Valve assembly having multiple rate shaping capabilities and...

Details Valve assembly having multiple rate shaping capabilities and... Valve assembly having multiple rate shaping capabilities and...

2005-08-30

2005-08-30

Hwu, Davis (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S533200, C239S533300, C239S533800, C239S585100, C239S585500

Reexamination Certificate

active

06935580

ABSTRACT:
Engineers have determined that the performance of fuel injectors, including those used in common rail fuel injection systems, can be increased, and undesirable emissions reduced, by controlling the mass flow rate of fuel injected into a combustion chamber during an injection event. While a number of fuel injectors have been developed that have limited rate shaping capabilities, the ability to produce some front end rate shapes has not been possible. In an effort to increase rate shaping capabilities, the present invention includes a valve assembly having at least one valve member that is movable between a plurality of positions to control fluid communication between a number of fluid inlets and outlets.

REFERENCES:
patent: 4971290 (1990-11-01), Dahlmann
patent: 5345916 (1994-09-01), Amann et al.
patent: 5890471 (1999-04-01), Nishimura
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Heavy Duty Diesel Engines—The Potential of Injection Rate Shaping for Optimizing Emissions and Fuel Consumption, presented by Messrs. Bernd Mahr, Manfred Dürnholz, Wilhelm Polach, and Hermann Grieshaber, Robert Bosch GmbH, Stuttgart, Germany, at the 21st International Engine Symposium, May 4-5, 2000, Vienna, Austria.

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