# US 10,502,150 B2 · Method and system for use when correcting supply of an additive to an exhaust gas stream > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,150 B2 - Document ID: US10502150B2 - Status: Granted - Kind: B2 - Application number: 15/767,340 - Filed: 2016-10-27 - Published: 2018-10-18 - Granted: 2019-12-10 - Earliest claimed: 2015-10-28 - Assignees: Scania CV AB - Applicants: Scania CV AB - Inventors: Mikael Lundström; Christer Lundberg - Web page: https://patentgrep.com/patent/US10502150B2 ## CPC - F02D 41/0235: {in relation with the state of the exhaust gas treating apparatus (control of exhaust gas treating apparatus per se F01N)} - F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent} - F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) - F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus - F02D 41/1463: {of the exhaust gases downstream of exhaust gas treatment apparatus} - F01N 2550/05: Systems for adding substances into exhaust - F01N 2560/026: for measuring or detecting NOx - F01N 2560/14: having more than one sensor of one kind - F01N 2610/02: the substance being ammonia or urea - F01N 2610/146: Control thereof, e.g. control of injectors or injection valves - F01N 2900/0416: using the state of a sensor, e.g. of an exhaust gas sensor - F01N 2900/1402: Exhaust gas composition - F01N 2900/1812: Flow rate - F01N 2900/1818: Concentration of the reducing agent - F01N 2900/1821: Injector parameters - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/12: Improving ICE efficiencies - 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) - 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) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The present invention relates to a method for determining when to correct supply of additive to an exhaust gas stream resulting from combustion in at least one combustion chamber, wherein the additive is arranged for reduction of at least one substance resulting from said combustion by supplying the additive to an exhaust gas stream resulting from said combustion. The quantity of additive being supplied is subjectable to correction, and a sensor is subjected to the exhaust gas stream and arranged to measure occurrence of said at least one substance. The method comprises: by means of sensor signals from said sensor, determining a level of occurrence of said first substance in said exhaust gas stream, and determining when to correct said supply of additive on the basis of said occurrence of said first substance in said exhaust gas stream. ## Claims ### Claim 1 A method for determining when to correct supply of additive to an exhaust gas stream resulting from combustion in at least one combustion chamber, wherein the additive is arranged for reduction of at least one substance resulting from said combustion by supplying the additive to an exhaust gas stream resulting from said combustion, wherein the quantity of additive being supplied is subjectable to correction, and wherein a sensor is subjected to the exhaust gas stream and arranged to measure occurrence of said at least one substance, the method comprising: by means of sensor signals from said sensor, determining a level of emission of said first substance in said exhaust gas stream; and determining a length of at least one interval between corrections to said supply of additive to the exhaust gas stream, where the length of the at least one interval is based on said level of emission of said first substance in said exhaust gas stream. ### Claim 2 (depends on 1) A method according to claim 1 further comprising, when determining when to perform correction: reducing the time between consecutive corrections on the basis of said occurrence of said first substance in said exhaust gas stream. ### Claim 3 (depends on 1) A method according to claim 1 further comprising, when determining when to perform correction: controlling a period of time between consecutive corrections as a function of the level of emissions of said first substance. ### Claim 4 (depends on 1) A method according to claim 1 further comprising, when determining when to perform correction: controlling a period of time between consecutive corrections such that the time is reduced to a first time for a first level of emission and to a second time for a second level of emission, said first time being shorter than said second time when said first level of emission is higher than said second level of emission. ### Claim 5 (depends on 1) A method according to claim 1 further comprising: reducing the time between consecutive corrections such that the time is reduced more in relation to a predetermined time between consecutive corrections the higher the occurrence of said first substance in said exhaust gas stream is. ### Claim 6 (depends on 1) A method according to claim 1 further comprising: determining if said occurrence of said first substance in said exhaust gas stream exceeds a first limit; and initiating a correction when said occurrence of said first substance in said exhaust gas stream exceeds said first limit. ### Claim 7 (depends on 1) A method according to claim 1 further comprising: determining if said occurrence of said