# US 2019/0376433 A1 · On-board diagnostic method for monitoring diesel oxidation catalyst function via brick temperature rise > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376433 A1 - Document ID: US20190376433A1 - Status: Published application - Kind: A1 - Application number: 16/006,148 - Filed: 2018-06-12 - Published: 2019-12-12 - Earliest claimed: 2018-06-12 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Michelle H. Wiebenga; Se H. Oh; Giovanni Montinaro - Web page: https://patentgrep.com/patent/US20190376433A1 ## CPC - F01N 11/002: {the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus} - F01N 3/103: {Oxidation catalysts for HC and CO only} - F01N 3/2033: {using a fuel burner or introducing fuel into exhaust duct} - F01N 3/2066: {Selective catalytic reduction [SCR]} - 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) - G07C 5/0808: {Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005)} - G07C 5/0841: {Registering performance data (recording measured values G01D; information storage G11B)} - F01N 2550/02: Catalytic activity of catalytic converters - F01N 2560/06: the means being a temperature sensor - F01N 2610/02: the substance being ammonia or urea - F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel - F01N 2900/0422: measuring the elapsed time - F01N 2900/1404: Exhaust gas temperature - 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) - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for monitoring diesel oxidation catalyst function via a brick temperature rise includes pre-storing hydrocarbons on a catalyst coating in a catalyst coated body. A diesel oxidation catalyst (DOC) exhaust treatment device is positioned in an exhaust conduit of a diesel engine. The DOC exhaust treatment device includes the catalyst coated body. A first exhaust gas temperature output defining an inlet gas temperature received in the DOC exhaust treatment device is forwarded to a control module. A time for the inlet gas temperature to reach a target temperature is recorded in the control module. The time for the inlet gas temperature to reach the target temperature is compared in the control module to a time required for a brick temperature of the catalyst coated body to reach the same target temperature. ## Claims ### Claim 1 A method for monitoring diesel oxidation catalyst function via a brick temperature rise, comprising: positioning a diesel oxidation catalyst (DOC) exhaust treatment device in an exhaust conduit receiving exhaust from a diesel engine, the DOC exhaust treatment device having a catalyst coated body; measuring an inlet gas temperature to the DOC exhaust treatment device and forwarding the inlet gas temperature to a control module; recording a time for the inlet gas temperature to reach a target temperature in the control module; and comparing in the control module the time for the inlet gas temperature to reach the target temperature to a time required for a brick temperature of the catalyst coated body to reach the same target temperature. ### Claim 2 (depends on 1) The method of claim 1, wherein the determining step further includes positioning a first exhaust gas temperature sensor in the exhaust conduit upstream of the DOC exhaust treatment device. ### Claim 3 (depends on 2) The method of claim 2, further including positioning a second exhaust gas temperature sensor within the catalyst coated body, an output signal from the second exhaust gas temperature sensor forwarded to the control module and defining the brick temperature of the catalyst coated body. ### Claim 4 (depends on 3) The method of claim 3, further including: creating a bore in the catalyst coated body adapted to receive the second exhaust gas temperature sensor; and fixing the second exhaust gas temperature sensor within the bore. ### Claim 5 (depends on 4) The method of claim 4, further including positioning the second exhaust gas temperature sensor within the bore proximate to a longitudinal centerline of the catalyst coated body. ### Claim 6 (depends on 1) The method of claim 1, further including storing hydrocarbons on a catalyst coating in the catalyst coated body. ### Claim 7 (depends on 6) The method of claim 6, wherein the determining step further includes measuring the brick temperature. ### Claim 8 (depends on 1) The method of claim 1, wherein the determining step further includes predicting a temperature immediately inside an inlet face of the DOC exhaust treatment device via a mathematical model using the measured inlet gas temperature. ### Claim 9 (depends on 8) The method of claim 8, further including: generating the brick temperature of the catalyst coated body using an exhaust gas temperature sensor positioned within the catalyst coated body; and forwarding an output signal from the exhaust gas temperature sensor to the control module. ### Claim 10 (depends on 9) The method of claim 9, further including: creating a bore in the catalyst coated body adapted to receive the exhaust gas temperature sensor; and positioning the exhaust gas temperature sensor within the bore. ### Claim 11 A method for monitoring diesel oxidation catalyst function via a brick temperature rise, comprising: pre-storing hydrocarbons on a catalyst coating in a catalyst coated body; positioning a diesel oxidation catalyst (DOC) exhaust treatment device in an exhaust conduit of a diesel engine, the DOC exhaust treatment device including the catalyst coated body; forwarding a first exhaust gas temperature output defining an inlet gas temperature received in the DOC exhaust treatment device to a control module; recording in the control module a time for the inlet gas temperature to reach a target temperature; and comparing in the control module the time for the inlet gas temperature to reach the target temperature to a time required for a brick temperature of the catalyst coated body to reach the same target temperature. ### Claim 12 (depends on 11) The method of claim 11, further including positioning a first exhaust gas temperature sensor in the exhaust conduit upstream of the DOC exhaust treatment device to measure the first exhaust gas temperature output. ### Claim 13 (depends on 12) The method of claim 12, further including positioning a second exhaust gas temperature sensor within the catalyst coated body to generate the brick temperature of the catalyst coated body. ### Claim 14 (depends on 11) The method of claim 11, wherein the target temperature is approximately 275 degrees Centigrade. ### Claim 15 (depends on 11) The method of claim 11, wherein the target temperature ranges between approximately 150 degrees Centigrade to 350 degrees Centigrade. ### Claim 16 (depends on 11) The method of claim 11, wherein if the time for the brick temperature of the catalyst coated body to reach the target temperature is less than the time for the inlet gas temperature to reach the same target temperature, a DOC healthy signal is generated by the control module. ### Claim 17 (depends on 11) The method of claim 11, wherein if the time for the inlet gas temperature to reach the target temperature is less than the time required for the brick temperature of the catalyst coated body to reach the same target temperature, a DOC un-healthy signal is generated by the control module. ### Claim 18 A method for monitoring diesel oxidation catalyst function via a brick temperature rise, comprising: providing a first exhaust gas temperature sensor outputting a first exhaust gas temperature for an exhaust conduit collecting exhaust from a diesel engine; positioning a diesel oxidation catalyst (DOC) exhaust treatment device in the exhaust conduit downstream of the first exhaust gas temperature sensor, the DOC exhaust treatment device having a catalyst coated body; incorporating a second exhaust gas temperature sensor in the catalyst coated body of the DOC exhaust treatment device; forwarding an output signal from each of the first exhaust gas temperature sensor defining an inlet gas temperature received in the DOC exhaust treatment device, and an output signal from the second exhaust gas temperature sensor defining a brick temperature of the catalyst coated body to a control module; recording in the control module a time for the inlet gas temperature to reach a target temperature; and comparing in the control module the time for the inlet gas temperature to reach the target temperature to a time required for the brick temperature of the catalyst coated body to reach the same target temperature. ### Claim 19 (depends on 18) The method of claim 18, wherein: if the time for the brick temperature of the catalyst coated body to reach the target temperature is less than the time for the inlet gas temperature to reach the same target temperature a DOC healthy signal is generated; or if the time for the inlet gas temperature to reach the target temperature is less than the time required for the brick temperature of the catalyst coated body to reach the target temperature a DOC un-healthy signal is generated. ### Claim 20 (depends on 18) The method of claim 18, further including incorporating the second exhaust gas temperature sensor in a bore of the catalyst coated body along a longitudinal axis of the catalyst coated body.