轻便，因而直接影响制动效能的正常发挥。针对这两种现象，分析其产生原因并提出具体改进措施。1后轮制动器的改进桑塔纳轿车前轮采用的是盘式制动器，后轮制动器因兼起驻车制动器的作用，故采用鼓式制动器。原车型设计者可能基于后轮先制动抱死的危害大于前轮先制动抱死，故为克服后轮先制动抱死，在结构设计中保证：制动过程中后轮产生的制动力小于前轮产生的制动力…     

都灵—V汽车后轮驻车制动器的特点与维修（与后轮盘式制动器配用）

众所周知，驻车制动是汽车必备的制动装置之一。依维柯二代产品的驻车制动装置，是由驻车制动机械操纵机构与后鼓式制动器组合而成。这样的结构，使后鼓式制动器不仅是行车制动器，而且还起到了驻车制动作用。随着后轮盘式制动器的运用，都灵-V汽车的驻车制动器将会随着后轮制动器动型式而变化。若后轮采用鼓式制动器，则基本维持原二代产品的结构；     

现代中重型柴油汽车制动管路中继动阀技术状况的检查

继动阀的作用 首先是可以就近将中、后轮制动气室或弹簧制动缸内压缩空气很快排至大气，以利于中、后轮制动气室迅速解除制动．或弹簧制动缸内被压缩的弹簧能迅速释放能量而产生驻车制动；其次是中、后轮制动时或驻车制动与解除时，可使储气筒内压缩空气不必经主制动控制阀或驻车制动控制阀而就近经继动阀充入中、后轮制动气室，使制动器迅速实现制动，或充入弹簧制动缸推动活塞压缩弹簧使制动器迅速解除制动。     

新型电子驻车鼓式制动器匹配设计与功能验证

基于传统领从蹄式鼓式制动器,开发了一种新型的电子驻车鼓式制动器.首先,对电子驻车鼓式制动器的总体机电系统方案进行了设计,然后,对其传动机构和自锁机构的关键参数进行了匹配设计,并对自锁机构进行了 CAE强度分析,最后,基于MATLAB/Simscape软件完成了驻车制动性能的整车应用仿真,结果表明,该电子驻车鼓式制动器能...     

液压盘式制动器驻车机构的研究

本文指出了液压盘式制动器驻车机构的优势和设计难点所在；分析了一款常见驻车机构的工作原理和过程，并与另外一款驻车机构进行了对比。最后，对驻车制动力和驻车行程进行了分析计算，提出了液压盘式制动器驻车机构的共通性。     

DTQ6400轻型客车驻车制动传动机构的分析和改进

在分析论述ＤＴＱ６４００轻型客车驻车制动传机构所在的问题及其影响因素的基础上，提出了改进方案，并自行设计，研制了一种新型结构。经试验证明，这种新的制动传动机构的结构简单，易维修，易调整，是切实可行的。     

缓速器对汽车制动稳定性的影响

装有缓速器的汽车在制动时,其制动性不能用理想制动器制动力分配曲线(I曲线)来评价,但对I曲线稍作修改并结合传统的分析方法,仍可以对汽车的稳定性进行分析.文章通过前后轮制动器制动力的关系式,得出关于路面附着系数的一元二次方程,通过该方程解的情况来分析制动稳定性.分析结果表明,为了保证汽车制动时的稳定性,施加在后轮上的缓速器制动力不宜过大,并且通过适当调整制动器制动力分配系数,可以提高汽车的制动稳定性.     

依维柯汽车制动系统元件—滞后阀

依维柯S系列轻型汽车制动系统采用真空助力的液压双管路制动机构,即前轮为四缸固定钳体式盘式制动器,后轮为双向自增力式、自动调隙的鼓式制动器。为了改善整车的制动效果,还分别在前、后轮制动管路中装有滞后阀和感载阀,后者可根据汽车的装载量无级调整后轮管路的油压,以便相应地改变后轮制动力,使汽车在不同装载质量的     

汽车制动检验台的评述（二）

滚筒反力式制动检验台的评价。滚筒反力式制动检验台在检测过程中不受驾驶员操作状况的影响，检测工况稳定，检测结果可靠，多次检测的重复性好；检测时是滚筒推动车轮转动，因此，它可检测车轮阻滞力和驻车制动力；检测过程可包括制动器作用阶段和持续制动阶段，故可检查车轮的制动蹄摩擦片与制动鼓接触配合状态，判断制动鼓的圆度。     

反力式制动试验台加载能力与检验结果真实性的分析

利用反力式制动试验台对前、后轮的加载能力进行了分析，并得出如下结论：（1）因存在系统的微观自激振动，致使滚筒对车轮的加载能力在一定范围内不停地波动；（2）加载能力一般不低于轴荷的60％，对于后轮行车制动力的检验，试验台加载能力的下限值可能低于60％；（3）为使后轮驻车制动力检验的加载能力不低于整车重力的20％，试验台应设置限制车辆后移的辅助设施，以提高驻车制动力的加载能力。     

