飞思卡尔FXTH87系列助保隆科技推出全球最小的胎压监测系统模块

正汽车轮胎智能监测系统(TPMS)与汽车安全气囊、防抱死制动系统(ABS)作为汽车三大安全系统已经广泛为大众认可并逐渐普及,TPMS相关产品与技术近年来迎来了发展的机遇期。尤其是随着全球相关的法规开始实施——例如,2007年美国强制所有车辆配备TPMS,欧盟也要求从2014年使用TPMS,世界各国陆续加入强制执行TPMS的行列。     

飞思卡尔FXTH87系列助保隆科技推出超小型胎压监测系统模块

汽车轮胎智能监测系统（TPMS）与汽车安全气囊、防抱死制动系统（ABS）作为汽车三大安全系统已经广泛为大众认可并逐渐普及,TPMS相关产品与技术近年来迎来了发展的机遇期。尤其是随着全球相关的法规开始实施——例如,2007年美国强制所有车辆配备TPMS,欧盟也要求从2014年使用TPMS,世界各国陆续加入强制执行TPMS的行列。     

汽车ABS防抱制动特性及其不解体检测技术研究

汽车ABS防抱死装置是一种典型的机、电、液一体化设备,它极大地提高了车辆的制动性能,使车辆的运行保持较好的稳定性和操控性,ABS检测技术能够检测防抱死装置制动性能是否达标。因此,研究汽车ABS防抱死装置的制动特性及其不解体检测技术有十分重要的意义。     

MC33289型驱动器在汽车制动系统中的应用

随着汽车行驶速度的提高,道路行车密度的增大,对于汽车行驶安全性能的要求也越来越高.汽车的防抱死制动系统（ABS）就是在这种要求下产生和发展的.MC33289是Motorola公司推出的智能模拟电路中的高端驱动器.文中详细介绍它的功能,内部结构及工作原理,并给出它在汽车防抱死制动系统（ABS）中的应用.     

电子机械制动控制系统研究

随着机械电子技术的发展,传统的液压制动系统逐渐被电子机械制动技术所取代。电子机械制动控制系统采用先进的电子机械制动技术,并结合防抱死制动系统一起应用于汽车制动控制系统中。文章对电子机械控制系统的特点及构成进行了分析,对防抱死制动系统的特点及应用进行研究,在此基础上建立了基于防抱死制动系统的电子机械制动控制系统的结构框架,并对基于防抱死制动系统的电子机械制动控制系统框架的设计进行了分析和研究。     

基于英飞凌液压ABS电子控制器酏研究与设计

引言 汽车防抱死制动系统（AntilockBrakingSystem,ABS）是机电一体化系统,属于汽车主动安令系统。ABS可以防止车辆拜紧急制动时发生车轮抱死,从而出现转向失灵、侧滑或甩尾等安全事故,可以在很大程度上提高车辆的安全性。     

电子控制ABS系统的非线性理论分析

汽车防抱死制动系统是指在制动过程中,自动调节车轮制动力,防上车轮抱死以取得最佳制动效能的电子装置,简称ABS(Auto-1ock braking system).由于汽车制动过程具有明显的非线性、时变性和不确定性等特点,因此ABS的非线性变化分析非常重要.ABS是目前世界上普遍公认的提高汽车制动安全系统的方法之一.主要研究ABS系统制动力的非线性变化,从而提出改进对策.     

汽车电子防抱死制动系统的日常维护使用

应用ABS能有效地提高汽车 的行驶安全能力，彻底分析了电子式防抱死制动系统的控制原理和过程。     

汽车安全应用中多种传感器技术融合催生自主型汽车

汽车工业正在寻找保护驾驶员和乘客安全的创新方法，从一些小幅度地增强安全性能开始，最终目标是创建完全的自主型汽车。汽车工业在防抱死制动系统、电子稳定性控制、多个安全气囊以及最近出现的后视摄像头系统等安全功能应用方面出现了高速增长。     

