Apparatus, system, and method for detecting temperature threshold events in an aftertreatment device

• US 7,815,370 B2
• Filed: 10/11/2007
• Issued: 10/19/2010
• Est. Priority Date: 10/11/2007
• Status: Active Grant

• Current Assignee: Cummins Filtration Incorporated (Cummins Incorporated)
• Original Assignee: Cummins Filtration Incorporated (Cummins Incorporated)
• Inventors: Simon, Conrad J. III, Stafford, Randall J.
• Primary Examiner(s): Caputo; Lisa M
• Assistant Examiner(s): DUNLAP, JONATHAN M
• Application Number:
  US11/871,037
• Publication Number:
  US 20090097528A1
• Time in Patent Office: 1,104 Days
• Field of Search: 374/160, 374/183, 374/185, 116/207, 116/216
• US Class Current: 374/185
• CPC Class Codes: F01N 11/002 the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
• CPC Class Codes: F01N 2560/12 Other sensor principles, e.g. using electro conductivity of substrate or radio frequency
• CPC Class Codes: G01K 11/06 using melting, freezing, or softening
• CPC Class Codes: H01H 2037/768 characterised by the composition of the fusible material
• CPC Class Codes: H01H 37/006 with different switches operated at substantially different temperatures
• CPC Class Codes: H01H 37/761 with a fusible element forming part of the switched circuit H01H37/767 takes precedence
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An apparatus, system, and method are disclosed for detecting temperature threshold events in an aftertreatment device. The system may include an aftertreatment device configured to treat an exhaust gas of an internal combustion engine and a temperature responder disposed within a region of interest of the aftertreatment device. The temperature responder is configured to melt at a threshold temperature. The system may further include two access points electrically coupled to the temperature responder and an observation module configured to measure an electrical resistance value across the two access points. The observation module detects the melting of the temperature responder based on the electrical resistance value measured across the access points. In alternate embodiments the observation module is included within an engine control module (ECM) or a service tool.

Claims

1. An apparatus for detecting temperature threshold events in an aftertreatment device, the apparatus comprising:

at least one temperature responder disposed within a region of interest of the aftertreatment device, the temperature responder comprising a structure formed of a material configured to melt at a threshold temperature; and

an observation module configured to detect the melting of the temperature responder;

wherein the region of interest is defined within an emissions-reducing core of the aftertreatment device.

2. The apparatus of claim 1, further comprising two access points, wherein the temperature responder is configured to electrically couple the two access points, and wherein the observation module is configured to measure an electrical resistance value across the two access points and to detect the melting of the temperature responder based on the electrical resistance value, the apparatus further comprising a thermal event module configured to determine whether the region of interest of the aftertreatment device has exceeded the threshold temperature based on the melting of the temperature responder.

3. The apparatus of claim 2, wherein detecting the melting of the temperature responder comprises determining whether the electrical resistance value is a value consistent with an open circuit between the two access points.

4. The apparatus of claim 2, further comprising a plurality of temperature responders, each temperature responder comprising a structure formed of a material configured to melt at a distinct threshold temperature, wherein each temperature responder is configured to electrically couple the two access points in parallel, wherein the observation module is further configured to detect the melting of each temperature responder based on the electrical resistance value across the two access points, and wherein the thermal event module is further configured to determine whether the region of interest of the aftertreatment device has exceeded each distinct threshold temperature based on the melting of each temperature responder.

5. The apparatus of claim 4, wherein each temperature responder comprises a distinct electrical resistance value.

6. The apparatus of claim 2, further comprising an electronic control module (ECM) comprising:

the observation module;

the thermal event module, further configured to set a thermal event indicator based on the region of interest of the aftertreatment device exceeding the threshold temperature; and

a fault module configured to set a fault indicator based on the thermal event indicator.

7. The apparatus of claim 6, wherein the fault indicator comprises a member selected from the group consisting of an illuminated dashboard lamp, a network data value, and a communicated signal.

8. The apparatus of claim 6, further comprising a plurality of temperature responders, each temperature responder comprising a structure formed of a material configured to melt at a distinct threshold temperature, wherein each temperature responder is configured to electrically couple the two access points in parallel, wherein the observation module is further configured to detect the melting of each temperature responder based on the electrical resistance value across the two access points, and wherein the thermal event module is further configured to determine whether the region of interest of the aftertreatment device has exceeded each distinct threshold temperature based on the melting of each temperature responder, and to set the thermal event indicator based on the region of interest of the aftertreatment device exceeding each threshold temperature.

