Patent ID: 6637385
Filing Date: 2003-10-28
Classification: F01L,F01N,F02B,F02D,Y02T

Abstract:
An exhaust control device for an internal combustion engine comprising:a piston operable to perform reciprocating motion between top dead center and bottom dead center inside a cylinder bore; an intake valve and an exhaust valve operable to open and close a combustion chamber positioned at the top of said cylinder bore; an electromagnetic driving mechanism operable to drive opening and closing of at least said exhaust valve by electromagnetic force; an exhaust passage operable to conduct exhaust gases from said combustion chamber and discharged by opening said exhaust valve; a bypass exhaust passage communicating between said cylinder bore and said exhaust passage and disposed in the region of bottom dead center of said piston in said cylinder bore; and a control part operable to control said electromagnetic driving mechanism such that when said piston moves to the region of bottom dead center to begin an exhaust stroke, exhaust gases are exhausted through said bypass exhaust passage before said exhaust valve is opened.