DIESEL ENGINE HAVING CAM FOR CONTROLLING INTAKE VALVE WHICH HAS MAIN LOBE AND ADDITIONAL LOBE CONNECTED TO EACH OTHER IN THE SAME DIAMETER

摘要

PROBLEM TO BE SOLVED: To provide an engine in which times for opening and closing of an intake valve and an opening stroke can be varied as desired. SOLUTION: A supercharged diesel engine includes an electronically controlled hydraulic system for variable actuation of the intake valves of the engine. The cam 9 that controls each intake valve has an additional lobe 41 for causing an additional opening of the intake valve, during the expansion and exhaust strokes, so as to provide an exhaust-gas recirculation directly inside the engine. The additional lobe 41 has its descending stretch connected to the main lobe 40 in a same radius with a stretch corresponding to a non-zero lift of the valve in such a way that the profile of the lift of the valve has a portion corresponding to a substantially non-zero value of the lift that connects the descending stretch of the profile of the additional lift to the ascending stretch of the profile of the main lift in a same radius. COPYRIGHT: (C)2010,JPO&INPIT