# US 11,111,869 B2 · State detection system for internal combustion engine, data analysis device, and hybrid vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,869 B2 - Document ID: US11111869B2 - Status: Granted - Kind: B2 - Application number: 16/928,211 - Filed: 2020-07-14 - Published: 2021-02-04 - Granted: 2021-09-07 - Earliest claimed: 2019-07-31 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Yohsuke Hashimoto; Akihiro Katayama; Yuta Oshiro; Kazuki Sugie; Naoya Oka - Web page: https://patentgrep.com/patent/US11111869B2 ## CPC - F02D 41/1498: {measuring engine roughness} - F02D 41/0085: {Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio} - F02D 41/1454: {the characteristics being an oxygen content or concentration or the air-fuel ratio} - F02D 41/2441: {characterised by the learning conditions} - F02N 11/04: the motors being associated with current generators - F02D 2200/101: Engine speed - F02D 2200/1015: Engines misfires - Y02T 10/62: Hybrid vehicles - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A state detection system for an internal combustion engine includes: a memory configured to store mapping data, the mapping data being data that defines a detection mapping, the detection mapping being a mapping between an input and an output, the input being a first waveform variable and a second waveform variable and the output being a value of a combustion state variable, and the detection mapping including a joint operation of the first waveform variable and the second waveform variable based on a parameter learned by machine learning; and a processor configured to execute an acquisition process and a determination process. The acquisition process acquires a value of the first waveform variable. The determination process determines whether or not the internal combustion engine is in a predetermined operating state. ## Claims ### Claim 1 A state detection system for an internal combustion engine, the state detection system being applied to the internal combustion engine including a crankshaft that is mechanically coupled with a motor-generator, the state detection system being configured to detect a predetermined operating state of the internal combustion engine, the predetermined operating state involving a variation in a combustion state between cylinders, the state detection system comprising: a memory configured to store mapping data, the mapping data being data that defines a detection mapping, the detection mapping being a mapping between an input and an output, the input being a first waveform variable and a second waveform variable and the output being a value of a combustion state variable, and the detection mapping including a joint operation of the first waveform variable and the second waveform variable based on a parameter learned by machine learning, the first waveform variable being a variable including information on a difference in rotation speed of the crankshaft between the cylinders during a period when combustion torque is generated in each of the cylinders, the second waveform variable being a variable indicating time series data of a state quantity indicating a drive state of the motor-generator, the combustion state variable being a variable relating to a degree of variation in the combustion state between the cylinders; and a processor configured to execute an acquisition process and a determination process, the acquisition process being a process of acquiring values of the first waveform variable and the second waveform variable, the value of the first waveform variable being acquired based on an output of a sensor that detects a rotation behavior of the crankshaft, the determination process being configured to determine whether or not the internal combustion engine is in the predetermined operating state, based on an output value of the detection mapping that takes the values of the first waveform variable and the second waveform variable acquired in the acquisition process as an input. ### Claim 2 (depends on 1) The state detection system according to claim 1, wherein the predetermined operating state is a state where a misfire has occurred. ### Claim 3 (depends on 1) The state detection system according to claim 1, wherein the predetermined operating state is a state where an air-fuel ratio varies between the cylinders. ### Claim 4 (depends on 1) The state detection system according to claim 1, wherein the state quantity is torque of the motor-generator. ### Claim 5 (depends on 1) The state detection system according to claim 1, wherein when it is determined by the determination process that the internal combustion engine is in the predetermined operating state, the processor is configured to operate prescribed hardware to execute a handling process for handling the predetermined operating state. ### Claim 6 (depends on 1) The state detection system according to claim 1, wherein: the determination process includes an output value calculation process for calculating an output value of the detection mapping that takes the values of the first waveform variable and the second waveform variable acquired in the acquisition process as an input; the processor includes a first processor mounted on a vehicle, and a second processor disposed outside the vehicle; the first processor is configured to execute the acquisition process and a vehicle-side reception process for receiving a signal based on a calculation result of the output value calculation process; and the second processor is configured to execute the output value calculation process and an outer-side transmission process for transmitting to the vehicle a signal based on the calculation result of the output value calculation process. ### Claim 7 (depends on 6) The state detection system according to claim 6, wherein the second processor and the memory are included in a data analysis device. ### Claim 8 (depends on 6) The state detection system according to claim 6, wherein the first processor is included in a hybrid vehicle.