Southwest Research Institute

Cnh America LLC

Garrett L Anderson

Raphael Gukelberger

Matthew J Hennemann

C David Anderson

Richard J Lech

David Pratt Branyon

John Craig Hedrick

Ryan C Roecker

Jeremy D Eubanks

Thomas E Briggs, Jr

Timothy Joseph Callahan

Robert R Pool

A method of improving fuel delivery in an engine having one or more cylinders that are over-fueled related to other cylinders, such as a D-EGR engine. The fueling system uses a mechanical fuel pump, which is cam-driven. The cam has lobes corresponding to the desired displacement for each cylinder. The lobe corresponding to the over-fueled cylinder is shaped differently, such that the filling stroke of the pump is increased.

Internal combustion engine having dedicated EGR cylinder(s) and improved fuel pump system

An engine and a method of operating the engine wherein fuel, intake air, and recirculated exhaust gas provides a first mixture, which is inducted into a first combustion cylinder. The first mixture is combusted in the combustion cylinder to generate a first exhaust gas that applies pressure to a piston within the combustion cylinder, reciprocating the piston and rotating a primary crankshaft coupled to the piston. Fuel and intake air, which provides a second mixture, are inducted into a rotary combustion chamber. The second mixture is combusted in the rotary combustion chamber, wherein the combustion generates a recirculated exhaust gas that applies pressure to the rotor and rotates the rotor and a secondary crankshaft coupled to the rotor. The secondary crankshaft is coupled to the primary crankshaft by a gear mechanism. The recirculated exhaust gas is exhausted into an exhaust gas recirculation loop and recirculated.

Internal combustion, dedicated exhaust gas recirculation engine

A method of implementing start-stop in an internal combustion engine, the engine having exhaust gas recirculation (EGR) from at least one dedicated EGR (D-EGR) cylinder. For stopping the engine, the camshaft is locked, and a hydraulic cam phaser is used to cushion the engine inertia. The engine is stopped such that one of the D-EGR cylinders is in top-dead center position. For starting the engine, that D-EGR cylinder is fuel-injected, and exhaust bleed-off performed if necessary.

Internal combustion engine having dedicated EGR cylinder(s) and start-stop operation

A method, used with dual-fuel engine, of controlling the amount of gaseous fuel delivered to the engine. At operating conditions that result in an equivalence ratio below a predetermined threshold (which typically occur at mid or part loads), it is determined whether better performance and/or lower emissions can be achieved by reducing gaseous fuel to some cylinders and increasing gaseous fuel to others. Typically, the gaseous fuel is reduced to zero to a number of cylinders and increased to others, with the increase resulting in an equivalence ratio that will provide improved emissions and efficiency and the desired engine output.

Dual-fuel diesel engine with cylinder fueling control of gaseous fueling at less than full loads

Aspects and embodiments disclosed herein indicate a correlation exists between a specific gravity of combustible fuel and the occurrence of low-speed pre-ignition (LSPI) within engines. Thus techniques are disclosed herein for online measurement of the specific gravity of fuel within an engine, and allow for preventative measures to be executed to minimize or otherwise mitigate the incidence of LSPI when the calculated specific gravity of the fuel exceeds a predefined threshold. In an embodiment, the preventative measures may include, for example, altering or otherwise adjusting an engine map such that an injection timing scheme injects less poor-quality fuel into engine cylinders, thus advantageously preventing the engine from operating at full-power when conditions for LSPI are present.

Techniques for mitigating low-speed pre-ignition conditions in an engine and a fuel delivery system using the same

A system and method for sampling fluid from a top land piston crevice of a reciprocating piston engine. Access into the crevice is via a bore through the piston wall. A collector receives sampled fluid from the piston crevice, and has a housing, a valve, and a shuttle. The housing is an elongated hollow shell having a bore through its length, with the bore containing the valve and the shuttle. The valve opens to allow sampled fluid to pass along the bore toward the shuttle, when the valve is in an open position. The shuttle serves two purposes: it moves back and forth within the bore, thereby opening the valve, and also provides passages for storing sampled fluid within the housing.

Active fluid sampling from piston top land crevice of piston engine

A work machine includes a fluid circuit for use with an attachment configured to operate using one of a uni-directional flow and a bi-directional flow through the attachment. An operator-enabled mode selection switch operably connects to a controller. An electrical circuit includes the operator-enabled mode selection switch and a second operator-enabled switch. A first control valve is in fluid communication with the attachment. In response to the mode selection switch being operator-actuated to a bi-directional mode setting, the first control valve via the controller is actuatable to one of the bi-directional positions, electrical power being unavailable to the second operator-enabled switch of the electrical circuit. In response to the mode selection switch being operator-actuated to a uni-directional mode setting, the first control valve via the controller secures the first control valve in the uni-directional position, and electrical power is provided to the second operator-enabled switch of the electrical circuit.

Control system for work vehicle

An open center hydraulic system that includes a variable displacement pump having an inlet, an outlet and a sensing port, the pump configured to provide reduced fluid flow in response to a predetermined fluid pressure differential between the outlet and the sensing port. A first fluid circuit and a second fluid circuit each serve as signal lines with the pump sensing port. During operation of the second fluid circuit, reduced fluid flow from the pump outlet is achieved as a result of the sum of induced fluid pressure reductions of respective controlled pressure reduction devices approaching the predetermined pump fluid pressure differential.

Growing community of inventors

San Antonio, TX, United States of America

Garrett L Anderson