# US 12,215,643 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 12,215,643 B2 - Document ID: US12215643B2 - Status: Granted - Kind: B2 - Application number: 18/562,060 - Filed: 2022-02-02 - Published: 2024-07-11 - Granted: 2025-02-04 - Earliest claimed: 2021-06-17 - Assignees: Hitachi Astemo, Ltd. - Applicants: Hitachi Astemo, Ltd. - Inventors: Kazuhiro Oryoji; Yoshihiko Akagi - Web page: https://patentgrep.com/patent/US12215643B2 ## CPC - F02D 41/005: {according to engine operating conditions} - F02D 41/0077: {Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48)} - F02D 35/028: {by determining the combustion timing or phasing} - F02D 37/02: one of the functions being ignition - F02D 41/009: {using means for generating position or synchronisation signals} - F02P 5/145: using electrical means - F02P 5/1502: {using one central computing unit} - F02P 9/002: {Control of spark intensity, intensifying, lengthening, suppression (by means of current control in the storage devices F02P3/05, F02P3/09, during starting F02P15/12)} - F02D 2200/024: Fluid pressure of lubricating oil or working fluid - Y02T 10/40: Engine management systems - 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) - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a control device for an internal combustion engine capable of realizing an operation of the internal combustion engine in a state in which a dilution is close to a limit. A processor (CPU 23a) of a control device for an internal combustion engine calculates a change amount of a parameter (for example, a combustion center position) indicating a combustion state of the internal combustion engine (combustion center change amount calculation unit 32). The processor (CPU 23a) corrects an operation amount of an actuator (for example, an EGR valve) that adjusts a dilution of an air-fuel mixture according to a difference between the change amount of the parameter indicating the combustion state and a target value of the change amount, and brings the change amount close to the target value (actuator operation amount correction unit 33). ## Claims ### Claim 1 A control device for an internal combustion engine, the control device comprising a processor configured to: calculate a change amount of a parameter indicating a combustion state of the internal combustion engine, and correct an operation amount of an actuator that adjusts a dilution of an air-fuel mixture according to a difference between the change amount of the parameter indicating the combustion state and a target value of the change amount, and bring the change amount close to the target value, wherein the actuator is an EGR valve, and the processor is configured to increase an opening of the EGR valve as the difference increases in a case where the change amount of the parameter indicating the combustion state is less than the target value, decrease the opening of the EGR valve as the difference increases and advance an ignition timing in a case where the change amount of the parameter indicating the combustion state is more than the target value, and increase discharge energy generated in an ignition device in a case where the change amount does not decrease after the ignition timing is advanced. ### Claim 2 (depends on 1) The control device for the internal combustion engine according to claim 1, wherein the parameter indicating the combustion state is an index having a correlation with a combustion ratio of the air-fuel mixture, a crank angle at which the combustion ratio of the air-fuel mixture takes a predetermined value, a maximum value of an in-cylinder pressure, or a crank angle at which the in-cylinder pressure is maximum. ### Claim 3 (depends on 1) The control device for the internal combustion engine according to claim 1, wherein the parameter indicating the combustion state is a combustion center position, and the processor is configured to estimate an in-cylinder pressure of the internal combustion engine based on a crank angular velocity at a first timing after the ignition timing and a crank angular velocity at a second timing before an exhaust valve is opened, and estimate the combustion center position by using the estimated in-cylinder pressure, or estimate the combustion center position by using an in-cylinder pressure detected by a sensor. ### Claim 4 (depends on 1) The control device for the internal combustion engine according to claim 1, wherein the processor is configured to correct the operation amount of the actuator in a case where an intake system state is a steady state, a traveling state is a constant speed state, or the traveling state is a constant acceleration state. ### Claim 5 (depends on 1) The control device for the internal combustion engine according to claim 1, wherein the change amount is a deviation indicating a difference from a reference value, and the reference value is a value of the parameter indicating the combustion state in a previous combustion cycle. ### Claim 6 A control device for an internal combustion engine, the control device comprising a processor configured to: calculate a change amount of a parameter indicating a combustion state of the internal combustion engine, and correct an operation amount of an actuator that adjusts a dilution of an air-fuel mixture according to a difference between the change amount of the parameter indicating the combustion state and a target value of the change amount, and bring the change amount close to the target value, wherein the actuator is an EGR valve, and the processor is configured to increase an opening of the EGR valve as the difference increases in a case where the change amount of the parameter indicating the combustion state is less than the target value, decrease the opening of the EGR valve as the difference increases in a case where the change amount of the parameter indicating the combustion state is more than the target value, calculate a combustion center position based on the parameter indicating the combustion state, advance an ignition timing in a case where an average value of the combustion center positions is out of a predetermined range, and increase discharge energy generated in an ignition device in a case where the average value of the combustion center position is within the predetermined range and the change amount of the parameter indicating the combustion state is more than the target value. ### Claim 7 (depends on 6) The control device for the internal combustion engine according to claim 6, wherein the parameter indicating the combustion state is an index having a correlation with a combustion ratio of the air-fuel mixture, a crank angle at which the combustion ratio of the air-fuel mixture takes a predetermined value, a maximum value of an in-cylinder pressure, or a crank angle at which the in-cylinder pressure is maximum. ### Claim 8 (depends on 6) The control device for the internal combustion engine according to claim 6, wherein the processor is configured to estimate an in-cylinder pressure of the internal combustion engine based on a crank angular velocity at a first timing after an ignition timing and a crank angular velocity at a second timing before an exhaust valve is opened, and estimate the combustion center position by using the estimated in-cylinder pressure, or estimate the combustion center position by using an in-cylinder pressure detected by a sensor. ### Claim 9 (depends on 6) The control device for the internal combustion engine according to claim 6, wherein the processor is configured to correct the operation amount of the actuator in a case where an intake system state is a steady state, a traveling state is a constant speed state, or the traveling state is a constant acceleration state. ### Claim 10 (depends on 6) The control device for the internal combustion engine according to claim 6, wherein the change amount is a deviation indicating a difference from a reference value, and the reference value is a value of the parameter indicating the combustion state in a previous combustion cycle.