CONTROL DEVICE AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

At the time of increasing an actual intake air amount by increasing a valve overlap period of intake and exhaust valves (2; 3), an actual compression ratio is temporarily decreased to be lower than a steady-state target compression ratio. This makes it possible to increase the valve overlap period without causing interference of the intake and exhaust valves (2; 3) with a piston (8).

主权项

1. A control device for an internal combustion engine, comprising:
a variable compression ratio mechanism that varies an actual compression ratio of the internal combustion engine by changing a top dead center position of a piston reciprocating in a cylinder; a variable valve mechanism that varies a valve overlap period of intake and exhaust valves by changing an actual valve timing of at least one of the intake and exhaust valves; a target compression ratio setting portion that sets a steady-state target compression ratio such that the target compression ratio becomes decreased with increase in actual intake air amount; a variable valve control portion that controls the variable valve mechanism within a range that avoids interference between the piston and the intake and exhaust valves; and a compression ratio correction portion that decreases the actual compression ratio to be lower than the steady-state target compression ratio at the time when the actual intake air amount should be increased by increase of the valve overlap period.