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发表于 3-4-2012 00:27:17
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okay, forgive me about my Chinese 'coz I really don't know how to explain it to you using my poor Chinese.
basically, all kinds of VVT technologies are based on the simple idea of changing the relative position of the timing gear and the camshaft and most of them are categorized into the so called two-stage or two-phase adjustment (like the VTEC from Honda and the VANOS from BMW). this means the system will only take in when the rpm reaches a certain level and the adjustment shifts very rapidly. there are, however, continuously changing VVT systems on the market like the Toyota's valvematic technology.
so, back to the topic, when the rpm goes high, the VVT system will increase the angle between the timing gear and the camshaft thus to let intake valve open earlier, creating bigger valve overlap. when the rpm drops down, the system will also intervene. |
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