# US 2018/0320627 A1 · Estimation device and control device for combustion system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320627 A1 - Document ID: US20180320627A1 - Status: Published application - Kind: A1 - Application number: 15/773,590 - Filed: 2016-09-13 - Published: 2018-11-08 - Earliest claimed: 2015-11-12 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Shinya HOSHI; Atsunori OKABAYASHI - Web page: https://patentgrep.com/patent/US20180320627A1 ## CPC - F02D 41/38: of the high pressure type - F02D 19/00: Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures (the non-fuel substances being gaseous F02D21/00) - F02D 19/0636: {by estimation, i.e. without using direct measurements of a corresponding sensor} - F02D 35/02: on interior conditions - F02D 41/047: {Taking into account fuel evaporation or wall wetting; (special correction after fuel cut-off F02D41/126)} - F02D 41/401: {Controlling injection timing (F02D41/402 takes precedence)} - F02D 41/405: {with post injections} - F02D 2041/1433: {using a model or simulation of the system} - F02D 2200/0602: Fuel pressure - F02D 2200/0612: determined by estimation - F02D 2200/0616: determined by estimation - F02D 2200/0802: Temperature of the exhaust gas treatment apparatus - Y02T 10/30: Use of alternative fuels, e.g. biofuels - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An estimation device is applicable to a combustion system including an internal combustion engine and includes a mixing acquisition unit, a main region estimation unit, and an after region estimation unit. The mixing acquisition unit acquires a mixing ratio of various components contained in the fuel used for combustion in the internal combustion engine. The main region estimation unit estimates a combustion region of the fuel as a main combustion region for a main combustion produced by injecting the fuel into a combustion chamber of the internal combustion engine by main injection, based on the mixing ratio acquired by the mixing acquisition unit. The after region estimation unit estimates an injection region of the fuel as the after combustion region based on the mixing ratio, for an after combustion produced by injecting the fuel into the combustion chamber by an after injection, after the main injection in one combustion cycle. ## Claims ### Claim 1 An estimation device applicable to a combustion system including an internal combustion engine, the estimation device comprising: a mixing acquisition unit to acquire a mixing ratio of various components contained in a fuel used for combustion in the internal combustion engine; a main region estimation unit to estimate a combustion region of the fuel as a main combustion region for a main combustion produced by injecting the fuel into a combustion chamber of the internal combustion engine by a main injection, based on the mixing ratio acquired by the mixing acquisition unit; and an after region estimation unit to estimate an injection region of the fuel as the after combustion region based on the mixing ratio, for an after combustion produced by injecting the fuel into the combustion chamber by an after injection, after the main injection in one combustion cycle. ### Claim 2 (depends on 1) The estimation device for the combustion system according to claim 1, further comprising: at least one of a main injection amount estimation unit to estimate an injection amount caused by the main injection, based on the mixing ratio, a main heat-generation amount estimation unit to estimate a heat generation amount of the fuel caused by the main combustion, based on the mixing ratio, a main penetration force estimation unit to estimate a penetration force of the fuel caused by the main injection, based on the mixing ratio, or a main diffusion estimation unit to estimate a diffusion state of the fuel caused by the main injection, based on the mixing ratio, wherein the main region estimation unit is to estimate the main combustion region based on least one of the injection amount, the heat generation amount, the penetration force, or the diffusion state, for the main injection. ### Claim 3 (depends on 1) The estimation device for the combustion system according to claim 1, further comprising: at least one of an after injection amount estimation unit to estimate an injection amount caused by the after injection, based on the mixing ratio, an after heat-generation amount estimation unit to estimate a heat generation amount of the fuel caused by the after combustion, based on the mixing ratio, an after penetration force estimation unit to estimate a penetration force of the fuel caused by the after injection, based on the mixing ratio, or an after diffusion estimation unit to estimate a diffusion state of the fuel caused by the after injection, based on the mixing ratio, wherein the after region estimation unit is to estimate the after combustion region based on at least one of the injection amount, the heat generation amount, the penetration force, or the diffusion state, for the after injection. ### Claim 4 (depends on 1) The estimation device for the combustion system according to claim 1, further comprising: a coordinate setting unit to set a fuel coordinate system for acquiring positions of the main combustion region and the after combustion region, based on the mixing ratio; a main position acquisition unit to acquire a representation position of the main combustion region that is predetermined, for the fuel coordinate system set by the coordinate setting unit; and an after position acquisition unit to acquire a representation position of the after combustion region that is predetermined, for the fuel coordinate system. ### Claim 5 (depends on 4) The estimation device for the combustion system according to claim 4, further comprising: a distance acquisition unit to acquire a separation distance between (i) the representation position of the main combustion region acquired by the main position acquisition unit and (ii) the representation position of the after combustion region acquired by the after position acquisition unit, in the fuel coordinate system. ### Claim 6 (depends on 4) The estimation device for the combustion system according to claim 4, wherein the main position acquisition unit is to acquire the representation position of the main combustion region at a first timing that a predetermined time has elapsed since a start of the main injection, the predetermined time is previously set, and the after position acquisition unit is to acquire the representation position of the after combustion region at a second timing that the predetermined time has elapsed since a start of the after injection. ### Claim 7 An estimation device applicable to a combustion system including an internal combustion engine, the estimation device comprising: a mixing acquisition unit to acquire a mixing ratio of various components contained in the fuel used for combustion in the internal combustion engine; a main penetration force estimation unit to estimate a penetration force of the fuel injected into a combustion chamber of the internal combustion engine by a main injection, based on the mixing ratio acquired by the mixing acquisition unit; and an after penetration force estimation unit to estimate a penetration force of the fuel injected into the combustion chamber by the after injection, based on the mixing ratio, after the main injection in one combustion cycle. ### Claim 8 A control device applicable to a combustion system including an internal combustion engine, the control device comprising: a mixing acquisition unit to acquire a mixing ratio of various components contained in a fuel used for combustion in the internal combustion engine; a main region estimation unit to estimate a combustion region of the fuel as a main combustion region for a main combustion produced by injecting the fuel into a combustion chamber of the internal combustion engine by a main injection, based on the mixing ratio acquired by the mixing acquisition unit; an after region estimation unit to estimate an injection region of the fuel as the after combustion region based on the mixing ratio, for an after combustion produced by injecting the fuel into the combustion chamber by an after injection, after the main injection in one combustion cycle; and a combustion control unit to control the combustion system based on respective estimation results of the main region estimation unit and the after region estimation unit. ### Claim 9 (depends on 8) The control device for the combustion system according to claim 8, wherein the combustion control unit is to control the combustion system based on the respective estimation results of the main region estimation unit and the after region estimation unit and further based on the mixing ratio.