# US 8,539,759 B2 · Regeneration control system for a particulate filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,759 B2 - Document ID: US8539759B2 - Status: Granted - Kind: B2 - Application number: 11/531,466 - Filed: 2006-09-13 - Published: 2008-03-13 - Granted: 2013-09-24 - Earliest claimed: 2006-09-13 - Assignees: GM Global Technology Operations LLC - Applicants: Frank Ament; David B. Brown - Inventors: Frank Ament; David B. Brown - Web page: https://patentgrep.com/patent/US8539759B2 ## CPC - F01N 9/002: {of filter regeneration} - F01N 3/103: {Oxidation catalysts for HC and CO only} - F01N 13/009: {having two or more separate purifying devices arranged in series} - F01N 13/107: {More than one exhaust manifold or exhaust collector} - F02D 41/029: {the exhaust gas treating apparatus being a particulate filter} - F02D 41/1446: {the characteristics being exhaust temperatures} - F02D 41/18: by measuring intake air flow - F01N 2560/025: for measuring or detecting O2, e.g. lambda sensors - F01N 2560/06: the means being a temperature sensor - F02B 1/12: with compression ignition (with fuel-air charge ignited by compression ignition of an additional fuel F02B7/00) - F02B 3/06: with compression ignition (compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02) - F02B 37/22: by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) - F02D 2200/0812: Particle filter loading - F02D 2250/14: Timing of measurement, e.g. synchronisation of measurements to the engine cycle - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - Y02T 10/40: Engine management systems - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The regeneration control system of claim 1 wherein the condition module determines whether to limit the oxygen level in the PF based on at least one of an oxygen level signal and a temperature signal. ### Claim 3 (depends on 2) The regeneration control system of claim 2 wherein the oxygen-level module limits the oxygen level in the PF during the oxygen limiting event in response to the oxygen level signal exceeding the maximum oxygen content level. ### Claim 4 (depends on 3) The regeneration control system of claim 3 wherein the oxygen-level module limits the oxygen level in the PF during the oxygen limiting event in response to the temperature signal exceeding a temperature threshold. ### Claim 5 (depends on 4) The regeneration control system of claim 4 wherein the oxygen-level module limits the oxygen level in the PF during the oxygen limiting event when the MAF signal does not exceed an airflow threshold. ### Claim 6 (depends on 1) The regeneration control system of claim 1 wherein the oxygen-level module limits the oxygen level in the PF with at least one of an exhaust gas recirculation valve, a variable nozzle turbine turbo, and a throttle. ### Claim 7 (depends on 1) The regeneration control system of claim 1 wherein the oxygen-level module refrains from limiting the oxygen level in the PF in response to the disable signal being generated. ### Claim 8 (depends on 1) The regeneration control system of claim 1 wherein the oxygen-level module generates a control signal based on the air flow reduction signal to adjust at least one of a throttle, an exhaust gas recirculation valve and a turbine turbo. ### Claim 9 (depends on 1) The regeneration control system of claim 1 wherein the condition module determines the maximum oxygen content level based on an exhaust flow rate. ### Claim 10 (depends on 1) The regeneration control system of claim 1 wherein the oxygen-level module generates a control signal based on the air flow reduction signal to adjust a throttle, an exhaust gas recirculation valve and a turbine turbo. ### Claim 11 (depends on 1) The regeneration control system of claim 1, wherein the condition module generates the air flow reduction signal to prevent the oxygen level in the PF from being greater than the maximum oxygen content level. ### Claim 12 (depends on 1) The regeneration control system of claim 1 wherein: the condition module (i) determines a temperature of exhaust gases received by the PF, and (ii) determines whether the oxygen level in the PF is greater than the maximum oxygen content level in response to the temperature of exhaust gases received by the PF being greater than a temperature threshold; the timer is started in response to the temperature of exhaust gases received by the PF being greater than the temperature threshold; and the oxygen-level module ceases to limit the oxygen level in the PF in response to the timer expiring. ### Claim 13 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. ### Claim 14 (depends on 13) The method of claim 13 further comprising determining whether to limit the oxygen level in the PF during the oxygen limiting event based on at least one of an oxygen level signal and a temperature signal. ### Claim 15 (depends on 14) The method of claim 14 further comprising limiting the oxygen level in the PF during the oxygen limiting event in response to the oxygen level signal exceeding the maximum oxygen content level. ### Claim 16 (depends on 15) The method of claim 15 further comprising limiting the oxygen level in the PF during the oxygen limiting event in response to the temperature signal exceeding a temperature threshold. ### Claim 17 (depends on 16) The method of claim 16 further comprising limiting the oxygen level in the PF during the oxygen limiting event when the MAF signal does not exceed an airflow threshold. ### Claim 18 (depends on 13) The method of claim 13 further comprising limiting the oxygen level in the PF with at least one of an exhaust gas recirculation valve, a variable nozzle turbine turbo, and a throttle. ### Claim 19 (depends on 13) The method of claim 13 further comprising refraining from limiting the oxygen level in the PF when the disable signal is generated. ### Claim 20 (depends on 13) The method of claim 13 further comprising: determining a temperature of exhaust gases received by the PF determining whether the oxygen level in the PF is greater than the maximum oxygen content level in response to the temperature of exhaust gases received by the PF being greater than a temperature threshold; starting the timer in response to the temperature of exhaust gases received by the PF being greater than the temperature threshold; and ceasing to limit the oxygen level in the PF in response to the timer expiring.