| 摘要 |
The engine control device controls a direct fuel injection type spark-ignition engine provided with a fuel injection valve for directly injecting fuel into each cylinder and a spark plug for generating a spark for igniting an air-fuel mixture in the cylinder. When an exhaust purification catalyst provided on an exhaust path needs to be warmed up, the engine control device executes a catalyst warm-up operation whereby the fuel is injected while the compression stroke is in progress, and the ignition timing is delayed. While the catalyst warm-up operation is being executed, the engine control device increases a valve overlap amount in accordance with a piston crown temperature such that the temperature of the piston crown is increased. |
