Four-stroke power valve system
http://dbpedia.org/resource/Four-stroke_power_valve_system an entity of type: WikicatMotorcycleEngines
EXUP（エグザップ、Exhaust Ultimate Power-valveの略）はヤマハ発動機が開発し、オートバイ用4サイクルエンジンに採用している排気デバイスの名称である。
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A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. At low engine speeds, the wave pressure within the pipe network is low. A full oscillation of the Helmholtz resonance occurs before the exhaust valve is closed, and to increase low-speed torque, large-amplitude exhaust pressure waves are artificially induced. This is done by partial closing of an internal butterfly valve within the exhaust where the primary pipes from the cylinders join. The alteration of the pressure at this point controls the behavior of reflected waves at this sudden increase in area discontinuity. Closing the valve increases the local pressure, inducing the formation of larger-amplitude negative
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El EXUP (EXhaust Ultimate Power valve) es un dispositivo incorporado en algunas motocicletas de Yamaha, concretamente en modelos de las series FZR, YZF y R, que ajusta constantemente el diámetro interno del sistema de escape en consonancia a las revoluciones del motor, consiguiéndose así un buen rendimiento y una entrega lineal de potencia en toda la gama de revoluciones.
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EXUP
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Four-stroke power valve system
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EXUP
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6344502
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1016783546
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right
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The exhaust power valve of a 2007 Honda CBR600RR.
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The servo motor controls the valve via two cables. Shown removed.
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vertical
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left
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center
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2007
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260
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El EXUP (EXhaust Ultimate Power valve) es un dispositivo incorporado en algunas motocicletas de Yamaha, concretamente en modelos de las series FZR, YZF y R, que ajusta constantemente el diámetro interno del sistema de escape en consonancia a las revoluciones del motor, consiguiéndose así un buen rendimiento y una entrega lineal de potencia en toda la gama de revoluciones. El sistema consiste en la instalación de una válvula en el interior del escape, en el punto donde se unen los cuatro colectores. Para obtener alto rendimiento de los motores de altas revoluciones, el sistema de distribución se diseña para que las válvulas de escape de los cilindros se anticipen en su apertura, lo que es beneficioso en ese régimen del motor, pero contraproducente a bajas revoluciones. Cerrando en ese caso la válvula del sistema EXUP, se crea una presión de retorno dentro del sistema de escape, que compensa el efecto anterior. Como consecuencia se logra una entrega más "lineal" de potencia, es decir un motor más elástico,y una gran entrega de potencia a altas revoluciones. Un servomotor controlado por el módulo de encendido abre o cierra el EXUP, que pasa de estar completamente cerrado al ralentí a una apertura total a 9000 revoluciones por minuto.
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A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. At low engine speeds, the wave pressure within the pipe network is low. A full oscillation of the Helmholtz resonance occurs before the exhaust valve is closed, and to increase low-speed torque, large-amplitude exhaust pressure waves are artificially induced. This is done by partial closing of an internal butterfly valve within the exhaust where the primary pipes from the cylinders join. The alteration of the pressure at this point controls the behavior of reflected waves at this sudden increase in area discontinuity. Closing the valve increases the local pressure, inducing the formation of larger-amplitude negative reflected expansion waves. A servo motor controlled by the ECU opens and shuts the valve. The valve goes from being almost fully closed at idle speed, through to fully open at higher engine speeds. This ensures low to mid-range performance, more linear power output and reduced exhaust noise levels while the valve is in its reduced opening position. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). It first appeared on the Yamaha FZR EXUP and was later used on many other Yamahas. Later versions from Honda went by the names Honda Titanium Exhaust Valve (HTEV) and Honda Variable Intake/Exhaust (H-VIX), appearing on the CBR600RR and Honda CBR929RR. Suzuki's version is called Suzuki Exhaust Tuning (SET). The system is also used on the Triumph Daytona 675 triple.
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EXUP（エグザップ、Exhaust Ultimate Power-valveの略）はヤマハ発動機が開発し、オートバイ用4サイクルエンジンに採用している排気デバイスの名称である。
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2935