| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique that suppresses degradation in exhaust emissions while preventing sticking of a nozzle vane in an internal combustion engine. SOLUTION: The internal combustion engine is provided with a variable displacement type turbocharger 15, a reducing agent supplying means 3 for supplying a reducing agent to exhaust from upstream of the variable displacement type turbocharger 15, a sticking estimating means 35 for estimating timing of sticking of the nozzle vanes 74 of the variable displacement type turbocharger 15, and a nozzle vane force-opening/closing means 35 for opening and closing the nozzle vanes 74 before the sticking timing of the nozzle vanes 74 estimated by the sticking estimating means 35 and except during the reducing agent supply by the reducing agent supplying means 3. |
