Wednesday, November 11, 2015
3 comments:
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Interesting. I was not aware of those models using this technology. Also, I had never delved into the principle. Thanks K2.
ReplyDeleteSo, do these hybrids use the double piston set up, or the variable-stroke single piston?
https://en.wikipedia.org/wiki/File:Atkinson_Engine_with_Intake.gif
I'm not sure. Somebody smarter than me can answer that, I'm sure.
ReplyDeleteI didn't see any "monkey motion" in various videos of the the ICE portion of the Prius. The pistons just go up and down smoothly, with the same stroke on each cycle.
ReplyDeleteThen I found the answer. Unlike the demo graphics above, there is no Monkey Motion. The Atkinson portion of the cycle is just implemented through the timing of valve opening. This next link explains it.
http://news.pickuptrucks.com/2015/01/how-it-works-2016-toyota-tacomas-atkinson-cycle.html
Here is the video. Essentially the physical stroke is lengthened, but the intake valve stays open through part of the compression cycle. That reduces the amount of mixture that is being compressed, but the effect is to lengthen the stroke during the power cycle, providing the Atkinson effect. I like this much better than the Monkey Motion approach.
https://youtu.be/uhtMEvfZkdM