电子机械制动系统的设计与应用研究

电子机械制动系统是汽车中不可或缺的一个重要控制系统,该系统的性能稳定与否直接关系到车辆的运行安全性。为此,在对该系统进行设计时,应当充分考虑车辆的安全运行需要,同时还要保证系统自身运行的可靠性。基于此点,本文首先简要阐述了电子机械制动系统的基本设计要求,在此基础上重点对电子机械制动系统关键模块的设计进行论述。期望通过本文的研究能够对车辆制动性能的提升有所帮助。     

一种基于双目视觉的安全车距测量方法

为了加强智能交通系统建设,提出了车载视频在辅助驾驶系统中的应用.首先提出了视频终端的4项基本功能,即车内视频监控、辅助驾驶、可视倒车系统、视频娱乐系统,其中车内视频监控、可视倒车、辅助驾驶是智能交通建设车辆端的重要功能.接着采用双目视觉方式实现汽车的辅助驾驶,详细分析了如何对安全车距进行预警和制动.最后进行测距步骤及测距结果分析.实验证明,该方法适合安全车距测量,具有广阔的应用前景.     

一种基于DMA的汽车制动检测台驱动电机控制策略

在利用滚筒反力式制动性能检测台对汽车制动性能进行检测的过程中,由于粘砂滚筒附着系数较高,汽车在制动时,轮胎与滚筒之间会产生很大的摩擦力,容易发生剥胎现象。因此,合理采集汽车制动性能相关参数的同时,及时关停制动性能检测台驱动电机以保证被检车辆的安全,成为汽车制动性能检测的关键技术之一。通过对现有的汽车制动性能检测中各种控制方法优缺点的比较,提出了一种基于DMA的汽车制动检测台驱动电机控制方法,提高了控制的实时性和灵活性,在采集到汽车制动性能相关参数的同时,最大限度地保护了车辆安全。试验结果表明,该控制策略稳定有效,检测精度高,具有较高的实用性。     

Nonlinear MPC-based slip control for electric vehicles with vehicle safety constraints

This paper presents a new slip control system for electric vehicles (EVs) equipped with four in-wheel motors, based on nonlinear model predictive control (nonlinear MPC) scheme. In order to ensure vehicle safety, wheel slip stable zone is considered as time-domain constraints of the nonlinear MPC. Besides, the motor output torque is limited by the motor maximum torque, which varies with motor angular velocity and battery voltage, so the motor maximum output torque limitation is considered as system time-varying constraints. The control objectives include: vehicle safety, good longitudinal acceleration and braking performance, preservation of driver comfort and lower power consumption. This paper utilizes nonlinear MPC to solve this complex optimization control problem subject to the constraints, and the vehicle safety objective is achieved by wheel slip stable zone constraints, the other objectives are realized by adding additional cost functions. In addition, a penalty on the slack variables is also added to ensure that the state constraints (wheel slip) do not cause infeasible problems. The effectiveness of the proposed controller is verified in the off-line co-simulation environment of AMESim and Simulink, and a rapid control prototyping platform based on Field programmable gate array (FPGA) and dSPACE is completed to evaluate the real time functionality and computational performance of the nonlinear MPC controller.     

Automobile Brake-by-Wire Control System Design and Analysis

The automobile brake-by-wire (BBW) system, which is also called the electromechanical brake system, has become a promising vehicle braking control scheme that enables many new driver interfaces and enhanced performances without a mechanical or hydraulic backup. In this paper, we survey BBW control systems with focuses on fault tolerance design and vehicle braking control schemes. At first, the system architecture of BBW systems is described. Fault tolerance design is then discussed to meet the high requirements of reliability and safety of BBW systems. A widely used braking model and several braking control schemes are investigated. Although previous work focused on antilock and antislip braking controls on a single wheel basis, we present a whole-vehicle control scheme to enhance vehicle stability and safety. Simulations based on the whole-vehicle braking model validate a proposed fuzzy logic control scheme in the lateral and yaw stability controls of vehicles.     

