摘要
VFS阀作为自动变速器控制离合器接合的重要器件,通过脉宽调制(PWM)信号控制。低频率的PWM信号会产生占空比和频率不能独立调节的寄生颤振,为此常在高频率的PWM信号中叠加独立颤振,通过改变PWM信号占空比的方法改变电流,提高VFS阀的响应特性。运用AMESim软件建立VFS阀叠加颤振模型,证明了其正确性,并得出该VFS阀叠加颤振频率为100 Hz左右响应最快的结论。
VFS valve,as an important device of automatic transmission to control clutch engagement,is controlled by a pulse width modulation(PWM)signal.Low-frequency PWM signals will produce parasitic dithering whose duty cycle and frequency can’t be adjusted independently,therefore,independent dither is usually superimposed in the high-frequency PWM signal,and the current is changed by changing the duty cycle of the PWM signal to increase the VFS valve response characteristics.In this paper,the AMESim software is used to establish the VFS valve superimposed dither model.It is concluded that to improve the response characteristics of the VFS valve,the peakto-peak and frequency of the superimposed dither current must be around 100 Hz.
作者
张志刚
杨宇坤
刘元杰
李腾
王凌峰
ZHANG Zhigang;YANG Yukun;LIU Yuanjie;LI Teng;WANG Lingeng(College of Vehicle Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Tsingshan Industrial,Chongqing 402761,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2020年第8期9-14,共6页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目(51205432)
重庆市基础科学与前沿技术研究专项资助项目(cstc2017jcyj AX0143)
重庆巴南区科技合作项目(2017TJ11)。
关键词
脉宽调制
寄生颤振
叠加颤振
响应特性
pulse width modulation(PWM)
parasitic dither
independent dither
response characteristics
