alt Hacker NewsI'm assuming that right now all valves as computer controlled so why we cannot have best of both worlds? cannot we dynamically switch between Otto and Atkinson cycles by just changing valve profiles?
computer could use Otto cycle in case more power is needed in rare situations
Replies
bluGill • yesterday at 12:40 PM
AFAIK all values are controlled by a camshaft. The computer doesn't get enough control. Solenoids seems like that are a possible replacement for CAMs, but they apparently have too many downsides.
➕ show 1 reply
> cannot we dynamically switch between Otto and Atkinson cycles by just changing valve profiles?
Toyota introduced this exact behaviour with their "Variable Valve Timing-intelligent Electric" (VVT-iE) system:
https://toyota-club.net/files/faq/16-01-01_faq_vvt_ie_eng.ht...
It uses an electric motor to control intake valve timing.