Caterpillar Inc.

Michael A Flinn

Lianghe Zuo

Fred A Camplin

Scott F Shafer

James Joshua Driscoll

Thomas G Ausman

Chetan J Desai

Jerry A Wear

Jeffrey D Graves

John G Ertel

Systems and methods for treating exhaust gases are described. The described systems and/or methods for treating exhaust gases could be used with any power plant, engine, hydrocarbon burning system, other NOproducing system, or combinations thereof. A method () for treating exhaust gases is provided. The method () may include converting () ammonia () and NOto nitrogen and water using an ammonia-SCR catalyst () after converting () ammonia to NOusing an ammonia-to-NOcatalyst () located upstream of at least a portion of the ammonia-SCR catalyst (). The described systems and/or methods create NOso excess ammonia added to the exhaust stream may be used to convert NOto nitrogen and water.

System and method for treating exhaust gases

A fuel injector comprises a barrel, a plunger, and a port. The plunger is disposed in a bore in the barrel such that it intersects the port disposed in the barrel. The plunger has an injection rate shaping device and a cavitation control device disposed therein. The pressure control device is in such a position on the plunger such that subsequent to the rate shaping device passing fluidly communicating with the port, the cavitation control device aligns with the port to control the pressure wave propagated through the port by the termination of rate shaping.

Unit injector having a cavitation pressure control mechanism

A multipiece fuel pump plunger assembly for controlling the fuel injection rate and delivery during the initial injection portion of a fuel injection cycle for an internal combustion engine. The injector includes a two piece plunger assembly including a plunger and a plunger sleeve. The plunger having a small predetermined diameter and being slidably positioned within a plunger sleeve having a diameter greater than the diameter of the plunger. The multipiece plunger is advantageous because it allows for shaping of the rate of fuel injected into the combustion process thereby reducing the excess fuel flow in the early portion of the injection cycle. Elimination of the excess fuel flow results in lower oxides of nitrogen and particulate exhaust emission levels and less engine noise.

Fuel injection rate shaping apparatus for a unit injector

Fuel injection rate shaping apparatus for a unit fuel injector

A pressure control system for controlling output pressure of a variable-displacement hydraulic pump used with a hydraulically-actuated electronically-controlled injector fuel system and method of operation is disclosed. The control system comprises a variable-displacement hydraulic pump with a control element adjustable to a range of positions which controls an output of the pump. The control system additionally includes positioning means for positioning the control element responsive to pressure differences between the fluid reference chamber and the output port. Electronic valve means regulates a pressure of hydraulic actuating fluid in the fluid reference chamber. The electronic valve means is electronically connected with the electronic control means to receive the output signal. A change in the output signal to the electrical valve means produces a change in the pressure of the hydraulic actuating fluid in the fluid reference chamber, thereby causing the positioning means to operably position the control element to change the output of the pump.

Variable-displacement actuating fluid pump for a HEUI fuel system

Herein are disclosed methods of conditioning fluid, such as damping fluid, in an electronically-controlled unit injector in order to facilitate quick starting of an engine. Fluid normally used to dampen the motion of an electrical actuator assembly of the unit injector can remain in the actuator assembly after the engine is stopped. If too much fluid remains and cools off in the actuator assembly, quick starting of a cold engine may be hindered. Each of the above methods expels and/or heats up at least a portion of the remaining fluid in the actuator assembly while the engine is at rest and thereby enables quicker response of the actuator assembly when the engine is started. Such quicker response improves the fuel injection delivery capability and timing accuracy of the unit injector during engine startup.

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East Peoria, IL, United States of America

Michael A Flinn