# US 10,871,117 B2 · Sensor control apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,117 B2 - Document ID: US10871117B2 - Status: Granted - Kind: B2 - Application number: 16/070,894 - Filed: 2017-01-18 - Published: 2019-01-31 - Granted: 2020-12-22 - Earliest claimed: 2016-01-19 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Masahiro Yamamoto; Masayuki Tamura; Takashi Araki; Go Miyagawa; Manabu Yoshidome; Masato Katsuno; Toshihiro Sakawa - Web page: https://patentgrep.com/patent/US10871117B2 ## CPC - F02D 41/1466: {the characteristics being a soot concentration or content} - F01N 3/02: for cooling, or for removing solid constituents of, exhaust (by means of electric or electrostatic separators F01N3/01 {; mixing air with exhaust in tailpipes F01N13/082, F01N13/20}) - F02D 41/1494: {Control of sensor heater} - G01N 15/0656: {using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12)} - F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus - F01N 2240/16: an electric heater, i.e. a resistance heater - F01N 2560/05: the means being a particulate sensor - F01N 2560/20: Sensor having heating means - F01N 2900/0422: measuring the elapsed time - Y02T 10/12: Improving ICE efficiencies - 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) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract After an engine is started, an ECU performs first regeneration processing of a PM sensor through heating by a heater and, after the first regeneration processing, applies a voltage continuously to detection electrodes for a predetermined voltage application period. The ECU causes PM to adhere to an insulating substrate due to the voltage application and, at a time point after the predetermined time period has elapsed, determines the amount of PM that is adhering to the insulating substrate. When a predetermined condition is satisfied outside the voltage application period, the ECU determines whether the amount of adhering PM on the insulating substrate is equal to or greater than an excess determination threshold value. If the amount of adhering PM is determined to be equal to or greater than the excess determination threshold value, the ECU performs second regeneration processing of the PM sensor, through heating by the heater. ## Claims ### Claim 1 A sensor control apparatus configured for application to a sensor, the sensor comprising an adherence portion to which electrically conductive particulate matter contained in exhaust gas adheres, a pair of counter electrodes spaced apart from one another and disposed at the adherence portion, and a heater which heats the adherence portion, the sensor being disposed in an exhaust gas passage of an internal combustion engine and configured to output a detection signal in accordance with the amount of the adhering particulate matter, and the sensor control apparatus configured to detect the amount of the adhering particulate matter based on the detection signal, wherein the sensor control apparatus comprises: a processor; and a memory configured to stored computer readable instructions that, when executed by the processor, cause the sensor control apparatus to: perform first regeneration processing of the sensor, through heating by the heater, after the internal combustion engine is started; cause the particulate matter to adhere to the adherence portion by a condition in which a voltage is continuously applied to the pair of electrodes during a predetermined time period after the first regeneration processing has been performed, and perform first determination processing which determines the amount of adhering particulate matter on the adherence portion at a time point after the predetermined time period has elapsed; perform second determination processing which determines whether or not the amount of adhering particulate matter on the adherence portion is equal to or greater than a predetermined value in response to a predetermined condition being satisfied outside of the predetermined time period; perform second regeneration processing of the sensor through heating by the heater in response to determining that the amount of adhering particulate matter on the adherence portion is equal to or greater than the predetermined value; perform the first regeneration processing, after a predetermined drying period has elapsed for evaporating the condensed water in an exhaust pipe after the internal combustion engine is started; and perform a determination of the amount of adhering particulate matter each time that a predetermined condition is satisfied, after the determination by the first determination processing. ### Claim 2 (depends on 1) The sensor control apparatus according to claim 1, wherein each time the predetermined condition is satisfied, the processor is configured to perform the second determination processing that applies a voltage to the counter electrodes, and determine the amount of adhering particulate matter. ### Claim 3 (depends on 1) The sensor control apparatus according to claim 1, wherein the processor is configured to perform the first regeneration processing and an adherence amount determination processing that determines the amount of adhering particulate matter, in response to a predetermined number of times being attained for the number of times the amount of adhering particulate matter has been determined to be equal to or greater than a predetermined value. ### Claim 4 (depends on 1) The sensor control apparatus according to claim 1 wherein the processor is further configured to: information acquisition that acquires vehicle information including at least one of a traveled distance and a running time of a vehicle equipped with the sensor; and perform first condition alteration processing that changes the predetermined condition, with the change being based upon the vehicle information. ### Claim 5 (depends on 1) The sensor control apparatus according to claim 1, wherein the processor is further configured to perform