Caterpillar Inc.

Progress Rail Locomotive Inc.

Liangtao Zhu

Eric Lee Schroeder

Mary Lou Kesse

Arvind Sivasubramanian

Travis E Barnes

Michael B Goetzke

Craig Phillip Hittle

Amit Jayachandran

Jeremy Byrd

Kevin J Sergott

Zhiyong Wei

Shivangi Wagle

Steven Dallas Johnson

Ryan Thomas Sunley

Aaron L Robinson

Wade D Scrivner

Reddy P S Sankara

A method for controlling and engine system with a plurality of turbochargers. At least one of the plurality of turbochargers has a turbine valve, a compressor valve, and actuators operable to change the position of the turbine valve. The method comprises controlling the actuator based on the presence of a transient event or a steady state event. During a transient event an engine control module can control the actuators to change the turbine valve to opened and closed positions and the turbine valve to a closed position based on the comparison between a corrected mass flow per turbocharger to a mass flow threshold.

Method for sequential turbo control

An internal combustion engine having an exhaust log structure onto which a plurality of turbochargers is connected, each turbocharger having a turbine connected to the exhaust log structure and having an inlet fluidly connectable to a respective one of the plurality of outlet ports, an exhaust valve disposed at a turbine outlet such that the flow of exhaust gas out of the turbine is fluidly blocked, and an actuator associated with the exhaust valve and operating to move the exhaust valve from a closed position to an open position and vice versa. An electronic controller provides a command to the actuator to move the exhaust valve between the open and closed positions and is programmed to selectively open two one or more exhaust valves based on an operating condition of the engine.

Inline turbocharger arrangement and method

According to one aspect of the present disclosure, a method of controlling an exhaust gas recirculation (EGR) system of an engine system includes determining a first EGR command according to a first method during a steady state engine condition, determining a second EGR command according to a second method during a transient engine condition, wherein the first method is based at least in part on values from a NOx sensor, and the second method is not based on values from a NOx sensor. The method further includes adjusting an EGR valve of the EGR system based on the first EGR command during the steady state engine condition, and adjusting the EGR valve based on the second EGR command during the transient engine condition.

Systems and methods for controlling EGR flow rate

An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, a reduction catalyst, a reductant injector, and a controller. The controller may have a NO/reductant relationship map, and be configured to receive a first input relating to an amount of NOwithin the exhaust passageway upstream of the reduction catalyst, and reference the NO/reductant relationship map to determine an initial amount of reductant that should be directed into the exhaust passageway based on the first input. The controller may also be configured to receive a second input relating to performance of the reduction catalyst, determine an adjustment to the initial amount of reductant based on the second input, and regulate operation of the reductant injector to direct an adjusted amount of reductant into the exhaust passageway. The controller may further be configured to update the NO/reductant relationship map based on the determined adjustment.

Exhaust system implementing in situ calibration

An engine system includes an integrated engine and aftertreatment control system via an electronic aftertreatment controller that is in communication with the electronic engine controller. An aftertreatment control algorithm is operable to generate an exhaust control signal and a reductant dosing control signal. The dosing control signal is used to control a flow rate of a reductant (e.g. urea) injection rate into the exhaust system for facilitating a reduction reaction with NOx in the exhaust flow at a suitable downstream catalyst location. The exhaust control signal is communicated to the electronic engine controller, which responds by altering engine operation to change some aspect of the engine exhaust. In one specific example, an ammonia slip event precondition is detected by the electronic aftertreatment controller, and an exhaust control signal in the form of an increase NOx request is communicated to the engine controller, which responds by altering engine operation to increase NOx output in the hopes of preempting the expected ammonia slip event prior to its actual occurrence to maintain undesirable emissions low at the tailpipe.

Integrated engine and exhaust after treatment system and method of operating same

Growing community of inventors

Dunlap, IL, United States of America

Liangtao Zhu