Caterpillar Inc.

Cho Y Liang

Steven R McCoy

Matthew J Alger

Mari Lou Balmer-Millar

Edward J Woods

Dennis D Feucht

Gerald N Coleman

Evan Earl Jacobson

Gregory Jerome Kaufmann

Brett M Bailey

Keith Edward Lawrence

Michael Patrick Harmon

John Parker Timmons

Cornelius Nicolae Opris

Richard W Kruiswyk

Zhiyong Wei

Anil Raina

Noel R Lepp

Todd A Davis

Syamaia Srinivasan

An emissions control system is disclosed. The emissions control system may have an SCR device that receives a flow of exhaust. The emissions control system may also have an injector that introduces a reduction agent into the flow of exhaust at or upstream of a catalyst within the SCR device. The emissions control system may have a controller in communication with the injector, the controller being configured to calculate a first amount of the reduction agent by using an approximation that at least one of a plurality of SCR reactions must be completed before the remaining SCR reactions commence. The controller may also be configured to adjust the injector according to at least the first amount.

SCR emissions control system

A regeneration assembly includes a first portion including a combustion chamber connected to a combustor head. The regeneration assembly also includes a second portion including a housing. The first portion is removably connectable to the second portion.

Regeneration assembly

A power generation system includes a power module and an external process module. The external process module may include at least one engine support element. The power module has at least one connection zone, and the external process module has at least one connection zone that is configured to align with the at least one connection zone of the power module. The aligned connection zones of the power module and the external process module permit relatively quick and inexpensive attachment of the external process module to the power module. The at least one engine support element may be an aftertreatment element.

Power generation system having an external process module

An exhaust treatment system of a power source includes a filter having a housing with an inlet and an outlet, and a regeneration device disposed outside of the housing of the filter. The regeneration device is fluidly connected to the inlet of the housing. The exhaust treatment system also includes an exhaust line configured to assist in directing a portion of a filtered flow of exhaust from the filter outlet to the power source.

Exhaust treatment system

A power generation system has a power source and an aftertreatment system connected to the power source. The aftertreatment system is adapted to treat an exhaust of the power source. The aftertreatment system has a particulate filter that is dimensioned to be interchangeable with a muffler.

Power generation aftertreatment system having a particulate filter dimensioned to be interchangeable with a muffler

A method and system may be provided to perform a process for controlling NOemissions of an target engine. In one embodiment of the invention, the process may include determining predicted NOvalues based on a model reflecting a predetermined relationship between control parameters and NOemissions, wherein the control parameters include ambient humidity, manifold pressure, manifold temperature, fuel rate, and engine speed associated with the engine. Further, the process may include adjusting the model based on a determination of whether the predicted NOvalues meet a predetermined criteria associated with actual NOvalues. The adjusted model may be stored in a memory associated with the engine whereby NOemissions exhausted from the engine may be reduced based on virtual NOemission values determined from the adjusted model.

NOx emission-control system using a virtual sensor

An emissions control system is used with a compression ignition engine capable of producing an exhaust gas stream to be treated by a reduction agent which is mixed with the exhaust gas stream to convert the exhaust gas stream prior to being directed into an SCR catalyst capable of reducing NOx in the exhaust gas stream. An exhaust gas recirculation valve is associated with the compression ignition engine for directing the exhaust gas stream back into the compression ignition engine. An electronic control unit and sensors determine whether the temperature of the exhaust gas stream is at a predetermined temperature, and if so control operation of the valve to allow a portion of the exhaust gas stream to be directed into the SCR catalyst. A bypass valve may also be provided to prevent the exhaust gas stream from entering into the SCR catalyst.

Emissions control system for increasing selective catalytic reduction efficiency

A method and apparatus for the treatment of blow-by gas from a crankcase of an internal combustion engine. A particle and droplet filter removes at least some of any particles or droplets in the gaseous stream. The filtered gaseous stream is passed through a primary heat exchanger, and a catalyzed soot filter downstream of the primary heat exchanger. A secondary heat exchanger may be used to heat the gaseous stream with exhaust gas from the internal combustion engine. Blow-by gases are cleaned for subsequent discharge to the ambient environment, or for reintroduction to the fuel system of the engine.

