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Under the Hood: Tried-and-true design concepts drive Prius

5/14/2007 01:00 PM EDT
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Tech-nic
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re: Under the Hood: Tried-and-true design concepts drive Prius
Tech-nic   10/21/2010 3:12:05 AM
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You are so far of the mark in your comments (and spelling) that I do not know where and how to start to make you grasp the Prius concept. For the starter: Prius engine employs Atkinson Cycle, which combined with variable valve timing (VVT-i), is can technically be construed as an engine that changes its displacement based on the driver's request, speed, load, RPM, SOC...etc. Dual motor/generators are not the things Toyota engineers found on the shelf and bolted together. It took years of research, design, testing, and field test. I doubt you have ever seen a Prius transaxle assembly apart. If you had, you could not have dismissed it so offhandedly. That is true every car has ABS, PCM, SRS...etc. But do you realize how difficut it is to run ABS with a regenerative breaking capability? Which other car's (non-hybrid) PCM can combine ICE with two electic motor/generators, continuously mixing up the power of the two to maximize gas mileage and minimize emission, the two main design concept of the Prius? Do you realize how sophisticated and detail computer programm you got to have to manage this seemlessly and make the vehicle behave and run just like any other vehicle? Have you ever seen (I doubt it) the Power Split Device (PSD), acting as a CVT? It is by itself a marvel of mechanical engineering? List is too long to go over here...but the jury is out. There is practically nothing around that can get 50 MPG and still be considered AT-PEZV, just one step blow Zero Emission Vehicle? Please look around and see how the owners feel about their Prius...and study a little more. Simply join Priuschat.com...and read on. Thank you also for taking the time to read this. Best wishes.

tydogey
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re: Under the Hood: Tried-and-true design concepts drive Prius
tydogey   5/20/2008 6:14:45 AM
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My hat is off to your article. I would disagree the prius is "cutting edge", maybe cutting edge marketing by the manufacture. After reading the article and investigating myself, all of the subsystems talked about are present on even none "hybrid" vehicles of all manufactures. Nav systems, air bags, ECMs, ABS bla bla bla.. Found on all newer vehicles. The only thing I see different is Toyota added electric motors, invertor/convertor and a battery. Then in turn, presto! A marketing giant. It must have taken there engineers years to think of that. Toyota has done some thing. Traded a little gasoline for a very expensive battery that has a shelf life and hazardous to dispose of. A manufacture will have to do more to empress the educated, like a fuel cell vehicle that produces hydrogen on demand. Just my opinion... Thank you for taking the time to read.

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