# US 2018/0320628 A1 · Combustion system estimation device and control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320628 A1 - Document ID: US20180320628A1 - Status: Published application - Kind: A1 - Application number: 15/773,604 - Filed: 2016-09-13 - Published: 2018-11-08 - Earliest claimed: 2015-11-12 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Atsunori OKABAYASHI; Shinya HOSHI - Web page: https://patentgrep.com/patent/US20180320628A1 ## CPC - F02D 41/3827: {for diesel engines} - F02D 19/0631: {by estimation, i.e. without using direct measurements of a corresponding sensor} - F02D 19/0636: {by estimation, i.e. without using direct measurements of a corresponding sensor} - F02D 35/02: on interior conditions - F02D 35/028: {by determining the combustion timing or phasing} - F02D 41/0025: {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures} - F02D 41/047: {Taking into account fuel evaporation or wall wetting; (special correction after fuel cut-off F02D41/126)} - F02D 41/3872: {characterised by leakage flow in injectors} - F02D 41/405: {with post injections} - F02D 45/00: Electrical control not provided for in groups F02D41/00 - F02D43/00 - F02D 41/005: {according to engine operating conditions} - F02D 2041/001: {for engines with variable valve actuation} - 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 applicable to a combustion system having an internal combustion engine includes a mixing acquisition unit, a combustion amount estimation unit, a region estimation unit, and a timing estimation unit. The mixing acquisition unit acquires a mixing ratio of various components contained in fuel used for combustion in the internal combustion engine. The combustion amount estimation unit estimates a combustion amount of fuel caused by a post combustion generated by injecting fuel into a combustion chamber of the internal combustion engine by post injection, based on the mixing ratio acquired by the mixing acquisition unit. The region estimation unit estimates a combustion region of the post combustion in the combustion chamber based on the mixing ratio. The timing estimation unit estimates an ignition timing at which ignition occurs in the combustion chamber by the post injection based on the mixing ratio. ## Claims ### Claim 1 An estimation device applicable to a combustion system having an internal combustion engine, 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 combustion amount estimation unit to estimate a combustion amount of the fuel caused by a post-combustion generated by injecting the fuel into a combustion chamber of the internal combustion engine by post injection, based on the mixing ratio acquired by the mixing acquisition unit; a region estimation unit to estimate a combustion region of the post combustion in the combustion chamber based on the mixing ratio; and a timing estimation unit to estimate an ignition timing, at which ignition occurs in the combustion chamber with the post injection, based on the mixing ratio. ### Claim 2 (depends on 1) The estimation device for the combustion system according to claim 1, further comprising at least one of: an injection amount estimation unit to estimate the injection amount by the post injection based on the mixing ratio; a heat generation amount estimation unit to estimate the amount of heat generation of fuel in the post combustion based on the mixing ratio; a penetration force estimation unit to estimate a penetration force of fuel by the post injection based on the mixing ratio; a diffusion estimation unit to estimate a diffusion state of fuel by the post injection based on the mixing ratio; and an ignition delay estimation unit to estimate an ignition delay characteristic as ease of ignition of fuel based on the mixing ratio, wherein the combustion amount estimation unit, the region estimation unit, and the timing estimation unit are to estimate the combustion amount, the combustion region, and the ignition timing, based on at least one of the injection amount, the heat generation amount, the penetration force, the diffusion state, and the ignition delay characteristic. ### Claim 3 (depends on 2) The estimation device for the combustion system according to claim 2, wherein the combustion amount estimation unit is to estimate the combustion amount based on the injection amount, the heat generation amount, the penetration force, the diffusion state, and the ignition delay characteristic. ### Claim 4 (depends on 2) The estimation device for the combustion system according to claim 2, wherein the region estimation unit is to estimate the combustion region based on the injection amount, the penetration force, the diffusion state, and the ignition delay characteristic among the injection amount, the heat generation amount, the penetration force, the diffusion state, and the ignition delay characteristic. ### Claim 5 (depends on 2) The estimation device for the combustion system according to claim 2, wherein the timing estimation unit is to estimate the ignition timing based on the injection amount, the diffusion state, and the ignition delay characteristic among the injection amount, the heat generation amount, the penetration force, the diffusion state, and the ignition delay characteristic. ### Claim 6 (depends on 2) The estimation device for the combustion system according to claim 2, further comprising: an OH radical estimation unit to estimate an OH radical generation state as an OH radical distribution based on the mixing ratio, in a case where an internal temperature of the combustion chamber is in a temperature range where the post injection is performed, wherein the timing estimation unit is to estimate the ignition timing based on the OH radical distribution estimated with the OH radical estimation unit in addition to at least one of the injection amount, the heat generation amount, the penetration force, the diffusion state, and the ignition delay characteristic. ### Claim 7 (depends on 6) The estimation device for the combustion system according to claim 6, further comprising: a temperature acquisition unit to acquire an internal temperature of the combustion chamber; and an oxygen acquisition unit to acquire an oxygen concentration in the combustion chamber, wherein the OH radical estimation unit is to estimate the OH radical distribution based on the internal temperature acquired with the temperature acquisition unit and the oxygen concentration acquired with the oxygen acquisition unit, in addition to the mixing ratio. ### Claim 8 A control device applicable to a combustion system having an internal combustion engine, comprising: a mixing acquisition unit to acquire a mixing ratio of various components contained in fuel used for combustion in the internal combustion engine; a combustion amount estimation unit to estimate a combustion amount of the fuel caused by a post-combustion generated by injecting the fuel into a combustion chamber of the internal combustion engine by post injection, based on the mixing ratio acquired by the mixing acquisition unit; a region estimation unit to estimate a combustion region of the post combustion in the combustion chamber based on the mixing ratio; a timing estimation unit to estimate an ignition timing, at which ignition occurs in the combustion chamber by the post injection, based on the mixing ratio; and a combustion control unit to control the combustion system based on respective estimation results of the combustion amount estimation unit, the region estimation unit, and the timing estimation unit. ### Claim 9 (depends on 8) The control device for the combustion system according to claim 8, wherein the combustion control unit controls the combustion system based on the mixing ratio in addition to the respective estimation results of the combustion amount estimation unit, the region estimation unit, and the timing estimation unit.