浅析如何提升总装车间后桥四轮定位一次合格率

总装车间整车四轮定位检测和调整一直是瓶颈工位,为提高生产效率,文章通过分析后桥四轮定位误差来源,提出了一种后桥四轮定位闭环动态补偿方法。该方法以最小二乘法原理为基础计算整车后桥四轮定位最佳估计值,并对后桥四轮定位进行补偿。经过批量生产验证,本方法能够最大限度地提升总装车间整车后桥四轮定位检测一次合格率,对总装效能提升有较好效果。     

四轮定位工位操作分析

中顺汽车控股有限公司生产的SZS6503A轻型客车产品,在总装分厂的生产瓶颈是检测线上的四轮定位工序问题.通过对前一段生产任务分析,发现在检测线上"四轮定位"工位上积压的车辆最多,严重影响生产进度及分厂现场生产管理秩序.针对这一问题,现对"四轮定位"工位的具体操作流程及工艺路线进行分析研究.     

浅谈重型商用车非接触式四轮定位

重点介绍非接触式四轮定位应用于重型商用车检测过程中取得的一些经验和收获,包括四轮定位检测参数标准的制定、双后桥平行度的加垫调整原理及方法、双前桥转向机构的原理及平行度调整方法、车桥前束预调整方法在生产领域的应用以及通过试验探索车辆在不同状态下对各参数检测数据的影响等。     

创芯X3D三维数码摄像四轮定位仪技术研究

四轮定位仪作为一种检测仪器,是汽车维修中必不可少的设备,而传统的四轮定位技术已不能满足现代汽车四轮定位参数测量实时、在线、快速的要求。3D四轮定位技术具有非接触、操作简单、测量速度快等优点,代表了四轮定位参数测量技术的最新方向。文中介绍了汽车四轮定位参数测量技术的研究状况,分析了创芯X3D三维数码摄像四轮定位仪的原理及研究成果。     

四轮定位仪与前束调整台的应用

四轮定位仪和前束调整台是汽车检测线中常用的设备。四轮定位可对汽车主销倾角、轮胎倾角、前束等参数进行综合检测,配合调整参数,其测量精度较高,主要用于中高档汽车检测线中。前束调整台可对汽车前束进行检测,动态调整参数,其测量精度较低,主要用于低端车检测线中。前束调整台相对于四轮定位仪成本较低,在低端车生产中,用前束调整台代替四轮定位仪是较为普遍的现象。本文对四轮定位仪及前束调整台的测量原理、类别分别做了初步介绍。     

车轮定位调整的操作实例

通过前几期的介绍,相信对四轮定位的检测、调整及如何合理使用四轮定位仪,提高车轮定位服务质量有了一定的了解。下面笔者以国内几种常见的车型为例,讲述车轮定位各种故障的排除方法及调整的操作方法,供参考。     

乘用车四轮定位参数设计

四轮定位参数对车辆动态行驶性能至关重要,很多企业及工程人员对四轮定位参数的正向设计方法并不是太清楚。本文详细介绍了四轮定位参数设计和验证方法,并详细说明了其对布置和性能的影响,对底盘正向开发和后期调校优化具有借鉴意义。     

汽车四轮定位分析及检测

采用完全四轮定位方法和电脑四轮定位仪可使车辆定位参数得到最佳的测量，从而使车辆保证原设计功能。阐述了定位参数对转向操纵的稳定性，转向控制及轮胎磨损的影响，另外，介绍了四轮定位的优点。     

运动分析法诊断四轮定位故障

四轮定位状态的好坏对车辆的安全行驶及轮胎使用寿命等方面有着很大的影响。四轮定位的原理相对比较复杂，许多汽车维修人员对四轮定位故障产生的原理了解得很不够。即使是那些专门操作四轮定位检测设备的人员，往往也只是按照固定的规程操作设备并蚶车辆定位数据进行调整，而对四轮定位失调引起故障的原因也往往是一知半解。     

汽车四轮定位

简要分析了汽车四轮定位的概念，介绍了其内容和目的，概述了四轮定位不良对汽车轮胎、行驶性能的影响及汽车故障与四轮定位的关系。     

某车型车轮定位参数异常问题的分析和解决

车轮定位参数直接影响汽车操稳性和轮胎磨损情况。设计正确的定位参数,生产上更好地控制各个参数,对提高汽车行驶的安全性,获得良好的操控型和乘坐的舒适性有着极为重要的意义。文章从力学角度阐述了车轮定位的基本理论,深入分析了悬架高度,前束,外倾,主销后倾等之间的关系,强调了良好的定位参数设计和生产上精确地控制对于悬架以及整车的重要性。以某车型悬架高度测量值超差为实例,通过对悬架高度定义,悬架高度对四轮定位参数判定的影响,分析了定位参数对整车判定的影响。从测量,装配,零件质量三个大方面分别对影响悬架高度的的因素进行了逐一分析和排查,找到引起车高测量超差的原因。理论计算出了补偿值作为短期措施;在图纸无要求的情况下,通过反向测量进口零件的方法分析对修改零件做出了正确的推断,并通过试验验证了推断的正确性,通过修改弹簧连杆使得车高测量值超差问题最终得到了解决。此外,通过对潜在因素进行了逐一分析,从整车角度比较全面地分析了车高超差的原因,对于今后此类问题的解决提供了一个系统的参考方案。     

Force control for path following of a 4WS4WD vehicle by the integration of PSO and SMC

The aim of this paper is to present a novel control method for a four-wheel steer and four-wheel drive (4WS4WD) vehicle. The novelty is in the integration of sliding mode control (SMC) and particle swarm optimization (PSO) that is proposed to solve the control problem caused by the nonlinear, highly coupled and over-actuated characteristics of the four-wheel steer and four-wheel drive (4WS4WD) vehicle. The validity of the control method is evaluated by two criterions, namely path following performance assessed by the vehicle's position errors with respect to the reference path, and motion quality reflected by the smoothness of vehicle's velocities and accelerations. In vehicle modelling, a kinematic model and a dynamic model considering all slip forces are proposed for the controller design. Simulation results are provided to demonstrate the applicability of the proposed methodology and its robustness.     

