共查询到18条相似文献,搜索用时 265 毫秒
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楔形制动器的开发与应用 总被引:1,自引:0,他引:1
本文介绍了楔形制动器的特点、结构、特征参数和制动力矩计算方法以及制动底板有限元分析结果,指出了结构因素对制动力矩输出的影响,给出了典型的试验结果和结论。 相似文献
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设计了一种汽车轮内叶轮式磁流变液制动器,推导出该制动器的制动力矩计算方法,并在Matlab/Simulink环境下建立仿真模型,分析了制动器结构参数对制动力矩的影响。结果表明,叶轮式磁流变液制动器工作模式为剪切与流动的混合模式,其制动力矩与磁感应强度呈现对数变化规律,与工作间隙呈现负指数变化规律;叶片的径向尺寸、叶片数量和叶片厚度对制动力矩都有较大影响。所设计的汽车磁流变液制动器能够满足一般小型汽车的制动力矩需求。 相似文献
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介绍了EQ1016轻型汽车车轮制动器制动力矩设计设计指标的确定,并对汽车车轮制动器制动力矩设计指标的确定方法进行了讨论与完善。 相似文献
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汽车制动器制动效能因数计算及结果分析 总被引:3,自引:0,他引:3
对47种型号的汽车液压制动系统制动器的制动效能因数进行了计算,得到了当摩擦因数为0.35时各种结构型式制动器制动效能因数的平均值及其分布范围。绘制了国产各种结构型式制动器典型的制动效能因数随摩擦衬片摩擦因数变化的特性曲线。对同一制动器采用两种不同的制动效能因数计算方法所得计算结果进行了对比及验证。根据制动效能因数曲线图,提出了制动器系列化设置时减少制动器尺寸规格的设想。 相似文献
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针对磁流变制动器制动力矩输出不稳定的问题,采用遗传算法优化后的模糊PID控制器对双线圈磁流变制动器进行力矩控制。基于Bingham模型建立了双线圈磁流变制动器的制动力矩数学模型,同时推导了磁流变制动器的动态模型。完成了双线圈磁流变制动器的制动力矩实验,当励磁电流为1.0 A时,磁流变制动器制动力矩最大值为4.8 N·m;采用最小二乘结构模型,开展了双线圈磁流变制动器传递函数的参数辨识;基于遗传算法和模糊PID控制,设计了双线圈磁流变制动器的遗传算法优化的模糊PID控制器;搭建了磁流变制动器控制实验平台,开展了磁流变制动器力矩控制实验研究。研究结果表明,相比于传统模糊PID控制,在基于遗传算法优化的模糊PID控制下,双线圈磁流变制动器能实现较好的力矩控制效果,制动力矩阶跃响应上升时间为0.63 s,超调量为4.17%,制动力矩跟踪误差在0.2 N·m以内,具有较快的响应速度、较小的超调量以及较小的力矩跟踪误差。 相似文献
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A cooperative control algorithm for an in-wheel motor and an electric booster brake is proposed to improve the stability of an in-wheel electric vehicle. The in-wheel system was modeled by dividing it into motor and mechanical parts, and the electric booster brake was modeled through tests. In addition, the response characteristics of the in-wheel system and the electric booster brake were compared through a frequency response analysis. In the cooperative control, the road friction coefficient was estimated using the wheel speed, motor torque, and braking torque of each wheel, and the torque limit of the wheel to the road was determined using the estimated road friction coefficient. Based on the estimated road friction coefficient and torque limit, a cooperative algorithm to control the motor and the electric booster brake was proposed to improve the stability of the in-wheel electric vehicle. The performance of the proposed cooperative control algorithm was evaluated through a hardware-in-the-loop simulation (HILS). Furthermore, to verify the performance of the proposed cooperative control algorithm, a test environment was constructed for the anti-lock braking system (ABS) hydraulic module hardware, and the performance of the cooperative control algorithm was compared with that of the ABS by means of a HILS test. 相似文献
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X. Ran X. Zhao J. Chen C. Yang C. Yang 《International Journal of Automotive Technology》2016,17(5):817-827
A Traction Control System (TCS) is used to avoid excessive wheel-slip via adjusting active brake pressure and engine torque when vehicle starts fiercely. The split friction and slope of the road are complicated conditions for TCS. Once operated under these conditions, the traction control performance of the vehicle might be deteriorated and the vehicle might lack drive capability or lose lateral stability, if the regulated active brake pressure and engine torque can’t match up promptly and effectively. In order to solve this problem, a novel coordinated algorithm for TCS is brought forward. Firstly, two brake controllers, including a basic controller based on the friction difference between the two drive wheels for compensating this difference and a fuzzy logic controller for