Method for controlling an engine system

Patent metadata

Field	Value
Publication number	US-9567917-B2
Application number	US-201514731856-A
Country	US
Kind code	B2
Filing date	Jun 5, 2015
Priority date	Jun 18, 2014
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A method is provided for controlling an engine system including an engine, a controller, a clean emissions module (CEM), and a cooling system driven at least partly by the engine system for regulating a temperature of at least part of the CEM.

First claim

The invention claimed is:

1. A method for controlling an engine system, the engine system comprising an internal combustion engine, a controller, a clean emissions module (CEM), and a cooling system driven at least partly by the engine system for regulating a temperature of at least part of the CEM, the method comprising:
determining an exhaust gas temperature in the engine system;
receiving an engine shutdown signal indicative that the engine is to be shut down;
performing, based on the received engine shutdown signal and a determination that the exhaust gas temperature has exceeded a first temperature threshold, a predefined engine operation for the engine system so as to allow temperature regulation by the cooling system; and
ceasing the predefined engine operation based on a determination that the exhaust gas temperature has fallen below a second temperature threshold, different to the first temperature threshold.

2. A method according to claim 1 , wherein the first temperature threshold is higher than the second temperature threshold.

3. A method according to claim 1 , wherein the first temperature threshold is selected so as to represent a predetermined operational temperature of a fluid injector of the clean emissions module based on a first operational condition of the engine system, and wherein the second temperature threshold is selected so as to represent the predetermined operational temperature of the fluid injector based on a second operational condition of the engine system.

4. A method according to claim 3 , wherein the first temperature threshold is selected based on a cooling curve representing a correlation of values between the exhaust gas temperatures and the fluid injector temperature following the predefined engine operation.

5. A method according to claim 3 , wherein the second temperature threshold is selected based on a cooling curve representing a correlation of values between the exhaust gas temperatures and the fluid injector temperature following a change from a high temperature regeneration engine operation to the predefined engine operation.

6. A method according to claim 1 , wherein the predefined engine operation is performed when it has been determined that the exhaust gas temperature has exceeded the first temperature threshold for a predetermined time period.

7. A method according to claim 1 , wherein the ceasing of the predefined engine operation occurs when it is determined that the monitored exhaust as temperature is below the second temperature threshold for a predetermined time period.

8. A method according to claim 1 , wherein the first temperature threshold is selected to have a value in a temperature range of between 300° C. and 500° C.

9. A method according to claim 8 , wherein the first temperature threshold is approximately 370° C.

10. A method according to claim 1 , wherein the second temperature threshold is selected to have a value in a temperature range of between 200° C. and 300° C.

11. A method according to claim 10 , wherein the second temperature threshold for ceasing the predefined engine operation is approximately 250° C.

12. A method according to claim 1 , wherein ceasing the predefined engine operation comprises shutting down the internal combustion engine so that operation of the cooling system ceases.

13. A method according to claim 1 , wherein the predefined engine operation is an engine idle operation.

14. A computer program product comprising a set of computer-executable instructions, which when run on a computer, cause the computer to:
determine an exhaust gas temperature in an engine system at a point downstream from a diesel particulate filter (DPF) of the engine system and upstream of a selective catalytic reduction (SCR) module of the engine system;
receive an engine key-off signal;
perform, based on the received engine key-off signal and a determination that the exhaust gas temperature has exceeded an activation temperature threshold, a predefined engine operation for an internal combustion engine of the engine system so as to allow temperature regulation of at least part of the SCR module by a cooling system; and
cease the predefined engine operation based on a determination that the exhaust gas temperature has fallen below a deactivation temperature threshold;
wherein the activation temperature threshold is different to the deactivation temperature threshold.

15. A method according to claim 2 , wherein the first temperature threshold is selected so as to represent a predetermined operational temperature of a fluid injector of the clean emissions module based on a first operational condition of the engine system, and wherein the second temperature threshold is selected so as to represent the predetermined operational temperature of the fluid injector based on a second operational condition of the engine system.

16. A method according to claim 4 , wherein the second temperature threshold is selected based on a cooling curve representing a correlation of values between the exhaust gas temperatures and the fluid injector temperature following a change from a high temperature regeneration engine operation to the predefined engine operation.

17. A method according to claim 2 , wherein the predefined engine operation is performed when it has been determined that the exhaust gas temperature has exceeded the first temperature threshold for a predetermined time period.

18. A method according to claim 2 , wherein the ceasing of the predefined engine operation occurs when it is determined that the monitored exhaust gas temperature is below the second temperature threshold for a predetermined time period.

19. A method according to claim 2 , wherein the first temperature threshold is selected to have a value in a temperature range of between 300° C. and 500° C.

20. A method according to claim 2 , wherein the second temperature threshold is selected to have a value in a temperature range of between 200° C. and 300° C.

Assignees

• Perkins Engines Co Ltd

Inventors

• Mccloskey James K
• Gharpure Siddharth Subhash
• Smith Stuart P

Classifications

• F01N2900/1404

  Exhaust gas temperature · CPC title

• F01N2610/11

  the substance or part of the dosing system being cooled · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F02D41/042 Primary

  for stopping the engine · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title