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Variable Gas Distribution

- Sep 03, 2018 -

Variable gas distribution technology, from a large class, including variable valve timing and variable valve stroke two categories. First of all, the common engine air distribution mechanism, we all know that the valve is driven by the crankshaft of the engine through the camshaft, valve timing depends on the angle of the camshaft. When the engine is running, we need to let more fresh air into the combustion chamber, so that the exhaust gas can be discharged as far as possible, the best solution is to let the inlet valve open early, so that the exhaust door delayed closure. In this way, between the intake stroke and the exhaust stroke, the air inlet and exhaust valve can be opened simultaneously, the overlap between the intake and exhaust door is called the valve superposition angle. In the ordinary engine, the opening and closing time of the intake and exhaust doors is fixed, the valve superposition angle is also fixed, is based on the test to obtain the best timing of the gas, in the engine operation process can not be changed. However, the engine speed of the high and low to the inlet, exhaust flow and the combustion process in the cylinder has an impact. When the speed is high, the intake air flow rate is high, the inertia energy is large, so I hope that the intake door open early, late closed, so that fresh gas into the cylinder smoothly, as much as possible mixed gas or air. Conversely, when the engine speed is low, the intake flow rate is lower, the flow inertia energy is also small, if the intake door opened prematurely, because the piston is upstream exhaust, it is easy to fresh air out of the cylinder, so that the air intake is less, the engine is not stable. Therefore, there is no fixed valve stacking angle setting allows the engine to be perfectly output at high and low speeds, without variable valve timing technology, the engine can only choose the most optimized fixed valve stacking angle According to the demand of its matching model. For example, a car's engine generally uses a smaller valve stacking angle to facilitate the power output at high speeds. Ordinary civilian vehicles use a moderate valve stacking angle, while taking into account the high-speed and low-speed power output, but at low speeds and high RPM will lose a lot of power. and variable valve timing technology, is through the technical means, to achieve the variable valve superposition angle to solve this contradiction

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