Vibration-damping control apparatus and vibration-damping control method for internal combustion engine

Abstract

An apparatus and method of controlling vibration-damping for a vehicular internal combustion engine. The combustion is temporarily stopped in some cylinders among a plurality of cylinders, and the engine is operated by the remaining cylinders. Then, a variable valve mechanism which varies a valve lift amount of at least one of intake and exhaust valves of each cylinder is controlled, to decrease the valve lift amount of at least one of the intake and exhaust valves of each cylinder in which the combustion is temporarily stopped. Further, a rotating electric machine having at least one of functions of an electric motor and a generator is controlled, to apply torque to an output shaft of the engine thereby suppressing torque variation in the output shaft at the time when the combustion is temporarily stopped in some cylinders, so that the torque variation due to uneven explosion intervals is reduced.

Description

technical field [0001] The present invention relates to a technique for temporarily stopping combustion in a part of cylinders of an internal combustion engine for a vehicle in a state where the valve lift amount is low or in a state where the valve is closed, and for maintaining each cylinder whose combustion is temporarily stopped at least one of the intake and exhaust valves. Specifically, the present invention relates to a technique for reducing torque variation due to uneven knock intervals when combustion in a part of cylinders is temporarily stopped (hereinafter referred to as a period of temporary stop of a part of cylinders). Background technique [0002] In the internal combustion engine disclosed in Japanese Laid-Open (Kokai) Patent Application Publication Hei 7(1995)-189757, combustion in a part of cylinders is temporarily stopped in a low-load operation region in order to reduce pumping loss. As a result, torque variations due to the inertial forces of the pist...

AI Technical Summary

Problems solved by technology

Thus, even in the internal combustion engine disclosed in Japanese Laid-Open (Kokai) Patent Application Publication No. Hei 7-189757, torque variation due to uneven knock intervals cannot be reduced, and thus the mitigation of engine vibration may be insufficient

[0005] In addition, in the Japanese Patent Laid-Open (Patent Opening) Patent Application Publication No. 61-65023, there is no special disclosure of the control of the motor / generator during the temporary stop of a part of the cylinders.

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