共查询到18条相似文献,搜索用时 205 毫秒
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离合器控制是AMT系统控制的核心关键,实现对离合器位置的精确控制是保证离合器寿命、提高AMT换挡舒适性的重要因素,而气动离合器由于气体本身的可压缩特性,导致离合器位置控制具有非线性、滞后性和超调现象,单纯依靠PID控制无法解决位置超调问题。故本文提出一种预测性气动AMT离合器位置精确控制方法,通过扭矩控制确定离合器目标位置,基于离合器目标位置,以离合器实际位置为反馈信号通过PID控制器实现离合器位置闭环控制,对离合器目标位置和实际位置相互关系、位置变化率等参数信息进行识别,寻找恰当时机提前开启离合器相应电磁阀实现预测性控制,从而减小气动离合器超调现象,提高换挡舒适性。 相似文献
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自行设计了金属带式无级变速器的电流控制系统,并在变速器试验台上进行了试验研究,同时对试验结果进行了分析,结果结果表明,在变速过程中采用调节脉宽调制电磁阀的占空比来控制湿式多离合器的结合过程,工作过程和分离过程是行的,所设计的控制系统和所采用的控制方法能够保证速比控制和夹紧力控制满足实际要求,为进一步在汽车上进行无级变速器试验奠定了基础。 相似文献
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正时电磁阀(ST)用于控制前进档离合器C1油液的供给与排放,以缓解从3档换入4档时的冲击,正时电磁阀由变矩器直接驱动。正时电磁阀同时控制前进档离合器C1的工作压力,以与最佳工况相匹配。出于安全考虑,当车速超过9km/h时,防止倒档齿轮啮合。正时电磁阀位于阀体上,位置见图18。 相似文献
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为了改善大功率自动变速器换挡过程中换挡离合器(含湿式制动器和湿式离合器)油压的调控水平,提高车辆的换挡品质,从结构上在换挡离合器中设计平衡活塞来补偿离合器旋转离心的影响,并在排油回路中增加背压阀以消除活塞腔内空气造成的不确定性。通过对换挡执行系统结构进行分析,分别针对离合器活塞、电液调压过程及离合器滑摩过程进行模型计算,在此基础上,将惯性相的充油调压控制进行拆解,即在转矩相结束时刻初始常量的基础上叠加一阶控制过程,针对换挡过程中系统存在非线性干扰和参数不确定性的特点,结合系统特性的分阶段试验标定,制定了换挡离合器调压过程的滑模控制策略,并基于MATLAB环境对控制策略的正确性和有效性进行仿真分析,最后进行实车试验验证。研究结果表明:无论是制动器充油还是旋转离合器充油,控制策略均能将惯性相持续时间、换挡冲击和滑摩功率损失等控制在合理范围;控制策略具有良好的性能,旋转离合器和制动器都能实现稳健的惯性相调压控制。 相似文献
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介绍了高速开关阀的特点及在沥青混凝土摊铺机自动找平控制系统中的应用,设计了一套高速开关阀控制方案,并在实验室建立了实验台,通过实验对传统普通电磁阀控制方案和高速开关阀控制方案进行了比较,得到了比较详细的实验数据。实验结果表明,高速开关阀可以较好地应用到自动找平控制系统中,对提高系统响应时间、减小开关控制死区的影响有较好的作用,但过高的调制频率对系统的影响并没有太大好处。 相似文献
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Hirohisa Tanaka Professor Hideyuki Wada Researcher 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1995,24(4):365-376
This paper presents a fuzzy control system for the clutch engagement of an automated manual transmission. The servomechanism is assembled with a three-port pneumatic pressure-proportional valve and a position-sensing cylinder which control the release-lever displacement of 25 mm within the position preciseness of 0.1 mm against maximum spring load of 2kN. The fuzzy system is skillful to estimate the driver's will from the accelerator pedal operation. The servomechanism is mounted on a commercial vehicle with 4-ton pay-load. The system parameters are set up by bond graphs simulation and empirical performance tests are carried by using an oil-hydraulically operated engine-vehicle testing rig with a maximum torque capacity of 400 Nm. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4-5):365-376
SUMMARY This paper presents a fuzzy control system for the clutch engagement of an automated manual transmission. The servomechanism is assembled with a three-port pneumatic pressure-proportional valve and a position-sensing cylinder which control the release-lever displacement of 25 mm within the position preciseness of 0.1 mm against maximum spring load of 2kN. The fuzzy system is skillful to estimate the driver's will from the accelerator pedal operation. The servomechanism is mounted on a commercial vehicle with 4-ton pay-load. The system parameters are set up by bond graphs simulation and empirical performance tests are carried by using an oil-hydraulically operated engine-vehicle testing rig with a maximum torque capacity of 400 Nm. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(6):776-801
As for the self-developed six-speed dry dual-clutch transmission (DCT), the optimal torque-coordinated control strategy between engine and dual clutches is proposed to resolve the problem of launching with twin clutches simultaneously involved based on the minimum value principle. Focusing on the sliding friction phase of the launching process, dynamics equations of dry DCT with two intermediate shafts are firstly established, and then the optimal transmitting torque variation rate and the driven plate's rotating speed of dual clutches are deduced by using the minimum value principle, in which the jerk intensity and friction work are taken as the performance indexes, and the terminal constraints of state variables are determined according to the driver's launching intention. Besides, the separating conditions of non-target gear clutch and the torque distributing relations of twin clutches are derived from the launching control targets that guarantee the approximately equal friction extent of two clutches and no power cycle. After the synchronisation of driving and driven plates of on-coming clutch, the output torque of engine is smoothly switched to the driver's demand level. Furthermore, launching the simulation model of the dry DCT vehicle is set up on the Matlab/Simulink platform. Simulation results indicate that the proposed launching control strategy not only can effectively reflect the driver's intention and extend the life span of twin clutches, but also obtain an excellent launching quality. Finally, the torque control laws of two clutches obtained through the simulation are transformed into clutch position control laws for the future realisation in the real car, and the closed-loop position controls of twin clutches in the launching process are conducted on the test bench with two sets of clutch actuator, obtaining preferable tracking effects. 相似文献
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