汽车防抱制动系统性能试验研究与分析

ABS系统与车辆的匹配是一个亟待解决的课题。为了优化针对ABS系统性能的试验方法,通过一系列不同道路附着系数、不同车辆行驶速度及车辆负荷的工况下,做了相关道路试验,以验证ABS系统的性能,并根据对车辆制动减速度和车轮转速的监测结果,验证试验方法的规范性,提出了增加车辆横摆角度和横摆角速度以评价车辆制动性能的建议。     

浅谈ABS在某轻型卡车上的应用

介绍了ABS在某轻型卡车上的匹配应用,通过试验数据对比分析,说明ABS对车辆制动性能及稳定性带来的改进与提高。     

猎豹牌CJY6470E轻型客车ABS试验研究

制动防抱死系统(ABS)是提高车辆制动性能和行车安全性的重要装置。文章通过对CJY6470E轻型客车ABS制动防抱死系统的试验,分析ABS的正常与非正常工作条件下车轮的线速度变化曲线,并判断ABS与车型的匹配状态。     

某轻型混合动力军用越野车动力系统匹配

本文基于混合动力军用越野车的特殊工况需求,对动力系统的功率、扭矩等要求进行了分析,对动力系统总成选型条件进行了完善。对不同工况下对驱动电机的功率、扭矩需求分别进行了分析。最后以此为基础对某轻型混合动力军用越野车的动力系统进行了匹配。匹配结果显示,相关指标达到要求,相对同吨位传统车辆,加速性能显著提高。     

某越野车ESP系统ESP OFF功能优化设计

针对某匹配分时四驱分动器的越野车,对ESP系统中的ESP OFF功能进行优化设计,满足车辆状态需求及不同客户驾驶需求。     

某越野车车身稳定系统匹配设计与试验研究

过硬的横向稳定杆会限制车辆的越野能力,因此某些车型为了保障越野能力而选用较软的横向稳定杆,便导致了越野车侧倾刚度不足的问题。针对这一问题设计了一套可取代横向稳定杆的车身稳定系统,用于在不影响车辆越野性能的同时增加车辆的侧倾刚度。通过建立整车及液压系统动力学模型进行数值运算仿真,以求得能和整车匹配的车身稳定系统的关键参数。然后根据该车的底盘结构对系统进行结构设计,并开发出了原型样机进行装车试验。通过对原装越野车和改装越野车进行悬架性能试验、蛇行试验和平顺性试验,并对结果作对比分析,验证了车身稳定系统可以大幅度提高车辆动态侧倾刚度,改善其操纵稳定性且并不影响平顺性。     

使用朗仁H6远程进行名爵GS锐腾变速器匹配

车辆信息:2016年名爵GS锐腾。案例背景:车辆更换变速器电脑后需要做匹配学习,朗仁技术中心工程师利用远程协助帮助维修人员完成匹配学习。该车型有以下常用功能:ABS的压力传感器学习、间接式胎压系统重置、偏航传感器学习、ABS加液排气;电动转向系统的电动助力转向系统学习;AFS动态前照灯水平调节系统的DHL高度传感器零位电压自学习。     

基于STM32单片机的车辆胎压监测系统设计

准确实时地监测车辆行驶过程中轮胎状态对行车安全至关重要。目前的胎压监测系统大多价格较高,研发较困难,且对于某些特定车辆的需要,如沙地方程式赛车等需频繁换胎的车辆不具有通用性,传感器匹配程序繁琐,使用极为不便。因此设计了基于STM32单片机的车辆胎压监测系统,能够准确监测轮胎状态信息,具有很好的可靠性,且能够快速完成传感器与轮胎的匹配,可以更好地满足越野车、沙地方程式等车辆频繁换胎的需求,有很强的通用性。     

某特种越野车制动性能研究

某特种越野车采用气顶液制动系,制动结构复杂,相应ABS的开发所需成本高、周期长,为了提高整车制动性能,通过分析其制动特征和不同ABS的选配方案及布置形式,选配、安装合适的ABS.     

基于Cruise的越野车动力匹配技术研究

越野车动力匹配技术是越野车性能开发的一项重要内容。本文根据某型越野车总体设计指标,采用基础理论公式计算的方法,初步选定越野车动力传动系统参数,然后利用Cruise软件进行整车动力性、经济性仿真,根据仿真计算得到的动力性、经济性数据,对比整车动力性、经济性设计指标,以此验证该车型动力匹配的合理性。道路试验结果证明了利用Cruise软件进行越野车动力性经济性仿真分析的准确性,并进一步验证了该车型动力匹配的合理性。论文对越野车动力匹配能力建设具有一定的指导作用。     

AMT换挡过程的离合器控制

电控机械式自动变速器(AMT)的离合器控制是AMT开发中的一项关键技术。系统地分析了换挡过程中离合器接合特性及其对换挡品质评价指标的影响。以冲击度最大值为约束条件,以减少离合器滑摩功为原则,提出了离合器接合的控制策略。将该控制方法应用于某越野车上,对车辆换挡过程进行实时控制,试验结果表明该控制方法有效地提高了车辆的换挡品质,满足了军用越野车辆对行驶平顺性的要求。     

重型汽车低附着路面制动稳定性的仿真研究

文章利用trucksim重型汽车动力学仿真软件,对六轮双轴重型汽车在低附着路面左右车轮附着系数不一致情况下进行紧急制动的行驶工况进行了仿真研究。研究结果表明在低附着路面进行紧急制动时,对制动轮进行制动压力控制,有ABS控制的重型汽车比没有ABS控制的重型汽车具有更好地行驶稳定性。但在低附着路面上,有ABS控制的重型汽车比没有ABS控制的重型汽车的制动距离增加了很多,这对重型汽车的行车安全性非常不利。     

