limcheehin30 发表于 26-7-2014 10:45 AM 
真的是看到我眼花花了
开始时i-vtec 推出时(k20,k24)是声明i-vtec 科技= vtec+vtc 的。。那时的i-vtec 就只有DOHC ......
后来他们推出SOHC smart ecu i-vtec 没有了VTC 但还是用回i-vtec 这名子。。。
http://asia.vtec.net/article/ivtec/
intelligent-VTEC - The Next Generation The last evolution of Honda's VTEC system was back in 1995 where they introduced the now-famous 3-stage VTEC system. The 3-stage VTEC was then designed for an optimum balance of super fuel economy and high power with driveability. For the next 5 years, Honda still used the regular DOHC VTEC system for their top power models, from the B16B right up to the F20C in the S2000. Now Honda have announced the next evolution of their legendary VTEC system, the i-VTEC. The i stands for intelligent : i-VTEC is intelligent-VTEC. Honda introduced many new innovations in i-VTEC, but the most significant one is the addition of a variable valve opening overlap mechanism to the VTEC system. Named VTC for Variable Timing Control, the current (initial) implementation is on the intake camshaft and allows the valve opening overlap between the intake and exhaust valves to be continously varied during engine operation. This allows for a further refinement to the power delivery characteristics of VTEC, permitting fine-tuning of the mid-band power delivery of the engine. Variable Timing Control Operating PrincipleHonda's VTC operating principle is basically that of the generic variable valve timing implementation (this generic implementation is also used by by Toyota in their VVT-i and BMW in their VANOS/double-VANOS system). The generic variable valve timing implementation makes use of a mechanism attached between the cam sprocket and the camshaft. This mechanism has a helical gear link to the sprocket and can be moved relative the sprocket via hydraulic means. When moved, the helical gearing effectively rotates the gear in relation to the sprocket and thus the camshaft as well.
本帖最后由 jscyl1980 于 26-7-2014 11:15 AM 编辑
| 
发表于 26-7-2014 02:10 AM
.gif)
只是最近出的车
3223 
71
