Systems and methods for controlling diesel engine emissions

A method of controlling exhaust emissions emitted by a diesel engine, the method comprising:

• providing exhaust flow stream exiting the diesel engine through a catalyst-based particulate filter;
• providing the exhaust flow exiting the catalyst-based particulate filter through first or second lean NOx trap systems coupled to the catalyst-based particulate filter, the first and second lean NOx trap systems being arranged in a parallel flow configuration with each other, the catalyst-based particulate filter being arranged in a in-series flow configuration with the parallel flow configuration of the first and second lean NOx trap systems;
• performing a regeneration action upon a detection of a pressure level greater than a predetermined level across the catalyst-based particulate filter;
• and
• performing a desulfurization action upon detection of NOx levels across the first or second lean NOx trap systems above than a predetermined NOx level.

A method of controlling exhaust emissions emitted by a diesel engine, the method comprising:

• providing exhaust flow stream exiting the diesel engine through a catalyst-based particulate filter;
• providing the exhaust flow exiting the catalyst-based particulate filter through first or second lean NOx trap systems coupled to the catalyst-based particulate filter, the first and second lean NOx trap systems being arranged in a parallel flow configuration with each other;
• performing a regeneration action upon a detection of a pressure level greater than a predetermined level across the catalyst-based particulate filter;
• and
• performing a desulfurization action upon detection of NOx levels across the first or second lean NOx trap systems above than a predetermined NOx level,
• wherein each of the first and second lean NOx trap systems comprises a first oxidation catalyst device, a sulfur trap device, a lean NOx device, a supplemental fuel injector device, and a plurality of flow diverter devices.