Tracking Control of Engine Valve
Date Issued
2007
Date
2007
Author(s)
Hung, Je-Bin
DOI
en-US
Abstract
The intake/exhaust valve is driven by the camshaft with constant angular velocity while the spark-ignition engine is in operation. Hence, the opening/closing timing of valves is unable to adjust according to engine speed. As a result, the engine has optimum efficiency only at certain engine speeds.
Variable valve timing system can change the timing of valve in compliance with the engine speed so that engine’s optimal efficiency can be maintained at all speed. Research shows that such a proved effective for improving engine performance and fuel economy.
In this thesis, we propose a new method to implement variable valve timing by positioning the angular position of camshaft. The camshaft then drives the valve to track designed trajectory. The method can eliminate the valve impact on its seating that occurs in electromagnetic engine valve. Moreover, it is able to reduce wear and acoustic noise.
Subjects
可變汽門正時
電子汽門
引擎
凸輪軸
variable valve timing
electromagnetic engine valve
spark-ignition engine
camshaft
Type
thesis