| 摘要 |
An exhaust gas purifying device that is provided in an exhaust passage of an internal combustion engine and purifies exhaust gas, and a reducing agent injection valve that injects fuel to a position upstream of the exhaust gas purifying device in the exhaust passage are provided. A timing for injecting fuel from the reducing agent injection valve is adjusted to match a timing when exhaust gas discharged on an exhaust stroke of each of cylinders of the internal combustion engine reaches the position to which fuel is injected from the reducing agent injection valve. A single injection amount is changed in accordance with a condition of combustion exhaust gas that is discharged on one exhaust stroke of each of the cylinders and reaches the point to inject fuel.
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