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US 9,284,870 B2Granted
Electrically heated particulate matter filter soot control system
AssigneeGM Global Technology Operations LLC
InventorsEugene V. Gonze, Michael J. Paratore, Jr., Garima Bhatia
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Abstract
A regeneration system includes a particulate matter (PM) filter with an upstream end for receiving exhaust gas and a downstream end. A control module determines a current soot loading level of the PM filter and compares the current soot loading level to a predetermined soot loading level. The control module permits regeneration of the PM filter when the current soot loading level is less than the predetermined soot loading level.
Claims8
A regeneration method comprising:
- receiving an exhaust gas via an upstream end of a particulate matter (PM) filter;
- determining a current soot loading level of the PM filter;
- comparing the current soot loading level to a predetermined soot loading level;
- regenerating the PM filter when the current soot loading level is less than the predetermined soot loading level;
- limiting the regenerating of the PM filter when the current soot loading level is greater than or equal to the predetermined soot loading level, wherein the predetermined soot loading level corresponds with a predetermined maximum operating temperature of the PM filter;
- and
- when the current soot loading level is greater than the predetermined soot loading level, performing a mitigation strategy to reduce peak temperatures of the PM filter while regenerating the PM filter.
4 more elements
Dependencies are inferred from the claim text.