Braking Force Distribution Control for Improved Vehicle Dynamics and Brake Performance

This paper describes the feasibility of improving the braking performance of a commercial vehicle by using an electronic braking system. An electronic braking system enables the braking force at each wheel to be independently controlled. Braking force distribution control makes the braking force at each wheel proportional to each wheel's load. Results of computer simulation and vehicle test showed that the proposed control laws can eliminate the effects of a laden condition on the braking distance and can increase the degree of deceleration at which wheel lock occurs, resulting in improved vehicle attitude stability during a critical maneuver.     

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.     

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.     

汽车列车电控制动系统制动力分配的控制算法

为汽车列车提出了一种基于滑移率的电控制动系统制动力分配算法,即根据不同情况,使牵引车后轮和半挂车车轮的目标滑移率随牵引车前轮滑移率而变化.运用Matlab/Simulink和Trucksim软件进行列车在高附着和低附着路面上行驶的联合仿真,结果表明该算法能缩短汽车列车的制动距离,提高了制动稳定性.     

Effect of Traction Force Distribution Control on Vehicle Dynamics

The purpose of this study is to clarify vehicle dynamics effected by traction force distribution, not only between the front and rear wheels but also between the left and right wheels. Contribution of traction force distribution to vehicle turning performance was investigated using a mathematical simulation and an experimental vehicle. The results indicates that the control of traction control distribution between the left and right wheels greatly influences vehicle turning characteristics and improve the performance even in a marginal turning condition.     

汽车制动防抱死与电子制动力分配的探讨

介绍了汽车制动防抱死系统 (ABS)和电子制动力分配系统 (EBD)的组成和工作原理 ,分析了两者的联系与区别。     

Effect of Traction Force Distribution Control on Vehicle Dynamics

SUMMARY

The purpose of this study is to clarify vehicle dynamics effected by traction force distribution, not only between the front and rear wheels but also between the left and right wheels. Contribution of traction force distribution to vehicle turning performance was investigated using a mathematical simulation and an experimental vehicle. The results indicates that the control of traction control distribution between the left and right wheels greatly influences vehicle turning characteristics and improve the performance even in a marginal turning condition.     

基于理想制动力分配曲线的复合制动设计

以理想制动力分配曲线为目标,在车辆液压制动力分配系数保持不变的情况下,研究了前后液压制动力和再生制动力分配的比例关系,确定了制动力分配控制策略;在确保液压制动力分配系数满足法规要求的情况下,以最优制动力分配为目标优化了整车结构参数。     

Improved Vehicle Performance Using Combined Suspension and Braking Forces

This work presents a preliminary investigation into the integration of particular subsystems of an automobile's chassis. The specific focus of this research is the integration of Active Suspension components with Anti-Lock braking (ABS) mechanisms. The performance objective for the integrated approach is defined as a reduction in braking distance over just anti-lock brakes. Several models, of varying degrees of complexity, are presented to determine the effect of modeling accuracy on the potential performance improvement. In the most detailed model, a four degree of freedom Half Car vehicle model is developed along with models for a hydraulic Active Suspension and an ABS system. For both subsystems, actuator dynamics are included. The tire-road interface is modeled using the Magic Formula tire model. Individual controllers are developed for the subsystems and a governing algorithm is constructed to coordinate the two controllers. Simulations of the integrated controller and an ABS system, for each system model, demonstrate a significant increase in performance.     

发动机制动对汽车制动性能的影响分析

发动机制动对整车的制动效能和制动的方向稳定性能都会产生影响,在设计前后车轮制动力分配时必须要考虑这一因素。基于制动法规和实际使用要求,分析了发动机制动对汽车制动性能的一些影响,并推导出发动机参与制动时利用附着系数的计算公式,在此基础上通过具体实例,试验分析了制动效能和方向稳定性的几点问题。     

基于电动汽车制动效能一致性的并联式制动能量回收控制

并联式制动能量回收系统的控制策略一般是固化的函数曲线,由当前车速直接确定出再生制动转矩,并未考虑制动踏板开度这一因素,驾驶员的制动感觉较差。为了衡量驾驶员的制动感觉,提出了电动汽车制动效能一致性的概念,即驾驶员以不同制动踏板开度在不同初速度下进行制动。在采用电- 液复合制动与只采取传统液压制动时,二者所得出的制动加速度和制动距离分布的差异情况,差异越小则代表电动汽车制动效能一致性越好。在AMEsim 和simulink 软件联合仿真环境下,建立并联式制动能量回收系统模型和电动汽车整车模型,通过引入制动踏板开度修正系数对再生制动力矩进行标定,提出了一种基于制动效能一致性的制动能量回收转矩的控制方法。仿真结果显示,该方法能够取得与传统液压制动系更为接近的制动效能和制动感觉,同时较现有并联式回收系统控制策略的能量回收效率提高了5.9%,具有一定的工程应用价值。     

