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《Journal of Inner Mongolia University(Natural Science Edition)》 2015-03
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Study on the Control Frequency of Pulse Width Modulation Switch Solenoid for Automatic Transmission

LI Chun-fu;LI Yan-qin;Institute of Transportation,Inner Mongolia University;Communication Vocational Technology College of Inner Mongolia;  
The pulse width modulated switch solenoid is a kind of common shifting actuator for the automatic transmission.It's control signal is divided into low-frequency signal and high-frequency one,the low frequency signal is usually adopted when the pressure of clutch is controlled,and high frequency signal is usually adopted during oil pressure of clutch is holded.The method is given,which determines low frequency signal of oil pressure regulating process and high frequency signal of oil pressure holding process.The value of the pressure regulating frequency should be as high as possible,so as to obtain higher pressure regulating precision,but some factors must be considered,such as natural frequency of solenoid itself,the response time of opening and closing,the sampling rate of control system.For the holding signal frequency of solenoid,some factors also must be considered,such as current fluctuation,electromagnetic interference,magnetic loss,driving device charateristics and so on.Then the lowest possible duty be selected in order to obtain the ideal holding current and reponse speed for closing.
【Fund】: 国家“863”计划资助项目(2012AA111713);; 内蒙古自治区高等学校科学研究项目(NJZY12007)
【CateGory Index】: U463.2;U463.6
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