METHOD OF DRIVINGLY CONTROLLING VALVE OF ENGINE WITH TURBOCHARGER

摘要

A method of drivingly controlling valves of an engine with a turbocharger capable of securely preventing surging from occurring even if the engine with the turbocharger is operated by a cylinder-reduction operation in a low speed range. The engine with the turbocharger comprises a variable valve mechanism (18) capable of adjusting the opening/closing timings and lifts of the intake and exhaust valves (only the exhaust valve (17) is shown in the figure) of each of cylinders (8). The valve opening operation of the intake and exhaust valves in a part of the cylinders (8) is disabled by the variable valve mechanism (18), and the cylinder-reduction operation is performed by only the remaining cylinders (8). The exhaust valve (17) is opened when an intake pressure is higher than an exhaust pressure in a suction stroke under the cylinder-reduction operation in the low speed range to increase the blowout amount of fresh air (intake air (4)) to the exhaust side so as to increase an apparent exhaust flow. Thus, sucking characteristics on the engine side can be improved.