Caterpillar Inc.

Jun Cai

Dereck Glenn Heffron

Deepashri Vinayak Phatak

Ashwin Ashok Hattiangadi

Purna Chander Nalla

Brian V Tranel

Shivsinh Hitendrasinh Parmar

Johnathan Wingate Trundt

Leo Chuzhoy

Adrian Vasile Catalina

Operating an engine exhaust aftertreatment system includes receiving fluid pressure data of a reductant pump, determining a pump operating state, and comparing a pump health parameter to a prognostic pump failure criterion based upon the determining a pump operating state. Operating an engine exhaust aftertreatment system further includes outputting a pump health alert based upon a difference between the pump health parameter and the prognostic pump failure criterion. Related control logic is also disclosed.

Prognostic alert strategy for reductant pump in exhaust aftertreatment system for engine

An emissions sensor health monitor can acquire nitrogen oxide (NOx)-in values measured by an input emissions sensor of the machine and NOx-out values measured by an output emissions sensor of the machine. The emissions sensor health monitor can identify samples of the machine channel data that meet criteria associated with an idle operating condition of an engine of the machine, and determine NOx delta values for the samples. The emissions sensor health monitor can determine that the NOx delta values are above a preset acceptable threshold for at least a threshold time period, and in response perform one or more responsive actions.

Detection of failing emissions sensors

A control system is provided to a reductant dosing system for actively maintaining the reductant dosing system ready for use by flushing unused reductant that has crystallized at a return valve of the reductant dosing system. The control system includes a controller that can control a manner of operation of specific system hardware that is present in the reductant dosing system to flush the unused reductant from the return valve that could otherwise cause the return valve to remain a flow-blocking condition as a result of the crystallized reductant.

Control system for a reductant dosing system

A method of forming gray iron components includes applying a substantially uniform magnetic field to gray iron. The method also includes heat-treating the gray iron while the gray iron is within the magnetic field.

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Dunlap, IL, United States of America

Jun Cai