Patent ID: 6234123
Filing Date: 2001-05-22
Classification: F02B,F02D,F02M,Y02T

Abstract:
A four-cycle internal combustion engine comprising:a combustion chamber;an igniter igniting a fuel-air mixture in said combustion chamber;a piston changing a capacity of said combustion chamber;an inlet valve opening/closing said combustion chamber;an exhaust valve opening/closing said combustion chamber;an adjustable valve mechanism switching valve timing of said inlet valve and switching that of said exhaust valve; anda controller controlling said igniter and said adjustable valve mechanism,wherein when a high load is put on said four-cycle internal combustion engine, said controller sets said valve timing of said exhaust valve in said adjustable valve mechanism so that said exhaust valve is closed around a top dead center of said piston, and ignites said fuel-air mixture around a compression top dead center of said piston by using said igniter,and wherein when a low load is put on said four-cycle internal combustion engine, said controller sets said valve timing of said exhaust valve in said adjustable valve mechanism so that valve closing timing of said exhaust valve advances before said top dead center of said piston as a load put on said four-cycle internal combustion engine becomes lower, and compression-ignites said fuel-air mixture without using said igniter.