Caterpillar Inc.

Siddharth Nair

Manjunath Bannur Nagaraja

Ramshankar Muthukumar

Ponraj Balasundaram

A fuel system includes a plurality of fuel injectors connected to a common drain conduit, and a plurality of isolation valve assemblies each positioned fluidly between the common drain conduit and one of the plurality of fuel injectors. Each isolation valve assembly includes a valve member movable between a closed position to block an injection control valve assembly in the fuel injector from the common drain conduit, and an open position, and a biaser biasing the isolation valve member toward the closed position such that fuel injectors are isolated from fluid pressure pulses produced by nozzle check actuation to limit cross-talk among the fuel injectors.

Fuel system having isolation valves between fuel injectors and common drain conduit

A fuel system includes a plurality of fuel injectors each having an injection control valve assembly, a direct operated nozzle check, a high pressure nozzle supply passage, and a check control chamber. A common drain conduit fluidly connects to each of the plurality of fuel injectors to receive drained actuating fluid. A plurality of pressure regulating valves each having a static geometry are positioned fluidly between the common drain conduit and the check control chamber in one of the plurality of fuel injectors. Operating a fuel system according to the present disclosure includes limiting cross-talk between injectors in the fuel system.

Fuel system having fixed geometry flow regulating valve for limiting injector cross talk

A filter for a fuel injection system includes a body that defines a longitudinal axis, a first end face, a second end, an outer surface extending between the first end face and the second end, an inner surface defining an inner chamber closed at the first end face and open at the second end. The body also defines at least one perforated portion formed in the outer surface extending from the outer surface to the inner surface, at least one slot extending axially along the outer surface. The slot is open and is in fluid communication with the first end face and defines an edge along the outer surface. The edge provides fluid communication between the slot and the perforated portion. Additionally, the edge and an inlet channel of the fuel injection system are adapted to define a first filtration zone. The perforated portion defines a second filtration zone.

Filter for fuel injection systems

A filter adapter for a fuel injector is disclosed. The filter adapter may have a filter housing. The filter housing may have a first connection end and a second connection end. The filter housing may also have a through bore extending through the filter housing between the first connection end and the second connection end and forming a filter cavity. The filter adapter may also have a first filter positioned in the filter cavity and including a first plurality of openings and a second filter positioned in the filter cavity and including a second plurality of openings. The first connection end may have a first connector configured to mate with a fuel outlet of a first fuel system component. The second connection end may have a second connector configured to mate with a fuel inlet of a second fuel system component.

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Dunlap, IL, United States of America

Siddharth Nair