# US 2014/0150411 A1 · Reductant injection control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150411 A1 - Document ID: US20140150411A1 - Status: Published application - Kind: A1 - Application number: 13/690,090 - Filed: 2012-11-30 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Tenneco Automotive Operating Company Inc. - Applicants: Tenneco Automotive Operating Company Inc. - Inventors: Michael Golin; John DeGeorge; Guanyu Zheng; Adam J. Kotrba - Web page: https://patentgrep.com/patent/US20140150411A1 ## CPC - F01N 3/106: {Auxiliary oxidation catalysts} - F01N 3/025: using fuel burner or by adding fuel to exhaust - F01N 3/035: with catalytic reactors - F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent} - F01N 9/002: {of filter regeneration} - F01N 13/0097: {the purifying devices are arranged in a single housing} - F01N 13/017: {the purifying devices are arranged in a single housing} - F01N 2610/02: the substance being ammonia or urea - F01N 2900/1404: Exhaust gas temperature - F01N 2900/1411: Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust system including a plurality of exhaust treatment devices, plurality of injectors for dosing an exhaust treatment fluid into an exhaust stream, and a controller for controlling each of the plurality of injectors. The controller actively controls an amount of exhaust treatment fluid dosed into the exhaust stream by each of the plurality of injectors based on at least one of an exhaust flow rate and a temperature of the exhaust stream. ## Claims ### Claim 1 An exhaust system, comprising: a plurality of exhaust treatment devices arranged in parallel flow paths; a plurality of injectors for dosing an exhaust treatment fluid into an exhaust stream located in the parallel flow paths; a thermal enhancement device provided in each parallel flow path; and a controller for controlling each of the plurality of injectors and each of the thermal enhancement devices, wherein the controller actively controls an amount of exhaust treatment fluid dosed into the parallel flow paths by each of the plurality of injectors based on an exhaust flow rate of the exhaust stream through each of the parallel flow paths, and the controller actively controls operation of each of the thermal enhancement devices based on a temperature of the exhaust stream in each of the parallel flow paths. ### Claim 2 (depends on 1) The exhaust system of claim 1, wherein the controller actively controls the thermal enhancement devices to control a mass flow of the exhaust stream through the parallel flow paths. ### Claim 3 (depends on 1) The exhaust system of claim 1, wherein exhaust treatment devices are particulate filters, and the controller controls each of the thermal enhancement devices to regenerate each of the particulate filters simultaneously. ### Claim 4 (depends on 3) The exhaust system of claim 3, wherein if one of the particulate filters located in one of the parallel flow paths has regenerated before the other particulate filters, the controller reduces operation of the thermal enhancement device corresponding to the one particulate filter to lower the temperature of the exhaust stream in the one parallel flow path. ### Claim 5 (depends on 1) The exhaust system of claim 1, wherein each exhaust treatment device is an oxidation catalyst, and the controller actively controls the amount of exhaust treatment fluid dosed into the parallel flow paths based on a temperature of each parallel flow path to manipulate the mass flow rate of the exhaust stream in each parallel flow path. ### Claim 6 (depends on 1) The exhaust system of claim 1, wherein the exhaust treatment device is either an oxidation catalyst or an selective reduction catalyst, and the controller actively controls the plurality of injectors associated with each parallel flow path based on the amount of exhaust entering each parallel flow path. ### Claim 7 An exhaust system, comprising: an exhaust flow path divided into a plurality of legs; an exhaust treatment device disposed in each of the plurality of legs; a thermal enhancement device located in each leg, and a controller for controlling each thermal enhancement device based on a temperature of the exhaust stream in each of the legs. ### Claim 8 (depends on 7) The exhaust system of claim 7, wherein each exhaust treatment device is a particulate filter. ### Claim 9 (depends on 8) The exhaust system of claim 8, wherein the controller monitors the temperature in each leg during regeneration of the particulate filters with the thermal enhancement devices. ### Claim 10 (depends on 9) The exhaust system of claim 9, wherein the particulate filters are regenerated simultaneously. ### Claim 11 (depends on 10) The exhaust system of claim 10, wherein if one particulate filter is regenerated before the remaining particulate filters, the controller controls the thermal enhancement device that corresponds to the one particulate filter to reduce operation of the thermal enhancement device. ### Claim 12 (depends on 7) The exhaust system of claim 7, wherein the controller controls operation of the thermal enhancement devices to ensure substantially equal exhaust flow through each of the legs. ### Claim 13 An exhaust system, comprising: a plurality of exhaust treatment devices arranged in an array in an exhaust passage; a plurality of injectors disposed upstream of the exhaust treatment devices for dosing an exhaust treatment fluid into the exhaust passage, and a controller for controlling actuation of each of the injectors based on flow rate of an exhaust stream passing through each of the exhaust treatment devices, wherein the injectors that are disposed proximate the exhaust treatment devices that receive a greater flow rate of exhaust are actuated to a greater extent than the injectors that are disposed proximate the exhaust treatment devices that receive a lower flow rate of exhaust. ### Claim 14 (depends on 13) The exhaust system of claim 13, wherein the exhaust treatment devices are oxidation catalysts or reduction catalysts. ### Claim 15 (depends on 13) The exhaust system of claim 13, wherein the exhaust treatment devices are oxidation catalysts that include a particulate filter. ### Claim 16 (depends on 13) The exhaust system of claim 13, wherein the exhaust treatment devices include oxidation catalysts and reduction catalysts. ### Claim 17 (depends on 13) The exhaust system of claim 13, wherein the exhaust treatment devices are disposed in an isothermal box.