first substance in said exhaust gas stream increases substantially instantly; and initiating a correction when said occurrence of said first substance in said exhaust gas stream increases substantially instantly. ### Claim 8 (depends on 1) A method according to claim 1 further comprising: determining when to correct said supply of additive on the basis of said occurrence of said first substance in said exhaust gas stream and a quality of the additive. ### Claim 9 (depends on 8) A method according to claim 8 further comprising: reducing the time between consecutive corrections such that the time is reduced more in relation to a predetermined time between consecutive corrections the lower the quality of said additive is. ### Claim 10 (depends on 1) A method according to claim 1 further comprising: determining if said occurrence of said first substance in said exhaust gas stream exceeds a predetermined level; and initiating a correction when said occurrence of said first substance in said exhaust gas stream exceeds said predetermined level and a quality of the additive is below a first quality. ### Claim 11 (depends on 1) A method according to claim 1 further comprising: increasing the time between consecutive corrections when the occurrence of said first substance in said exhaust gas stream decreases following a correction. ### Claim 12 (depends on 1) A method according to claim 1 further comprising: determining when to correct supply of additive in a system where said first additive is supplied upstream a first catalytic converter and said presence of said at least one substance is determined downstream said catalytic converter. ### Claim 13 (depends on 1) A method according to claim 1 further comprising: determining said emissions as a quantity per unit work produced by said at least one combustion chamber. ### Claim 14 (depends on 1) A method according to claim 1, wherein said at least one combustion chamber is a combustion chamber of an internal combustion engine in a vehicle. ### Claim 15 A computer program product comprising computer program code stored on a non-transitory computer-readable medium, said computer program product for determining when to correct supply of additive to an exhaust gas stream resulting from combustion in at least one combustion chamber, wherein the additive is arranged for reduction of at least one substance resulting from said combustion by supplying the additive to an exhaust gas stream resulting from said combustion, wherein the quantity of additive being supplied is subjectable to correction, and wherein a sensor is subjected to the exhaust gas stream and arranged to measure occurrence of said at least one substance, said computer program product comprising computer instructions to cause one or more computer processors to perform the following operations: by means of sensor signals from said sensor, determining a level of emission of said first substance in said exhaust gas stream; and determining a length of at least one interval between corrections to said supply of additive to the exhaust gas stream, where the length of the at least one interval is based on said level of emission of said first substance in said exhaust gas stream. ### Claim 16 A system for determining when to correct supply of additive to an exhaust gas stream resulting from combustion in at least one combustion chamber, wherein the additive is arranged for reduction of at least one substance resulting from said combustion by supplying the additive to an exhaust gas stream resulting from said combustion, wherein the quantity of additive being supplied is subjectable to correction, and wherein a sensor is subjected to the exhaust gas stream and arranged to measure occurrence of said at least one substance, the system comprising: means for, by means of sensor signals from said sensor, determining a level of occurrence of said first substance in said exhaust gas stream; and means for determining a length of at least one interval between corrections to said supply of additive to the exhaust gas stream, where the length of the at least one interval is based on said level of emission of said first substance in said exhaust gas stream. ### Claim 17 A vehicle comprising a system for determining when to correct supply of additive to an exhaust gas stream resulting from combustion in at least one combustion chamber, wherein the additive is arranged for reduction of at least one substance resulting from said combustion by supplying the additive to an exhaust gas stream resulting from said combustion, wherein the quantity of additive being supplied is subjectable to correction, and wherein a sensor is subjected to the exhaust gas stream and arranged to measure occurrence of said at least one substance, the system comprising: means for, by means of sensor signals from said sensor, determining a level of occurrence of said first substance in said exhaust gas stream; and means for determining a length of at least one interval between corrections to said supply of additive to the exhaust gas stream, where the length of the at least one interval is based on said level of emission of said first substance in said exhaust gas stream.