共查询到18条相似文献,搜索用时 140 毫秒
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在分析永磁无刷直流电机(BLDCM)数学模型的基础上,建立了相应的仿真模型。设计了用于BLDCM转速控制的神经PID控制器。通过仿真计算,验证了神经PID响应快、跟随性好、鲁棒性强的特点,能够满足干式双离合器式自动变速器中对离合器作动控制系统的要求。 相似文献
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电子控制系统一直是电控自动变速器区别于全液压式自动变速器的关键部件,但电控自动变速器与液控自动变速器的液压控制系统也有很大的不同。本文从构造及原理上对二者在液压控制系统上的不同做了详细的分析阐述。 相似文献
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基于32位微控制器MPC5604开发了双离合器自动变速器(DCT)控制系统。设计了换挡规律,制定了换挡控制策略、起步和换挡过程离合器及同步器执行机构的动作时序。根据DCT的结构特点及功能要求,实现了多任务控制系统,提出了基于表驱动的多任务调度方法。基于xPC560B硬件系统测试平台对所设计DCT控制系统功能进行了验证。结果表明,所开发的控制系统工作可靠,实现了起步、换挡过程的目标控制功能。 相似文献
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对湿式双离合器式自动变速器(DCT)液压系统进行深入分析,在其基础上建立了离合器管道动态模型,研究其时、频域特性,分析了油腔容积、蓄能器对离合器油腔油道特性的影响;建立了油道充油数学模型,分析油道直径、容强体积参数变化时对充油特性的影响,指出了提高离合器油道特性性能的措施和途径;建立了离合器油压电液比例压力控制阀模型,得到了不同PWM占空比、电流-离合器油腔压力以及占空比-充油时间的变化关系,分析了蓄能器对油腔压力滤波的作用效果,最后进行了PID压力跟踪控制仿真,给出了压力、油液流量以及比例阀阀芯位移变化曲线。分析结果不论对于液压系统的设计还是电控系统(TCU)的设计都有非常重要的参考和指导意义。 相似文献
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双离合器自动变速器的发展及展望 总被引:1,自引:0,他引:1
介绍了双离合器自动变速器的发展概况,通过对其结构、原理以及控制系统的分析,得出双离合器自动变速器是最有发展前景的,同时也是最适合中国国情的自动变速器. 相似文献
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双离合器自动变速器(Dual Clutch Transmission,DCT)随着服役时间的增加离合器性态会发生变化导致起步性能下降,为降低离合器性态变化对起步性能的影响,提出一种基于扩展状态观测器和滑模控制的DCT起步自适应控制方法。首先,建立DCT起步动力学模型、发动机模型和液压控制系统模型;将DCT起步问题转化为参考轨迹跟踪问题,通过工况识别并利用极小值原理获得了不同起步工况的参考轨迹;在DCT起步动力学模型中将与离合器性态变化相关的项定义为不确定项,设计扩展状态观测器对不确定项进行估计,同时结合自适应滑模控制器,获得了起步发动机转矩和离合器油压的自适应控制率;为了跟踪发动机转矩和离合器油压的自适应控制率,设计了发动机转矩跟踪控制器,同时对液压系统采用了PID闭环控制;通过MATLAB/Simulink平台仿真以及台架试验验证所提出的DCT起步控制方法对离合器性态变化的自适应效果。研究结果表明:所提出的起步自适应控制方法能够有效避免由离合器性态变化导致的起步延时,同时1挡缓起步和急起步的仿真冲击分别减小了53.11%和43.42%,试验起步冲击分别减小了35.66%和30.31%。 相似文献
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Most hybrid vehicles employ the continuously variable transmission (CVT or eCVT) currently as their choice of the transmissions. Recently, an automated geared transmission (AGT) or dual clutch transmission (DCT) is being tried for some hybrid vehicles for the better fuel economy than the CVT hybrid. However, this AGT or DCT is using automated clutches which require the hydraulic power in addition to the slippage in the clutch plate invoking some energy loss as well as wear. Also, they require a motor with significant power to match to the engine power. The clutchless geared smart transmission (CGST) has no clutch and the clutch function is performed by a planetary gear system controlled by a motor-generator. The hybrid vehicles proposed here using CGST may have some merits in durability, fuel efficiency, and cost since they do not have clutches. The motor used for the clutch function can be also working for power merge with the engine in propelling the vehicle. The proposed hybrid system can be either mild hybrid or full hybrid by adopting a different capacity of battery with much smaller motor-generator due to the planetary gear system compared to the other type hybrid vehicles. In this study, the prospects of newly proposed CGST hybrid system are examined in practical aspects compared with AGT hybrid or DCT hybrid systems. 相似文献
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W. Guo S. H. Wang C. G. Su W. Y. Li X. Y. Xu L. Y. Cui 《International Journal of Automotive Technology》2014,15(4):683-698
The shift comfort and efficiency of Automatic Transmission in vehicle are highly influenced by the pressure of the clutch shift control system, especially by the electro-hydraulic clutch subsystem. In this paper, the new design principles of electro-hydraulic clutch systems developed and modeled in detail, the clutch-to-clutch control system is analyzed in three time intervals: oil filled phase, changing phase of clutch torque and synchronous phase of clutch speed. The demand pressures for the engaged clutches calculated in each phase and is precisely built up by using fuzzy slide mode control, the time of hydraulic pressure building-up is very sensitive to the dither current in simulation. All control parameters are optimized by Cosimulation between software Simulink and SimulationX. Finally, the optimal algorithm of the clutch shift control is written into the transmission control unit of a testing vehicle. The testing results show that the suggested control strategy is effective. 相似文献