| 主权项 |
1. A control device for an internal combustion engine, the internal combustion engine including an air amount adjusting device, a fuel supply device, and an EGR device, the air amount adjusting device being configured to adjust an amount of air flowing into a combustion chamber of the internal combustion engine, the fuel supply device being configured to supply a fuel into the combustion chamber, the EGR device being configure to adjust an EGR rate, the EGR rate being a ratio of exhaust gas in the air flowing into the combustion chamber, the internal combustion engine being configured to execute an operation based on a first air-fuel ratio and an operation based on a second air-fuel ratio leaner than the first air-fuel ratio by adjusting the air amount adjusting device and the fuel supply device, and the control device comprising:
an electronic control unit configured to perform an operation mode switching control by: i) performing the operation based on the first air-fuel ratio when the electronic control unit controls to decrease the amount of the air flowing into the combustion chamber in response to a predetermined torque reduction request and decrease the EGR rate by adjusting the EGR device and when an immediately preceding EGR rate, which is the EGR rate immediately before the torque reduction request is made, is lower than a first threshold, and ii) performing a stratified combustion operation based on the second air-fuel ratio when the immediately preceding EGR rate is equal to or higher than the first threshold. |
