# US 10,767,604 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 10,767,604 B2 - Document ID: US10767604B2 - Status: Granted - Kind: B2 - Application number: 16/173,032 - Filed: 2018-10-29 - Published: 2019-07-04 - Granted: 2020-09-08 - Earliest claimed: 2017-12-29 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Akinori Morishima - Web page: https://patentgrep.com/patent/US10767604B2 ## CPC - F02M 26/25: with coolers having bypasses - F02D 41/005: {according to engine operating conditions} - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - F02D 41/0072: {Estimating, calculating or determining the EGR rate, amount or flow (sensors in EGR systems F02M26/45)} - F02D 41/1445: {the characteristics being related to the exhaust flow} - F02D 41/1448: {the characteristics being an exhaust gas pressure} - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - F02M 26/06: Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor - F02M 26/28: with liquid-cooled heat exchangers - F02M 26/33: controlling the temperature of the recirculated gases - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02M 26/08: for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor - F02M 26/35: with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters - F02M 26/47: the characteristics being temperatures, pressures or flow rates - Y02T 10/40: Engine management systems - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a control device for an internal combustion engine that includes an EGR device equipped with an EGR cooler bypass passage and a flow-rate-ratio control valve equipped with a valve disc and capable of controlling a flow rate ratio. The control device is configured, when an opening degree control execution condition is met, to execute a vibration reduction control for controlling the flow-rate-ratio control valve such that the opening degree of the valve disc becomes greater than or equal to a vibration reduction opening degree that is greater than a minimum opening degree within an opening degree control range of the valve disc. The opening degree control execution condition includes a requirement that a parameter (pulsation level value) that becomes greater when exhaust pulsation acting on the valve disc is greater is equal to or greater than a first threshold value. ## Claims ### Claim 1 A control device for an internal combustion engine, the internal combustion engine including an EGR device that includes: an EGR passage configured to connect an intake air passage of the internal combustion engine with an exhaust gas passage thereof; an EGR cooler arranged at the EGR passage; an EGR cooler bypass passage through which, when at least a part of EGR gas flowing through the EGR passage bypasses the EGR cooler, the at least a part of EGR gas flows; and a flow-rate-ratio control valve equipped with a valve disc and capable of controlling, by adjustment of an opening degree of the valve disc, a flow rate ratio of a flow rate of a cooler passing-through gas that is an EGR gas flowing through the EGR cooler and a flow rate of a bypass passing-through gas that is an EGR gas flowing through the EGR cooler bypass passage, wherein the control device is configured, when an opening degree control execution condition is met, to execute a vibration reduction control for controlling the flow-rate-ratio control valve such that the opening degree of the valve disc becomes greater than or equal to a vibration reduction opening degree that is greater than a minimum opening degree within an opening degree control range of the valve disc, and wherein the opening degree control execution condition includes a requirement that a parameter that becomes greater when exhaust pulsation acting on the valve disc is greater is equal to or greater than a first threshold value. ### Claim 2 (depends on 1) The control device according to claim 1, wherein the EGR device includes an EGR valve arranged in a portion of the EGR passage located on a downstream side of a collective portion between the cooler passing-through gas and the bypass passing-through gas, and wherein the opening degree control execution condition includes a requirement that an opening degree of the EGR valve is equal to or smaller than a second threshold value in addition to the requirement that the parameter is equal to or greater than the first threshold value. ### Claim 3 (depends on 2) The control device according to claim 2, wherein, in comparison under a same engine operating condition, when the opening degree of the EGR valve is smaller, the vibration reduction opening degree is greater than when the opening degree of the EGR valve is greater. ### Claim 4 (depends on 1) The control device according to claim 1, wherein, when the parameter is greater, the vibration reduction opening degree is greater than when the parameter is smaller. ### Claim 5 (depends on 1) The control device according to claim 1, wherein the control device is configured to execute a temperature control for controlling the flow-rate-ratio control valve such that its target opening degree required to cause a temperature of the EGR gas introduced into the intake air passage from the EGR passage to approach a target EGR gas temperature is achieved, and wherein, when the opening degree control execution condition is met during the temperature control, the vibration reduction control controls the flow-rate-ratio control valve such that the opening degree of the valve disc approaches a greater opening degree of the target opening degree and the vibration reduction opening degree. ### Claim 6 (depends on 1) The control device according to claim 1, wherein the vibration reduction opening degree is greater than a maximum value of opening degrees at which chattering of the valve disc occurs.