# US 8,739,760 B2 · Control system of an 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 8,739,760 B2 - Document ID: US8739760B2 - Status: Granted - Kind: B2 - Application number: 13/262,705 - Filed: 2010-04-02 - Published: 2012-02-02 - Granted: 2014-06-03 - Earliest claimed: 2009-04-02 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Hiroyuki Hokuto; Tomohiro Shinagawa; Nobuyuki Satake - Inventors: Hiroyuki Hokuto; Tomohiro Shinagawa; Nobuyuki Satake - Web page: https://patentgrep.com/patent/US8739760B2 ## CPC - F02D 41/402: {Multiple injections} - F02D 11/10: of the electric type - F02D 41/0047: {Controlling exhaust gas recirculation [EGR] (temperature control with cooler in recirculation circuit F02M26/33)} - F02D 41/0057: {Specific combustion modes (combustion modes per se F02D41/3017)} - F02D 41/0072: {Estimating, calculating or determining the EGR rate, amount or flow (sensors in EGR systems F02M26/45)} - F02D 41/182: {for the control of a fuel injection device} - F02D 41/3094: {the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder} - F02M 26/64: the EGR valve being operated together with an intake air throttle - F02B 23/104: {the injector being placed on a side position of the cylinder} - F02M 69/046: {for injecting into both the combustion chamber and the intake conduit} - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control system of an internal combustion engine provided with a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine, a second fuel injection valve that injects fuel into an intake port of the internal combustion engine, an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to an intake passage thereof, an EGR valve that is arranged in the EGR passage, and an obtaining unit that obtains an amount of intake air in the internal combustion engine. When the EGR valve is open, a determination is made as to whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, and a value of the amount of intake air thus obtained is corrected based on the determination. ## Claims ### Claim 1 A control system of an internal combustion engine comprising: a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine; a second fuel injection valve that injects fuel into an intake port of the internal combustion engine; a throttle valve that is arranged in an intake passage of the internal combustion engine; an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to the intake passage at a location downstream of said throttle valve; an EGR valve that is arranged in the EGR passage; an obtaining unit that obtains an amount of intake air in the internal combustion engine; a determination unit that determines, based on a cylinder injection ratio which is a ratio of an amount of fuel injected from said first fuel injection valve to a total amount of fuel injected from said first fuel injection valve and said second fuel injection valve, whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, when said EGR valve is open; and a correction unit that corrects the amount of intake air obtained by said obtaining unit, according to a result of the determination of said determination unit. ### Claim 2 (depends on 1) The control system of an internal combustion engine according to claim 1, wherein if the cylinder injection ratio is lower than a specific ratio when a degree of opening of said throttle valve is not more than a predetermined throttle opening degree and when a degree of opening of said EGR valve is not less than a predetermined EGR valve opening degree, said determination unit makes a determination that the amount of intake air is in the decreasing tendency with respect to an increase in the cylinder injection ratio. ### Claim 3 (depends on 1) The control system of an internal combustion engine according to claim 1, wherein if the cylinder injection ratio is not less than a specific ratio when a degree of opening of said throttle valve is not more than a predetermined throttle opening degree and when a degree of opening of said EGR valve is not less than a predetermined EGR valve opening degree, said determination unit makes a determination that the amount of intake air is in the increasing tendency with respect to an increase in the cylinder injection ratio. ### Claim 4 (depends on 1) The control system of an internal combustion engine according to claim 1, further comprising: a storage unit that stores an operating range in which the increasing or decreasing tendency of the amount of intake air with respect to a change in the cylinder injection ratio is reversed at a specific cylinder injection ratio; wherein when the operating state of said internal combustion engine falls within the operating range stored in said storage unit, said determination unit determines whether the amount of intake air is in the increasing tendency or in the decreasing tendency, by making a determination as to whether the cylinder injection ratio is lower than the specific cylinder injection ratio. ### Claim 5 (depends on 1) The control system of an internal combustion engine according to claim 1, further comprising: a changing unit that changes a target value of a control parameter related to the operating state of said internal combustion engine, according to the amount of intake air corrected by said correction unit. ### Claim 6 (depends on 5) The control system of an internal combustion engine according to claim 5, wherein said control parameter is at least one of a degree of opening of said throttle valve, a degree of opening of said EGR valve, said total amount of fuel, said cylinder injection ratio, ignition timing, and a valve opening characteristic of an intake valve. ### Claim 7 A control system of an internal combustion engine comprising: a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine; a second fuel injection valve that injects fuel into an intake port of the internal combustion engine; a throttle valve that is arranged in an intake passage of the internal combustion engine; an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to the intake passage at a location downstream of said throttle valve; an EGR valve that is arranged in the EGR passage; an obtaining unit that obtains an amount of intake air in the internal combustion engine; a setting unit that sets a target value of a control parameter related to an operating state of said internal combustion engine, according to the amount of intake air obtained by said obtaining unit; a determination unit that determines, based on a cylinder injection ratio which is a ratio of an amount of fuel injected from said first fuel injection valve to a total amount of fuel injected from said first fuel injection valve and said second fuel injection valve, whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, when said EGR valve is open; and a correction unit that corrects the target value of the control parameter set by said setting unit, according to a result of the determination of said determination unit. ### Claim 8 (depends on 7) The control system of an internal combustion engine according to claim 7, wherein if the cylinder injection ratio is lower than a specific ratio when a degree of opening of said throttle valve is not more than a predetermined throttle opening degree and when a degree of opening of said EGR valve is not less than a predetermined EGR valve opening degree, said determination unit makes a determination that the amount of intake air is in the decreasing tendency with respect to an increase in the cylinder injection ratio. ### Claim 9 (depends on 7) The control system of an internal combustion engine according to claim 7, wherein if the cylinder injection ratio is not less than a specific ratio when a degree of opening of said throttle valve is not more than a predetermined throttle opening degree and when a degree of opening of said EGR valve is not less than a predetermined EGR valve opening degree, said determination unit makes a determination that the amount of intake air is in the increasing tendency with respect to an increase in the cylinder injection ratio. ### Claim 10 (depends on 7) The control system of an internal combustion engine according to claim 7, further comprising: a storage unit that stores an operating range in which the increasing or decreasing tendency of the amount of intake air with respect to a change in the cylinder injection ratio is reversed at a specific cylinder injection ratio; wherein when the operating state of said internal combustion engine falls within the operating range stored in said storage unit, said determination unit determines whether the amount of intake air is in the increasing tendency or in the decreasing tendency, by making a determination as to whether the cylinder injection ratio is lower than the specific cylinder injection ratio. ### Claim 11 A control system of an internal combustion engine comprising: a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine; a second fuel injection valve that injects fuel into an intake port of the internal combustion engine; a throttle valve that is arranged in an intake passage of the internal combustion engine; an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to the intake passage at a location downstream of said throttle valve; an EGR valve that is arranged in the EGR passage; a first obtaining unit that obtains an amount of intake air in the internal combustion engine; a second obtaining unit that obtains an amount of EGR gas based on the amount of intake air obtained by said first obtaining unit; a determination unit that determines, based on a cylinder injection ratio which is a ratio of an amount of fuel injected from said first fuel injection valve to a total amount of fuel injected from said first fuel injection valve and said second fuel injection valve, whether the amount of EGR gas is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, when said EGR valve is open; and a correction unit that corrects the amount of EGR gas obtained by said second obtaining unit, according to a result of the determination of said determination unit.