# US 10,865,676 B1 · Emission control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,676 B1 - Document ID: US10865676B1 - Status: Granted - Kind: B1 - Application number: 16/505,131 - Filed: 2019-07-08 - Granted: 2020-12-15 - Earliest claimed: 2019-07-08 - Assignees: DENSO International America, Inc. - Applicants: DENSO International America, Inc. - Inventors: Edward Szczepanski - Web page: https://patentgrep.com/patent/US10865676B1 ## CPC - F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles - F01N 13/009: {having two or more separate purifying devices arranged in series} - F01N 3/021: by means of filters - F01N 3/2026: {directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect} - F01N 9/002: {of filter regeneration} - F02D 41/0295: {Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus} - F01N 3/101: {Three-way catalysts} - F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture - F01N 2560/025: for measuring or detecting O2, e.g. lambda sensors - F01N 2560/14: having more than one sensor of one kind - F01N 2900/1622: Catalyst reducing agent absorption capacity or consumption amount - F01N 2900/1624: Catalyst oxygen storage capacity - Y02T 10/12: Improving ICE efficiencies - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust system includes a catalytic converter, a particulate filter, a first sensor, and a second sensor. The particulate filter is disposed downstream of the catalytic converter. The first sensor is disposed upstream of the catalytic converter and provides an output identifying a quantity of oxygen in an exhaust flow. The second sensor is disposed downstream of the catalytic converter and upstream of the particulate filter and provides an output identifying a quantity of oxygen in the exhaust flow exiting the catalytic converter. ## Claims ### Claim 1 An exhaust system comprising: a catalytic converter; a particulate filter disposed adjacent to and downstream of said catalytic converter; a first sensor disposed upstream of said catalytic converter, said first sensor providing an output identifying a quantity of oxygen in an exhaust flow; a second sensor disposed downstream of said catalytic converter and upstream of said particulate filter, said second sensor separating said particulate filter from said adjacent catalytic converter and said second sensor providing an output identifying a quantity of oxygen in said exhaust flow exiting said catalytic converter and entering said particulate filter; and a controller configured to model a remaining storage capacity for oxygen in said catalytic converter and a remaining storage capacity for oxygen in said particulate filter from an intake air volume, an air-fuel ratio, and a stoichiometric air-fuel ratio, said intake air volume and said stoichiometric air-fuel ratio being predetermined values stored in said controller, and said first sensor being configured to measure said air-fuel ratio of said exhaust flow upstream of said catalytic converter. ### Claim 2 (depends on 1) The exhaust system of claim 1, wherein said controller is configured to receive said quantity of oxygen in said exhaust flow at said first sensor and said quantity of oxygen in said exhaust flow at said second sensor and determining an amount of oxygen stored in said catalytic converter and determining an amount of oxygen available to said particulate filter using said quantity of oxygen in said exhaust flow at said first sensor and said quantity of oxygen in said exhaust flow at said second sensor, and said controller is configured to determine a remaining storage capacity for oxygen in said catalytic converter and a remaining storage capacity for oxygen in said particulate filter using said amount of oxygen stored in said catalytic converter and said amount of oxygen stored in said particulate filter. ### Claim 3 (depends on 2) The exhaust system of claim 2, wherein said controller is configured to maintain said remaining storage capacity for oxygen in said particulate filter at 50% during a normal operation phase, 20% during a pre-regeneration phase, and 80% during a regeneration phase. ### Claim 4 (depends on 2) The exhaust system of claim 2, wherein said controller is configured to command fueling to lean to fill said particulate filter with oxygen during a pre-regeneration phase. ### Claim 5 (depends on 2) The exhaust system of claim 2, wherein said controller is configured to command fueling to rich during a regeneration phase. ### Claim 6 (depends on 1) The exhaust system of claim 1, wherein said first sensor and said second sensor are universal heated exhaust gas oxygen sensors. ### Claim 7 (depends on 1) The exhaust system of claim 1, wherein said first sensor and said second sensor are lambda sensors. ### Claim 