# US 10,480,380 B2 · Reducing heating of a particulate filter during a regeneration event > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,380 B2 - Document ID: US10480380B2 - Status: Granted - Kind: B2 - Application number: 15/499,991 - Filed: 2017-04-28 - Published: 2017-11-02 - Granted: 2019-11-19 - Earliest claimed: 2016-04-29 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Ashish Kumar Naidu; Peter George Brittle - Web page: https://patentgrep.com/patent/US10480380B2 ## CPC - F01N 9/002: {of filter regeneration} - F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles - F02D 41/029: {the exhaust gas treating apparatus being a particulate filter} - F01N 2240/04: an electric, e.g. electrostatic, device other than a heater - F01N 2260/04: for regeneration or reactivation, e.g. of catalyst - F01N 2430/00: Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics - F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture - F01N 2900/08: said parameters being related to the engine - F01N 2900/104: Battery status - F02D 2041/026: {using an external load, e.g. by increasing generator load or by changing the gear ratio} - F02D 2200/0802: Temperature of the exhaust gas treatment apparatus - Y02T 10/40: Engine management systems - 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) - 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 vehicle and method reduce heating of a particulate filter during a regeneration event in response to an accelerator pedal tip-out and particulate filter temperature exceeding or anticipated to exceed a threshold by fueling the engine to reduce oxygen in the exhaust flowing to the particulate filter. An electric machine may be operated as a generator charging a battery to compensate or offset torque produced by the fueling of the engine. The current or anticipated particulate filter temperature may be estimated by a soot combustion model for a current regeneration event and/or a future regeneration event based on soot loading of the particulate filter. ## Claims ### Claim 1 A vehicle comprising: an engine; a battery; an electric machine coupled to the engine and connected to the battery; a particulate filter receiving engine exhaust gas; and a controller configured to, in response to predicted particulate filter temperature during a subsequent regeneration exceeding a threshold, operate the electric machine to discharge the battery in preparation for operating the electric machine to charge the battery during the subsequent regeneration while fueling the engine to compensate for torque used by the electric machine to reduce oxygen in the exhaust gas flowing to the particulate filter. ### Claim 2 (depends on 1) The vehicle of claim 1 wherein the controller is further configured to operate the electric machine to discharge the battery in response to soot loading of the particulate filter exceeding a corresponding threshold. ### Claim 3 (depends on 1) The vehicle of claim 1 further comprising a temperature sensor configured to provide an indication of a current particulate filter temperature. ### Claim 4 (depends on 3) The vehicle of claim 3 wherein the temperature sensor is configured to measure temperature of exhaust gas exiting the particulate filter. ### Claim 5 (depends on 1) The vehicle of claim 1 wherein the controller is further configured to estimate the predicted particulate filter temperature during the subsequent regeneration using a soot combustion model. ### Claim 6 (depends on 1) The vehicle of claim 1 further comprising an accelerator pedal, wherein the controller is further configured to operate the electric machine to charge the battery in response to a tip-out of the accelerator pedal during the regeneration. ### Claim 7 (depends on 1) The vehicle of claim 1 wherein the controller is further configured to reduce a state of charge of the battery prior to a regeneration event if the state of charge of the battery is above a predefined level and an estimate of current soot loading of the particulate filter exceeds a regeneration threshold, the regeneration threshold being lower than a threshold that triggers activation of a regeneration event. ### Claim 8 A vehicle having an engine coupled to an electric machine connected to a traction battery and including a particulate filter configured to receive engine exhaust, comprising: a controller configured to: operate the electric machine to reduce a state of charge of the traction battery prior to a subsequent filter regeneration event responsive to the state of charge of the battery being above a predefined level and a predicted temperature of the particulate filter during the subsequent regeneration event exceeding a threshold; and in response to an accelerator pedal tip-out during the subsequent filter regeneration event and filter temperature exceeding a threshold: increase fuel to the engine to reduce oxygen in the engine exhaust; and operate the electric machine to charge the battery and offset torque produced by increasing the fuel. ### Claim 9 (depends on 8) The vehicle of claim 8 wherein the controller is further configured to predict the filter temperature during the subsequent regeneration event using a soot combustion model. ### Claim 10 A vehicle comprising: an engine; a battery; an electric machine coupled to the engine and connected to the battery; a particulate filter receiving engine exhaust gas; and a controller configured to reduce a state of charge of the battery prior to a regeneration event responsive to the state of charge of the battery being above a predefined level and an estimate of current soot loading of the particulate filter exceeding a regeneration threshold, the regeneration threshold being lower than a threshold that triggers activation of a regeneration event. ### Claim 11 (depends on 10) The vehicle of claim 10 wherein the controller is further configured to, responsive to the activation of the regeneration event, operate the electric machine to charge the battery while fueling the engine to compensate for torque used by the electric machine to reduce oxygen in the exhaust gas flowing to the particulate filter. ### Claim 12 (depends on 11) The vehicle of claim 11 wherein the electric machine comprises an integrated starter-generator. ### Claim 13 (depends on 12) The vehicle of claim 12 wherein the estimate of current soot loading is based on a pressure drop across the particulate filter.