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US 8,539,759 B2Granted
Regeneration control system for a particulate filter
AssigneeGM Global Technology Operations LLC
InventorsFrank Ament, David B. Brown
Life of this patent
Estimating the term…
Abstract
A regeneration control system for a particulate filter (PF) includes a condition module and an oxygen-level module. The condition module determines whether an oxygen limiting event is required for the PF during a regeneration event. The oxygen-level control module communicates with the condition module and selectively limits an oxygen level in the PF during the regeneration event.
Claims20
A regeneration control system for a particulate filter (PF) comprising:
- a mass air flow (MAF) sensor that generates a MAF signal;
- a condition module that determines whether an oxygen limiting event is to be performed for the PF during a regeneration event based on the MAF signal;
- an oxygen-level module that communicates with the condition module and selectively limits an oxygen level in the PF during the oxygen limiting event,
- wherein the condition module determines a maximum oxygen content level based on the MAF signal and generates an air flow reduction signal in response to detecting the oxygen level in the PF being greater than the maximum oxygen content level;
- and
- a timer that starts timing when the oxygen-level module limits the oxygen level in the PF, wherein
- the condition module generates a disable signal to disable the timer and stop the limiting of the oxygen level in the PF after a predetermined period,
- in response to the timer expiring and while the oxygen level in the PF is greater than the maximum oxygen content level, the oxygen-level module does not limit the oxygen level in the PF, and
- while the oxygen level in the PF is less than or equal to the maximum oxygen content level, the oxygen-level module limits the oxygen level in the PF and the condition module determines whether the timer has expired.
6 more elements
A method of reducing temperature in a particulate filter (PF) comprising:
- generating a mass air flow (MAF) signal;
- determining whether an oxygen limiting event is to be performed for the PF during a regeneration event based on the MAF signal;
- determining a maximum oxygen content level based on the MAF signal
- selectively limiting an oxygen level in the PF during the oxygen limiting event including generating an air flow reduction signal in response to detecting the oxygen level in the PF being greater than the maximum oxygen content level;
- starting a timer when limiting the oxygen level in the PF;
- generating a disable signal to disable the timer and stop the limiting of the oxygen level in the PF after a predetermined period;
- in response to the timer expiring and while the oxygen level in the PF is greater than the maximum oxygen content level, not limiting the oxygen level in the PF;
- and
- while to the oxygen level in the PF is less than or equal to the maximum oxygen content level, limiting the oxygen level in the PF and determining whether the timer has expired.
6 more elements
Dependencies are inferred from the claim text.