Optimal robust control of a contactless brake system using an eddy current

As vehicle speed increases, a more powerful brake system is required to ensure vehicle safety and its reliability. A contactless eddy current brake (ECB) is developed to take the superior advantages of fast anti-lock braking to the conventional hydraulic brake systems. Braking torque analysis is performed by using an approximate theoretical model and the model is modified through experiments to have a more reliable result. Designs of an ECB for a scaled model for demonstration and actual vehicle model are performed. Optimal torque control which minimizes a braking distance is achieved by maintaining a desired slip ratio corresponding to the road condition. Optimal controller which is robust to the varying road friction coefficients is designed by using a sliding mode controller. Simulation and experimental results for a scaled model are presented to investigate the performance of a contactless ECB.     

Development of vehicle maneuvering system for autonomous driving

Recently, autonomous driving technology has received significant interest, and consequently, various autonomous driving algorithms have been developed by researchers. An experimental (conventional) vehicle verifies the strategy for autonomous driving by testing the performance and feasibility of the corresponding algorithms. Implementation of the autonomous driving strategy in the conventional vehicle system requires modification of the electronic control unit (ECU); however, this is limited by security issues and the high cost of development.In this paper, a maneuvering system that can control the steering angle, braking force, and accelerating signal so that autonomous driving does not operate via the ECU is proposed. Because the steering angle is an important factor in terms of the vehicle motion behavior, a robust angle controller based on the disturbance observer is adopted. Moreover, to ensure safety and user convenience, a user intention recognition algorithm is proposed. Based on this algorithm, the maneuvering system can be disabled during control without using any perception sensor. Finally, several experiments are conducted to evaluate the functions of the maneuvering system. A scenario-based driving test is also performed to verify the feasibility of the maneuvering system.     

SS系列机车制动工况及轮对椭圆化在线监测的研究与实现

提出了一种ss系列机车制动工况及轮对椭圆化在线监测的研究,利用两个位移传感器实时检测制动器传动装置的位移量、车轮轮箍踏面的位移量,通过工控机计算以实现对制动工况中的缓解、制动情况、闸瓦磨损情况、轮箍磨损及轮对椭圆化情况的在线监测;以便于及时处理制动工况中的不良问题,保证行车的安全。通过MATLAB软件仿真了轮对椭圆化检测的变化曲线,验证了研究中对轮对椭圆化情况在线监测的可行性。     

紧急停车系统在地铁车辆中的应用

为了在列车自动保护系统（ATP）失效的状态下,还能为地铁车辆提供最后的安全保护,本文采用了符合国际标准ISO15693的13.56MHz射频识别（RFID）技术,设计并实现了一套独立于ATP的紧急停车系统（ESS）,通过安装在车底的天线对安装于轨道内的标签完成识别,进而触发紧急制动回路断开,确保车辆安全停止于轨道末端之前.该系统通过了运行试验和现场鉴定,可以满足在恶劣环境下的车辆可靠识别和安全停车,确保乘客的生命安全.     

Novel Regenerative Braking Control of Electric Power-Assisted Wheelchair for Safety Downhill Road Driving

This paper describes a novel regenerative braking control scheme of electric power-assisted wheelchairs for safety driving on downhill roads. The ldquoelectric power-assisted wheelchairrdquo which assists the driving force by electric motors is expected to be widely used as a mobility support system for elderly people and disabled people; however, it has no braking system to suppress the wheelchair's velocity and brings the dangerous and fearful driving particularly on downhill roads. Therefore, this paper proposes a novel safety and efficient driving control scheme based on the regenerative braking system. This paper applies the regenerative braking system with the step-up chopper circuit serially connecting two motors and realizes the velocity feedback control with the variable duty ratio so that it tracks the optimal velocity based on the minimum Jerk model. In addition, the dynamic braking system is also applied at the low-speed range instead of the regenerative braking in order to suppress the acceleration. Some driving experiments on the practical downhill roads show the effectiveness of the proposed control system.