| 摘要 |
An object of this invention is to appropriately control the valve timing (VT) even in a case where a plurality of local maximum points or local minimum points exist on a characteristic line representing a relation between the VT and an air amount. An engine 10 includes VVTs 42 and 44 and the like. When a predetermined operation condition that a plurality of local maximum points exist on a load characteristic line representing a relation between the VT of an intake valve 32 and a load KL is established, an ECU 60 first calculates the VT corresponding to a maximum value KLmax of the load KL as a maximum air amount VT (VTmax). Subsequently, if the maximum value KLmax of the load is less than a target KL, the ECU 60 changes the VT towards VTmax. Thus, the direction in which the VT is changed is determined based on VTmax that is calculated irrespective of a change tendency (slope) of the characteristic line or the like at the current time. Therefore, even when a plurality of local maximum points exist on a characteristic line of an air amount index, it is possible to prevent the VT from being guided by the slope of a characteristic line or the like and latching onto a local maximum point that is not the optimal point. |
| 主权项 |
1. A control device for an internal combustion engine, comprising:
valve timing varying unit that is capable of changing a valve timing of an intake valve, and intake valve control unit for setting a target value of an air amount index in which an air amount in a cylinder is reflected, and also calculating a target valve timing that is a target value of the valve timing of the intake valve based on the target value of the air amount index, and controlling the valve timing of the intake valve so that the valve timing matches the target valve timing by driving the valve timing varying unit; wherein the intake valve control unit comprises: maximum air amount VT calculation unit for, in a case where a predetermined operation condition that a plurality of local maximum points exist on a characteristic line representing a relation between the valve timing of the intake valve and the air amount index is established, calculating a valve timing corresponding to a maximum value of the air amount index as a maximum air amount VT, and air amount maximizing unit for, in a case where the operation condition is established and the maximum value of the air amount index is less than the target value, changing the valve timing of the intake valve towards the maximum air amount VT. |