assisting the engine torque controller to adjust wheel-slip, are presented for brake control together. And then two engine torque controllers, containing a basic PID controller for wheel-slip control and a fuzzy logic controller for compensating torque needed by the road slope, are built for engine torque control together. Due to the simultaneous and accurate coordination of the two regulated variables the controlled vehicle can start smoothly. The vehicle test and simulation results on various road conditions have testified that the proposed method is effective and robust. 相似文献
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本文分析了制动器台试减速度允差评定方法,为了有效制动和改善轿车制动稳定性,讨论了摩擦材料的摩擦系数与制动减速度和前后制动分配比的关系,根据设计要求之制动减速度和制动力分配比,提供摩擦系数计算方法和顺序,用于合理确定台试时的摩擦系数允差,本文可供制动器设计和摩擦材料选用作参考。 相似文献
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介绍气制动大客车制动力以及制动力矩的计算方式,并通过实际气制动客车制动力矩的计算和数据对比.为今后在客车制动系统设计当中,提供有效理论依据. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1473-1494
Vehicle traction control system has been developed to enhance the traction capability and the direction stability of the driving wheels through the tyre slip ratio regulation. Under normal situations, if the tyre slip ratio exceeds a certain threshold, the slip ratio of the driving wheel is regulated by the coupled interaction of the engine torque and the active brake pressure. In order to obtain the best driving performance on a road under complicated friction conditions, the driving torque and the active brake pressure, need to be decoupled and adjusted to avoid penalisation of each other. In this paper, a coordinated cascade control method with two sliding-mode variable structure controllers is presented. In this control method, the driving wheel slip ratio is regulated by adjusting the engine torque and the wheel brake pressure. Through the sliding-mode controller, the engine torque is tuned to achieve the maximum driving acceleration and then the active brake pressure is applied to the slipped wheel for further modification of the wheel slip ratio. The advantage of this control method is that through proper regulation, the conflict between the two control inputs could be avoided. Finally, the simulation results validate the effectiveness of the proposed method. 相似文献
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本文研究了制动衬片摩擦性能——热衰退性能、速度和压力相关性对轻型货车鼓式制动器前后制动力之比的影响及其规律。研究表明,前后制动力之比不足一固定值,而是在很大范围内变化的一个区,从而影响同步附着系数,导致前后轮抱死区的变动;研究表明,摩擦特性受热不稳定而出现的逆衰退和过恢复是影响β的主要原因。本文还讨论了前后制动力之比β的简易计算法与台试实测结果间的差异,提出由制动器台架试验确定β之方法。 相似文献
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S. -H. Kim E. -J. Han S. -W. Kang S. -S. Cho 《International Journal of Automotive Technology》2008,9(2):233-247
This paper investigates the brake corner system to reduce brake torque variation in the brake judder problem. A numerical
model for determining brake torque variation was constructed using the multi-body dynamics model. Using this model, the brake
torque variation for a given disc thickness variation was obtained in the time domain. The multi-body dynamics model was verified
by a dynamometer test via the comparison of brake torque variation and load distribution patterns of the pad. To reduce the
simulation time and cost required to determine factors that influence the reduction in brake torque variation, a simple mathematical
model was constructed and used to determine both the brake torque variation and influential factors. The multi-body dynamics
model and dynamometer test were modified on the basis of the results of the simple mathematical model and deformed shape of
the multi-body dynamics model. These influential factors were verified to reduce the brake torque variation. 相似文献