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Regenerative braking was the process of converting the kinetic energy and potential energy, which were stored in the vehicle body when vehicle braked or went downhill, into electrical energy and storing it into battery. The problem on how to distribute braking forces of front wheel and rear wheel for electric vehicles with four-wheel drive was more complex than that for electric vehicles with front-wheel drive or rear-wheel drive. In this work, the frictional braking forces distribution curve of front wheel and rear wheel is determined by optimizing the braking force distribution curve of hydraulic proportional-adjustable valve, and then the safety brake range is obtained correspondingly. A new braking force distribution strategy based on regenerative braking strength continuity is proposed to solve the braking force distribution problem for electric vehicles with four-wheel drive. Highway fuel economy test (HWFET) driving condition is used to provide the speed signals, the braking force equations of front wheel and rear wheel are expressed with linear equations. The feasibility, effectiveness, and practicality of the new braking force distribution strategy based on regenerative braking strength continuity are verified by regenerative braking strength simulation curve and braking force distribution simulation curves of front wheel and rear wheel. The proposed strategy is simple in structure, easy to be implemented and worthy being spread. 相似文献
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汽车直接横摆力矩控制(direct yaw moment control,DYC)系统用于有效避免车辆遇到非预计危险时的侧向运动,以保证汽车运行的稳定性和驾驶的安全性。目前,DYC系统大多采用分层结构。文章首先从车辆状态估计与环境感知、直接横摆力矩控制器设计和力矩分配法这3个角度分析了汽车DYC系统架构,接着重点阐述了其对车速、车间距离、路面信息、横摆角速率以及车辆质心侧偏角等状态信息的获取与处理方法;然后介绍了上层控制器中车辆动力学参考模型、控制结构及不同变量控制的设计方法以及下层控制器中车辆横摆力矩的分配方式;最后总结了汽车直接横摆力矩控制系统现存的问题以及将来发展的方向。 相似文献
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针对典型的一阶生产过程,采用广义预测控制算法,完成了基于S7—200PLC的单步广义预测控制器的设计,并以JWS-6/3—4型过程控制装置为对象,以液位为被控变量,实现了单步预测控制。实验表明系统控制精度高,取得了实际误差小于5mm的控制效果,运行稳定,具有一定的实用性和推广性。 相似文献
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