公开(公告)号：US20200049091A1

公开(公告)日：2020-02-13

申请号：US16057332

申请日：2018-08-07

Applicant: GM Global Technology Operations LLC

Inventor： Junhong Dai ,  Douglas Dickson ,  John W. Siekkinen ,  Jerry J. Sheahan ,  Jeffry A. Helmick

IPC: F02D41/14 ,  F02D41/30 ,  F02D41/26 ,  G01M15/10

Abstract: According to one or more embodiments of the technical solutions described herein, a control system in a motor vehicle that includes an internal combustion engine includes an oxygen sensor, and an oxygen sensor diagnosis module to diagnose the oxygen sensor. The oxygen sensor diagnosis includes performing an intrusive rich-to-lean diagnostic for the oxygen sensor, and detecting a lean-to-rich diagnostic event. In response, the diagnosis includes performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.