About VVT Car Engine
VVT Engine
Engine Variable Valve Timing (VVT, Variable Valve Timing) in recent years have been increasingly used in modern passenger cars in one of the new technologies, the engine uses variable valve timing technology can improve the amount of intake charge, so that sufficient volume coefficient of increase in engine torque and power can be further improved.
For a four-stroke engine, according to many people's understanding of doing work stroke the end of the piston at the point just under the exhaust valve starts to open, the engine into the exhaust stroke until the piston reaches TDC, exhaust valve closed, intake valve open, the engine into the suction stroke. When the piston back next week, just run the only point, the intake valve closed, the engine into the compression stroke. Way to understand the valve action is correct? Almost is not it. However, there may, and with people's intuition is different is that such a valve timing efficiency is not optimal. Let us first consider the exhaust valve open time. If the ending point than the Pistons advance to the next 1:00 to open the exhaust valve what will happen? Intuitively, when exhaust gas can push the piston doing work, if you open the exhaust valve began venting, the pressure inside the cylinder at this time will be reduced, thus reducing the utilization of energy, engine performance will decrease. Is that true? In fact, not necessarily.
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