Fault isolation using on-board diagnostic (OBD) capability data

Patent metadata

Field	Value
Publication number	US-11798325-B2
Application number	US-202017247383-A
Country	US
Kind code	B2
Filing date	Dec 9, 2020
Priority date	Dec 9, 2020
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A system includes a controller configured to store a relationship matrix of a plurality of diagnostic estimators and a plurality of failure modes, each failure mode represents a type of failure that can occur with (i) a sensor or (ii) a vehicle component of a vehicle system, each diagnostic estimator is associated with a respective subset of the failure modes, each respective subset defines a control volume within the vehicle system that contains at least one of (i) one or more sensors or (ii) one or more vehicle components; store a healthy diagnostic vector regarding nominal operational parameters of the vehicle system; acquire diagnostic information regarding current operational parameters of the vehicle system to generate an error diagnostic vector; divide the error diagnostic vector by the healthy diagnostic vector to generate a ratio diagnostic vector; multiply the ratio diagnostic vector with the relationship matrix to generate a value for each failure mode.

First claim

The invention claimed is:

1. A system comprising:
a communications interface structured to communicate with one or more devices of a vehicle to facilitate acquiring diagnostic information regarding current operational parameters of a vehicle system or component of the vehicle, wherein the one or more devices include at least one of one or more sensors of the vehicle, one or more on-board diagnostic monitors of the vehicle, or a vehicle controller of the vehicle;
one or more processing circuits comprising one or more memory devices coupled to one or more processors, the one or more memory devices configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to:
store a fault isolation relationship data set of a plurality of diagnostic estimators and a plurality of failure modes, each of the plurality of failure modes represents a type of failure that can occur with (i) a sensor or (ii) a vehicle component of the vehicle system that is associated with the fault isolation relationship data set, each of the plurality of diagnostic estimators is associated with a respective subset of the plurality of failure modes, each respective subset defines a control volume within the vehicle system that contains at least one of (i) one or more sensors or (ii) one or more vehicle components of the vehicle system, wherein each control volume at least partially overlaps another control volume to define a plurality of overlapped regions;
store a healthy diagnostic vector regarding nominal operational parameters of the vehicle system when healthy;
acquire the diagnostic information regarding the current operational parameters of the vehicle system via the communications interface;
generate an error diagnostic vector based on the diagnostic information;
apply the error diagnostic vector to the healthy diagnostic vector to generate a ratio diagnostic vector;
apply the ratio diagnostic vector to the fault isolation relationship data set to generate a value for each of the plurality of failure modes; and
sort the plurality of failure modes based on the value for each of the plurality of failure modes to facilitate identifying which of the plurality of failure modes are most likely to cause a fault within the vehicle system.

2. The system of claim 1 , wherein the type of failure for each of the plurality of failure modes includes a sensor failure, an actuator failure, or a static component failure.

3. The system of claim 1 , wherein the fault is likely caused by a respective component or a respective sensor positioned within a respective overlapped region of the plurality of overlapped regions that has control volumes associated therewith that are all drifting from the nominal operational parameters associated with the control volumes of the respective overlapped region.

4. The system of claim 1 , wherein the one or more memory devices are further configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to provide an alert via the communications interface to at least one of a display of the vehicle, a display of a service tool, or a server indicating which of the plurality of failure modes are most likely to cause the fault within the vehicle system.

5. The system of claim 1 , wherein the one or more processing circuits are at least one of (i) positioned in the vehicle in the vehicle controller, (ii) positioned remote from the vehicle in a server, or (iii) positioned remote from the vehicle in a service tool.

6. The system of claim 1 , wherein the vehicle system includes at least three or more of an intake system, an engine system, an exhaust system, an exhaust gas recirculation system, and a variable geometry turbo system.

7. A system comprising:
a communications interface structured to communicate with one or more devices of a vehicle, wherein the one or more devices include at least one of (i) a plurality of on-board diagnostic (OBD) monitors of the vehicle that are associated with a vehicle system of the vehicle or (ii) a vehicle controller of the vehicle in communication with the plurality of OBD monitors;
one or more processing circuits comprising one or more memory devices coupled to one or more processors, the one or more memory devices configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to:
acquire OBD capability data from the one or more devices via the communications interface, wherein the OBD capability data includes at least (i) first OBD capability data acquired from a first OBD monitor associated with a first plurality of components or a first portion of the vehicle system, (ii) second OBD capability data acquired from a second OBD monitor associated with a second plurality of components or a second portion of the vehicle system, and (iii) third OBD capability data acquired from a third OBD monitor associated with a third plurality of components or a third portion of the vehicle system, wherein (i) the first plurality of components and the second plurality of components include a first common component or (ii) the first portion and the second portion at least partially overlap, and wherein (i) the first plurality of components and the third plurality of components include a second common component or (ii) the first portion and the third portion at least partially overlap;
compare the first OBD capability data, the second OBD capability data, and the third OBD capability data;
identify a faulty component or a faulty portion of the vehicle system based on the comparison; and
provide an alert indicating the faulty component or the faulty portion of the vehicle system via the communications interface to at least one of a display of the vehicle, a display of a service tool, or a server.

8. The system of claim 7 , wherein the faulty component or the faulty portion of the vehicle system is determined to be the first common component or the overlap between the first portion and the second portion in response to the first OBD capability data and the second OBD capability data each indicating a greater value than the third OBD capability data, and wherein the faulty component or the faulty portion of the vehicle system is determined to be the second common component or the overlap between the first portion and the third portion in response to the first OBD capability data and the third OBD capability data each indicating a greater value than the second OBD capability data.

9. The system of claim 7 , wherein (i) the second plurality of components and the third plurality of components include a third common component or (ii) the second portion and the third portion at least partially overlap.

10. The system of claim 7 , wherein the one or more memory devices are further configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to acquire the OBD capability data from the plurality of OBD monitors in response to at least one of the plurality of OBD monitors indicating that a fault is present in the vehicle system.

11. The system of claim 7 , wherein the one or more processing circuits are at least one of (i) positioned in the vehicle in the vehicle controller, (ii) positioned remote from the vehicle in a server, or (iii) positioned remote from the vehicle in a service tool.

12. The system of claim 7 , further comprising at least one of the plurality of OBD monitors or the vehicle system.

13. A system comprising:
a communications interface structured to communicate with one or more devices of a vehicle to facilitat

Assignees

• Cummins Inc

Inventors

• Abraham Jeffrey Diwakar
• Schmalz De Bernardi Marcela
• Brahma Avra
• Greis Timothy J
• Haas Michael
• Henderson Gregory H
• Kidd Adam W
• Kocher Lyle E
• Mohan Krithika
• Smith Daniel J
• Tricaud Christophe
• Vemuri Ananth
• Yarrabikki Easwar

Classifications

• G07C5/0808 Primary

  Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005) · CPC title

• B60R16/0234

  related to maintenance or repairing of vehicles · CPC title

• F02B37/24

  by using pumps or turbines with adjustable guide vanes · CPC title

• F02M26/02 Primary

  EGR systems specially adapted for supercharged engines · CPC title

• F02M35/10222

  Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission · CPC title