The invention discloses a
cam oil-supply type electro-hydraulic valve driving
system and belongs to a variable-valve
cam oil-supply type electro-hydraulic valve driving
system of an engine. The
cam oil-supply type electro-hydraulic valve driving
system mainly comprises an oil supplier, a valve driving mechanism, an
oil tank, a connection oil line and an
electromagnetic valve. An opposed cam-
plunger oil supplier is designed according to the number of cylinders of the engine and the ignition order, and hydraulic
oil can be provided for all intake /
exhaust valve driving mechanisms of the engine by using only two oil suppliers. A variable intake /
exhaust valve can be realized and energy required by valve drive can be reduced by controlling a first
electromagnetic valve between an
oil supply oil cavity and a driving oil cavity. The secondary opening of the
exhaust valve is realized by controlling a fifth
electromagnetic valve.
Energy consumption for charging the
oil supply oil cavity can be reduced by matching a second electromagnetic valve between the
oil supply cavity and the
oil tank with a fourth electromagnetic valve between a forward oil supply oil cavity and a reverse oil supply oil cavity. When a third electromagnetic valve is used, a
valve seat buffer and a valve gap
regulator are saved, the valve closing speed is increased and the valve closing range is broadened.