Variable Cylinder Management (VCM) is Honda's term for its variable displacement technology, which saves fuel by using the i-VTEC system to disable one bank of cylinders during specific driving conditions—for example, highway driving. The 2008–12 Accords took this a step further, allowing the engine to go from 6 cylinders, down to 4, and further down to 3 as the computer sees fit.
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| - Variable Cylinder Management (es)
- Variable Cylinder Management (en)
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| - El Variable Cylinder Management o VCM es un sistema desarrollado por Honda para el uso de la tecnología del desplazamiento (Cilindrada) variable. Utiliza el sistema i-VTEC, capaz de desactivar una bancada de cilindros cuando se producen condiciones de conducción específicas (por ejemplo, la conducción en carretera) para ahorrar combustible. El Accord de 2008 lleva este sistema un paso más allá, permitiendo que el motor pueda pasar de 6 cilindros, hasta 4 e incluso a 3 cuando las condiciones se consideran oportunas. Para el VCM, Honda utiliza un árbol de levas, a diferencia del Sistema Multi-Displacement System de Daimler-Chrysler y el sistemas de varillas en el Active Fuel Management de General Motors. (es)
- Variable Cylinder Management (VCM) is Honda's term for its variable displacement technology, which saves fuel by using the i-VTEC system to disable one bank of cylinders during specific driving conditions—for example, highway driving. The 2008–12 Accords took this a step further, allowing the engine to go from 6 cylinders, down to 4, and further down to 3 as the computer sees fit. (en)
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| - El Variable Cylinder Management o VCM es un sistema desarrollado por Honda para el uso de la tecnología del desplazamiento (Cilindrada) variable. Utiliza el sistema i-VTEC, capaz de desactivar una bancada de cilindros cuando se producen condiciones de conducción específicas (por ejemplo, la conducción en carretera) para ahorrar combustible. El Accord de 2008 lleva este sistema un paso más allá, permitiendo que el motor pueda pasar de 6 cilindros, hasta 4 e incluso a 3 cuando las condiciones se consideran oportunas. Para el VCM, Honda utiliza un árbol de levas, a diferencia del Sistema Multi-Displacement System de Daimler-Chrysler y el sistemas de varillas en el Active Fuel Management de General Motors. Utiliza un solenoide para desbloquear la leva superior, por lo que esta flota libremente mientras que el muelle de válvula mantiene las válvulas cerradas. El accionamiento drive by wire del acelerador permite que el equipo gestione el flujo de combustible para suavizar la entrega de potencia del motor, haciendo el sistema casi imperceptible en algunos vehículos. Los vehículos con VCM están equipados con un indicador "ECO" en el tablero de instrumentos, que corresponde a la operación del sistema. También incluyen cancelación activa del ruido (ANC) y el sistema de Honda Active Control Engine Mount (ACM) o control activo del soporte motor. Los sistemas ANC y ACM trabajan en cooperación para cancelar tanto el ruido como las vibraciones que podrían producirse en relación con el proceso de desactivación de cilindros. El sistema ANC utiliza los altavoces de audio para cancelar el ruido mediante el uso de un sonido de fase opuesto. (es)
- Variable Cylinder Management (VCM) is Honda's term for its variable displacement technology, which saves fuel by using the i-VTEC system to disable one bank of cylinders during specific driving conditions—for example, highway driving. The 2008–12 Accords took this a step further, allowing the engine to go from 6 cylinders, down to 4, and further down to 3 as the computer sees fit. Unlike the pushrod systems used by DaimlerChrysler's Multi-Displacement System and General Motors' Active Fuel Management, Honda's VCM uses overhead cams. A solenoid unlocks the cam followers on one bank from their respective rockers, so the cam follower floats freely while the valve springs keep the valves closed. The system operates through controlling the flow of hydraulic engine oil pressure to locking mechanisms in the cam followers. The engine's drive by wire throttle allows the engine management computer to smooth out the engine's power delivery, making the system nearly imperceptible on some vehicles. When the VCM system disables cylinders, an "ECO" indicator lights on the dashboard, Active Noise Cancellation (ANC) pumps an opposite-phase sound through the audio speakers to reduce cabin noise, and Active Control Engine Mount (ACM) systems reduce vibration. The first version of VCM (2005-2006 Odyssey) hydraulic circuit control was defaulted open, meaning that the engine had to build up enough oil pressure on initial startup to begin operating the rear bank of cylinders. A single solenoid on the rear camshaft is activated to close oil pressure to unlock the cam followers, thereby closing the valves. In theory, the closing of all rear bank valves produces an ‘air spring’ effect. However, the reciprocating effect of the piston with closed valves reportedly produces a vacuum condition where oil can get pulled past the piston rings to flood the cylinder. When VCM disengages, the engine then misfires if needing to clear the cylinder of oil. This unique type of oil consumption has led to premature failure of parts like spark plugs, catalytic converters, engine mounts, pistons/rings, and cylinder walls. Newer versions of VCM have been developed to improve system reliability but consumers continue to log complaints. Owners of vehicles equipped with VCM frequently face vibration problems due to engine motor mount malfunction while ECO mode is enabled. Instead of replacing motor mounts, owners often override the VCM with a bypass mechanism, such as an in-line resistor based temperature override module. This has the effect of the vehicle computer believing that a sufficient engine temperature to enable VCM has not been reached. While this cannot guarantee that VCM will be disabled (e.g. differing climates/load scenarios), it can generally keep VCM from engaging under normal driving conditions. (en)
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