09157390 is referenced by 2 patents and cites 112 patents.

A system for a vehicle includes a first exhaust gas flow rate (EGF) estimation module, a second EGF estimation module, and an EGF fault detection module. The first EGF estimation module estimates a first flow rate of exhaust re-circulated back to an intake manifold based on a concentration of oxygen in the intake manifold. The second EGF estimation module estimates a second flow rate of exhaust re-circulated back to the intake manifold based on an engine speed and an engine load. The EGF fault detection module selectively indicates a fault is present in an exhaust gas recirculation (EGR) system based on the first flow rate and the second flow rate.

Title
Selective exhaust gas recirculation diagnostic systems and methods
Application Number
13/238460
Publication Number
9157390 (B2)
Application Date
September 21, 2011
Publication Date
October 13, 2015
Inventor
Darrell W Burleigh
South Lyon
MI, US
Vijay Ramappan
Novi
MI, US
B Jerry Song
Novi
MI, US
Assignee
GM Global Technology Operations
MI, US
IPC
F02M 25/07
F02D 41/14
F02D 41/00
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