# US 10,502,113 B2 · Selective catalytic reduction ammonia storage control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,113 B2 - Document ID: US10502113B2 - Status: Granted - Kind: B2 - Application number: 15/645,437 - Filed: 2017-07-10 - Published: 2019-01-10 - Granted: 2019-12-10 - Earliest claimed: 2017-07-10 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Anirban Sett - Web page: https://patentgrep.com/patent/US10502113B2 ## CPC - F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent} - F01N 3/035: with catalytic reactors - F01N 3/2066: {Selective catalytic reduction [SCR]} - 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 - F01N 2560/026: for measuring or detecting NOx - F01N 2560/06: the means being a temperature sensor - F01N 2610/02: the substance being ammonia or urea - F01N 2900/0412: using pre-calibrated maps, tables or charts - F01N 2900/1806: Properties of reducing agent or dosing system - F01N 2900/1812: Flow rate - 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 - 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 Technical solutions are described for an emissions control system for controlling a selective catalytic reduction (SCR) device of an exhaust system of an internal combustion engine. An example computer-implemented method includes governing a reductant dosing in the SCR device. For example, governing the dosing includes computing a reductant dosing rate based on a chemical model of the SCR device. Further, the governing includes determining a temperature modulation factor based on inlet temperature of exhaust gas input for the SCR. The method further includes adjusting the reductant dosing rate by scaling the reductant dosing rate by the temperature modulation factor. The method further includes causing an amount of reductant to be injected into an SCR catalyst according to the adjusted reductant dosing rate. ## Claims ### Claim 1 An emissions control system for treating exhaust gas in a motor vehicle including an internal combustion engine, the emissions control system comprising: a selective catalytic reduction (SCR) device; an NOx sensor; and a controller that is configured to govern a reductant dosing in the SCR device by: computing a reductant dosing rate based on a chemical model of the SCR device; determining a temperature modulation factor based on an inlet temperature of the SCR device and on an inlet NOx concentration in the exhaust gas that is input to the SCR device, wherein the temperature modulation factor is determined by accessing a look-up table based on the inlet temperature and the inlet NOx concentration; adjusting the reductant dosing rate by scaling the reductant dosing rate by the temperature modulation factor; and causing an amount of reductant to be injected into the SCR device according to the adjusted reductant dosing rate. ### Claim 2 (depends on 1) The emissions control system of claim 1, wherein the reductant dosing rate is computed based on a rate of the exhaust gas that is input to the SCR device, and a difference in reductant stored in an SCR catalyst of the SCR device and a predicted amount of reductant stored in the SCR catalyst. ### Claim 3 (depends on 1) The emissions control system of claim 1, wherein determining the temperature modulation factor comprises accessing a look-up table corresponding to the inlet temperature. ### Claim 4 (depends on 1) The emissions control system of claim 1, wherein governing the reductant dosing in the SCR device further comprises: determining an age modulation factor for the SCR device; and adjusting the reductant dosing rate further by scaling the reductant dosing rate by the age factor. ### Claim 5 (depends on 4) The emissions control system of claim 4, wherein the age modulation factor is determined by monitoring temperature-weighted time of the SCR device. ### Claim 6 An exhaust system for treating exhaust gas emitted by an internal combustion engine, configured to perform a selective catalytic reduction (SCR) of exhaust gas, the exhaust system comprising: a controller configured to govern a reductant dosing for the SCR by: computing a reductant dosing rate based on a chemical model of the SCR; determining a temperature modulation factor based on inlet temperature of exhaust gas input for the SCR and on an inlet NOx concentration in the exhaust gas that is input to the SCR device, wherein the temperature modulation factor is determined by accessing a look-up table based on the inlet temperature and the inlet NOx concentration; adjusting the reductant dosing rate by scaling the reductant dosing rate by the temperature modulation factor; and causing an amount of reductant to be injected into an SCR catalyst according to the adjusted reductant dosing rate. ### Claim 7 (depends on 6) The exhaust system of claim 6, wherein the reductant dosing rate is computed based on a rate of exhaust gases input to the SCR, and a difference in reductant stored in the SCR catalyst and a predicted amount of reductant stored in the SCR catalyst. ### Claim 8 (depends on 6) The exhaust system of claim 6, wherein determining the temperature modulation factor comprises accessing a look-up table corresponding to the inlet temperature. ### Claim 9 (depends on 6) The exhaust system of claim 6, wherein governing the reductant dosing in the SCR further comprises: determining an age modulation factor for the SCR catalyst; and adjusting the reductant dosing rate further by scaling the reductant dosing rate by the age factor. ### Claim 10 (depends on 9) The exhaust system of claim 9, wherein the age modulation factor is determined by monitoring temperature-weighted time of the SCR catalyst. ### Claim 11 A computer-implemented method for controlling a selective catalytic reduction (SCR) device of an exhaust system of an internal combustion engine, the method comprising: governing a reductant dosing in the SCR device by: computing a reductant dosing rate based on a chemical model of the SCR device; determining a temperature modulation factor based on an inlet temperature of the SCR device and on an inlet NOx concentration in the exhaust gas that is input to the SCR device, wherein the temperature modulation factor is determined by accessing a look-up table based on the inlet temperature and the inlet NOx concentration; adjusting the reductant dosing rate by scaling the reductant dosing rate by the temperature modulation factor; and causing an amount of reductant to be injected into the SCR device according to the adjusted reductant dosing rate. ### Claim 12 (depends on 11) The method of claim 11, wherein the reductant dosing rate is computed based on a rate of exhaust gases input to the SCR device, and a difference in reductant stored in an SCR catalyst of the SCR device and a predicted amount of reductant stored in the SCR catalyst. ### Claim 13 (depends on 11) The method of claim 11, wherein governing the reductant dosing in the SCR device further comprises: determining an age modulation factor for the SCR device; and adjusting the reductant dosing rate further by scaling the reductant dosing rate by the age factor. ### Claim 14 (depends on 13) The method of claim 13, wherein the age modulation factor is determined by monitoring temperature-weighted time of the SCR device.