Controller for variable valve mechanism

摘要

An internal combustion engine includes a plurality of cylinders, intake valves (31) provided respectively in the cylinders, and a variable valve mechanism (600) for changing a valve characteristic of the intake valves (31). A motor (210) drives the variable valve mechanism (600). A motor controller (150) controls the motor (210). The internal combustion engine can be operated in a cylinder deactivation mode for retaining the intake valves (31) of some of the cylinders in a valve closing state. When the internal combustion engine returns from the cylinder deactivation mode, the motor controller (150) executes overlap adjustment processing for controlling the valve characteristic such that valve opening periods of the intake valves (31) are not overlapped between the cylinders.

主权项

1. A controller for a variable valve mechanism applied to an internal combustion engine including a plurality of cylinders, intake valves provided respectively in the cylinders, and a variable valve mechanism for changing a valve characteristic of the intake valves, wherein the internal combustion engine is capable of switching an operation mode between a cylinder deactivation mode for retaining the intake valves of some of the cylinders in a valve closing state and an all-cylinder operation mode for performing opening and closing actions of the intake valves of all the cylinders, the controller comprising:
a control section for controlling the valve characteristic, wherein the control section is capable of setting, as the valve characteristic at the time of executing the all-cylinder operation mode, a valve characteristic with which an overlap is generated in valve opening periods of the intake valves between the cylinders, and when the internal combustion engine returns from the cylinder deactivation mode, the control section is configured to execute overlap adjustment processing for controlling the valve characteristic such that an overlap amount in the valve opening periods of the intake valves between the cylinders becomes smaller than an overlap amount set in the all-cylinder operation mode.