9. The apparatus of claim 1, further comprising an encapsulation device comprising a gas impermeable chamber disposed within the region of interest, wherein the temperature responder is disposed within the encapsulation device.

10. The apparatus of claim 1, further comprising at least one temperature responder disposed within each of a plurality of areas of interest within the aftertreatment device.

11. The apparatus of claim 1, wherein the temperature responder comprises one of a wire and a material deposited on a surface of a channel within the aftertreatment device.

12. The apparatus of claim 1, wherein the temperature responder is formed from a material selected from the group consisting of calcium, magnesium, and aluminum.

13. The apparatus of claim 1, wherein the temperature responder is formed from a material selected from the group consisting of copper (Cu), silver (Ag), and gold (Au).

14. The apparatus of claim 1, wherein the temperature responder comprises a metal alloy.

15. The apparatus of claim 14, wherein the metal alloy comprises a eutectic metal alloy.

16. The apparatus of claim 1, wherein the aftertreatment device is one of a catalyst and a filter.

17. The apparatus of claim 1, wherein the region of interest comprises an axial position within the aftertreatment device, the axial position between about 0.3 X to about 1.0 X, wherein X represents an axial position defined such that X=0 is an upstream end of the aftertreatment device, and X=1 is a downstream side of the aftertreatment device.

18. The apparatus of claim 1, wherein the at least one temperature responder comprises a plurality of temperature responders each comprising a structure formed of a material configured to melt at a different threshold temperature, each threshold temperature corresponding to a different degradation level of the aftertreatment device.

19. A method for detecting temperature threshold events in an aftertreatment device, the method comprising:

inserting a temperature responder into a region of interest in the aftertreatment device, the temperature responder comprising a structure formed of a material configured to melt at a threshold temperature, wherein the region of interest is defined within an emissions-reducing core of the aftertreatment device;

check the temperature responder for melting after a period of operation of the aftertreatment device; and

determine whether the region of interest of the aftertreatment device has exceeded the threshold temperature based on the melting of the temperature responder.

20. The method of claim 19, wherein checking the temperature responder for melting comprises removing the temperature responder from the region of interest in the aftertreatment device and visually inspecting the temperature responder for melt indications.

21. The method of claim 19, wherein checking the temperature responder for melting comprises providing two access points electrically coupled through the temperature responder, and measuring the electrical resistance value across the two access points to determine if the temperature responder has melted.

22. A system for detecting temperature threshold events in an aftertreatment device, the system comprising:

the aftertreatment device configured to treat an exhaust gas of an internal combustion engine;

a temperature responder disposed within a region of interest of the aftertreatment device, the temperature responder comprising a structure formed of a material configured to melt at a threshold temperature, wherein the region of interest is defined within an emissions-reducing core of the aftertreatment device;

two access points, wherein the temperature responder is configured to electrically couple the two access points; and

an observation module configured to measure an electrical resistance value across the two access points, and detect the melting of the temperature responder based on the electrical resistance value across the two access points.

23. The system of claim 22, further comprising an electronic control module (ECM) comprising:

the observation module;

a thermal event module configured to determine whether the region of interest of the aftertreatment device has exceeded the threshold temperature based on the melting of the temperature responder, and to set a thermal event indicator based on the region of interest of the aftertreatment device exceeding the threshold temperature; and

a fault module configured to set a fault indicator based on the thermal event indicator.

24. The system of claim 22, further comprising a service tool comprising:

the observation module;

a thermal event module configured to determine whether the region of interest of the aftertreatment device has exceeded the threshold temperature based on the melting of the temperature responder, and to set a degradation indicator based on the region of interest of the aftertreatment device exceeding the threshold temperature; and

a display module configured to provide the degradation indicator to a display outlet.

25. The system of claim 24, further comprising:

a plurality of temperature responders, each temperature responder comprising a structure formed of a material configured to melt at a distinct threshold temperature;

two access points corresponding to each of the temperature responders, wherein each temperature responder is configured to electrically couple the two corresponding access points in parallel;

wherein the observation module is further configured to detect the melting of each temperature responder based on the electrical resistance value across the two corresponding access points; and

wherein the thermal event module is further configured to determine whether the region of interest of the aftertreatment device has exceeded each distinct threshold temperature based the melting of each temperature responder, and to set the degradation indicator based on the region of interest of the aftertreatment device exceeding each threshold temperature.