The Design of Valve Overlap Angle controlled by Electromagnetic drive

• Main Authors: Tzeng Jia-hsing, 曾嘉興
• Other Authors: Chen Wen-ruei
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/88246256075133746712

碩士 === 遠東技術學院 === 機械研究所 === 92 === This article roughly analyzes the representation of variable valve timing on the market. It focused on the change of valve overlap angles that uses electromagnetic drive method to draw the ideal variable valve timing graph. From the work principles of electromagnetic valve, the control valve system must open and close the valve precisely. Then the results of the experiment could be applied on the engines. The use of electromagnetic valve timing is to replace the camshaft and valve rocker arms of 4-stroke engine, and minimize the mechanical resistance and noise. Besides, to use the electromagnetic to drive the valve directly, this can change the timing and duration of the valve freely. In fact, it makes the idea of continuous variable valve timing possible. This design concept focuses on how to make electromagnetic coils turn on and turn off accurately and timely. Through a 4-axis quadrature encoder and counter card collect signals, and then program executes to distinguish the output control. Therefore, it enables the switch speed of driving electromagnetic valve to reach the same speed of traditional diving camshaft.