US 11,993,275 B2
Engine friction monitor
Phanindra V. Garimella, Bloomington, IN (US); James Ryan Hyslop, Columbus, IN (US); Venkatramanan Jayaraman, Greenwood, IN (US); Pallav Pathak, Columbus, IN (US); Michael Justin Tammen, Greenwood, IN (US); Patrick J. Shook, Franklin, IN (US); Randall J. Johnson, Columbus, IN (US); and Travis Alva Anderson, Columbus, IN (US)
Assigned to Cummins Inc., Columbus, IN (US)
Filed by Cummins Inc., Columbus, IN (US)
Filed on Sep. 21, 2020, as Appl. No. 17/026,699.
Application 17/026,699 is a continuation of application No. PCT/US2019/025385, filed on Apr. 2, 2019.
Claims priority of provisional application 62/651,469, filed on Apr. 2, 2018.
Prior Publication US 2021/0001871 A1, Jan. 7, 2021
Int. Cl. B60W 50/038 (2012.01); B60W 20/50 (2016.01)
CPC B60W 50/038 (2013.01) [B60W 20/50 (2013.01); B60W 2710/083 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.