一种新型双动双腔真空器增压器

ＥＱ１０６０Ｆ轻型载货汽车的制动系统最初采用单腔制动总泵加真空增压器及安全缸的半双管路结构，为了提高安全性，后采用双膜片真空加力器的双管路结构，为了适应使用要求，又改为两个真空增压器的方案，但仍存在结构复杂，接头环管多，易泄漏，自由行程过大，超载行驶时，感到制动动力不足等问题，现采用一种新设计方案，以双控制动总泵输出油压为控制源，用真空动力缸增压机构，以双进，双出，双活塞的泵体为辅助缸，实现单真空     

真空增压制动系统的发展与应用

真空增压制动是中，轻型载货汽车普遍采用的制动助力结构。我国最早采用的真空增压制动是仿日本五十铃ＴＤ系列的结构，为单制动总泵与单真空增压器及安全缸相结合的结构，随后又采用了串联制动总泵加双真空增压器的结构，这两种结构形式在可靠性，安全性，合理性等方面存在着不同强度的缺陷，因此，现在已采用一种新型的真空增压器为增压制动主要结构，以满足制动系统的结构，性能方面的多重要求。     

上海别克轿车盘式制动系统维修

该车制动系统结构有如下特点：采用较大缸径(25mm)的制动总泵，前分泵缸径为63mm。后分泵缸径为38mm，都大于国内其它轿车制动总泵和分泵的尺寸。从而保证在制动时有足够大的制动力，使制动更加迅速、可靠；采用双膜真空助力器，助力器直径为280mm，使制动更为安全、可靠；前后车轮制     

用真空表检测液压制动系统伺服机构的故障

许多现代轻型汽车、面包车、轿车的液压制动系统，为了减轻踏板力，提高制动总泵（主缸）的输出压力，都装用了真空助力器、真空增压器等伺服机构，以达到改善制动性能和降低劳动强度的目的。但是，若对这部分了解不够，一旦出现故障。不仅会使制动可靠性下降，还会因查找故障不当，造成人力和物力的浪费。     

汽车真空增力制动系统

汽车气制动系统中,空压机功率和管路气压损耗是一个定值。要使制动力进一步提高,若仅从改进管路布置或阀门结构是难以有效提高的;但如新增一个能使汽车制动气室前后腔形成真空负压的系统,就能解决这个问题。1.真空增力制动系统原理图1a是一个活塞将缸分成为A、B两腔,B与大气相通,A为真空,A、B两腔就存在真空负压差,活塞受     

NJ1060型汽车液压制动真空增压系统常见故障的诊断与排除

ＮＪ１０６０型汽车的液压制动装置中加装了制动加力装置。由真空泵、６６－ＩＶ型真空增压器、安全缸总成组成液压制动真空增压系统。该系统常见的故障有：６６－Ⅳ型真空增压器增压作用不足；制动踏板发硬（踩不动）。１６６－Ⅳ型真空增压器增压作用不足１．１故障原因 真空源故障，真空度不足；真空增压器控制阀的真空阀、空气阀不密封；真空增压器真空加力室皮膜破损等。１．２故障分析 ６６－Ⅳ型真空增压器由增压油缸（通称辅助缸，下同）、控制阀、真空加力气室（通称动力缸，下同）构成。控制阀于真空增压器上呈横卧状配置，内部由…     

切诺基吉普车制动系的检查与调整

北京切诺基吉普车的制动系统有行车制动系与驻车制动器两大部分.行车制动系采用双管路真空助力液压系统,它主要由串联式制动总泵、真空助力器、前后分立双管路系统、组合阀(压差阀、比例阀)、前后液压轮缸(分泵)、前盘后鼓式制动器等组成.该车制动系在正常使用中,各部件的技术状态与部位间隙会逐渐发生变化,当达到一定程度时,就会影响安全行车.因此,应定期对制动系进行检查与调整.     

