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US 11,993,275 B2Granted
Engine friction monitor
AssigneeCummins Inc.
InventorsPhanindra V. Garimella, James Ryan Hyslop, Venkatramanan Jayaraman, Pallav Pathak, Michael Justin Tammen, Patrick J. Shook, Randall J. Johnson, Travis Alva Anderson
Life of this patent
Estimating the term…
Abstract
An engine friction monitor uses commanded torque and measured torque to provide a prognostic feature to identify failure modes of an engine that causes the engine from delivering the commanded torque.
Claims20
A method, comprising:
- determining, by an engine control module, a commanded torque and a measured torque of an engine;
- determining, by an engine friction monitor, a torque error in response to a differential between the commanded torque and the measured torque, and determining, by the engine friction monitor, a slope error in response to a differential between a rate of change of the commanded torque and a rate of change of the measured torque;
- defining, by the engine friction monitor, a baseline error space based on a learned torque error and a learned slope error and establishing, by the engine friction monitor, a baseline threshold boundary within the baseline error space based on a monitoring confidence level, the baseline threshold boundary dividing the baseline error space into a first torque area below the baseline threshold boundary and a second torque area above the baseline threshold boundary;
- and
- classifying, by the engine friction monitor, torque data from the engine in the first torque area and the second torque area based on the torque error and the slope error, wherein the torque data classified in the second torque area is indicative of an engine friction condition.
2 more elements
A system for monitoring engine friction, comprising:
- an engine control module for operably controlling an engine, wherein the engine control module is configured to determine a commanded torque to the engine and a measured torque from the engine;
- an engine friction monitor that is configured to:
- determine a torque error in response to a differential between the commanded torque and the measured torque and determine a slope error in response to a differential between a rate of change of the commanded torque and a rate of change of the measured torque;
- establish a baseline threshold boundary based on a learned torque error, a learned slope error, and a monitoring confidence level, the baseline threshold boundary dividing a baseline error space into a first torque area below the baseline threshold boundary and a second torque area above the baseline threshold boundary;
- and
- classify torque data from the engine into one of the first torque area and the second torque area based on the torque error and the slope error.
3 more elements
An engine friction monitoring apparatus, comprising:
- an engine friction monitor in communication with an engine control module that operably controls an engine, wherein the engine control module is configured to determine a commanded torque to the engine and a measured torque from the engine, wherein the engine friction monitor includes:
- a torque baseliner configured to intermittently derive a monitoring confidence level from the commanded torque of the engine and the measured torque of the engine, the monitoring confidence level being based on an operational status of the engine as indicated by the commanded torque and the measured torque, and wherein the torque baseliner is further configured to intermittently derive a feedback target from the commanded torque and the measured torque;
- an error calculator configured to intermittently derive a torque error and a slope error in response to the feedback target, the torque error being a differential between the commanded torque and the measured torque, the slope error being a differential between a rate of change of the commanded torque and a rate of change of the measured torque;
- and
- a torque classifier configured to establish a monitoring threshold boundary within a monitoring error space in response to the monitoring confidence level, the monitoring threshold boundary dividing the monitoring error space into a first torque area below the monitoring threshold boundary and a second torque area above the monitoring threshold boundary, and wherein the torque classifier is further configured to classify points of torque data in one of the first and second torque areas based on the torque error and the slope error.
2 more elements
Dependencies are inferred from the claim text.