# US 2022/0034278 A1 · Injection control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0034278 A1 - Document ID: US20220034278A1 - Status: Published application - Kind: A1 - Application number: 17/386,201 - Filed: 2021-07-27 - Published: 2022-02-03 - Earliest claimed: 2020-07-29 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Minori KANEDA; Yohei SUGANUMA; Akira TACHIKI - Web page: https://patentgrep.com/patent/US20220034278A1 ## CPC - F02D 41/20: Output circuits, e.g. for controlling currents in command coils - F02D 41/401: {Controlling injection timing (F02D41/402 takes precedence)} - F02D 41/22: Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} - F02D 41/221: {relating to the failure of actuators or electrically driven elements} - F02D 41/402: {Multiple injections} - F02D 2041/2006: {by using a boost capacitor} - F02D 2041/2058: {using information of the actual current value} - F02D 2041/224: {Diagnosis of the fuel system} - F02D 2041/227: {Limping Home, i.e. taking specific engine control measures at abnormal conditions} - 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 injection control device includes: an instruction output unit outputting an instruction energization time that is an instruction value of an energization time of a fuel injection valve corresponding to a target injection amount; an energization controller controlling energization of the fuel injection valve based on the instruction energization time; an area corrector correcting an area of an electric current flowing through the fuel injection valve when the fuel injection valve is driven by the electric current, calculating a correction time of the energization time, and correcting the instruction energization time; an abnormality determiner determining that an abnormality related to the area correction has occurred when the correction time reaches a predetermined upper limit value; and a normal-return determiner executing, after the abnormality determiner determines that the abnormality related to the area correction has occurred, a normal-return determination at an execution timing of when a degree of influence of the abnormality on an emission becomes equal to or less than a predetermined value, for determining whether or not an abnormal state in which the abnormality related to the area correction has been caused has returned to a normal state. ## Claims ### Claim 1 An injection control device that controls fuel injection by driving a fuel injection valve that supplies fuel to an internal combustion engine with an electric current, the injection control device comprising: an instruction output unit outputting an instruction energization time that is an instruction value of the energization time of the fuel injection valve corresponding to a target injection amount that is a target value of a fuel injection amount of the fuel injection valve; an energization controller controlling energization of the fuel injection valve based on the instruction energization time; an area corrector correcting an area of the electric current flowing through the fuel injection valve when the fuel injection valve is driven by the electric current, calculating a correction time of the energization time, and correcting the instruction energization time; an abnormality determiner determining that an abnormality related to the area correction has occurred when the correction time reaches a predetermined upper limit value; and a normal-return determiner executing, after the abnormality determiner determines that the abnormality related to the area correction has occurred, a normal-return determination at an execution timing of when a degree of influence of the abnormality on an emission becomes equal to or less than a predetermined value, the normal-return determination executed to determine whether or not an abnormal state in which the abnormality related to the area correction has been caused has returned to a normal state. ### Claim 2 (depends on 1) The injection control device of claim 1, wherein the normal-return determiner determines the execution timing of the normal-return determination based on the fuel injection amount and the target injection amount when the correction time reaches the upper limit value. ### Claim 3 (depends on 2) The injection control device of claim 2, wherein the normal-return determiner determines the execution timing of the normal-return determination as a timing of when a ratio of the fuel injection amount against the target injection amount when the correction time reaches the upper limit value is equal to or greater than a predetermined first threshold value. ### Claim 4 (depends on 2) The injection control device of claim 2, wherein the normal-return determiner determines the execution timing of the normal-return determination as a timing of when a difference between the fuel injection amount and the target injection amount when the correction time reaches the upper limit value is equal to or less than a predetermined second threshold value. ### Claim 5 (depends on 2) The injection control device of claim 2, wherein the normal-return determiner determines the execution timing of the normal-return determination as a timing of when a ratio of (i) a difference between the fuel injection amount and the target injection amount against (ii) the target injection amount when the correction time reaches the upper limit value is equal to or less than a predetermined third threshold value. ### Claim 6 (depends on 1) The injection control device of claim 1, wherein the normal-return determiner executes the normal-return determination multiple times, and determines whether or not the abnormal state has returned to the normal state based on determination results of multiple time determinations. ### Claim 7 An injection control device for controlling fuel injection by driving a fuel injection valve that supplies fuel to an internal combustion engine, the injection control device comprising: a processor; and a non-transitory computer-readable storage medium, wherein the injection control device is configured to: output an instruction energization time that is an instruction value of the energization time of the fuel injection valve corresponding to a target injection amount that is a target value of a fuel injection amount of the fuel injection valve; control energization of the fuel injection valve based on the instruction energization time; correct an area of the electric current flowing through the fuel injection valve when the fuel injection valve is driven by the electric current, calculating a correction time of the energization time, and correcting the instruction energization time; determine that an abnormality related to the area correction has occurred when the correction time reaches a predetermined upper limit value; and execute, after the abnormality determiner determines that the abnormality related to the area correction has occurred, a normal-return determination at an execution timing of when a degree of influence of the abnormality on an emission becomes equal to or less than a predetermined value, the normal-return determination executed to determine whether or not an abnormal state in which the abnormality related to the area correction has been caused has returned to a normal state. ### Claim 8 (depends on 7) The injection control device of claim 7, wherein the injection control device is further configured to: determine the execution timing of the normal-return determination based on the fuel injection amount and the target injection amount when the correction time reaches the upper limit value. ### Claim 9 (depends on 8) The injection control device of claim 8, wherein the injection control device is further configured to: determine the execution timing of the normal-return determination as a timing of when a ratio of the fuel injection amount against the target injection amount when the correction time reaches the upper limit value is equal to or greater than a predetermined first threshold value. ### Claim 10 (depends on 8) The injection control device of claim 8, wherein the injection control device is further configured to: determine the execution timing of the normal-return determination as a timing of when a difference between the fuel injection amount and the target injection amount when the correction time reaches the upper limit value is equal to or less than a predetermined second threshold value. ### Claim 11 (depends on 8) The injection control device of claim 8, wherein the injection control device is further configured to: determine the execution timing of the normal-return determination as a timing of when a ratio of (i) a difference between the fuel injection amount and the target injection amount against (ii) the target injection amount when the correction time reaches the upper limit value is equal to or less than a predetermined third threshold value. ### Claim 12 (depends on 7) The injection control device of claim 7, wherein the injection control device is further configured to: execute the normal-return determination multiple times, and determines whether or not the abnormal state has returned to the normal state based on determination results of multiple time determinations.