共查询到17条相似文献,搜索用时 187 毫秒
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发动机振动模糊半主动控制的研究 总被引:4,自引:0,他引:4
对发动机的主动隔振,提出了一种基于电流变技术的模糊半主动控制的研究。在介绍了模糊控制和电流变液特性的基础上,建立了发动机主动隔振的半主动控制模型,设计二输入单输出的模糊控制器,根据经验和理论分析制定模糊控制规则,运用MATLAB软件进行了被动控制与半主动控制的联合建模并仿真。仿真结果显示,与被动控制相比,模糊控制有很好的控制效果,使发动机的减振效果进一步提高。 相似文献
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汪少华姚勇陈龙施德华 《汽车工程学报》2016,(5):325-331
行星排式混合动力汽车具备发动机与路载解耦的特点,在控制时需引入PI算法调节发动机转速。对一种双行星排式混合动力系统进行研究,以提高车辆燃油经济性为目标,搭建了基于发动机最优工作曲线的控制策略。通过分析发动机转速,发现在传统PI控制下,发动机速度不能良好地跟随,存在波动现象,影响了整车燃油经济性。鉴于模糊算法的优良特性,将模糊控制与传统PI算法结合,实现PI参数在线修正。基于Cruise与Simulink平台进行了联合仿真,结果表明,采用模糊PI控制后,发动机转速跟随及时,有效消除了波动,电机MG1工作点也更为集中地分布在高效区域内,整车油耗在原有的节油表现基础上又有了2.83%的提升。 相似文献
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发动机怠速的模糊控制 总被引:1,自引:0,他引:1
通过对发动机怠速系统的分析,分析了影响怠速稳定性的各种因素。为了克服控制的各种问题,将模糊控制理论应用于发动机的怠速控制,并建立了系统的动态仿真模型。对系统进行了控制仿真的结果表明,模糊控制能够增强怠速的稳定性和提高系统的抗干扰能力。 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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TECHNICAL NOTE 总被引:16,自引:0,他引:16
F. Bakhtiari Nejad Associate Professor. S. Azadi 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1998,29(5):331-338
This paper presents an advanced control method in application of automotive systems. An adaptive fuzzy logic controller based on self tuning control methodology has been implemented and used to control the vehicle velocity. Fuzzy rules and reasoning are utilized on-line to determine the throttle angle, spark advance and braking force. Simulated results, as presented in this paper show the adaptive fuzzy control is well suited for vehicle speed control with a nonlinear dynamic behaviour of the engine. 相似文献
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基于转速感应的液压旋挖钻机功率匹配模糊控制 总被引:3,自引:0,他引:3
基于液压旋挖钻机负荷多变条件下的节能降耗要求,提出转速感应控制的负荷极限控制匹配方法。利用负荷变化引起的转速偏差的检测反馈,调节变量泵的排量,改变泵的吸收扭矩,控制发动机输出转速工作在能耗较低的转速范围,实现发动机与变量泵间的功率匹配;通过模糊自适应在线自整定调节PID参数,优化变量泵在不同工况下的变量调节性能,提高系统对负荷变化的适应性,实现发动机-变量泵系统的最佳效率匹配。经过在液压旋挖钻机平台上的试验论证,该方法达到了优化的目的,功率匹配效果显著。 相似文献
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Heeyun Lee Juyean Sung Hyeokjun Lee Chunhua Zheng Wonsik Lim Suk Won Cha 《International Journal of Automotive Technology》2018,19(4):687-694
In this study, a model-based integrated control method for engines and continuous variable transmissions (CVTs) is developed. CVT refers to a type of transmission which allows an engine to be operated independently with respect to the vehicle speed, with the engine torque and CVT gear ratio controlled in an integrated manner. In the proposed integrated control scheme, engine operating points which minimize the rate of instantaneous fuel consumption are calculated, and the engine target torque and target gear ratio are determined in an integrated manner based on the results of the calculations. Unlike the previous map-based control method, the method introduced in this study does not require an engine torque map or a CVT ratio map for tuning, and the engine torque and CVT ratio are controlled to minimize the amount of fuel used while satisfying the level of acceleration demand from the driver. The control scheme is based on the powertrain model, and the CVT response lag and transmission loss are also considered in the integrated control processes. The algorithm is simulated with various driving cycles, with the simulation results showing that the fuel economy performance of the vehicle system is improved with the newly suggested engine-CVT integrated control algorithm. 相似文献