US 12,247,504 B1
Systems and methods for catalyst health diagnosing and fuel system control improvement
Chengke Liu, Novi, MI (US); Rafat F. Hattar, Royal Oak, MI (US); Janean Ellen Potter, Northville, MI (US); and Erika L Pruski, Brighton, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Sep. 20, 2023, as Appl. No. 18/470,835.
Int. Cl. F01N 11/00 (2006.01); F01N 3/10 (2006.01); F02D 41/14 (2006.01)
CPC F01N 11/007 (2013.01) [F01N 3/101 (2013.01); F02D 41/1461 (2013.01); F01N 2560/021 (2013.01); F01N 2560/023 (2013.01); F01N 2560/025 (2013.01); F01N 2560/026 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An exhaust system for a vehicle comprising:
an engine;
a three-way catalytic converter including a first catalyst and a second catalyst;
a tailpipe adjacent to the three-way catalytic converter;
a first oxygen sensor disposed between the engine and the catalytic converter;
a second oxygen sensor disposed in the three-way catalytic converter;
a nitrogen oxides (NOx) sensor disposed in the tailpipe; and
an engine control module (ECM) configured to obtain first oxygen sensor data from the first oxygen sensor, second oxygen sensor data from the second oxygen sensor, and NOx sensor data from the NOx sensor, the ECM being configured to perform catalyst health diagnostic operations and closed loop fuel control adjustment operations to adjust one or more characteristics of the exhaust system based on at least the first oxygen sensor data, the second oxygen sensor data, and the NOx sensor data.