共查询到19条相似文献,搜索用时 74 毫秒
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通过液力缓速器和排气制动外特性曲线,借助simulink建立包括环境因素在内的缓速器和排气制动联合制动的恒速仿真模型,通过PID算法对恒速模型进行控制,仿真实验表明该恒速仿真模型可以有效的保证车辆恒速下坡功能并适应更为复杂的工况。 相似文献
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重型汽车发动机排气辅助制动效能的分析研究 总被引:2,自引:0,他引:2
汽车在山区丘岭地带公路上,尤其是夏季下坡行驶时,由于制动频次较高,行车制动器易热过载,影响汽车行驶安全性,因此,在重型汽车上大多装有无衰退性辅助制动装置。文章以典型车型为例,对重型汽车发动机排气辅助制动过程、特性、效能及其评价指标进行分析研究,提出合理使用排气制动以及改进其效能的技术措施。 相似文献
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从提高液力缓速器持续制动能力出发,通过试验测试整车在不同冷却系统中其持续制动性能,阐述了整车散热系统对液力缓速器持续制动能力的影响,提出了提高液力缓速器持续制动性能的方法。 相似文献
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主要行驶在矿山或山区公路上的汽车经常要下坡,为不使汽车在自身重力作用下不断加速到危险程度,应当对汽车进行持续制动,从而使汽车速度稳定在某个安全值. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2007,45(3):217-232
A robust control algorithm for an anti-lock brake system is proposed. The method used is based on static-state feedback of longitudinal slip and does not involve controller scheduling with changing vehicle speed or road adhesion coefficient estimation. An improvement involving scheduling of longitudinal slip reference with longitudinal acceleration measurement is included. Electromechanical braking actuators are used in simulations, and the algorithm used in this study is shown to have high performance on roads with constant and varying adhesion coefficients, displaying nice robustness properties against large vehicle speed and road adhesion coefficient variations. Guidelines are provided for tuning controller gains to cope with unknown actuator delay and measurement noise. 相似文献
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文章针对某重卡6×4自卸车出现辅助制动效果不良的现象,结合此车型对排气辅助制动器参数进行理论校核计算,发现按照理论参数进行匹配设计并不能有效地提高排气辅助制动性能:同时与市场上反映使用效果较好的同等竞品车型进行对比分析,找出导致该重型自卸车排气辅助制动效果不良的主要原因,并对该自卸车排气辅助制动系统进行优化;通过试验验证表明,改进后的辅助制动性能得到明显提升,并优于同等竞品车型。 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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液力缓速器对车辆制动时,车辆动能损失将由工作介质吸收,然后通过热交换器传递给整车散热系统。缓速器上的温度传感器实时反映缓速器热交换器出水口温度及工作腔油温,根据温度自动控制扭矩可防止温度过高对产品使用及整车运行产生影响。本文首先介绍了温度传感器在液力缓速器的重要性,然后对温度传感器的工作要求及使用环境进行了分析,最后进行了产品设计与试验验证。 相似文献
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基于制动轨迹检测的汽车路试模拟技术 总被引:1,自引:0,他引:1
为提高汽车制动性能检测结果的客观性,解决对同一辆汽车进行台试与路试的检测结果不一致的问题,提出路试模拟技术.该技术得以实现的关键是汽车制动轨迹的检测,具体方法是:在单个矩形测试平板的4个角,分别安装相同的压力传感器,以矩形平板的相邻边,建立平面坐标系,当车轮在平板上制动时,利用力矩平衡原理,求得车轮制动时的运动轨迹.将测试平板并排串联放置,组成路试模拟系统,可以对汽车各个车轮的制动轨迹同时进行检测.利用该方法可实现对汽车制动距离、横向位移、航向角等参数进行实时检测,从而模拟路试法进行汽车制动性能的评价. 相似文献