关于EPB轮速小线设计与研究

电子驻车制动系统EPB是汽车线控制动系统的一类,以电子制动器代替传统手制动器。本文主要对电子驻车制动系统电气控制部分的EPB制动卡钳电机与ABS轮速传感器非集成式与集成式的线束进行研究与设计开发。主要介绍EPB线束非集成式与集成式的基本结构,阐述EPB轮速线在整车环境中的总体布置方案,为EPB轮速线的性能验证提供实验方法。按照系统电控部分的硬件功能要求,以及车辆参数采集点模块的电控系统要求,本文为电子驻车制动系统线束的开发提供了一套理论设计依据、布局方案,以及试验方法、验证规范。     

电子驻车制动系统(EPB)的控制策略与试验评价方法

文章详细阐述了电子驻车制动系统(EPB)的结构类型、扩展的子功能、控制策略和功能试验评价方法。对EPB系统的夹紧与释放功能的前提条件和自动驻车系统(Auto Hold)的制动压力保持与释放逻辑,以及Auto Hold与EPB进行功能转交的策略进行深入的分析与研究,并研究Auto Hold和自动启停系统的协同工作控制策略。基于研究的控制策略制定出用于整车集成开发的电子驻车制动系统各子功能的试验评价方法。     

2019款比亚迪宋DM车电子驻车系统维修模式释放与夹紧的操作方法

元征X-431 PAD V是一款具有"智能诊断"和"在线编程"功能的高端汽车故障诊断工具,具有特殊功能多、车型覆盖广、测试数据准、诊断功能强等特点。在线编程无需原厂账号,不产生费用,对车辆ECU无损害。功能说明对于配备电子驻车(EPB)系统车型,在更换后轮制动摩擦片前,需要先对EPB系统进行维修模式释放,以完全释放制动卡钳,便于更换制动摩擦片;更换制动摩擦片后再对EPB系统进行维修模式夹紧,以使制动卡钳调整到最佳制动状态。     

东风标致3008电子驻车制动系统FSE结构与原理

神龙汽车有限公司生产的东风标致3008都市SUV轿车于2013年1月上市销售,在所有级别车型上均配备电子驻车制动系统,该系统作用在后制动卡钳上. 电子驻车制动系统具有以下功能:①驻车制动;②紧急制动(动态制动);③切断点火后的自动制动施加;④当车辆驶离时的自动制动释放;⑤停车时监控车辆的移动. 通过多功能显示屏可以取消自动制动施加和释放功能(根据车型).如要手动释放电子驻车制动,在点火开关接通时,踩下制动踏板并拉电子驻车制动控制拉杆.如果点火开关断开,则无法释放驻车制动.如果驾驶员忘记驻车制动且驾驶员侧车门打开,系统将发出报警声并在多功能显示屏上显示提示信息.     

布雷博:推出全新ECS制动卡钳

正布雷博(Brembo)在2017上海车展上发布全新ECS制动卡钳。这款由全铝材质打造的制动卡钳拥有创新的轻量化设计,将装配在全新Alpine A110上。轻质铝材设计多项功能集成得益于布雷博减速电机的应用,轻量化设计的全新ECS制动卡钳兼具行车制动功能和机电驻车制动功能。此项技术是EPB(电子驻车制动)系列的最新科技。EPB系列包括EP独立制动卡钳和早几年前推出的Extrema制动卡钳。ECS制动卡钳拥有卓越的制动性能,摩擦材料的进一步优化助力卡钳在任何温度、任何条件下取得非凡的制动表现。     

EPB制动钳拖滞性能分析

随着电控技术的发展,电子驻车制动(EPB)被动参与汽车保持静止的场景越来越多,驻车后的残余制动拖滞性能影响制动钳的能耗、汽车的燃油经济性和续航里程。文中通过对某车型液压拖滞和驻车拖滞性能的研究,分析驻车拖滞的特性,解析EPB释放后制动拖滞现象比大多数液压制动拖滞更恶劣的原因。     

浅谈汽车的电子驻车制动系统

电子驻车制动系统的结构特点及工作原理电子驻车制动系统是在传统手动机械驻车制动系统的基础上发展起来的一种由电子控制方式实现停车制动的技术。传统的手动机械驻车系统是通过驾驶员操纵驻车手柄,再由拉线等机械连接,带动制动蹄片张开或制动卡钳活塞移动．来实现两后轮的抱死,进而完成驻车。电子驻车系统的工作原理与手动机械驻车制动系统一样。     

基于PID控制的坡道起步控制仿真与试验研究

针对汽车坡道起步过程中的驻车制动力释放滞后问题,提出了坡道起步过程中气压式电子驻车系统的PID控制方法。首先,在AMEsim中建立了简化的气压式电子驻车系统模型,进行驻车制动释放过程的仿真,并通过实车试验,验证了模型的正确性。接着提出了坡道起步过程中气压式电子驻车制动系统的PID控制方法,根据坡道阻力和发动机驱动力算得目标气压,搭建了气压式电子驻车系统的PID控制模型,并进行了坡道起步过程的仿真和实车试验验证。结果表明,所提出的电子驻车制动系统的PID控制方法能准确控制驻车制动气压值随目标气压的变化,驻车制动释放及时,有效解决了驻车制动力释放滞后的问题,达到良好的坡道起步效果。     

