Cummins Inc.

Daniel J Smith

Michael Haas

Avra Brahma

Lyle E Kocher

Gregory H Henderson

Adam W Kidd

Jeffrey Diwakar Abraham

Christophe Tricaud

Ananth Vemuri

Krithika Mohan

Easwar Yarrabikki

Timothy J Greis

Marcela Schmalz De Bernardi

A system is configured to store a relationship data set of a plurality of diagnostic estimators and a plurality of failure modes, each failure mode represents a type of failure that can occur with a sensor or a vehicle component of a vehicle system, each diagnostic estimator is associated with a respective subset of the failure modes, each subset defines a control space within the vehicle system that contains at least one of (i) one or more sensors or (ii) one or more vehicle components. The system is configured to 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; apply the error diagnostic vector to the healthy diagnostic vector to generate a ratio diagnostic vector; and apply the ratio diagnostic vector to generate a value for each failure mode.

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

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.

Systems, apparatuses and methods for systematically executing a diagnosis and fault isolation of a failure condition for an engine during a cranking test of the engine. Examples of the failure condition include, but are not limited to, cylinder-by-cylinder compression conditions, excessive blow-by conditions, valve failures, leaks, and/or obstructions of the intake, exhausts, crankcase ventilation, and/or exhaust gas recirculation systems.

Engine health diagnosis and fault isolation with cranking test

A method () for isolating a fault within an engine system () including an engine control module () and a diagnostics module () includes determining, by the engine control module (), a plurality of parameters of the engine system (), calculating a likelihood of the fault using a log-likelihood ratio analysis of data within the engine control module (), and providing a plurality of fault determinations and the likelihood of each of the plurality of fault determinations using plurality of parameters and the diagnostics module () of the engine system ().

Method of fault isolation for systems with existing diagnostics

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Columbus, IN, United States of America

Daniel J Smith