# US 11,078,861 B2 · Fuel injection control device and fuel injection control method 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 11,078,861 B2 - Document ID: US11078861B2 - Status: Granted - Kind: B2 - Application number: 17/048,499 - Filed: 2019-03-12 - Published: 2021-02-11 - Granted: 2021-08-03 - Earliest claimed: 2018-04-19 - Assignees: Hitachi Astemo, Ltd. - Applicants: Hitachi Astemo, Ltd. - Inventors: Kohsuke Kanda; Atsushi Murai; Yoshitatsu Nakamura - Web page: https://patentgrep.com/patent/US11078861B2 ## CPC - F02D 41/182: {for the control of a fuel injection device} - F02D 13/06: Cutting-out cylinders - F02D 41/107: {and deceleration} - F02D 41/34: with means for controlling injection timing or duration - F02D 2200/04: Engine intake system parameters - F02D 2200/0404: Throttle position - F02D 2200/0602: Fuel pressure - F02D 2200/101: Engine speed - F02D 2200/602: Pedal position - 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 The fuel injection control device and fuel injection control method according to the present invention allow a fuel injection device to perform fuel injection in the case where an open period of the intake valve and an open period of the exhaust valve overlap with each other, and sets the timing to start injection to the closing timing of the exhaust valve, and that sets the timing to end injection to the timing at which a deceleration rate of intake air speed becomes the local maximum. As such, the homogeneity of in-cylinder air-fuel mixture can be improved while preventing the adhesion of fuel to the inner wall of the intake port and the blow-through of fuel to the exhaust passage from occurring. ## Claims ### Claim 1 A fuel injection control device for an internal combustion engine which has a fuel injection device arranged in an intake pipe that is located upstream of an intake valve, the fuel injection control device comprising: an injection period control unit that lets the fuel injection device perform fuel injection, with a cylinder that has an open period of the intake valve and an open period of an exhaust valve overlap with each other, and that sets a timing to start injection to a closing timing of an exhaust valve and a timing to end injection to a timing at which a deceleration rate of intake air speed becomes a local maximum. ### Claim 2 (depends on 1) The fuel injection control device for the internal combustion engine according to claim 1, wherein the injection period control unit adjusts a pressure of fuel supplied to the fuel injection device to variably control an amount of fuel that is injected by the fuel injection device. ### Claim 3 (depends on 2) The fuel injection control device for the internal combustion engine according to claim 2, wherein the injection period control unit, when reducing the pressure of fuel supplied to the fuel injection device, temporarily changes the period of fuel injection by the fuel injection device to be shorter within a period from the closing timing of the exhaust valve to the timing at which the deceleration rate of the intake air speed becomes the local maximum than before reducing the pressure. ### Claim 4 (depends on 3) The fuel injection control device for the internal combustion engine according to claim 3, wherein as the decrease in the pressure of the fuel supplied to the fuel injection device is greater, the injection period control unit changes the period of fuel injection by the fuel injection device to be shorter. ### Claim 5 (depends on 3) The fuel injection control device for the internal combustion engine according to claim 3, wherein the intake pipe includes a first intake port and a second intake port for each cylinder, the fuel injection device includes a first fuel injection valve that is arranged in the first intake port and a second fuel injection valve that is arranged in the second intake port, and when the injection period control unit temporarily changes the period of fuel injection by the first fuel injection valve and the period of fuel injection by the second fuel injection valve to be short, the injection period control unit shifts a phase of the period of fuel injection by the first fuel injection valve and a phase of the period of fuel injection of the second fuel injection valve. ### Claim 6 (depends on 5) The fuel injection control device for the internal combustion engine according to claim 5, wherein when the injection period control unit temporarily changes the period of fuel injection by the first fuel injection valve and the period of fuel injection by the second fuel injection valve to be short, the injection period control unit sets the timing to start injection by the first fuel injection valve to the closing timing of the exhaust valve, and sets the timing to end injection by the first fuel injection valve before the timing at which the deceleration rate of the intake air speed becomes the local maximum, and the injection period control unit sets the timing to end injection by the second fuel injection valve to the timing at which the deceleration rate of the intake air speed becomes the local maximum, and sets the timing to start injection by the second fuel injection valve after the closing timing of the exhaust valve. ### Claim 7 (depends on 2) The fuel injection control device for the internal combustion engine according to claim 2, wherein when the injection period control unit increases the pressure of fuel in an accelerating state of the internal combustion engine, as the increase in the pressure of the fuel is greater, the injection period control unit controls the response speed of the intake air amount of the internal combustion engine to be accordingly slower. ### Claim 8 (depends on 1) The fuel injection control device for the internal combustion engine according to claim 1, wherein the fuel injection device comprises means for promoting atomization of fuel. ### Claim 9 (depends on 1) The fuel injection control device for the internal combustion engine according to claim 1, wherein the injection period control unit obtains the timing at which the deceleration rate of the intake air speed reaches the local maximum based on an operation state of the internal combustion engine. ### Claim 10 A fuel injection control method for an internal combustion engine which has a fuel injection device arranged in an intake pipe that is located upstream of an intake valve, the method comprising the step of: performing fuel injection by the fuel injection device with a cylinder that has an open period of the intake valve and an open period of an exhaust valve overlap, that sets a timing to start injection to a closing timing of the exhaust valve and a timing to end injection to a timing at which a deceleration rate of intake air speed becomes a local maximum. ### Claim 11 (depends on 10) The fuel injection control method for the internal combustion engine according to claim 10, further comprising the steps of: adjusting a pressure of fuel supplied to the fuel injection device to variably control an amount of fuel that is injected by the fuel injection device, and when reducing the pressure of fuel supplied to the fuel injection device, temporarily changing the period of fuel injection by the fuel injection device to be shorter within a period from the closing timing of the exhaust valve to the timing at which the deceleration rate of the intake air speed becomes the local maximum than before reducing the pressure.