Crankcase blow-by filtration system

An internal combustion engine system, particularly suitable for a motor vehicle, is provided with an intake manifold, an exhaust manifold and an exhaust gas recirculation rate control system fluidly connected to the exhaust manifold and to the intake manifold. The exhaust gas recirculation rate control system includes at least two critical-flow nozzles, each critical-flow nozzle having an intake end and output end, the intake ends being fluidly coupled to the exhaust manifold; at least one valve, each valve being fluidly coupled with at least one output end; and a control module operatively connected to each valve for controlling exhaust gas flow therethrough. Some advantages of such a system is that the exhaust gas recirculation is accurately provided with an &ldquo;open-loop&rdquo; control system, thereby avoiding the use of a feedback system; the flow can be accurately determined under a choked-flow operating conditions; and the system can readily handle different exhaust gas flow rates.

Internal combustion engine with an exhaust gas recirculation system

An emissions diagnostic system is used with a compression ignition engine having an exhaust gas stream directed into an SCR catalyst capable of reducing NO in the exhaust gas stream. The system comprises a tank for storing a solution of urea, a pump in fluid communication with the tank for drawing the solution of urea from the tank, a valve in fluid communication with the pump and the exhaust gas stream for receiving the solution of urea from the pump, an air pump connected to the valve for providing air into the valve for mixing with the solution of urea, the valve for spraying the solution of urea into the exhaust gas stream, a sensor for sensing the level of NO emissions emitted by the SCR catalyst, and a control module connected to the sensor for determining whether the level of NO emissions is at an acceptable level.

Emissions diagnostic system

A selective catalytic reduction emissions control includes a NO,-reducing reagent stored in a vessel. The system includes apparatus and a method for determining when the vessel is empty or when the vessel is filled with a substance other than an acceptable NO,-reducing reagent.

Diagnostic system for an emissions control on an engine

An exhaust gas recirculation (EGR) system for a turbo-charged internal combustion engine is provided. The EGR system includes a recirculation conduit for recirculating a volume of exhaust gas from the exhaust manifold to the intake manifold; a cooling air conduit for transporting a flow of cooling air; and a gas-to-air heat exchanger disposed in operative association with the recirculation conduit and the cooling air conduit and adapted for cooling the volume of recirculated exhaust gas in the recirculation conduit. The cooling air passing through the gas-to air heat exchanger can be diverted from the pressurized intake air, cooled (ATAAC) air, or even fresh ambient air obtained from a source external to said engine and which optionally may be forcibly directed through the heat exchanger via a blower. The disclosed embodiments disclose EGR systems where the exhaust gases are driven from the exhaust manifold to the intake manifold through different techniques including peak clipping EGR systems, venturi based EGR systems, pumped EGR systems or piston pumped EGR systems.

Exhaust gas recirculation system

A control system for an internal combustion engine and an associated pressure wave supercharger, which optimizes exhaust emissions and engine performance by automatically switching the mode of control between a cold start and white smoke mode, an altitude dependent mode, a low emissions mode, a fuel economy mode, and a particulate trap regeneration mode as the operating conditions of the engine change.

Control system for pressure wave supercharger to optimize emissions and

A hydraulic drive system for a pressure wave supercharger having a circular array of elongated chambers disposed to form a rotor rotatably disposed in a housing, the pressure wave supercharger being cooperatively associated with an internal combustion engine, and the hydraulic drive system comprising at least one hydraulic pump, a hydraulic motor driven by hydraulic fluid supplied by the hydraulic pump and coupled to the rotor and a control valve for regulating the speed of the hydraulic motor and the rotor to synchronize the pressure wave action within the elongated chambers of the rotor and supply combustion air to the engine at the proper volume and density at various operating conditions.

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West Lafayette, IN, United States of America

Cho Y Liang