低附着弯道路面车辆制动力控制策略研究

分析了车辆ABS系统在弯道制动时存在的横向稳定性问题,提出了一种低附着弯道路面车辆制动力控制策略.它综合考虑车轮防抱死与车辆发生侧滑时所能承受的最大侧向力,根据两者所允许的最大制动力中较小值确定施加于车辆的制动力.所进行的数值仿真结果表明该控制方法能提高车辆在低附着弯道路面上的横向稳定性.     

二轴汽车轴间制动力分配的计算及评价方法

对整车制动性能进行设计时,有必要对汽车轴间制动力的分配进行计算分析和评价,以判定前后轴制动力的分配是否合理。     

New Control Technique for Maximizing Braking Force on Antilock Braking System

In this paper, we propose a new control strategy for an antilock braking system (ABS) to maintain the braking force at maximum. The popularization of the ABS that prevents the wheels from locking has resulted in an improvement of the vehicle stability and shortening of the braking distance. Further improvement is anticipated if the maximization of the braking force is realized. We found an interesting phenomenon in which the characteristics of the resonance system composed of the vehicle body and the wheel and road surface reflects the slip condition of the road surface. Using this phenomenon, we realized a control method for maintaining the maximum value of the braking force.     

盘式制动器制动性能试验台部分检测系统

通过对摩托车液压盘式制动器的工作原理、电路原理、机械部分和软件部分的研究,设计出可测量液压盘式制动器手柄力、钳口力及点灯行程的在线检测系统.研制结果表明,该测试系统测试精度高、速度快、方法简便,能对产品进行百分百的在线检测.     

New Control Technique for Maximizing Braking Force on Antilock Braking System

In this paper, we propose a new control strategy for an antilock braking system (ABS) to maintain the braking force at maximum. The popularization of the ABS that prevents the wheels from locking has resulted in an improvement of the vehicle stability and shortening of the braking distance. Further improvement is anticipated if the maximization of the braking force is realized. We found an interesting phenomenon in which the characteristics of the resonance system composed of the vehicle body and the wheel and road surface reflects the slip condition of the road surface. Using this phenomenon, we realized a control method for maintaining the maximum value of the braking force.     

轿车制动性能道路试验研究

对某国产轿车进行了制动系统的道路试验研究,基于现有的试验设备,搭建试验测试系统,试验所测量的参数主要有制动减速度、制动距离、制动踏板力,制动液压系统管路压力等。试验结束后,依据制动系统的评价指标和标准要求对试验结果进行分析,对该车制动性能进行综合评价,为企业后续的研究和改进提供依据。     

电动汽车机电复合制动力分配策略

对某电动汽车机电复合制动系统进行了研究,制定了电动汽车机电复合制动系统的结构方案。依据ECE-R13法规与最大电机制动力限制,确定机电解耦门限值,对小强度制动、中强度制动及紧急制动3种不同工况分别制定了不同的再生制动与液压制动控制策略,并进行仿真与试验验证。结果表明,在小强度制动时电机可满足驾驶员的需求制动力,并且能量回收率能够达到25%;在中强度制动时电机以最大制动力进行制动并且在最大回收能量的同时能够使该系统满足制动性能,能量回收率能够达到74%;在紧急制动时为了制动安全应迅速将电机制动力撤出。该复合制动系统能够有效地吸收再生制动能量,同时也能满足车辆的制动性能。     

对制动标准中关于轿车轴间制动力分配要求的探讨

本文通过17辆典型轿车制动力分配的计算,对ZBT24和GB7258标准中关于轿车制动力分配的要求进行了较为全面的比较、分析和评价。分析结果表明,与GB7258标准相比,ZBT24标准对轿车制动力分配的要求制定得更为完善合理。为了进一步完善GB7258标准,本文对GB7258标准有关轿车制动力的要求提出了修改的初步建议。