US 11,933,211 B2
Prognostic alert strategy for reductant pump in exhaust aftertreatment system for engine
Deepashri Phatak, Peoria, IL (US); Dereck G Heffron, Peoria, IL (US); and Jun Cai, Dunlap, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Dec. 16, 2021, as Appl. No. 17/552,636.
Prior Publication US 2023/0193802 A1, Jun. 22, 2023
Int. Cl. F01N 3/20 (2006.01); F04B 49/06 (2006.01); F04B 51/00 (2006.01); G05B 23/02 (2006.01)
CPC F01N 3/2066 (2013.01) [F01N 2550/05 (2013.01); F01N 2590/08 (2013.01); F01N 2610/1433 (2013.01); F01N 2900/1808 (2013.01); F01N 2900/1822 (2013.01); F04B 49/065 (2013.01); F04B 51/00 (2013.01); F04B 2205/05 (2013.01); G05B 23/0221 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an exhaust aftertreatment system for an engine comprising:
receiving fluid pressure data of a reductant pump in an exhaust aftertreatment system for an engine;
operating the reductant pump in a first operating state;
operating the reductant pump in a second operating state;
determining which one of the first pump operating state or the second pump operating state the reductant pump is presently operating in;
comparing a pump health parameter indicated by the fluid pressure data to one of a first prognostic pump failure criterion associated with a first failure mode of the reductant pump or a second prognostic pump failure criterion associated with a second failure mode of the reductant pump, based upon the determining which one of the first pump operating state or the second pump operating state the reductant pump is presently operating in; and
outputting a pump health alert based upon a difference between the pump health parameter and the respective one of the first prognostic pump failure criterion and the second prognostic pump failure criterion.