Patent ID: 11933211
Assignee: CATERPILLAR INC.
Field: Environmental technology (Chemistry)
Classification: CPC F  G  Y | IPC F  G

Claim 0:
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.