Control method of internal combustion engine

Abstract

The invention provides a control method of an internal combustion engine. A control method capable of accurately executing transient control at the time of being shifted from whole cylinder operationto partial cylinder operation and capable of preventing generation of abnormal noises at the time of executing switching operation from whole cylinder operation to the partial cylinder operation in aninternal combustion engine provided with a cylinder deactivation mechanism and a valve operation phase variable mechanism for changing an operation phase of an intake valve and / or exhaust valve is provided. A preparation control for suppressing fluctuation of an output torque of the engine at the time of executing switching operation from the whole cylinder operation to the partial cylinder operation is executed when having made a switching request from the whole cylinder operation to the partial cylinder operation. The target switching time executing the switching operation is calculated inaccordance with the valve operation phase after the preparation time is completed. The cylinder deactivation mechanism is controlled such that the switching operation is executed at the target switching time. The target switching time is set in accordance with the valve operation phase at the timing in which the abnormal noises are not generated.

Description

technical field [0001] The present invention relates to a control method of an internal combustion engine provided with a plurality of cylinders, and particularly to a control method of an internal combustion engine provided with a cylinder deactivation mechanism and a valve operating phase variable mechanism, wherein the cylinder deactivation mechanism performs the operation of disabling one of the plurality of cylinders. The valve operation phase variable mechanism changes the operation phase of the intake valve and / or exhaust valve provided in each cylinder for switching between partial cylinder operation in which some cylinders are operated and all cylinder operation in which all cylinders are operated. Background technique [0002] Patent Document 1 discloses a control device for an internal combustion engine including a variable valve operating phase mechanism for changing the operating phases of the above-mentioned cylinder deactivation mechanism and intake valves. Ac...

AI Technical Summary

Problems solved by technology

The control device of Patent Document 1 is a device characterized in the method of controlling the operating phase of the intake valve after switching from all-cylinder operation to partial-cylinder operation, and does not take into account the suppression of noise accompanying the switching operation.

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