公开(公告)号：US10152834B1

公开(公告)日：2018-12-11

申请号：US15685336

申请日：2017-08-24

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chaitanya Sankavaram ,  Shiming Duan ,  Layne Wiggins ,  Stephen Levijoki ,  Dean Sorrell ,  Todar Kuzmanov

IPC: F23D11/38 ,  G07C5/08 ,  F01P1/02 ,  F02D9/02

Abstract: A method of conducting prognosis for an airflow management system for a combustion engine includes adjusting a throttle body valve position control signal in response to a detected airflow variation and monitoring an airflow variation compensation (AVC) value corresponding to a degree of adjustment of the control signal. The method also includes generating a throttle body coking severity metric based on at least a plurality of residual error values and the AVC value, and executing at least one response action based on the throttle body coking severity metric exceeding a predetermined threshold.