Patent ID: 8539759
Filing Date: 2013-09-24
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. 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.