8 (depends on 1) The exhaust system of claim 1, wherein said catalytic converter is a three-way catalyst. ### Claim 9 (depends on 1) The exhaust system of claim 1, further comprising an aftertreament device disposed downstream said exhaust flow from said particulate filter. ### Claim 10 A method of controlling an exhaust system comprising: catalyzing, with a catalytic converter, hydrocarbons and nitrous oxide from an exhaust flow from an engine; filtering, with a particulate filter disposed adjacent to and downstream of said catalytic converter, particulate matter from said exhaust flow; detecting, with a first sensor disposed upstream of said catalytic converter, a quantity of oxygen in said exhaust flow; detecting, with a second sensor disposed downstream of said catalytic converter and upstream of said particulate filter, a quantity of oxygen in said exhaust flow exiting said catalytic converter and entering said particulate filter, said second sensor separating said particulate filter from said adjacent catalytic converter; and modeling, with a controller, a remaining storage capacity for oxygen in said catalytic converter and a remaining storage capacity for oxygen in said particulate filter from an intake air volume, and air-fuel ratio, and a stoichiometric air-fuel ratio, said intake air volume and said stoichiometric air-fuel ratio being predetermined values stored in said controller, and said first sensor being configured to measure said air-fuel ratio of said exhaust flow upstream of said catalytic converter. ### Claim 11 (depends on 10) The method of claim 10, further comprising determining, with said controller, an amount of oxygen stored in said catalytic converter and an amount of oxygen available to said particulate filter using said quantity of oxygen in said exhaust flow at said first sensor and said quantity of oxygen in said exhaust flow at said second sensor; and determining said remaining storage capacity for oxygen in said catalytic converter and said remaining storage capacity for oxygen in said particulate filter using said amount of oxygen stored in said catalytic converter and said amount of oxygen available to said particulate filter. ### Claim 12 (depends on 11) The method of claim 11, further comprising maintaining, with said controller, said remaining storage capacity for oxygen in said particulate filter at 50% during a normal operation phase, 20% during a pre-regeneration phase, and 80% during a regeneration phase. ### Claim 13 (depends on 11) The method of claim 11, further comprising commanding, with said controller, fueling to lean to fill said particulate filter with oxygen during a pre-regeneration phase. ### Claim 14 (depends on 11) The method of claim 11, further comprising commanding, with said controller, fueling to rich during a regeneration phase. ### Claim 15 (depends on 10) The method of claim 10, wherein said first sensor and said second sensor are universal heated exhaust gas oxygen sensors. ### Claim 16 (depends on 15) The method of claim 15, further comprising: regenerating the particulate filter, the regenerating including oxidizing the particulate matter collected in the particulate filter; measuring, by the second sensor; the exhaust exiting the catalytic converter during the regeneration of the particulate filter; determining, by the controller, whether there will be enough oxygen to complete the regeneration based on the measurement from the second sensor; discontinuing, by the controller, the regeneration when there is not enough oxygen to complete the regeneration; fueling, by the controller, at a lean lambda condition to fill the catalytic converter and particulate filter with oxygen; and resuming, by the controller, regeneration when the catalytic converter and particulate filter are filled with oxygen. ### Claim 17 (depends on 15) The method of claim 15, further comprising: regenerating the particulate filter, the regenerating including oxidizing the particulate matter collected in the particulate filter; measuring, with at least one of the universal heated exhaust gas oxygen sensors, a pressure sensor, and a temperature sensor, a lambda, a temperature, or a pressure; determining, with the controller, whether the regeneration of the particulate filter will violate oxygen stored limits in the catalytic converter or the particulate filter; introducing, by the controller, a leaner exhaust condition either overall or in a timed interval to supply the remaining oxygen for the regeneration of the particulate filter. ### Claim 18 (depends on 10) The method of claim 10, further comprising treating, with an aftertreatment device disposed downstream from said particulate filter, said exhaust flow exiting said particulate filter.