Systems and methods for aftertreatment system thermal mangement using cylinder deactivation and/or intake-air throttling

Patent metadata

Field	Value
Publication number	US-12196144-B2
Application number	US-202318497688-A
Country	US
Kind code	B2
Filing date	Oct 30, 2023
Priority date	Oct 31, 2022
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Systems and methods for aftertreatment system thermal management using cylinder deactivation and/or intake-air throttling are disclosed. Systems and methods for thermal management of an aftertreatment system are provided herein. A controller coupled to an engine and an exhaust aftertreatment system is configured to: receive a first temperature value associated with the exhaust aftertreatment system and a second temperature value associated with the engine; determine, based on comparing the first temperature value to a first threshold, a thermal management mode including a first thermal management mode or a second thermal management mode; determine, responsive to determining the thermal management mode and based on comparing the second temperature value to a second threshold, an operating mode for the thermal management mode including at least one of a first operating mode or a second operating mode; and initiate the at least one of the first or the second operating mode.

First claim

What is claimed is:

1. A system comprising:
an exhaust aftertreatment system in exhaust gas receiving communication with an engine, the exhaust aftertreatment system comprising a selective catalytic reduction system; and
a controller coupled to the engine and the exhaust aftertreatment system, the controller configured to:
receive a first temperature value associated with the exhaust aftertreatment system and a second temperature value associated with the engine;
determine, based on comparing the first temperature value to a first threshold, a thermal management mode, wherein the thermal management mode includes a first thermal management mode or a second thermal management mode;
determine, responsive to determining the thermal management mode and based on comparing the second temperature value to a second threshold, an operating mode for the thermal management mode, wherein the operating mode includes at least one of a first operating mode or a second operating mode;
determine that the thermal management mode is the first thermal management mode based on determining that the first temperature value is below the first threshold, wherein the first thermal management mode is a warm up mode configured to increase a temperature of the exhaust gas;
determine that the thermal management mode is the second thermal management mode based on determining that the first temperature value is at or above the first threshold, wherein the second thermal management mode is a keep warm mode configured to maintain the temperature of the exhaust gas;
determine that the operating mode includes both of the first operating mode and the second operating mode based on determining that the second temperature value is above the second threshold, wherein the first operating mode is a cylinder deactivation CDA mode and the second operating mode is an intake-air throttle IAT mode; and
initiate the at least one of the first or the second operating mode.

2. The system of claim 1 , wherein the first temperature value is at least one of a temperature of the selective catalytic reduction system or a change in temperature over time of the selective catalytic reduction system.

3. The system of claim 1 , wherein the second temperature value is a temperature of an engine fluid.

4. The system of claim 1 , wherein determining the operating mode is further based on one or more engine operating parameters, the one or more engine operating parameters comprising at least one of an engine speed or an engine torque.

5. The system of claim 1 , wherein the controller is further configured to determine that the operating mode does not include the first operating mode based on determining that the second temperature value is below the second threshold.

6. The system of claim 5 , wherein the controller is further configured to:
determine a CDA mode parameter comprising a firing fraction for the CDA mode; and
determine an IAT mode parameter comprising a charge flow for the IAT mode.

7. The system of claim 1 , wherein in determining the operating mode, the controller is further configured to:
determine a first predicted enthalpy value for the CDA mode;
determine a second predicted enthalpy value for the IAT mode;
determine, based on determining that a difference between the first predicted enthalpy value and the second predicted enthalpy value is greater than a first maximum threshold, that the operating mode includes the first operating mode; and
determine, based on determining that the difference between the first predicted enthalpy value and the second predicted enthalpy value is less than a first minimum threshold, that the operating mode includes the second operating mode.

8. The system of claim 7 , wherein in determining the operating mode, the controller is further configured to:
determine a first predicted fuel consumption value for the CDA mode;
determine a second predicted fuel consumption value for the IAT mode;
determine that the operating mode includes the first operating mode based on a difference between the first predicted fuel consumption value and the second predicted fuel consumption value being less than a second minimum threshold; and
determine that the operating mode includes the second operating mode based on the difference between the first predicted fuel consumption value and the second predicted fuel consumption value being greater than the second minimum threshold.

9. A method comprising:
receiving a first temperature value associated with an exhaust aftertreatment system and a second temperature value associated with an engine;
determining, based on comparing the first temperature value to a first threshold, a thermal management mode, the thermal management mode including one of a first thermal management mode or a second thermal management mode;
determining, responsive to determining the thermal management mode and based on comparing the second temperature value to a second threshold, an operating mode for the determined one of the first thermal management mode or the second thermal management mode, the operating mode comprising at least one of a first operating mode or a second operating mode;
determining that the thermal management mode is the first thermal management mode based on determining that the first temperature value is below the first threshold, wherein the first thermal management mode is a warm up mode configured to increase a temperature of the exhaust gas;
determining that the thermal management mode is the second thermal management mode based on determining that the first temperature value is at or above the first threshold, wherein the second thermal management mode is a keep warm mode configured to maintain the temperature of the exhaust gas;
determining that the operating mode includes both of the first operating mode and the second operating mode based on determining that the second temperature value is above the second threshold, wherein the first operating mode is a cylinder deactivation CDA mode and the second operating mode is an intake-air throttle IAT mode; and
initiating the at least one of the first operating mode or the second operating mode.

10. The method of claim 9 , wherein the first temperature value is at least one of a temperature of a selective catalytic reduction system or a change in temperature over time of the selective catalytic reduction system.

11. The method of claim 9 , wherein the second temperature value is a temperature of an engine fluid.

12. The method of claim 9 , wherein determining the operating mode is further based on one or more engine operating parameters, the one or more engine operating parameters comprising at least one of an engine speed or an engine torque.

13. The method of claim 9 , further comprising determining that the operating mode does not include the first operating mode based on determining that the second temperature value is below the second threshold.

14. The method of claim 13 , further comprising:
determining a first operating mode parameter for the first operating mode; and
determining a second operating mode parameter for the second operating mode.

15. A method comprising:
receiving a first temperature value associated with an exhaust aftertreatment system and a second temperature value associated with an engine;
determining, based on comparing the first temperature value to a first threshold, a thermal management mode, the thermal management mode including one of a first thermal management mode or a second thermal management mode;
determining, responsive to determining the thermal management mode and based on comparing the se

Assignees

• Cummins Inc
• Tula Technology Inc
• Tula Technolgy Inc

Inventors

• Wang Kunpeng
• Wang Ke
• Zoe Yuan
• Cao Zhou

Classifications

• F01N2900/08

  said parameters being related to the engine · CPC title

• F02D2200/101

  Engine speed · CPC title

• F02D17/02

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title

• F01N2900/1602

  Temperature of exhaust gas apparatus · CPC title

• F01N2900/1404

  Exhaust gas temperature · CPC title