EPB释放时间偏长问题研究

EPB是实现车辆自动驻车、释放等功能的部件。其作用是防止车辆在平路或者坡道上溜车。相对普通手驻车制动更加智能、高效。左右EPB卡钳电机分别执行驻车、释放等功能,其结构复杂,同时驻车、释放等功能由软件控制,其涉及驻车释放的一致性等问题。本文以某车型投放市场初期产生的释放时间偏长问题,通过对软件和结构硬件进行了深入研究,分析出卡钳密封圈尺寸超设计以及软件的释放时阈值的设置不合理是导致上述问题的根本原理。通过风险评估、技术改进等步骤,彻底解决了该问题,为后续产品开发提供了技术支撑。     

浅析电控机械驻车制动系统

为了提高驻车制动的响应速度,防止溜车,确保驻车安全,以及为汽车提供坡道起步时所需的制动力,汽车电控机械驻车制动系统（EPB）的应用日渐普及。该系统将行车过程中的临时紧急制动和停车后的长时驻车制动功能整合在一起,把传统的驻车系统改为电机驱动,驾驶员只需按下按钮就能实现驻车制动。对于这一新技术,     

Fault detection and diagnosis of the electromechanical brake based on observer and parity space

In the future, the conventional hydraulic brake system in automobiles will be removed and replaced by an electrically operated brake system called brake-by-wire. The brake-by-wire units, such as the EMB (Electro-Mechanical Brake), provide better braking performance by directly controlling the brake motor and are environmentally friendly because they do not use hydraulic fluid. For implementation of the EMB systems, reliable and robust fault detection and diagnosis methods become increasingly important. In this study, a sensor fault diagnosis method is proposed with parity space and observer approaches to detect faults in the motor current sensor, speed (or position) sensor and clamping force sensor. The proposed method is verified through a closed-loop simulation using Matlab/Simulink, and the simulation result is compared with the HILS bench test results.     

机电控制CVT电控电动执行机构参数设计方法（双语出版）

为了使机电控制无级变速器（CVT）能够可靠地传递转矩，快速地调节速比，结合某车型的结构性能参数，对机电控制CVT电控电动执行机构的设计方法进行研究。首先，对机电控制CVT电控电动执行机构的结构和工作原理进行分析，说明电控电动执行机构对CVT速比和从动带轮夹紧力的调节方法，从运动学和动力学的角度研究从金属带式无级变速器的传动机理，获得速比与主动带轮可动盘位移的关系以及保证主、从动带轮可靠传递转矩所需要的夹紧力；然后，根据整车的结构性能参数，明确汽车对机电控制CVT的功能需求和性能要求，以电控电动执行机构中直流电动机的负载转矩最小为目标，设计确定各碟形弹簧的参数和组合形式，在此基础上确定电控电动执行机构中电动机械传动系统的结构性能参数；最后，为验证所设计电控电动执行机构参数的正确性，利用所建立的机电控制CVT传动系统模型在ECE工况下对电控电动执行机构的性能进行仿真分析。结果表明：相对传统CVT液压执行机构，在ECE工况下机电控制CVT电控电动执行机构消耗的能量减少52.2%，同时设计的电控电动执行机构在ECE工况下能够实现实际夹紧力和速比对目标值的良好跟随。     

Design and implementation of a new clamping force estimator in Electro-Mechanical Brake systems

In this paper, an improved clamping force estimator is proposed for Electro-Mechanical Brake (EMB) systems by using the motor rotor position information and the hysteresis characteristics of mechanical parts in the EMB. A cascaded type of a force/position control system with a force sensor or an estimator was designed and implemented to control the clamping force and to keep the clearance gap in EMB systems. The EMB Hardware-In-the-Loop-Simulation (HILS) results show that the proposed force estimator yields better estimation performance than the existing estimator and that the clamping force control system based on the estimator can be also used for the fault tolerant control of the system.     

Parallel model based fault detection algorithm for electronic parking brake system

This paper describes a parallel model-based fault detection algorithm for an electronic parking brake (EPB) system, which consists of an electronic control unit with built-in current sensor and braking force sensor. For the EPB system to supply sufficient parking force to a vehicle, the parking force sensor is of utmost importance. If a fault occurs in this sensor, sufficient parking force may not be supplied, thereby seriously threatening the safety of the vehicle. Thus, a fault detection method is required for the parking force sensor of the EPB system to improve the safety of vehicles. For this purpose, a highly reliable fault detection method is needed to detect abnormal fault signals, which cannot be detected by the existing on-line sensor monitoring fault detection methods. This paper proposes a novel parallel model-based fault detection algorithm for the EPB system, which compares the physical sensor data with the mathematical model, the fuzzy model, and the neural network model at the same time. In order to reduce false alarms, the magnitude of thresholds and the operation counts are changed adaptively. When the proposed parallel model-based fault detection algorithm detects severe failures of the force sensor, it warns the driver in advance to prevent accidents due to the failures. The proposed algorithm is verified by hardware-in-theloop simulations in various situations.     

