Caterpillar Inc.

Wade D Scrivner

Mary Lou Kesse

Amit Jayachandran

Michael S Lukich

Charles D Ellenbecker

Zhiyong Wei

Liangtao Zhu

Gregory D Brock

Frederick M Estes

Chris L Wynkoop

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

An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, and a reduction catalyst disposed within the exhaust passageway. The exhaust system may also have a first sensor located to generate a first signal indicative of an operational parameter of the reduction catalyst, and a second sensor located to generate a second signal indicative of a performance parameter of the reduction catalyst. The exhaust system may further have an injection device located to inject reductant upstream of the reduction catalyst, and a controller in communication with the combustion engine, the first sensor, the second sensor, and the injection device. The controller may be configured to determine a NOproduction of the combustion engine, determine an amount of reductant that should be injected based on the NOproduction and the first signal, and adjust the amount based on the second signal.

Exhaust system implementing feedforward and feedback control

A fuel injector assembly for use in an electrically-controlled engine having a fuel injector and an electrical adapter. The fuel injector has a first set of electrical connectors and a second set of electrical connectors. The electrical adapter has a body, a first set of electrical receptacles, a second set of electrical receptacles, and a plug interface. The first set of electrical receptacles are electrically connectable with the first set of electrical connectors. The second set of electrical receptacles are electrically connectable with the second set of electrical connectors. The plug interface has a first set of electrical contacts electrically connected to the first set of electrical receptacles. The plug interface also has a second set of electrical contacts electrically connected to the second set of electrical receptacles.

Electrical adapter for a fuel injector with two sets of connectors

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Washington, IL, United States of America

Wade D Scrivner