Experimental investigations on continuous regenerative anti-lock braking system of full electric vehicle

Functions of anti-lock braking for full electric vehicles (EV) with individually controlled wheel drive can be realized through conventional brake system actuating friction brakes and regenerative brake system actuating electric motors. To analyze advantages and limitations of both variants of anti-lock braking systems (ABS), the presented study introduces results of experimental investigations obtained from proving ground tests of all-wheel drive EV. The brake performance is assessed for three different configurations: hydraulic ABS; regenerative ABS only on the front axle; blended hydraulic and regenerative ABS on the front axle and hydraulic ABS on the rear axle. The hydraulic ABS is based on a rule-based controller, and the continuous regenerative ABS uses the gain-scheduled proportional-integral direct slip control with feedforward and feedback control parts. The results of tests on low-friction road surface demonstrated that all the ABS configurations guarantee considerable reduction of the brake distance compared to the vehicle without ABS. In addition, braking manoeuvres with the regenerative ABS are characterized by accurate tracking of the reference wheel slip that results in less oscillatory time profile of the vehicle deceleration and, as consequence, in better driving comfort. The results of the presented experimental investigations can be used in the process of selection of ABS architecture for upcoming generations of full electric vehicles with individual wheel drive.     

中重型商用车装用ABS对制动器热衰退的影响

分析了中重型商用车装用ABS系统对制动器抗热衰退性能的影响,并结合实车试验结果分析,提出了装用ABS的制动系统时,应尽可能的采用高热容量的制动器和辅助制动系统等建议。     

Modeling and Analysis of Automotive Antilock Brake Systems Subject to Vehicle Payload Shifting

The steerability and stability of vehicles must be maintained during emergency stopping and evasive driving maneuvers on degraded road surfaces. The introduction of antilock brake and traction control systems (ABS/TCS) has expanded the envelope of safe vehicle operation for the majority of drivers. These mechatronic systems combine an electronic controller with wheel speed sensors, an electro-mechanical hydraulic brake actuator, and in some instances, engine intervention through the engine control unit, to regulate wheel slip. The development of ABS systems has traditionally depended on extensive in-vehicle testing, at cold weather proving grounds, which contribute to lengthy product development cycles. However, recent attention has been focused on the use of simulation and hardware-in-the-loop strategies to emulate test conditions in a controlled setting to shorten product design time and methodically address critical safety issues. In this paper, the effect of transient load shifting due to cargo movement on ABS performance in light-duty vehicles will be investigated. Analytical and empirical mathematical models are presented to describe the chassis, tire/road interface, wheel, brake modulator, and cargo dynamics. Two strategies, a model-free table lookup and model-based discrete nonlinear controller, are presented to regulate the ABS modulator's operation. These vehicle and controller dynamics have been integrated into a simulation tool to investigate the effect of transient weight transfers on the vehicle's overall stopping distance and time. Representative numerical results are presented and discussed to quantify the ABS systems' performance for various loading and operating conditions.     

ABS在重型卡车上的应用分析

用户对行车安全的重视、国家法规对车辆制动系统安全性的要求,促使了ABS的诞生。从上世纪80年代至今,ABS已经发展成熟并普及成为车辆制动系统的必须部。本文对ABS的基本工作原理和ABS在重型卡车上的应用进行了详细阐述,并对未来ABS的发展趋势进行了展望。     

Prediction of antilock braking system condition with the vehicle stationary using a model-based approach

An Antilock Braking System (ABS) is one of the most important safety facilities equipped in modern vehicles. A self-test is therefore embedded into its ECU to identify any electronic malfunction. However there is no effective method to predict or check its mechanical conditions routinely to ensure its functionality. Because the ABS system is merely actuated above a particular speed in emergency stops, the current brake test facilities are not adequate for ABS test. Because of the dangers involved it would not be acceptable to use a public road to implement such a practice for fault detection so an alternative means must be sought. To provide a safe and convenient solution this paper proposes a novel method to predict ABS faults whilst the vehicle is stationary. In this situation a model-based approach is applied to predict various faults from the ABS, especially from its hydraulic subsystem. As such, a mathematic model is developed to describe the operating processes of ABS including possible faulty conditions. An autonomous control strategy is also designed to actuate the control module independently without the knowledge of the control algorithms embedded in an ABS control module. This approach is evaluated through a Simulink simulation.     

ABS齿圈和传感器的应用技术

主要阐述作为ABS信号输入的关键部件，齿圈和传感器的技术参数的选择和在整车上的匹配设计方法，为降低ABS常见故障的发生率提供技术前提。     

Wheel slip control with torque blending using linear and nonlinear model predictive control

Modern hybrid electric vehicles employ electric braking to recuperate energy during deceleration. However, currently anti-lock braking system (ABS) functionality is delivered solely by friction brakes. Hence regenerative braking is typically deactivated at a low deceleration threshold in case high slip develops at the wheels and ABS activation is required. If blending of friction and electric braking can be achieved during ABS events, there would be no need to impose conservative thresholds for deactivation of regenerative braking and the recuperation capacity of the vehicle would increase significantly. In addition, electric actuators are typically significantly faster responding and would deliver better control of wheel slip than friction brakes. In this work we present a control strategy for ABS on a fully electric vehicle with each wheel independently driven by an electric machine and friction brake independently applied at each wheel. In particular we develop linear and nonlinear model predictive control strategies for optimal performance and enforcement of critical control and state constraints. The capability for real-time implementation of these controllers is assessed and their performance is validated in high fidelity simulation.