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• #39799 BlacKSouL addikt Kornel #39798

  Új Válasz 2016-05-24 19:24:40 #39799

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  BlacKSouL

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  válasz Kornel #39798 üzenetére

  Itt le van írva részletesen: [link]

  "...on a conventional engine, the throttle valve is normally partly closed to control or limit the intake volume of the fuel-air mixture. The air-flow restriction that is incurred due to intake resistance in such conditions is one of the biggest factor that leads to reduced engine efficiency, through pumping losses. With the R18A SOHC i-VTEC mechanism, Honda's R&D engineers introduced the idea of controlling the amount of air entering the combustion chamber via other means instead of the throttle butterfly. This is done via a combination of both valve timing and an exploitation of the property of the 4-stroke cycle and a new Drive By Wire (DBW) system....
  [...]
  So instead of using the throttle butterly to control or limit the amount of air entering the engine, we allow the air to enter the cylinders and then push the unwanted amount out of the cylinders. So the exact amount of air we want is now controlled by the timing of the intake valve closure. In this way, the throttle valve/butterfly is not used/needed and it is allowed to remain wide open even under low-load conditions. This contributes to a a major reduction in pumping losses - up to 16% reduction according to Honda's calcuations. Combined with comprehensive friction-reducing measures, this results in a significant increase in fuel efficiency for the engine itself."

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