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Based on multidisciplinary design optimization (MDO), a new design method is put forward for hydraulic shift mechanism of heavy-duty vehicle automated manual transmission (AMT). Taking a shift cylinder for example, the collaborative optimization (CO) method for the design problem of a cylinder is devided into one system level design optimization problem and three subsystem level design optimization problems. The system level is an economic model and the subsystem level is mechanics, kinetics, and a reliability model. Application of the multidisciplinary design optimization software iSIGHT modeling and solving, optimal solution of the shifting cylinder CO model is obtained. According to the optimal solution, oil cylinders are machined out and installed on the gearbox of an AMT system for the bench cycle shift test. The results show that the output force and action speed of the optimized mechanism can meet requirements very well. In addition, the optimized mechanism has a better performance compared to the structure of the traditional design method, which indicates that the CO method can optimize the design of hydraulic transmission. 相似文献
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提出了基于信号冗余关系的自动变速操纵系统(ASCS)稳态行驶工况非平稳随机信号多重故障检测和诊断策略。通过分析ASCS非平稳信号特性以及信号之间的冗余关系,提出故障检测和诊断策略设计原则:不可信原则、多故障兼容原则和概率原则,作为故障检测和诊断策略设计的指导思想。同时根据故障诊断结果的准确性和有效性特点将故障诊断结果划分为一级、二级、三级3种类型。通过分析ASCS稳态工况的先验知识,提出非平稳随机信号故障检测和诊断策略,实现发动机转速、变速箱输入轴转速、车速和车辆挡位信号之间单或多重故障诊断的功能。向实车数据中注入不同类型故障来检测故障诊断策略的完整性和正确性,试验结果证实了该方法的有效性和实用性。 相似文献
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基于对重型越野车辆离合器工作特性及气助力液压操纵结构的分析,设计了一套离合器自动操纵系统。实现离合器的自动分离、接合和保持的功能需求。该系统同时保留离合器的手动应急操纵功能,从而保证重型越野车辆的战场生存能力。利用协同优化方法对该自动操纵机构的核心部件——操纵油缸进行设计。为获取所设计的自动离合器操纵系统的特性,设计台架试验,进行分离、接合、定点控制等试验。试验结果表明,该离合器自动操纵系统响应速度和控制精度均满足使用要求,为进行自动换挡系统中的离合器起步和换挡控制策略的研究奠定了良好的基础。 相似文献
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Slow driving control of tracked vehicles with automated mechanical transmission based on fuzzy logic
In order to move tracked vehicles at an extremely slow speed with automated mechanical transmission (AMT), slow driving function was added in the original system. The principle and requirement of slow driving function were analyzed. Based on analysis of slow driving characteristic, identification of slow driving condition and fuzzy control algorithm, a control strategy of the clutch was designed. In order to realize slow driving, the clutch was controlled in a slipping mode as manual driving. The vehicle speed was increased to a required speed and kept in a small range by engaging or disengaging the clutch to the approximate half engagement point. Based on the control strategy, a control software was designed and tested on a tracked vehicle with AMT. The test results show that the control of the clutch with the slow driving function was smoother than that with original system and the vehicle speed was slower and steadier. 相似文献
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