# US 2022/0044503 A1 · Abnormality detection device for exhaust gas sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0044503 A1 - Document ID: US20220044503A1 - Status: Published application - Kind: A1 - Application number: 17/381,578 - Filed: 2021-07-21 - Published: 2022-02-10 - Earliest claimed: 2020-08-07 - Assignees: Kawasaki Jukogyo Kabushiki Kaisha - Applicants: Kawasaki Jukogyo Kabushiki Kaisha - Inventors: Sayaka Gotou; Kenichi Jino; Kouta Suzuki - Web page: https://patentgrep.com/patent/US20220044503A1 ## CPC - F01N 3/08: for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92) - G07C 5/10: using counting means or digital clocks - B62J 45/41: characterised by the type of sensor - B62M 7/02: with engine between front and rear wheels - B62M 7/04: below the frame - F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus - G01M 15/104: {using oxygen or lambda-sensors (testing catalytic converters F01N3/18, F01N11/007)} - F01N 1/00: Silencing apparatus characterised by method of silencing - F01N 2550/00: Monitoring or diagnosing the deterioration of exhaust systems - F01N 2560/00: Exhaust systems with means for detecting or measuring exhaust gas components or characteristics - F01N 2560/025: for measuring or detecting O2, e.g. lambda sensors - F01N 2590/04: for motorcycles - F01N 2900/0416: using the state of a sensor, e.g. of an exhaust gas sensor - 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 - B62J: CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS - B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An abnormality detection device determines abnormality in an exhaust gas sensor, disposed in an exhaust passage of an engine to detect a component in exhaust gas. The abnormality detection device includes: a responsiveness determination unit configured to calculate responsiveness of the exhaust gas sensor on the basis of a timewise change of output values of the exhaust gas sensor; and an abnormality determination unit configured to determine that the exhaust gas sensor has abnormality when the responsiveness calculated by the responsiveness determination unit is lower than a predetermined responsiveness threshold. The abnormality determination unit determines if the exhaust gas sensor has abnormality, excluding an excluded period during which a slope of the output values becomes zero or is inversed with respect to a preceding trend of the timewise change while the output values of the exhaust gas sensor timewisely change between a predetermined first and second determination values. ## Claims ### Claim 1 An abnormality detection device configured to determine abnormality in an exhaust gas sensor configured to be disposed in an exhaust passage of an internal combustion engine and to detect a component in exhaust gas, the abnormality detection device comprising: a responsiveness determination unit configured to calculate responsiveness of the exhaust gas sensor on the basis of a timewise change of output values of the exhaust gas sensor; and an abnormality determination unit configured to determine that the exhaust gas sensor has abnormality when the responsiveness calculated by the responsiveness determination unit is lower than a predetermined responsiveness threshold, wherein the abnormality determination unit is configured to determine if the exhaust gas sensor has abnormality, excluding an excluded period during which a slope of the output values becomes zero or is inversed with respect to a preceding trend of the timewise change while the output values of the exhaust gas sensor timewisely change between a predetermined first determination value and a second determination value. ### Claim 2 (depends on 1) The abnormality detection device as claimed in claim 1, wherein the abnormality determination unit is configured to detect an excluded period on the basis of a differential value of the timewise change of the detected values. ### Claim 3 (depends on 1) The abnormality detection device as claimed in claim 1, wherein the exhaust gas sensor is an oxygen sensor configured to detect an oxygen concentration in the exhaust gas. ### Claim 4 (depends on 1) The abnormality detection device as claimed in claim 1, further comprising an abnormality notification unit configured to notify abnormality when the abnormality determination unit determines that there is abnormality. ### Claim 5 (depends on 1) The abnormality detection device as claimed in claim 1, wherein the internal combustion engine is a multicylinder engine including cylinders and exhaust pipes connected to the respective cylinders, the exhaust pipes converging into a single pipe, and the exhaust gas sensor is attached to the single pipe. ### Claim 6 (depends on 1) A motorcycle comprising the abnormality detection device as claimed in claim 1. ### Claim 7 (depends on 6) The motorcycle as claimed in claim 6, further comprising: a steering handlebar; a rider seat; and an engine, which is the internal combustion engine, disposed between the handlebar and the seat in a longitudinal direction of a vehicle body of the motorcycle, the exhaust passage extends forward from a front side of the engine and is bent so as to extend rearward with respect to the engine, and the exhaust gas sensor is disposed at a forward region with respect to a cylinder axis of the engine in the exhaust passage. ### Claim 8 A method for detecting abnormality in an exhaust gas sensor disposed in an exhaust passage of an internal combustion engine and configured to detect a component in exhaust gas, the method comprising: a responsiveness determination step of calculating responsiveness of the exhaust gas sensor on the basis of a timewise change of output values of the exhaust gas sensor; an exclusion determination step of determining an excluded period when a changing trend of the output values of the exhaust gas sensor with respect to a preceding trend of the timewise change satisfies a predetermined condition for the excluded period; and an abnormality determination step of determining if the exhaust gas sensor has abnormality on the basis of the responsiveness calculated in the responsiveness determination step, excluding the excluded period.