# US 10,480,382 B2 · Method for detecting catalyst deterioration of vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,382 B2 - Document ID: US10480382B2 - Status: Granted - Kind: B2 - Application number: 15/838,961 - Filed: 2017-12-12 - Published: 2019-03-14 - Granted: 2019-11-19 - Earliest claimed: 2017-09-08 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Dong-Hoon Lee; Byung-Hoon Cho - Web page: https://patentgrep.com/patent/US10480382B2 ## CPC - F01N 9/002: {of filter regeneration} - F01N 3/0814: {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts} - F01N 3/0864: {Oxygen} - F01N 3/0885: {Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps} - F01N 3/101: {Three-way catalysts} - F01N 3/20: specially adapted for catalytic conversion (F01N3/22 takes precedence) - F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) - F01N 11/007: {the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus} - F01N 2260/04: for regeneration or reactivation, e.g. of catalyst - F01N 2550/02: Catalytic activity of catalytic converters - F01N 2550/03: of sorbing activity of adsorbents or absorbents - F01N 2560/025: for measuring or detecting O2, e.g. lambda sensors - F01N 2900/08: said parameters being related to the engine - F01N 2900/1624: Catalyst oxygen storage capacity - Y02T 10/12: Improving ICE efficiencies - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for detecting catalyst deterioration in a vehicle includes executing a fuel-cut mode of an engine of the vehicle according to a operating state of the vehicle; calculating an oxygen storage capacity (OSC) of a catalyst using an oxygen sensor during the executing of the fuel-cut mode of the engine; and calculating catalyst deterioration based on the calculated OSC. ## Claims ### Claim 1 A method for detecting catalyst deterioration in a vehicle, comprising: executing, by a controller, a fuel-cut mode of an engine of the vehicle according to an operating state of the vehicle; calculating, by the controller, an oxygen storage capacity (OSC) of a catalyst using an oxygen sensor during the executing of the fuel-cut mode of the engine; and calculating, by the controller, catalyst deterioration based on the calculated OSC, wherein the calculating of the OSC of the catalyst comprises: integrating an oxygen flow rate from a time when the executing of the fuel-cut mode of the engine begins to a time at which a measured signal from the oxygen sensor installed at a rear end of the catalyst, indicates a lean region of an air-fuel ratio, thereby obtaining an integrated oxygen value; and setting the OSC of the catalyst as equal to the integrated oxygen value. ### Claim 2 (depends on 1) The method of claim 1, wherein, when a predetermined condition for calculating the OSC of the catalyst is satisfied during the executing of the fuel-cut mode of the engine, the calculating of the OSC of the catalyst is performed, and the calculated OSC is used in the calculating of the catalyst deterioration. ### Claim 3 (depends on 2) The method of claim 2, wherein, when an output voltage of the oxygen sensor is within a predetermined range during the executing of the fuel-cut mode of the engine, the calculating of the OSC of the catalyst is performed, and the calculated OSC is used in the calculating of the catalyst deterioration. ### Claim 4 (depends on 2) The method of claim 2, wherein, when a predetermined amount of time passes after the executing of the fuel-cut mode of the engine begins, the calculating of the OSC of the catalyst is performed, and the calculated OSC is used in the calculating of the catalyst deterioration. ### Claim 5 (depends on 2) The method of claim 2, wherein, when an exhaust gas flow rate is greater than or equal to a predetermined value after the executing of the fuel-cut mode of the engine begins, the calculating of the OSC of the catalyst is performed, and the calculated OSC is used in the calculating of the catalyst deterioration. ### Claim 6 (depends on 2) The method of claim 2, wherein, when a temperature of the catalyst is within a predetermined range after the executing of the fuel-cut mode of the engine begins, the calculating of the OSC of the catalyst begins. ### Claim 7 (depends on 2) The method of claim 2, further comprising: measuring a duration for which the fuel-cut mode is not executed before the executing of the fuel-cut mode of the engine begins, wherein, when the duration for which the fuel-cut mode is not executed is greater than or equal to a predetermined value, the calculating of the OSC of the catalyst is performed, and the calculated OSC is used in the calculating of the catalyst deterioration. ### Claim 8 (depends on 2) The method of claim 2, wherein, when a currently calculated OSC is greater than a previously calculated OSC by a predetermined value or more, the currently calculated OSC is not used in the calculating of the catalyst deterioration. ### Claim 9 (depends on 3) The method of claim 3, wherein the calculating of the catalyst deterioration comprises: comparing an OSC of a catalyst that is not used and an OSC of a boundary catalyst, which has purification ability of a boundary value of an exhaust gas emission standard, with the calculated OSC; and calculating the catalyst deterioration based further on the comparison. ### Claim 10 (depends on 3) The method of claim 3, wherein: the calculating of the OSC of the catalyst is performed a predetermined number of times or more, and the calculating of the catalyst deterioration is performed using an average value of the OSCs calculated the predetermined number of times or more. ### Claim 11 (depends on 3) The method of claim 3, wherein the calculating of the OSC of the catalyst comprises: filtering a measured signal of the oxygen sensor when a predetermined condition is satisfied; and calculating the OSC using the filtered signal. ### Claim 12 (depends on 3) The method of claim 3, further comprising: performing catalyst purging control for regenerating the catalyst using the calculated catalyst deterioration. ### Claim 13 (depends on 3) The method of claim 3, further comprising: performing catalyst activation control using the calculated catalyst deterioration. ### Claim 14 (depends on 3) The method of claim 3, further comprising: when the calculated catalyst deterioration exceeds a predetermined boundary value, notifying a driver of the vehicle that the catalyst deterioration exceeds the predetermined boundary value.