Aftertreatment regeneration with variable time and temperature

Patent metadata

Field	Value
Publication number	US-10323555-B2
Application number	US-201816130452-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Oct 23, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A system includes an exhaust aftertreatment system operatively coupled to an engine. The exhaust aftertreatment system includes an exhaust aftertreatment component. A flow sensor is structured to provide an exhaust flow rate value of exhaust gas exiting the engine. A temperature sensor is structured to provide an exhaust temperature value of the exhaust gas proximate the exhaust aftertreatment component. A controller includes an exhaust conditions circuit structured to interpret the exhaust flow rate value via operative communication with each of the flow sensor, and to interpret the exhaust temperature value via operative communication with the temperature sensor. A regeneration time circuit is structured to determine a regeneration time value based on each of the exhaust flow rate value and the exhaust temperature value via a regeneration time lookup table. A regeneration control circuit is structured to control regeneration of the exhaust aftertreatment component based on the regeneration time value.

First claim

What is claimed is:

1. A system, comprising:
an exhaust aftertreatment system operatively coupled to an engine, the exhaust aftertreatment system including an exhaust aftertreatment component;
a flow sensor structured to provide an exhaust flow rate value of exhaust gas through the exhaust aftertreatment system;
a temperature sensor structured to provide an exhaust temperature value of the exhaust gas proximate the exhaust aftertreatment component; and
a controller in operative communication with each of the exhaust aftertreatment system, the flow sensor, and the temperature sensor, the controller comprising:
an exhaust conditions circuit structured to interpret the exhaust flow rate value via operative communication with the flow sensor, and to interpret the exhaust temperature value via operative communication with the temperature sensor,
a regeneration time circuit structured to determine a regeneration time value based on each of the exhaust flow rate value and the exhaust temperature value via a regeneration time lookup table, the regeneration time lookup table including a plurality of regeneration time values, each of the plurality of regeneration time values relating to a regeneration time required for nitrogen oxide conversion by the exhaust aftertreatment component to reach a predetermined nitrogen oxide conversion value for a particular exhaust flow rate value and exhaust temperature value,
wherein the exhaust flow rate value is a first exhaust flow rate value, the exhaust temperature value is a first exhaust temperature value, and the regeneration time value is a first regeneration time value,
wherein the exhaust conditions circuit is further structured to interpret a second exhaust flow rate value via operative communication with the flow sensor, and to interpret a second exhaust temperature value via operative communication with the temperature sensor,
wherein the regeneration time circuit is further structured to determine a second regeneration time value based on each of the second exhaust flow rate value and the second exhaust temperature value via the regeneration time lookup table, and
a regeneration control circuit operatively and communicably coupled to each of the exhaust aftertreatment system and the regeneration time circuit, the regeneration control circuit structured to control regeneration of the exhaust aftertreatment component based on the second regeneration time value.

2. The system of claim 1 , wherein regeneration of the exhaust aftertreatment component includes noxidation regeneration.

3. A system, comprising:
an exhaust aftertreatment system operatively coupled to an engine, the exhaust aftertreatment system including an exhaust aftertreatment component;
a flow sensor structured to provide an exhaust flow rate value of exhaust gas through the exhaust aftertreatment system;
a temperature sensor structured to provide an exhaust temperature value of the exhaust gas proximate the exhaust aftertreatment component; and
a controller in operative communication with each of the exhaust aftertreatment system, the flow sensor, and the temperature sensor, the controller comprising:
an exhaust conditions circuit structured to interpret the exhaust flow rate value via operative communication with the flow sensor, and to interpret the exhaust temperature value via operative communication with the temperature sensor,
a regeneration time circuit structured to determine a regeneration time value based on each of the exhaust flow rate value and the exhaust temperature value via a regeneration time lookup table, the regeneration time lookup table including a plurality of regeneration time values, each of the plurality of regeneration time values relating to a regeneration time required for nitrogen oxide conversion by the exhaust aftertreatment component to reach a predetermined nitrogen oxide conversion value for a particular exhaust flow rate value and exhaust temperature value, and
a regeneration control circuit operatively and communicably coupled to each of the exhaust aftertreatment system and the regeneration time circuit, the regeneration control circuit structured to control regeneration of the exhaust aftertreatment component based on the regeneration time value;

a differential pressure sensor structured to provide a differential pressure value indicative of a difference between a first pressure of the exhaust gas upstream of the exhaust aftertreatment component and a second pressure of the exhaust gas downstream of the exhaust aftertreatment component,
wherein the exhaust conditions circuit is further structured to interpret the differential pressure value via operative communication with the differential pressure sensor, and
wherein the regeneration control circuit is structured to initiate regeneration of the exhaust aftertreatment component if the differential pressure value exceeds a predetermined value.

4. The system of claim 3 , wherein initiation of regeneration of the exhaust aftertreatment component comprises dosing reactant fluid upstream of the exhaust aftertreatment component so as to increase temperature of the exhaust gas upstream of the exhaust aftertreatment component.

5. The system of claim 4 , wherein the regeneration control circuit is structured to maintain regeneration of the exhaust aftertreatment component for an amount of time indicated by the regeneration time value.

6. A method, comprising:
determining an exhaust flow rate value of exhaust gas exiting an engine via operative communication with a flow sensor;
determining an exhaust temperature value of the exhaust gas proximate an exhaust aftertreatment component via operative communication with a temperature sensor; determining a regeneration time value based on each of the exhaust flow rate value and the exhaust temperature value via a regeneration time lookup table, the regeneration time lookup table including a plurality of regeneration time values, each of the plurality of regeneration time values relating to a regeneration time required for nitrogen oxide conversion by the exhaust aftertreatment component to reach a predetermined nitrogen oxide conversion value for a particular exhaust flow rate value and exhaust temperature value, wherein the exhaust flow rate value is a first exhaust flow rate value, the exhaust temperature value is a first exhaust temperature value, and the regeneration time value is a first regeneration time value, and further comprising:
determining a second exhaust flow rate value via operative communication with the flow sensor:
determining a second exhaust temperature value via operative communication with the temperature sensor;
determining a second regeneration time value based on each of the second exhaust flow rate value and the second exhaust temperature value via the regeneration time lookup table; and
dynamically controlling regeneration of the exhaust aftertreatment component based on the second regeneration time value.

7. The method of claim 6 , wherein regeneration of the exhaust aftertreatment component includes noxidation regeneration.

8. A method, comprising:
determining an exhaust flow rate value of exhaust gas exiting an engine via operative communication with a flow sensor;
determining an exhaust temperature value of the exhaust gas proximate an exhaust aftertreatment component via operative communication with a temperature sensor;
determining a regeneration time value based on each of the exhaust flow rate value and the exhaust temperature value via a regeneration time lookup table, the regeneration time lookup table including a plurality of regeneration time values, each of the plurality of regeneration time values relating to a regeneration time required for nitrogen oxide conversion b

Assignees

• Cummins Inc

Inventors

• Marathe Salil H
• Patel Pourash G
• Cramer James A

Classifications

• F01N2900/1404

  Exhaust gas temperature · CPC title

• F01N2560/06

  the means being a temperature sensor · CPC title

• Y02T10/47

  Cross-Sectional Technologies · mapped topic

• F01N9/00

  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) · CPC title

• F01N3/20 Primary

  specially adapted for catalytic conversion (F01N3/22 takes precedence) · CPC title