用真空表检测液压制动系统伺服机构的故障

许多现代轻型汽车、面包车、轿车的液压制动系统,为了减轻踏板力,提高制动总泵(主缸)的输出压力,都装用了真空助力器、真空增压器等伺服机构,以达到改善制动性能和降低劳动强度的目的。但是,若对这部分了解不够,一旦出现故障,不仅会使制动可靠性下降,还会因查找故障不当,造成人力和物力的浪费。     

皇冠系列轿车制动系统的检查与调整

皇冠系列轿车前轮为浮动钳盘式制动器,后轮多为鼓式制动器.制动总泵为双管路串联式,带有真空加力器.这是现代轿车普遍采用的制动结构型式.     

CPCD50型叉车制动力不足的判断与排除

CPCD50型叉车脚制动系统为油压蹄片式前轮制动,踏下制动踏板,制动总泵输出低压制动液,一路进入变速器操纵阀,切断通向离合器的压力油路;另一路进入真空增压器,增压后进入车轮制动器中的制动分泵,涨开制动蹄片实现车轮制动。若制动力不足,可能是机械部分、或油路系统或真空增压系统有故障。     

电动汽车真空助力制动系统的匹配计算与研究

以某微型汽车为例,建立了其真空助力制动系统的数学模型,对燃油汽车改装为电动汽车后的制动系统真空助力匹配进行了计算分析,从而为电动汽车真空助力系统中真空罐、真空助力器、真空泵的选型和匹配提供了理论依据.通过试验验证可知,本文的真空罐及真空泵阀值选择合理,电动真空泵工作时间为4～6 s.     

电动汽车真空助力制动系统仿真研究

对电动汽车真空助力系统进行建模仿真,分析了踏板行程与真空度消耗关系、不同真空度条件下助力器的输出性能关系、真空泵响应是否满足助力器等问题,仿真结果显示,助力器输出力与踏板输入力相协调,符合制动要求。真空泵抽速、启停真空度、罐体大小与真空助力器的需求搭配合理。制动主缸液压压力满足制动强度需求。在连续制动时,真空罐内真空度变化规律性好,每次制动前真空罐真空度环境一致。     

Development of an electric booster system using sliding mode control for improved braking performance

Brake systems of the future, including BBW (Brake-by-Wire), are in development in various forms. In one of the proposed hydraulic BBW systems, an electric booster system replaces the pneumatic brake booster with an electric motor and a rotational-to-linear motion mechanism. This system is able to provide improved braking performance by the design of controllers with precise target pressure tracking and control robustness for better system reliability. First, a sliding mode controller is designed using the Lyapunov function approach to secure the robustness of the system against both the model uncertainty and the disturbance caused by the master cylinder and mechanical components. Next, a simulation tool is constructed to validate the electric booster system with the proposed controller. Finally, the electric booster system is implemented into an actual brake ECU and installed in a vehicle for testing under various braking conditions. The experimental results demonstrate that the proposed controller produces faster pressure build-up performance than the conventional brake system, and its tracking performance is sufficient to ensure comfortable braking.     

新型汽车液压增力制动控制器

为了提高汽车制动效率开发一种汽车液压增力制动控制器（HBI）.它主要由增压缸等组成,串联于汽车制动主缸与前制动轮缸之间,将制动主缸输出压力制动液增压,送往前制动轮缸.同时还将压力制动液直接送往后制动轮缸,实现汽车增压制动,其制动效率高于现有减压分配阀组成的制动系统效率10%以上.对具有HBI系统的制动性能检测表明,HBI可用于多种车型的制动系统中,制动踏板力明显下降100 N左右,制动稳定性明显提高.     

Development of a semi-empirical program for predicting the braking performance of a passenger vehicle

Since the invention of automobiles, the need to know the braking performance of vehicles has been acknowledged. However, because there are numerous design variables as well as nonlinearities in the braking system, it is difficult to predict the performance accurately. In this paper, a computational program is developed to estimate the braking performance numerically. This synthetic braking performance program accounts for pedal force, pedal travel and deceleration of braking parts, such as master cylinder, booster, valve, brake pad, rotor, and hoses. To improve the accuracy of program, a semi-empirical model of a braking system is introduced by using the empirical test data of pad compression, hose expansion and the friction coefficient between the pad and rotor. The accuracy of the estimation is evaluated by comparing it to the actual vehicle test results. The developed program is easy for the brake system engineers to manipulate and it can be used in the development of new vehicles by incorporating the graphical presentations.     

