System and method for controlling engine

Patent metadata

Field	Value
Publication number	US-9447746-B2
Application number	US-201414170836-A
Country	US
Kind code	B2
Filing date	Feb 3, 2014
Priority date	Feb 3, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A control system of an engine is provided. The control system includes an inlet sensor configured to generate a signal indicative of an engine inlet air temperature and an intake manifold sensor configured to generate a signal indicative of an engine intake manifold air temperature. The control system includes a control module communicably coupled to the inlet sensor and the intake manifold sensor. The control module is configured to determine the engine inlet air temperature and the engine intake manifold air temperature. The control module is configured to determine an initial de-rate value based on a predetermined relationship between the engine inlet air temperature and the engine intake manifold air temperature. The control module is configured to determine a pre-stored de-rate modifier corresponding to an engine speed. The control module is configured to determine a final de-rate value based on the initial de-rate value and the pre-stored de-rate modifier.

First claim

What is claimed is:

1. A control system of an engine, the control system comprising:
at least one inlet sensor configured to generate a signal indicative of an engine inlet air temperature;
at least one intake manifold sensor configured to generate a signal indicative of an engine intake manifold air temperature; and
a control module communicably coupled to the at least one inlet sensor and the at least one intake manifold sensor, the control module configured to:
determine the engine inlet air temperature and the engine intake manifold air temperature based on the signals;
determine an initial de-rate value based on a predetermined relationship between the engine inlet air temperature and the engine intake manifold air temperature;
determine a pre-stored de-rate modifier corresponding to an engine speed; and
determine a final de-rate value based on the initial de-rate value and the pre-stored de-rate modifier.

2. The control system of claim 1 , wherein the control module is further configured to determine the final de-rate value by multiplying the initial de-rate value with the pre-stored de-rate modifier.

3. The control system of claim 1 , wherein the de-rate modifier is zero below a predetermined engine speed.

4. The control system of claim 3 , wherein the predetermined engine speed is equal to or greater than an idling speed of the engine.

5. The control system of claim 1 , wherein the control module is further configured to set the final de-rate value to zero if the final de-rate value is lower than or equal to a preset value.

6. The control system of claim 1 , wherein the control system is associated with a plurality of engines, and wherein the control module is configured to:
determine the final de-rate values for each of the plurality of engines; and
determine a final common de-rate value for the plurality of engines based on a maximum of the final de-rate values for each of the plurality of engines.

7. The control system of claim 1 , wherein the control module is further configured to selectively generate an alarm based on the final de-rate value.

8. The control system of claim 1 , wherein the control module is further configured to selectively generate an event log based on the final de-rate value.

9. The control system of claim 1 , wherein the control module is further configured to:
receive de-rate values based on one or more other operational parameters of the engine; and
de-rate the engine based on a maximum of the de-rate values and the final de-rate value.

10. The control system of claim 9 , wherein the other operational parameters of the engine is one of an engine coolant temperature and a fuel pressure.

11. A method of controlling an engine, the method comprising:
determining an engine inlet air temperature and an engine intake manifold air temperature;
determining an initial de-rate value based on a predetermined relationship between the engine inlet air temperature and the engine intake manifold air temperature;
determining a pre-stored de-rate modifier corresponding to an engine speed; and
determining a final de-rate value based on the initial de-rate value and the pre-stored de-rate modifier.

12. The method of claim 11 further comprises determining the final de-rate value by multiplying the initial de-rate value with the pre-stored de-rate modifier.

13. The method of claim 11 , wherein the de-rate modifier is zero below a predetermined engine speed.

14. The method of claim 13 , wherein the predetermined engine speed is equal to or below an idling speed of the engine.

15. The method of claim 11 further comprises setting the final de-rate value to zero if the final de-rate value is lower than or equal to a preset value.

16. The method of claim 11 further comprises controlling a plurality of engines, wherein controlling the plurality of engines comprises:
determining the final de-rate values for each of the plurality of engines; and
determining a final common de-rate value for the plurality of engines based on a maximum of the final de-rate values for each of the plurality of engines.

17. The method of claim 11 further comprises selectively generating an alarm based on the final de-rate value.

18. The method of claim 11 further comprises:
receiving de-rate values based on one or more other operational parameters of the engine; and
de-rating the engine based on a maximum of the de-rate values and the final de-rate value.

19. The method of claim 18 , wherein the other operational parameters of the engine is one of an engine coolant temperature and a fuel pressure.

20. A method of controlling an engine, the method comprising:
determining an engine inlet air temperature and an engine intake manifold air temperature;
determining an initial de-rate value based on a predetermined relationship between the engine inlet air temperature and the engine intake manifold air temperature;
determining a pre-stored de-rate modifier corresponding to an engine speed;
determining a final de-rate value by multiplying the initial de-rate value with the pre-stored de-rate modifier;
receiving de-rate values based on one or more other operational parameters of the engine; and
de-rating the engine based on a maximum of the de-rate values and the final de-rate value.

Assignees

• Caterpillar Inc

Inventors

• Boettcher Todd J
• Paul Mark C
• Leifheit Neal A
• Annin Joshua T
• Vittalraj Kalaivani
• Mcconville Matthew L
• Peters Justin

Classifications

• F02D2250/26

  by applying a torque limit · CPC title

• F02D2200/0414

  Air temperature · CPC title

• F02D2250/18

  Control of the engine output torque · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title

• F02D41/2451

  characterised by what is learned or calibrated · CPC title