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IJEMS Vol.17(4) [August 2010] >

Title: Frequency response enhancement of variable valve system by employing peak and hold method
Authors: Yingjun, Xie
Zhen, Gao
Bo, Jin
Jinrong, Liu
Keywords: Peak and hold method
Frequency response
Variable valve system
Proportional pressure reducing valve
Issue Date: Aug-2010
Publisher: CSIR
Abstract: A control method based on peak and hold technique is applied to variable valve system to prompt its response rate. The proposed method is characterized by a significantly higher response rate compared with the standard control method. Different from the standard control method, which provides the coil with a constant voltage proportional to the target lift, the control system based on PH method provides the coil with higher voltage during the rising stage of the valve to prompt its response rate. The mathematical model of the system is derived to establish the transfer function of the system. The optimal duration of peak voltage is obtained by simulink models. The experimental results indicate that much higher frequency response can be guaranteed by employing PH method. The maximal frequency that the system can achieve is 51 Hz, which is greatly enhanced from 25 Hz by employing the standard control method.
Page(s): 275-281
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.17(4) [August 2010]

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