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|Title:||Frequency response enhancement of variable valve system by employing peak and hold method|
|Keywords:||Peak and hold method;Frequency response;Variable valve system;Proportional pressure reducing valve|
|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.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.17(4) [August 2010]|
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