Development of control logic for hydraulic active roll control system

Developed in this research is a control logic for the ARC (Active Roll Control) system that uses rotary-type hydraulic stabilizer actuators at the front and rear axles. The hydraulic components of the system were modeled in detail using AMESim, and a driving logic for the hydraulic circuit was constructed based upon the model. The performance of the driving logic was evaluated on a test bench, and it demonstrated good pressure tracking capability. The control logic was then designed with the target of reducing the roll motion of the vehicle during cornering. The control logic consists of two parts: a feedforward controller that generates anti-roll moments in response to the centrifugal force, and a feedback controller that generates anti-roll moments in order to make the roll angle to follow its target value. The developed ARC logic was evaluated on a test vehicle under various driving conditions including a slowly accelerated circular motion and a sinusoidal steering. Through the test, the ARC system demonstrated successful reduction of the roll motion under all conditions, and any discomfort due to the control delay was not observed even at a fast steering maneuver.     

Clamping performance of fastener in windshield wiper assembly using theoretical and experimental methods

Improper clamping of wiper arms can cause problems in the operation of the wiper. An excessive clamping force can cause damage to the wiper arm head. On the other hand, an insufficient clamping force can cause self-loosening of the nut. Given the lack of direct research on the clamping force of the fastener in wiper assembly, this study verifies the existing clamping performance of the fastener in windshield wiper assembly by theoretical and experimental methods. The theoretical calculation results show that all the clamping performance are satisfied under the general snow load condition. However, under the critical load condition, maximum assembly preload and safety margin against slipping are in disagreement with the standard values. This problem is solved by increasing the strength grade of the bolt. The experimental results show a reducing tendency of the clamping force during the snow durability test. However, this reducing clamping force during the 60,000 test cycles is acceptable. In the case of nut reusing more than two times possibly cause a problem of its loosening because of insufficient clamping force. Therefore, it is recommended that the nut should not be reused more than two times.     

分布式驱动电动汽车回馈制动失效的液压补偿控制

分布式驱动电动汽车各驱动轮转速和转矩可以单独精确控制，便于实现整车动力学控制和制动能量回馈，从而提升车辆的主动安全性和行驶经济性。但车辆在回馈制动过程中，一旦1台电机突发故障，其他电机产生的制动力矩将对整车形成附加横摆力矩，从而造成车辆失稳，此时虽可通过截断异侧对应电机制动力矩输出来保证行驶方向，但会使车辆制动力大幅衰减或丧失，同样不利于行车安全。为了解决此问题，提出并验证一种基于电动助力液压制动系统的制动压力补偿控制方法，力图有效保证整车制动安全性。以轮毂电机驱动汽车为例，首先建立了整车动力学模型以及轮毂电机模型，通过仿真验证了回馈制动失效的整车失稳特性以及电机转矩截断控制的不足；然后，建立了电动助力液压制动系统模型，并通过原理样机的台架试验验证了模型的准确性；接着，基于滑模控制算法设计了制动压力补偿控制器，并在单侧电机再生制动失效后的转矩截断控制基础上完成了液压制动补偿控制效果仿真验证；最后，通过实车试验证明了所提控制方法的有效性和实用性。研究结果表明：在分布式驱动电动汽车单侧电机再生制动失效工况下，通过异侧电机转矩截断控制和制动系统的液压主动补偿，能够使车辆快速恢复稳定行驶并满足制动强度需求。     

干式复合带无级自动变速器系统与速比电机控制策略的研究

介绍了一种干式复合带无级自动变速器(A-CVT)的结构及T作原理。该变速器不仅减少了成本昂贵、结构复杂的液力或电液装置，还改善了汽车的燃油经济性和发动机的排放。利用装有A-CVT的MatizⅡ轿车为试验车开发了A-CVT的电控系统，并对A-CVT中速比电机的控制策略进行了较为详细的讨论。在MatizⅡ轿车上长时间的试用和测试表明，该电控系统使样车基本达到了原车的性能指标。     

独立式EPB结构设计与仿真分析

本文通过计算汽车在不同坡度上驻车时所需要驻车力的大小,设计独立式EPB结构,并通过对独立式EPB结构中主要部件螺栓和卡钳嵌体的受力仿真分析,验证整个结构最大应力位置及所选用的材料满足设计要求,总结出独立式EPB卡钳钳体可以进行轻量化设计,适应现今汽车轻量化的发展趋势。