Patent ID: 7861521

Claim:
A method for injecting fuel into an exhaust system of a diesel engine, the exhaust system including a catalytic converter including a catalyst that promotes oxidation at the catalytic converter, the exhaust system also including a diesel particulate filter positioned downstream from the catalytic converter, the method comprising: injecting fuel at a first fuel injection rate a majority of the engine operational time to limit the oxidation of NO to NO 2 at the catalytic converter, the fuel being injected into the exhaust system from an injection location located upstream from the catalytic converter and downstream from the diesel engine; and injecting fuel from the injection location at a second fuel injection rate a minority of the engine operational time, the second fuel injection rate being higher than the first fuel injection rate, wherein the fuel injected at the second fuel injection rate is combusted at the catalytic converter to provide sufficient heat to cause regeneration of the diesel particulate filter.