second condition alteration processing that alters a processing condition of the second regeneration processing, based upon the amount of adhering particulate matter, in response to determining by the second determination processing that the amount of adhering particulate matter is equal to or greater than a predetermined value. ### Claim 6 (depends on 1) The sensor control apparatus according to claim 1, wherein: to determine whether the amount of adhering particulate matter that has reached the sensor is an appropriate amount, the processor is configured to perform the first determination processing that determines whether the amount of adhering particulate matter is equal to or greater than an abnormality determination threshold value; and the predetermined value for the second determination processing is set as a value that is smaller than the abnormality determination threshold value. ### Claim 7 (depends on 1) The sensor control apparatus according to claim 1, wherein: the sensor is disposed in an exhaust gas passage of the internal combustion engine, at the downstream side of a filter apparatus that collects the particulate matter; and the processor is configured to perform the first determination processing that determines whether there is abnormality of the filter apparatus, based upon the amount of adhering particulate matter. ### Claim 8 A sensor control apparatus configured for application to a sensor, the sensor comprising an adherence portion to which electrically conductive particulate matter contained in exhaust gas adheres, a pair of counter electrodes spaced apart from one another and disposed at the adherence portion, and a heater which heats the adherence portion, the sensor being disposed in an exhaust gas passage of an internal combustion engine and configured to output a detection signal in accordance with the amount of the adhering particulate matter, and the sensor control apparatus configured to detect the amount of the adhering particulate matter based on the detection signal, wherein the sensor control apparatus comprises: a processor; and a memory configured to stored computer readable instructions that, when executed by the processor, cause the sensor control apparatus to: perform first regeneration processing of the sensor, through heating by the heater, after the internal combustion engine is started; cause the particulate matter to adhere to the adherence portion by a condition in which a voltage is continuously applied to the pair of electrodes during a predetermined time period after the first regeneration processing has been performed, and perform first determination processing which determines the amount of adhering particulate matter on the adherence portion at a time point after the predetermined time period has elapsed; perform second determination processing which determines whether or not the amount of adhering particulate matter on the adherence portion is equal to or greater than a predetermined value in response to a predetermined condition being satisfied outside of the predetermined time period; perform second regeneration processing of the sensor through heating by the heater in response to determining that the amount of adhering particulate matter on the adherence portion is equal to or greater than the predetermined value; and perform the first regeneration processing and an adherence amount determination processing that determines the amount of adhering particulate matter, in response to a predetermined number of times being attained for the number of times the amount of adhering particulate matter has been determined to be equal to or greater than a predetermined value. ### Claim 9 A sensor control apparatus configured for application to a sensor, the sensor comprising an adherence portion to which electrically conductive particulate matter contained in exhaust gas adheres, a pair of counter electrodes spaced apart from one another and disposed at the adherence portion, and a heater which heats the adherence portion, the sensor being disposed in an exhaust gas passage of an internal combustion engine and configured to output a detection signal in accordance with the amount of the adhering particulate matter, and the sensor control apparatus configured to detect the amount of the adhering particulate matter based on the detection signal, wherein the sensor control apparatus comprises: a processor; and a memory configured to stored computer readable instructions that, when executed by the processor, cause the sensor control apparatus to: perform first regeneration processing of the sensor, through heating by the heater, after the internal combustion engine is started; cause the particulate matter to adhere to the adherence portion by a condition in which a voltage is continuously applied to the pair of electrodes during a predetermined time period after the first regeneration processing has been performed, and perform first determination processing which determines the amount of adhering particulate matter on the adherence portion at a time point after the predetermined time period has elapsed; perform second determination processing which determines whether or not the amount of adhering particulate matter on the adherence portion is equal to or greater than a predetermined value in response to a predetermined condition being satisfied outside of the predetermined time period; perform second regeneration processing of the sensor through heating by the heater in response to determining that the amount of adhering particulate matter on the adherence portion is equal to or greater than the predetermined value; perform information acquisition processing that acquires vehicle information including at least one of a traveled distance and a running time of a vehicle equipped with the sensor; and perform first condition alteration processing that changes the predetermined condition, with the change being based upon the vehicle information.