Caterpillar Inc.

Brian Michael Cole

Kevin Lloyd Dea

Theron James Cassidy

Johnathan Wingate Trundt

Bryan Edward Nelson

Umakanth Sakaray

Jason Hudgens

Matthew Fahrenkrug

Thomas Reilly Fenelon

Darin James McCoy

Keith Daniel Hogan

Wayne Davey

Dirk DeDecker

Daniel Robert Wentzel

Sanket Yeole

A reductant delivery system includes an electronic control unit coupled with each of an electronically controlled reductant injector and an electronically controlled pump, and structured to mitigate obstruction of a reductant injector in an exhaust system of an engine. The electronic control unit is further structured to receive data indicative of a pump duty cycle, and calculate a diagnostic value based on pump duty cycle associated with injection of different amounts of reductant, compare the diagnostic value with a threshold value, and output an error signal to trigger an obstructed-injector mitigation action.

Diagnostic and mitigation strategy for reductant injector obstruction in exhaust system

A reductant supply system for an exhaust aftertreatment system is disclosed. The reductant supply system may include a controller configured to receive an engine system operation signal and transmit a reductant delivery signal in response to the engine system operation signal, an injector configured to dispense a reductant fluid into an exhaust gas flow of the exhaust aftertreatment system in response to the reductant delivery signal, and a pump configured to actuate between an off condition and an on condition in response to the reductant delivery signal. Furthermore, the reductant supply system may include a recycle line and a two-way valve positioned in the recycle line configured to actuate between a closed position and an open position in response to the reductant delivery signal.

Reductant supply system

A method for purging a reductant supply system for an engine is provided. The reductant supply system includes a reservoir to store a reductant. The reductant supply system further includes an injector to inject reductant in an exhaust conduit of the engine. The reductant supply system also includes a conduit coupled between the reservoir and the injector to supply the reductant. The method for purging the reductant supply system includes initiating purging of the injector and the conduit such that the reductant in the injector and conduit flows to the reservoir. The method further includes monitoring of the dilution of the reductant during purging and indicating a completion of the purging when the dilution of the reductant in the reservoir reaches a threshold value.

Reductant supply system for engine

An insulated reductant tank that is arranged so that it has an insulated upper portion and a tapered lower portion, the reductant tank configured to allow frozen reductant to move into the insulated upper portion and reduce the damage that frozen reductant can cause to a reductant tank when the frozen reductant expands. The insulated reductant tank can include at least one header configured to draw reductant from the reductant tank and supply the reductant to an exhaust aftertreatment system, an insulation layer lining an upper portion of the reductant tank, a tapered lower portion, and at least one baffle configured to control a flow of reductant.

Insulated reductant tank

An aftertreatment system is provided for an engine. The aftertreatment system may have at least one exhaust passage and a plurality of reductant injectors that are controllable to dose reductant into the at least one exhaust passage. The aftertreatment system may also have at least one sensor configured to generate a signal indicative of an exhaust parameter and a controller in communication with each of the plurality of reductant injectors and the sensor. The controller may be configured to dynamically adjust the dosing of the plurality of injectors, wherein adjusting the dosing includes adjusting at least one of an injector timing, an injector sequence, and a grouping of the plurality of injectors that are simultaneously injecting based on the signal.

Aftertreatment system having dynamic independent injector control

A dosing system for dosing diesel exhaust fluid (DEF) into an inlet of a selective catalytic reduction (SCR) aftertreatment module of a diesel engine is described. The dosing system may comprise a DEF supply line configured to deliver the DEF from a pump to a first injector and a second injector at the inlet. The DEF supply line may include a tri-axis connector configured to split the DEF from the pump into two portions each exiting one of a first outlet port and a second outlet port, a first delivery conduit configured to deliver the DEF exiting the first outlet port to the first injector, and a second delivery conduit configured to deliver the DEF exiting the second outlet port to the second injector. The first injector and the second injector may dose the same quantity of the DEF into the inlet of the aftertreatment module.

Diesel exhaust fluid dosing system for diesel engine aftertreatment module

A reductant supply system includes a reductant tank, an injector supply conduit fluidly connecting the reductant tank with an injector, a driving fluid source in fluid communication with the reductant tank via a dose driving conduit, a purge conduit in fluid communication with the driving fluid source and the reductant tank, and a valve in fluid communication with the reductant tank via the dose driving conduit and the purge conduit.

A reductant dosing system for an engine is disclosed. The disclosed reductant dosing system includes a reservoir of reductant fluid that is connected to an inlet of a reductant pump. The pump has an outlet that is fluidly connected to the reservoir, an inlet of a pressure regulator and an inlet of an injector. The pressure regulator includes a reductant pressure control valve that fluidly connects the outlet of the reductant pump to the reservoir when the reductant pressure control valve is in an open position. A compressed gas source is fluidly connected to an air supply control valve that fluidly connects the compressed gas source to the reservoir when the air supply control valve is in an open position. The air supply control valve also has a closed position and is shifted between the open and closed positions by a controller.

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Peoria, IL, United States of America

Brian Michael Cole