Caterpillar Inc.

Matthew Colin Mowers

Joshua Lynn Ratts

Daniel Reese Puckett

Evan Earl Jacobson

Travis E Barnes

Jason Kenneth Bloms

Eric Wade Cler

Eric D Stemler

Kevin J Sergott

Eric A Hutchison

Andrew Nathan Schifferer

Karthik Jayasankaran

Anand Krishnamurthygopalan

Tyler V Richards

Urvish Joshi

Sowmya Nagesh

Hrishi Lalit Shah

Tyler Bowman

Aaron Harmon

Kirti Tamhane

Deepti Bhosekar

An aftertreatment system for a diesel engine may include a diesel particulate filter configured for placement in fluid communication with the diesel engine to receive an exhaust flow. The system may also include a selective catalytic reduction system configured for arrangement downstream of the diesel particulate filter and a NOsensor configured to measure a NOconcentration in the exhaust flow entering the selective catalytic reduction system. The system may also include a controller configured to estimate a ratio of NOto NOdownstream of the diesel particulate filter and based on a factor affecting the generation of NOupstream of the selective catalytic reduction system. The controller may also be configured to adjust the measured NOconcentration based on the ratio to provide an estimated actual NOconcentration and dose diesel exhaust fuel into the exhaust flow based on the estimated actual NOconcentration.

Aftertreatment system

A method for operating an internal combustion engine includes monitoring engine parameters using an electronic controller, determining a surge speed limit for the engine based on a compressor map, determining an offset engine speed based on a margin between the surge speed limit and an engine speed, determining a minimum engine speed based on the margin, applying the offset engine speed to an engine speed signal to provide an adjusted engine speed, and applying the adjusted engine speed to a desired engine speed when a speed of the engine approaches the surge speed limit.

Turbocharger compressor anti-surge engine control strategy and method

An emissions control system includes a Selective Catalytic Reduction (SCR) device, one or more monitoring devices and one or more sensors. The system further includes a controller configured to determine an operating emissions gas conversion ratio of the SCR device. The controller is further configured to determine an injection amount of a reduction agent to maintain an operating emissions gas conversion ratio of the SCR device and to adjust the operating emissions gas conversion ratio to a target emissions gas conversion ratio by adjusting the injection amount of the reduction agent to the SCR device. The system utilizes a Time-Temperature model to determine the target emissions gas conversion ratio and/or reduction agent injection ratio. The system further includes a reduction agent injector configured to supply the adjusted injection amount of the reduction agent to the SCR device.

Adaptive catalytic conversion and reduction agent control

A machine () has an internal combustion engine () operating in response to a control signal provided by an engine governor (). The engine () provides a torque output to a machine system providing a machine function. An electronic controller () determines a current operating state of the engine () and a torque utilization of the machine system, and compares the current operating state of the engine () with the torque utilization in an engine droop function (). A change to an engine speed () setting of the engine () is instructed in response to a change in the torque signal. Such change is to increase the engine speed () setting when the torque utilization is increasing, and to decrease the engine speed () setting when the torque utilization is decreasing.

Engine droop governor and method

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Peoria, IL, United States of America

Matthew Colin Mowers