US 12,441,295 B2
System and methods for in-use NOx robustness emission control
Chris Polonowski, Brighton, MI (US); Kyle Pohlkamp, Waunakee, WI (US); Eric Kurtz, Dearborn, MI (US); and Paul J. Tennison, West Bloomfield, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Mar. 30, 2023, as Appl. No. 18/192,907.
Prior Publication US 2024/0326778 A1, Oct. 3, 2024
Int. Cl. B60W 20/16 (2016.01); B60W 10/04 (2006.01); B60W 10/24 (2006.01); B60W 50/00 (2006.01)
CPC B60W 20/16 (2016.01) [B60W 10/04 (2013.01); B60W 10/24 (2013.01); B60W 50/0097 (2013.01); B60W 2050/0026 (2013.01); B60W 2400/00 (2013.01); B60W 2510/06 (2013.01); B60W 2556/10 (2020.02)] 19 Claims
OG exemplary drawing
 
1. A method for a controller of a vehicle, the method comprising:
adjusting an operating parameter of an engine of the vehicle in response to a margin between a moving average tailpipe NOx emissions and a threshold tailpipe NOx emissions decreasing below a threshold tailpipe NOx margin, the moving average tailpipe NOx emissions calculated at regular intervals over a plurality of overlapping moving average windows (MAWs) of measured tailpipe NOx emissions;
wherein adjusting the operating parameter further comprises one or more of:
during a motored negative acceleration of the vehicle, opening a throttle disposed at an intake passage of the engine, and closing an exhaust gas regeneration (EGR) valve of an EGR system of the engine;
restricting a tip-in response of the vehicle to reduce increases in engine-out NOx;
increasing an EGR flow rate of the engine to reduce engine-out NOx;
increasing a heat transfer from engine-out exhaust gases to a coolant at a charge air cooler and/or EGR cooler of the vehicle to reduce catalyst temperatures;
increasing transmission shift speed points to reduce brake-specific NOx emissions and/or reduce catalyst temperatures;
adjusting a torque derating curve to degrade a performance of the engine; and
switching to an engine operation mode (EOM) that reduces engine-out NOx.