Exhaust aftertreatment system with filter cartridge assembly

A filter cartridge assembly for an aftertreatment unit, the filter cartridge assembly comprising:

• a diesel particulate filter assembly comprising:
• a diesel particulate filter housing comprising:
• a first cylindrical body, and
• a first arcuate flange extending from an edge of the first cylindrical body, wherein the first arcuate flange includes a first aperture, and
• a diesel particulate filter substrate assembly disposed within the first cylindrical body;
• a diesel oxidation catalyst assembly comprising:
• a diesel oxidation catalyst housing comprising:
• a second cylindrical body, and
• a second arcuate flange extending from an edge of the second cylindrical body, wherein the second arcuate flange includes a second aperture aligned with one of the first aperture, and
• a diesel oxidation catalyst substrate assembly disposed within the second cylindrical body;
• and
• a fastener received by the first aperture and the second aperture to releasably couple the diesel oxidation catalyst housing to the diesel particulate filter housing.

A filter cartridge assembly for an aftertreatment unit, the filter cartridge assembly comprising:

• a diesel particulate filter assembly comprising:
• a diesel particulate filter housing comprising:
• a first cylindrical body, and
• a first arcuate flange extending from an edge of the first cylindrical body,
• a diesel particulate filter substrate assembly disposed within the first cylindrical body, and
• a first seal assembly having a first outer diameter, and
• a diesel oxidation catalyst assembly comprising:
• a diesel oxidation catalyst housing comprising:
• a second cylindrical body, and
• a second arcuate flange extending from an edge of the second cylindrical body, the second arcuate flange removably coupled to the first arcuate flange to releasably couple the diesel oxidation catalyst housing to the diesel particulate filter housing,
• a diesel oxidation catalyst substrate assembly disposed within the second cylindrical body, and
• a second seal assembly having a second outer diameter, the second outer diameter less than the first outer diameter.