基于微分几何的四轮独立驱动车辆运动解耦控制研究

针对车辆在纵向运动和横摆运动时的强耦合关系给车辆动力学控制带来的困难，以四轮独立电驱动车辆作为研究对象，基于微分几何理论设计了车辆系统运动解耦控制方法，将非线性强耦合的四轮驱动车辆动力学系统解耦为纵向和横向两个相对独立运动控制子系统，并设计了鲁棒控制器，以提高抵抗车辆行驶时不确定外力如侧风的干扰能力。基于 Trucksim 软件建立四轮驱动车辆模型，并针对车辆解耦控制策略和抗干扰策略进行了仿真测试。结果表明，相比于无解耦控制的车辆，采用微分几何解耦控制的四轮独立驱动车辆纵向速度偏差降低了 82.1%，横摆角速度偏差降低了80.7%，且微风干扰下的抗干扰能力明显改善，车辆稳定性显著提升。为验证该运动解耦控制策略在实时系统中的控制效果，还进行了硬件在环试验，结果表明，硬件在环试验的结果与仿真结果一致。     

长丰猎豹CFA2030汽车ABS故障诊断与检修

简述ABS的原理与作用,介绍四轮驱动的长丰猎豹CFA2030汽车ABS的组成,详细阐述该系统故障诊断及各部件故障检修。     

浅析PFMEA在总装车间生产制造中的应用

在车企总装车间车身装配过程中,内饰线、底盘线、总装线、四轮定位、返修各工段都有各自的失效模式,如果发生质量问题,就会导致花费大量时间检查,影响生产效率。文章结合车辆在路试过程中的后背门异响实际案例,运用PFMEA工具进行分析,找出导致后背门异响产生的原因,并且在前期的总装车间装配过程中进行工艺优化,在后续的工艺试验验证基础上,解决了后背门在路试过程中产生异响的质量问题,提高了车身稳定性及安全性。     

Application of Analytic Hierarchy Process to Stochastic Robustness Synthesis of Integrated Vehicle Controllers

This paper deals with the robust design procedure of integrated vehicle dynamics controller based on Stochastic Robustness Synthesis with use of a rational decision making process of the controller parameters. The basic control structure that integrates four-wheel steering and four-wheel torque control is determined using a nonlinear predictive control theory. The Analytic Hierarchy Process, a basic approach to decision making, is applied to determine the weight coefficients of robustness evaluation function of the controller. The desired vehicle dynamic performance is described as four-layer hierarchy structure and the design priority is determined with respect to several design criteria. The proposed design process produced a control system with excellent stability and performance robustness to vehicle parameter variations.     

Application of Analytic Hierarchy Process to Stochastic Robustness Synthesis of Integrated Vehicle Controllers

This paper deals with the robust design procedure of integrated vehicle dynamics controller based on Stochastic Robustness Synthesis with use of a rational decision making process of the controller parameters. The basic control structure that integrates four-wheel steering and four-wheel torque control is determined using a nonlinear predictive control theory. The Analytic Hierarchy Process, a basic approach to decision making, is applied to determine the weight coefficients of robustness evaluation function of the controller. The desired vehicle dynamic performance is described as four-layer hierarchy structure and the design priority is determined with respect to several design criteria. The proposed design process produced a control system with excellent stability and performance robustness to vehicle parameter variations.     

Two-Dimensional Motion of Four-Wheel Vehicles

This paper deals with two-dimensional motion of vehicles. Since the general four-wheel vehicle model is statically indeterminate, the motion of vehicles has been analyzed by replacing the vehicle with the equivalent two-wheel one proposed by E. Marquard. Because this approximation is based on the axisymmetry of vehicles, it causes significant errors in the general case. To improve the accuracy of the analysis of vehicle motion, a four-wheel model is suggested. In this model, it is assumed that the chassis remains in a flat plane during motion. By introducing this condition, the motion of the vehicle can be analyzed. Several results from the four-wheel model and the equivalent two-wheel model are shown for comparison, and the vehicle trajectories with time are discussed.     

Two-Dimensional Motion of Four-Wheel Vehicles

This paper deals with two-dimensional motion of vehicles. Since the general four-wheel vehicle model is statically indeterminate, the motion of vehicles has been analyzed by replacing the vehicle with the equivalent two-wheel one proposed by E. Marquard. Because this approximation is based on the axisymmetry of vehicles, it causes significant errors in the general case. To improve the accuracy of the analysis of vehicle motion, a four-wheel model is suggested. In this model, it is assumed that the chassis remains in a flat plane during motion. By introducing this condition, the motion of the vehicle can be analyzed. Several results from the four-wheel model and the equivalent two-wheel model are shown for comparison, and the vehicle trajectories with time are discussed.