Exhaust valve actuation system

An exhaust valve actuation system 200 for an engine (100, Fig 1) includes a reservoir 202, a first valve 204, a first cylinder 206, a second cylinder 214, an accumulator 222, and a second valve 224; during a cam lobe event of a cam 210, the first cylinder 206 is adapted to retract based on a movemen...

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Bibliographic Details
Main Authors Kevin James Schreader, Michael Howard McLean
Format Patent
LanguageEnglish
Published 23.10.2019
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
ENGINE PLANTS IN GENERAL
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Summary:An exhaust valve actuation system 200 for an engine (100, Fig 1) includes a reservoir 202, a first valve 204, a first cylinder 206, a second cylinder 214, an accumulator 222, and a second valve 224; during a cam lobe event of a cam 210, the first cylinder 206 is adapted to retract based on a movement of the cam 210 and provide a fluid pressure to each of the accumulator 222 and the second cylinder 214; the accumulator 222 is adapted to maintain the fluid pressure acting on the second cylinder 214 within a first threshold and vent excess fluid pressure beyond the first threshold to a tank 203; During a combustion stroke, the second cylinder 214 is adapted to extend and operate an exhaust valve 220 based, at least in part, on dropping of a combustion cylinder pressure below a second threshold. The invention is intended to overcome the disadvantages of turbo lag and drop in temperature of exhaust treatment apparatus during certain operating conditions of an engine.
Bibliography:Application Number: GB20180006232