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An engine moves a vehicle with the power from explosions in the combustion chambers, burning a mixture of oxygen from the air and gases from fuel. When gasoline or diesel oil burns, it’s actually the gaseous form of the fuel that burns, and not the liquid form. The ‘doors’ that allows all these gases to move in and out of the chambers before and after combustion are called valves. If we were to compare an engine to a heart, these doors are heart valves.
The revolutions per minute of an engine varies as a vehicle accelerates or is driven along a highway. Perfect timing for opening and closing these valves depends on the number of engine revolutions per minute.
By controlling the valve movements to constantly achieve perfect timing, the gaseous mixture of air and fuel can be exploded at the ideal moment, and greater power can be created with less fuel. This reduces harmful substances contained in the exhaust gas.
VCT controls the timing of valve movements with a computer.
In 1997, DENSO developed a new VCT, which is smaller in size than previous types and can control the timing of opening and closing valves at the double the old speed. This new VCT has been accepted as an eco-friendly engine part and is equipped on many automobile manufacturers’ models, not only in Japan, but also in Europe and the U.S.A. |
| *VCT:Variable Cam Timing |
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