| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine less in adhesion of an injected reducing agent to an exhaust passage despite the injection of the reducing agent into an exhaust port. SOLUTION: This exhaust emission control device for a multicylindered internal combustion engine is provided with an NOx control means 11, which stores NOx in a lean operation and discharges the stored NOx in a rich operation to reduce, on an exhaust system. Further, the device has a cylinder 13a, in which an injector 17 for feeding the reducing agent is installed to prepare the rich operation in the exhaust port 14 of the cylinder 13 or directly in a cylinder 13, in a part of a plurality of cylinders. An exhaust pipe 16a communicating with the exhaust port 14a of the above cylinder 13a is prepared independently of the exhaust manifold 15b for the other cylinders 13b, and is converged with an exhaust pipe 16b communicating with the above exhaust manifold 15b at the upstream side of the NOx control means 11.</p> |
