# US 10,480,435 B2 · EGR and reformate fraction estimation in a dedicated EGR engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,435 B2 - Document ID: US10480435B2 - Status: Granted - Kind: B2 - Application number: 15/927,467 - Filed: 2018-03-21 - Published: 2019-09-26 - Granted: 2019-11-19 - Earliest claimed: 2018-03-21 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Jun-mo Kang; Gregory P. Matthews; Martino A. Casetti - Web page: https://patentgrep.com/patent/US10480435B2 ## CPC - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - F02D 41/0082: {per groups or banks (F02D41/0087 takes precedence)} - F02D 41/0072: {Estimating, calculating or determining the EGR rate, amount or flow (sensors in EGR systems F02M26/45)} - 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 41/008: {Controlling each cylinder individually} - F02D 41/0235: {in relation with the state of the exhaust gas treating apparatus (control of exhaust gas treating apparatus per se F01N)} - F02D 41/1444: {characterised by the characteristics of the combustion gases} - F02D 41/1458: {with determination means using an estimation} - F02D 41/2416: {Interpolation techniques} - F02M 26/43: in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine - F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} - F02D 13/0215: {changing the valve timing only} - F02D 41/0002: {Controlling intake air} - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/30: Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} - F02D 2041/1416: {Observer} - F02P 5/04: automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions (dependent on position of personal controls of engine F02P5/02) - F02P 5/1516: {with means relating to exhaust gas recirculation, e.g. turbo} - F02P 5/1522: {with particular means concerning an individual cylinder} - 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) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - 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 A method of operating a dedicated-EGR engine includes providing a rich air-fuel mixture to a dedicated cylinder; combusting the rich air-fuel mixture in the dedicated cylinder; modeling the combustion of the rich air-fuel mixture in the dedicated cylinder; estimating the composition of the combustion products in the dedicated cylinder based on interpolation of chemical reaction models of stoichiometric and rich combustion. The method further includes mixing the combustion products from the dedicated cylinder with air to produce an intake mixture; estimating a mass fraction of reformate and a mass fraction of burned gas in the intake mixture; providing the intake mixture to the intake ports of all of the cylinders of the dedicated-EGR engine; combusting an air-fuel mixture in a non-dedicated cylinder of the engine; and controlling an engine control parameter based on the estimated mass fractions of reformate and burned gas in the intake mixture. ## Claims ### Claim 1 A method of operating a dedicated-EGR engine, comprising the steps of: providing a rich air-fuel mixture to a dedicated cylinder; combusting the rich air-fuel mixture in the dedicated cylinder; modeling the combustion of the rich air-fuel mixture in the dedicated cylinder; estimating a composition of combustion products in the dedicated cylinder based on interpolation of chemical reaction models of stoichiometric and rich combustion; mixing the combustion products from the dedicated cylinder with air to produce an intake mixture; estimating a mass fraction of reformate in the intake mixture; estimating a mass fraction of burned gas in the intake mixture; providing the intake mixture to intake ports of all of the cylinders of the dedicated-EGR engine; combusting an air-fuel mixture in a non-dedicated cylinder of the engine; controlling an engine control parameter effective to influence combustion in the non-dedicated cylinder, wherein a value to which the engine control parameter is controlled is determined based on the estimated mass fraction of reformate and the estimated mass fraction of burned gas in the intake mixture. ### Claim 2 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling fuel injection timing. ### Claim 3 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling fuel injection quantity. ### Claim 4 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling spark timing. ### Claim 5 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling throttle position. ### Claim 6 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling an EGR bypass valve. ### Claim 7 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling a turbocharger waste gate. ### Claim 8 (depends on 1) The method of claim 1, wherein the step of controlling the engine control parameter comprises controlling engine intake valve timing or engine exhaust valve timing. ### Claim 9 (depends on 1) The method of claim 1, wherein the air-fuel mixture in the non-dedicated cylinder is adjusted to achieve overall stoichiometry at a catalytic converter disposed downstream of the non-dedicated cylinder. ### Claim 10 A system comprising a dedicated-EGR engine; and a controller configured to: control provision of a rich air-fuel mixture to a dedicated cylinder; control combustion of the rich air-fuel mixture in the dedicated cylinder; model the combustion of the rich air-fuel mixture in the dedicated cylinder; estimate a composition of combustion products in the dedicated cylinder based on interpolation of chemical reaction models of stoichiometric and rich combustion; estimate a mass fraction of reformate in an intake mixture comprising combustion products from the dedicated cylinder and air; estimate a mass fraction of burned gas in the intake mixture; control provision of the intake mixture to intake ports of all of the cylinders of the dedicated-EGR engine; control combustion of an air-fuel mixture in a non-dedicated cylinder of the engine; control an engine control parameter effective to influence combustion in the non-dedicated cylinder, wherein a value to which the engine control parameter is controlled is determined based on the estimated mass fraction of reformate and the estimated mass fraction of burned gas in the intake mixture. ### Claim 11 (depends on 10) The system of claim 10, wherein the engine control parameter is fuel injection timing. ### Claim 12 (depends on 10) The system of claim 10, wherein the engine control parameter is fuel injection quantity. ### Claim 13 (depends on 10) The system of claim 10, wherein the engine control parameter is spark timing. ### Claim 14 (depends on 10) The system of claim 10, wherein the engine control parameter is throttle position. ### Claim 15 (depends on 10) The system of claim 10, wherein the engine control parameter is EGR bypass valve position. ### Claim 16 (depends on 10) The system of claim 10, wherein the engine control parameter is turbocharger waste gate position. ### Claim 17 (depends on 10) The system of claim 10, wherein the engine control parameter is at least one of engine intake valve timing and engine exhaust valve timing. ### Claim 18 A controller comprising a processor and a non-transitory computer-readable medium containing instructions that, when executed, perform the method comprising the steps of: controlling provision of a rich air-fuel mixture to a dedicated cylinder; controlling combustion of the rich air-fuel mixture in the dedicated cylinder; modeling the combustion of the rich air-fuel mixture in the dedicated cylinder; estimating a composition of combustion products in the dedicated cylinder based on interpolation of chemical reaction models of stoichiometric and rich combustion; estimating a mass fraction of reformate in an intake mixture comprising the combustion products from the dedicated cylinder and air; estimating a mass fraction of burned gas in the intake mixture; controlling provision of the intake mixture to intake ports of all of the cylinders of the dedicated-EGR engine; controlling combustion of an air-fuel mixture in a non-dedicated cylinder of the engine; and controlling an engine control parameter effective to influence combustion in the non-dedicated cylinder, wherein a value to which the engine control parameter is controlled is determined based on the estimated mass fraction of reformate and the estimated mass fraction of burned gas in the intake mixture. ### Claim 19 (depends on 18) The controller of claim 18, wherein the engine control parameter is selected from the group consisting of fuel injection timing, fuel injection quantity, spark timing, throttle position, EGR bypass valve position, turbocharger waste gate position, engine intake valve timing, and engine exhaust valve timing.