| 主权项 |
1. A control device for an internal combustion engine that has a first actuator that changes an amount of air that is taken into a cylinder, a second actuator that supplies fuel into the cylinder, and a third actuator that ignites a mixture gas in the cylinder, and is configured to be capable of selecting an operation that makes a first air-fuel ratio a target air-fuel ratio and an operation that makes a second air-fuel ratio that is leaner than the first air-fuel ratio a target air-fuel ratio, comprising:
requested torque reception means for receiving a requested torque; target air amount calculation means for calculating a target air amount for achieving the requested torque from the requested torque by using a virtual air-fuel ratio which is a parameter that provides a conversion efficiency from an air amount to torque; virtual air-fuel ratio changing means for changing the virtual air-fuel ratio from the first air-fuel ratio to the second air-fuel ratio, in response to a condition for switching an operation mode from an operation by the first air-fuel ratio to an operation by the second air-fuel ratio being satisfied; target air-fuel ratio switching means for switching a target air-fuel ratio from the first air-fuel ratio to the second air-fuel ratio, after the virtual air-fuel ratio is changed from the first air-fuel ratio to the second air-fuel ratio; first actuator control means for determining an operation amount of the first actuator based on the target air amount, and operating the first actuator in accordance with the operation amount; second actuator control means for determining a fuel supply amount based on the target air-fuel ratio, and operating the second actuator in accordance with the fuel supply amount; and third actuator control means for determining an ignition timing for achieving the requested torque based on a torque that is estimated from the operation amount of the first actuator and the target air-fuel ratio, and the requested torque, and operating the third actuator in accordance with the ignition timing, wherein the first actuator includes a variable valve timing mechanism that changes a valve timing of an intake valve, the first actuator control means comprises means for calculating a first valve timing that is a target valve timing corresponding to the first air-fuel ratio based on the target air amount, means for calculating a second valve timing that is a target valve timing corresponding to the second air-fuel ratio based on the target air amount, target valve timing switching means for switching the target valve timing from the first valve timing to the second valve timing after the virtual air-fuel ratio is changed from the first air-fuel ratio to the second air-fuel ratio, and means for operating the variable valve timing mechanism in accordance with the target valve timing. |
