System and method for regulating exhaust emissions

摘要

An exhaust gas treatment system for an internal combustion engine includes an exhaust gas pathway configured to receive exhaust gas from the internal combustion engine, an ammonia source, and a first ammonia injector in fluid communication with the ammonia source. The first ammonia injector is configured to inject ammonia into the exhaust gas pathway at a first rate. The exhaust gas treatment system also includes a first treatment element positioned downstream of the first ammonia injector and a second ammonia injector in fluid communication with the ammonia source and positioned downstream of the first treatment element. The second ammonia injector is configured to inject ammonia into the exhaust gas pathway at a second rate different from the first rate. The exhaust gas treatment system further includes a second treatment element positioned downstream of the second ammonia injector.

主权项

1. An exhaust gas treatment system for an internal combustion engine, the system comprising:
an exhaust gas pathway configured to receive exhaust gas from the internal combustion engine; an ammonia source; a first ammonia injector in fluid communication with the ammonia source and configured to inject ammonia into the exhaust gas pathway at a first rate; a first treatment element positioned downstream of the first ammonia injector; a second ammonia injector in fluid communication with the ammonia source and positioned downstream of the first treatment element, the second ammonia injector configured to inject ammonia into the exhaust gas pathway at a second rate different from the first rate; and a second treatment element positioned downstream of the second ammonia injector.