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EP-3844373-B1 - EXHAUST SPECIES TRACKING AND NOTIFICATION SYSTEM

EP3844373B1EP 3844373 B1EP3844373 B1EP 3844373B1EP-3844373-B1

Inventors

  • BORREGARD, ROBERT C.
  • HIRT, David L.
  • MOHAMMED, HASAN
  • TANDON, Atin
  • ROBINSON, DANIEL J.
  • ISSACS, Matthew W.
  • GOLDBERGER, BENJAMIN
  • MENDOZA-PINON, Arturo
  • CARNECKI, Douglas
  • RUGGIERO, Frank

Dates

Publication Date
20260506
Application Date
20190829

Claims (15)

  1. A system comprising: an aftertreatment system (18) including a catalyst; a sensor (22) positioned to determine a catalyst health parameter, the catalyst heath parameter including an exhaust gas temperature entering the aftertreatment system; a control circuit structured to: receive the exhaust gas temperature from the sensor; decrement a catalyst health indicator when the exhaust gas temperature is at or below a decrement threshold temperature (T1), wherein the catalyst health indicator counter is indicative of the health of the catalyst; increment the catalyst health indicator when the exhaust gas temperature is at or above an increment threshold temperature (T2); and hold the catalyst health indicator constant while the exhaust gas temperature is between the decrement threshold temperature (T1) and the increment threshold temperature (T2); and a notification circuit (62) coupled to the control circuit and structured to provide a notification to an input/output device when: the catalyst health indicator is less than or equal to a health warning threshold value, or the catalyst health indicator is below a standard value for a predetermined amount of time.
  2. The system of claim 1, wherein the notification circuit provides at least one of a graphical display or an audible alarm instruction to a user to increase a load on an engine (14) associated with the system.
  3. The system of claim 1, wherein the catalyst health indicator is a calibrated value structured to track catalyst loading over time.
  4. The system of claim 1, wherein the health warning threshold is a predetermined loading limit.
  5. The system of claim 1, wherein the standard value is indicative of an amount of catalyst loading.
  6. The system of claim 1, wherein the decrement threshold temperature (T1) is less than the increment threshold temperature (T2).
  7. The system of claim 1, wherein the predetermined amount of time includes at least one of an alarm time threshold (t1) or a warning threshold time (t2).
  8. The system of claim 1, wherein decrementing the catalyst health indicator includes decrementing the catalyst health indicator at a decrement rate.
  9. The system of claim 1, wherein incrementing the catalyst health indicator includes incrementing the catalyst health indicator at an increment rate.
  10. A method, comprising: receiving a catalyst heath parameter including information indicative of a temperature within an exhaust gas aftertreatment system (18); decrementing a catalyst health indicator indicative of a health status of a catalyst in the exhaust gas aftertreatment system when the temperature is at or below a decrement threshold temperature (T1); incrementing the catalyst health indicator when the temperature is at or above an increment threshold temperature (T2); holding the catalyst health indicator constant while the temperature is between the decrement threshold temperature (T1) and the increment threshold temperature (T2); and providing a warning notification to an input/output device when the catalyst health indicator is less than or equal to a health warning threshold.
  11. The method of claim 10, further comprising logging a fault in a non-volatile memory (38) when the catalyst health indicator is below a health warning threshold.
  12. The method of claim 10, wherein the temperature within the exhaust gas aftertreatment system includes at least one of a temperature of exhaust gas entering the aftertreatment system or a catalyst temperature.
  13. The method of claim 10, wherein the decrementing is at a decrement rate based on the temperature, and wherein the incrementing is at an increment rate based on the temperature.
  14. The method of claim 10, wherein the warning notification prompts a user to increase an engine loading, or automatically controls an engine to increase engine loading.
  15. The method of claim 10, further comprising providing the warning notification when the counter (50) is below a standard value for a predetermined amount of time.

Description

RELATED APPLCIATIONS This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/725,377 filed on August 31, 2018. TECHNICAL FIELD The present disclosure relates to engine exhaust aftertreatment systems. More particularly, the present disclosure relates to systems and methods for monitoring a catalyst of an aftertreatment system. BACKGROUND Catalyst health management (CHM) systems monitor a catalyst within an aftertreatment system (e.g., a catalyst within a selective catalytic reduction system). Older engine systems and aftertreatment systems may not be equipped with a CHM system and do not include actuators that could allow a CHM system to actively reduce catalyst loading or otherwise improve catalyst health without intervention of a human operator. In some applications, an idle state or low loading state of the engine can be maintained for long periods of time. Low loading conditions can lead to increased emissions or exhaust gas species flowing through the catalyst and increase the loading of the catalyst over time. Elevated catalyst loading can lead to undesirable exothermal events that prematurely degrade the catalyst. It is desirable for the human operator to be aware of catalyst loading. US 2014/223886 describe's a method and system for diagnosing inadequate performance and or degradation of one or more components of an after treatment system. a performance degradation analysis of the oxidation catalyst is based on a comparison of measurements received from a first NOx sensor located upstream of the oxidation catalyst and a second N)x sensor located downstream from the oxidation catalyst. US2008/0104946 describes a system for triggering regeneration of an adsorber connected with a flow of exhaust from an engine. A sulphur loading estimate module is used to generate an estimated suplhur loading value associated with an adsorber. A trigger module is used to trigger a desulphation event for the adsorber, upon detection of either a cost effective trigger event, a loading trigger event or a forced trigger event. US2012/0232730 describes a system including a hybrid drive system with an internal combustion engine and a non-combustion motive power source. The system includes an energy storage system and a controller. The controller interprets duty cycle data, a boundary condition and optimization criterion. The controller further elects a load response operating condition in response to the duty cycle data, the boundary condition and the optimization criterion. The controller adjusts the operation of the engine and/or the motive power source in response to the elected load response operating condition. SUMMARY In a first aspect, the invention provides an apparatus as set out in claim 1 appended hereto. One general example relates to an apparatus that includes a circuit structured to receive information indicative of a catalyst health, determine a catalyst health management criteria has been met based on the information, determine a catalyst loading based on the information and the catalyst health management criteria being met, and compare the determined catalyst loading to a predetermined loading limit. The apparatus further includes a notification circuit coupled to the circuit, and structured to provide a notification when the determined catalyst load exceeds the predetermined loading limit. Another general example relates to a system that includes an aftertreatment system including a catalyst, a sensor positioned to measure an exhaust gas temperature entering the aftertreatment system, a control circuit, and a notification circuit. The control circuit is structured to receive the exhaust gas temperature from the sensor, decrement a catalyst health indicator indicative of a health status of the catalyst in when the exhaust gas temperature is at or below a decrement threshold temperature (T1), increment the catalyst health indicator when the exhaust gas temperature is at or above an increment threshold temperature (T2), and hold the catalyst health indicator constant while the exhaust gas temperature is between the decrement threshold temperature (T1) and the increment threshold temperature (T2). The notification circuit is coupled to the control circuit and structured to provide a notification to an input/output device when the catalyst health indicator is less than or equal to a health warning threshold, or the catalyst health indicator is below a standard value for a predetermined amount of time. Another general example relates to a method that includes receiving information indicative of a temperature within in an exhaust gas aftertreatment system, decrementing a catalyst health indicator indicative of a health status of a catalyst in the exhaust gas aftertreatment system when the temperature is at or below a decrement threshold temperature (T1), incrementing the catalyst health indicator while the temperature is at or above an increment threshold temperature (T2),