# US 11,028,793 B2 · Internal combustion engine control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,793 B2 - Document ID: US11028793B2 - Status: Granted - Kind: B2 - Application number: 16/788,659 - Filed: 2020-02-12 - Published: 2020-06-11 - Granted: 2021-06-08 - Earliest claimed: 2017-08-30 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Takanobu Goto - Web page: https://patentgrep.com/patent/US11028793B2 ## CPC - F02D 41/04: Introducing corrections for particular operating conditions (F02D41/14 takes precedence) - F02D 17/04: rendering engines inoperative or idling, e.g. caused by abnormal conditions (dependent on lubricating conditions F01M1/22; dependent on cooling F01P5/14) - F02D 41/1497: {With detection of the mechanical response of the engine} - F02D 41/222: {relating to the failure of sensors or parameter detection devices} - F02D 2200/021: Engine temperature - F02D 2200/023: Temperature of lubricating oil or working fluid - F02D 2200/1004: Estimation of the output torque - 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 A control unit controls a combustion state of an internal combustion engine based on a detection value of a temperature sensor. A monitor unit calculates an estimated torque of actual torque of the internal combustion engine and calculates an engine-requested torque requested for the internal combustion engine and to monitor whether the estimated torque differs from the engine-requested torque by an amount that is more than or equal to a predetermined criterion. A detection abnormality determination unit determines whether a detection value or behavior of the detection value is abnormal. The monitor unit includes: a normal-state torque calculation unit to calculate an estimated torque by using the detection value when the detection abnormality determination unit does not determine an abnormality; and an abnormal-state torque calculation unit to calculate an estimated torque by inhibiting using of the detection value when the detection abnormality determination unit determines an abnormality. ## Claims ### Claim 1 An internal combustion engine control system comprising: a control unit configured to control a combustion state of an internal combustion engine based on a detection value of a temperature sensor that is configured to detect a temperature of a detection object; a monitor unit configured to calculate an estimated torque as an estimated value of an actual torque of the internal combustion engine and an engine-requested torque requested for the internal combustion engine and to monitor whether the estimated torque differs from the engine-requested torque by an amount greater than or equal to a predetermined criterion to be in an abnormal torque state; and a detection abnormality determination unit configured to determine whether one of the detection value and a behavior of the detection value is abnormal, wherein the monitor unit includes: a normal-state torque calculation unit configured to calculate the estimated torque by using the detection value when the detection abnormality determination unit does not determine an abnormality; and an abnormal-state torque calculation unit configured to calculate the estimated torque by inhibiting using of the detection value when the detection abnormality determination unit determines an abnormality, wherein the detection abnormality determination unit includes an upper and lower limit determination unit configured to determine an abnormality when the detection value exceeds a predetermined range between upper and lower limits, and the abnormal-state torque calculation unit is configured to: measure an abnormality state elapsed time that has elapsed from the determination of an abnormality by the upper and lower limit determination unit, and calculate the estimated torque while inhibiting using of the detection value on determination that the abnormality state elapsed time does not exceed a predetermined time. ### Claim 2 (depends on 1) The internal combustion engine control system according to claim 1, wherein the control unit is provided as a control-use arithmetic device configured to use a control-use storage area, and the monitor unit is provided as a monitor-use arithmetic device configured to use a monitor-use storage area different from the control-use storage area. ### Claim 3 (depends on 2) The internal combustion engine control system according to claim 2, wherein an operation cycle of the monitor-use arithmetic device is longer than an operation cycle of the control-use arithmetic device. ### Claim 4 (depends on 2) The internal combustion engine control system according to claim 2, wherein the monitor-use arithmetic device includes an input securing unit configured to check normality of data acquired from outside the monitor-use arithmetic device. ### Claim 5 (depends on 1) The internal combustion engine control system according to claim 1, wherein the monitor unit is configured to cause the abnormal-state torque calculation unit to calculate the estimated torque by using a previous detection value that is acquired before the determination of the abnormality, without using a current detection value that is currently acquired, on determination that the abnormality state elapsed time does not exceed the predetermined time. ### Claim 6 (depends on 1) The internal combustion engine control system according to claim 1, wherein the monitor unit is configured to cause the normal-state torque calculation unit to calculate the estimated torque by using the current detection value that is currently acquired, on determination by the upper and lower limit determination unit that the detection value does not exceed the predetermined range between upper and lower limits. ### Claim 7 (depends on 1) The internal combustion engine control system according to claim 1, wherein the monitor unit is configured to determine that the temperature sensor malfunctions and output a result of the determination that the temperature sensor malfunctions, on determination that the abnormality state elapsed time has exceeded the predetermined time.