Co-operative control for regenerative braking and friction braking to increase energy recovery without wheel lock

This paper presents a regenerative braking co-operative control algorithm to increase energy recovery without wheel lock. Considering the magnitude of the braking force available between the tire and road surface, the control algorithm was designed for the regenerative braking force at the front wheel and friction braking force at the rear wheel to be increased following the friction coefficient line. The performance of the proposed regenerative braking co-operative control algorithm was evaluated by the hardware in the loop simulation (HILS) with an electronic wedge brake on its front wheels and an electronic mechanical brake on its rear wheels. The HILS results showed that a proper braking force on the front and rear wheels on a low μ road prevented the lock of the front wheels that was connected to the motor, and maintained the regenerative braking and increased energy recovery.     

轿车前后轴制动力平衡分布研究

基于大量轿车前后轴制动力实测数据，运用数理统计手段，研究确定国产主要轿车前后轴制动车平衡分布规律及分布参数，进而建立相应车型的前后轴制动力平衡分布计算模型，本文研究对从统计规律上掌握国产轿车前后轴承动力平衡性能和准确地计算相应的分布数值具有十分重要的意义。     

Improvement of Vehicle Dynamics by Rear Braking Force Control

A study on effective use of rear braking force to improve a brake performance and vehicle dynamics are carried out. On a ordinary condition, the rear braking force could be more increased to a conventional braking force distribution. Based on this thought, the brake performances are estimated. The results show the effects not only improve the brake performance but also reduce a pitching at braking and moderate a vehicle OS behavior in a turn during braking. These are verified by experimental test vehicle equipped with a rear braking force control system.     

Improvement of Vehicle Dynamics by Rear Braking Force Control

SUMMARY

A study on effective use of rear braking force to improve a brake performance and vehicle dynamics are carried out. On a ordinary condition, the rear braking force could be more increased to a conventional braking force distribution. Based on this thought, the brake performances are estimated. The results show the effects not only improve the brake performance but also reduce a pitching at braking and moderate a vehicle OS behavior in a turn during braking. These are verified by experimental test vehicle equipped with a rear braking force control system.     

Feedback brake distribution control for minimum pitch

The distribution of brake forces between front and rear axles of a vehicle is typically specified such that the same level of brake force coefficient is imposed at both front and rear wheels. This condition is known as ‘ideal’ distribution and it is required to deliver the maximum vehicle deceleration and minimum braking distance. For subcritical braking conditions, the deceleration demand may be delivered by different distributions between front and rear braking forces. In this research we show how to obtain the optimal distribution which minimises the pitch angle of a vehicle and hence enhances driver subjective feel during braking. A vehicle model including suspension geometry features is adopted. The problem of the minimum pitch brake distribution for a varying deceleration level demand is solved by means of a model predictive control (MPC) technique. To address the problem of the undesirable pitch rebound caused by a full-stop of the vehicle, a second controller is designed and implemented independently from the braking distribution in use. An extended Kalman filter is designed for state estimation and implemented in a high fidelity environment together with the MPC strategy. The proposed solution is compared with the reference ‘ideal’ distribution as well as another previous feed-forward solution.     

盘式制动器在轿车后轮上的应用

为更好地提高汽车产品的市场竞争力,汽车安全性能成为竞争焦点。文章介绍了盘式制动器与传统鼓式制动器相比较后的优点、后轮用盘式制动器的类型特点及传统的盘式制动器与具有驻车功能的盘式制动器的区别。说明具有驻车制动功能的盘式制动器能为现代轿车和商务车提供安全可靠的制动性能。盘式制动器已经在国内外许多品牌轿车上得到了广泛的应用。     

某驱动桥气室失效问题的分析及改进

气室是驱动桥的重要组成部分,通过压缩空气和蓄能弹簧为制动器提供驱动力,从而实现整车的行车制动和驻车制动。如若气室发生故障,则会造成制动失效,影响整车的行驶安全。文章针对某驱动桥试验过程中出现的气室底部撕裂问题,通过运用机械振动、有限元分析等方法,对其失效模式进行剖析,通过改进方法,提升产品可靠性。     

前后车轮制动器制动力矩的分配

探讨了前后车轮制动器力矩分配对轮式机械制动性能的影响,就如何确定合理的前后轮制动器的分配比值进行了分析,最后确定出了合理的前后轮制动力距.     

轿车轴间制动力分配要求的试验研究

本文在切诺基吉普车实车试验的基础上，结合其它轿车的试验结果，对制动标准中有关轿车轴间制动力分配的要求进行了研究。结果表明，为获得良好的制动稳定性，较高的制动效能，增加前轴制动力，减少后轴制动力是现代轿车轴间制动分配设计的发展趋势；要求过大的后轴制动力，在常遇路面上强力制动，将会导致后轮首先抱死，与ＥＣＥＲ１３要求不相符。