โดย: ton_mct
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The first experimentation with variable valve timing and lift was performed by General Motors . GM was actually interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.
เรื่อง Alfa นะครับ
The first functional variable valve timing system, including variable lift, was developed at Fiat . Developed by Giovanni Torazza in the 1970's, the system used hydraulic pressure to vary the fulcrum of the cam followers. The hydraulic pressure changed according to engine speed and intake pressure. The typical opening variation was 37%.
(Alfa ก็เป็นส่วนหนึ่งของ Fiat ครับ ตั้งแต่ช่วง 1970s)
์Nissan ครับ
Nissan VVL - Varies intake, duration, and lift by using two different sets of cam lobes
อยู่ในเครื่อง SR20 VE, SR16 VE ครับ
ของ Mitsu นะครับ
MIVEC (Mitsubishi Innovative Valve-timing-and-lift Electronic Control) variable valve timing technology developed by Mitsubishi. MIVEC varies the lift of valves by using two different camshaft profiles
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