汽车集成式电子真空助力器系统设计

为满足汽车驾驶辅助系统对于辅助制动装置越来越高的要求,提出了一种基于汽车普通制动真空助力器的集成式电子真空助力器系统(Electronic Vacuum Booster,EVB)。在对系统整体结构进行设计的基础上,基于电磁铁数学模型对EVB关键零部件电磁铁参数进行了优化设计。为实现基于EVB的驾驶辅助系统控制器设计,对包括控制器和执行器在内的EVB整体系统模型进行了辨识。试验结果表明:所开发的EVB系统能快速、精确地响应制动指令,可广泛应用于自适应巡航控制系统、走-停巡航系统及主动避撞系统等驾驶辅助系统。     

真空助力器-制动主缸总成综合性能测试系统的研制

提出了汽车真空助力器—制动主缸总成的综合性能测试项目,采用机电气液一体化的原理方法,研制出了总成综合性能测试系统,详细论述了测试系统各组成部分。大量测试试验证明该系统测试方法合理、功能齐全、自动化程度高、测试结果准确可靠。     

提高制动主缸寿命的设计改进

文章从设计角度阐述了提高制动主缸寿命的方法。改进方法主要有缸体阳极氧化处理、补偿孔反冲工艺、活塞结构设计、活塞倒角改圆设计、皮碗圆角设计5个方面，通过对缸体、活塞、皮碗的结构和工艺加工方法等细节方面的改进，提高了整个制动主缸的耐久性，并通过试验数据证明了改进的效果。改进后的主缸耐久性得到了全面提高，使制动主缸的寿命延长，同时提高了整车的使用性能。     

Design and validation of an electro-hydraulic brake system using hardware-in-the-loop real-time simulation

This paper presents a novel electric booster (E-booster) that exibits superior performance advantages over traditional vacuum boosters. The proposed E-booster, consisting of an electric motor and a ball screw assembly, is designed for electro-hydraulic brake (EHB) systems to meet relevant requirements for electric vehicles and active safety technologies. A mathematical model for an EHB system is generated to determine the desired values of the parameters for the E-booster prototype using numerical simulation in MATLAB. Simulation results of the EHB system with the virtual E-booster demonstrate the feasibility and effectiveness of the innovative technique. Built upon the results derived from the numerical simualtions, an integrated algorithm based on the Kalman filter and a sliding mode control technique is designed to control the E-booster motor and to implement the brake booster function. A hardware-in-the-loop (HIL) real-time simulation system equipped with the E-booster prototype is developed. HIL real-time simulations are conducted to evaluate the proposed algorithm. The HIL real-time simulation results demonstrate that the proposed algorithm generates booster brake forces fast, and forces the ball nut to track the push rod well to ensure comfortable brake pedal feel.     

Development of the brake system design program for a vehicle

It is quite challenging to estimate the braking performance of a vehicle because the brake system is comprised of many parts, including a booster, master cylinder, and caliper. Calculation of characteristics such as braking force through vehicle tests requires much time and money. Therefore, the development of a method to estimate the braking performance of a vehicle using qualitative methods is beneficial. In this study, a program that can analyze the braking capabilities of a vehicle such as pressure, efficiency, and pedal travel is presented. The increase in disc temperature during braking as well as the properties of various boosters can be calculated using the proposed program. Dynamic characteristics of a vehicle equipped with a Load Sensing Proportional Valve (LSPV) were computed more precisely by obtaining the change in valve pressure according to the displacement of a suspension system. Since all input and output files are composed in the Microsoft Excel format, both design data management and database construction can easily completed.