# US 11,028,760 B2 · Control device for internal combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,760 B2 - Document ID: US11028760B2 - Status: Granted - Kind: B2 - Application number: 16/995,255 - Filed: 2020-08-17 - Published: 2020-12-03 - Granted: 2021-06-08 - Earliest claimed: 2018-12-25 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Kazumasa Katoh; Takahiko Fujiwara; Kenji Igawa; Kentaro Mineo - Web page: https://patentgrep.com/patent/US11028760B2 ## CPC - F01N 11/002: {the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus} - F02D 41/1446: {the characteristics being exhaust temperatures} - F02N 11/0818: {Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode} - B60R 25/30: Detection related to theft or to other events relevant to anti-theft systems - F01N 11/005: {the temperature or pressure being estimated, e.g. by means of a theoretical model} - F01N 2550/04: Filtering activity of particulate filters - F01N 2550/24: Determining the presence or absence of an exhaust treating device - F01N 2560/06: the means being a temperature sensor - F01N 2560/14: having more than one sensor of one kind - F01N 2900/0422: measuring the elapsed time - F01N 2900/1404: Exhaust gas temperature - F02D 41/029: {the exhaust gas treating apparatus being a particulate filter} - F02D 41/1441: {Plural sensors} - F02D 41/22: Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} - F02D 2200/0414: Air temperature - F02D 2200/0802: Temperature of the exhaust gas treatment apparatus - 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) - F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR ## Abstract A control device comprising a first exhaust temperature calculation part calculating a temperature of exhaust flowing into a PM trapping device as a first exhaust temperature, a second exhaust temperature calculation part calculating a temperature of exhaust flowing out from the PM trapping device as a second exhaust temperature, a rate of change over time calculation part calculating a rate of change over time of the first exhaust temperature and a rate of change over time of the second exhaust temperature, and a judgment part judging if the PM trapping device is in a removed state removed from the exhaust passage based on a difference between the rate of change over time of the first exhaust temperature and the rate of change over time of the second exhaust temperature. ## Claims ### Claim 1 A control device for an internal combustion engine, the internal combustion engine comprising: an engine body; and an exhaust after-treatment system installed in an exhaust passage of the engine body, wherein the control device comprises: a first exhaust temperature calculation part configured to calculate a temperature of exhaust flowing into the exhaust after-treatment system as a first exhaust temperature; a second exhaust temperature calculation part configured to calculate a temperature of exhaust flowing out from the exhaust after-treatment system as a second exhaust temperature; a rate of change over time calculation part configured to calculate a rate of change over time of the first exhaust temperature and a rate of change over time of the second exhaust temperature; a judgment part configured to judge if the exhaust after-treatment system is in a removed state removed from the exhaust passage based on a difference between the rate of change over time of the first exhaust temperature and the rate of change over time of the second exhaust temperature; and an intermittent operation run part configured to make the internal combustion engine operate intermittently, wherein the judgment part is further configured to: judge if a state is the removed state based on the difference of the rate of change over time of the first exhaust temperature and the rate of change over time of the second exhaust temperature when a predetermined condition stands; and change the content of the predetermined condition between when intermittent operation of the internal combustion engine is allowed and when not allowed. ### Claim 2 (depends on 1) The control device for the internal combustion engine according to claim 1, wherein the control device further comprises an engine stopping time calculation part configured to calculate an engine stopping time from when the internal combustion engine is stopped to when it is started, and, when intermittent operation of the internal combustion engine is permitted, the predetermined condition is being that when intermittent operation of the internal combustion engine is permitted, the engine stopping time before the internal combustion engine is restarted is made a predetermined time or more and an exhaust flow rate after the internal combustion engine is restarted is made a predetermined flow rate or more, and, when intermittent operation of the internal combustion engine is not permitted, the predetermined condition is being that the rate of change over time of the first exhaust temperature is made not more than a predetermined rate of change which is a negative value. ### Claim 3 A control device for an internal combustion engine, the internal combustion engine comprising: an engine body; and an exhaust after-treatment system installed in an exhaust passage of the engine body, wherein the control device comprises: a first exhaust temperature calculation part configured to calculate a temperature of exhaust flowing into the exhaust after-treatment system as a first exhaust temperature; a second exhaust temperature calculation part configured to calculate a temperature of exhaust flowing out from the exhaust after-treatment system as a second exhaust temperature: a rate of change over time calculation part configured to calculate a rate of change over time of the first exhaust temperature and a rate of change over time of the second exhaust temperature; a judgment part configured to judge if the exhaust after-treatment system is in a removed state removed from the exhaust passage based on a difference between the rate of change over time of the first exhaust temperature and the rate of change over time of the second exhaust temperature; and an intermittent operation run part configured to make the internal combustion engine operate intermittently, wherein the judgment part is configured to: judge a state is the removed state if an integrated value, which is obtained by integrating a certain number or more of values of a differential value between an absolute value of the rate of change over time of the first exhaust temperature and an absolute value of the rate of change over time of the second exhaust temperature, is less than a predetermined threshold value; perform the judgment on whether a state is the removed state when a predetermined condition stands, and change the content of the predetermined condition between when intermittent operation of the internal combustion engine is allowed and when not allowed. ### Claim 4 (depends on 3) The control device for the internal combustion engine according to claim 3, wherein the control device further comprises an engine stopping time calculation part configured to calculate an engine stopping time from when the internal combustion engine is stopped to when it is started, and, when intermittent operation of the internal combustion engine is permitted, the predetermined condition is being that when intermittent operation of the internal combustion engine is permitted, the engine stopping time before the internal combustion engine is restarted is made a predetermined time or more and an exhaust flow rate after the internal combustion engine is restarted is made a predetermined flow rate or more, and, when intermittent operation of the internal combustion engine is not permitted, the predetermined condition is being that the rate of change over time of the first exhaust temperature is made not more than a predetermined rate of change which is a negative value.