They don't know this, which is shameful.
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I was right, the Prius is not a full Atkinson cycle. It is: "But the Prius
1.5 Four is an Atkinson cycle four-stroke." Appear an Otto amened to an "Atkinson cycle four-stroke".Writeup of the Atkinson cycle used by the Prius.
Popular Science....
"It's an all-aluminum engine that produces just 70 hp. That may not sound impressive for a DOHC Four, but this powerplant was engineered for efficiency. The typical four-stroke engine works on the Otto cycle, with intake, compression, power and exhaust strokes of the same length. But the Prius 1.5 Four is an Atkinson cycle four-stroke. What's that?
It's an engine in which the power stroke is longer than the compression stroke, so it wrings every last bit of energy out of the downward push of the pistons. Of course, at the very end of the power stroke, there isn't much energy left in any four-stroke engine. So simply making the power stroke longer leaves something to be desired.
That weakness is overcome in the Prius by supplementing with electrical power when needed. (The only other production engine that's designed with the Atkinson cycle is the Mazda Millenia, which uses supercharging as its supplement. Mazda calls that engine a Miller Cycle.)
But how do the engineers make the strokes of different length? At the start of the 20th century it was tried with complex linkages that were hopelessly impractical. With the Prius's variable valve timing, however, it's all accomplished by computer control.
There is no change in the physical length of the strokes. What changes is their effective length. In practical terms, the engine is designed for the longest power stroke needed for efficiency, then the computer "shortens" the effective length of the compression stroke. On the Mazda Millenia, it's done by carefully timing the supercharger output. On the Prius, it's done by changing when and how long the intake valves are opened and closed, in accordance with engine rpm. At high rpm, the intake valve closing is delayed, so the compression stroke (when both valves are closed) effectively becomes shorter. At part throttle, the intake valve closing is advanced, so the effective compression stroke becomes slightly longer."
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The message from "IMM" contains these words:
Particulates is the word you were searching for but did not find.
dIMM yet again demonstrates both his totally closed mind and his complete failure to understand something as simple as a percentage. Not surprisingly he hasn't named the "other equiv cars".
Personally I wouldn't find anything as sluggish as a Prius (0-60 in 10.9 seconds) fun to drive (let alone great fun) and I don't suppose the handling is too great either but each to his own.
The message from "IMM" contains these words:
It looks as though Toyota has been taking lessons from dIMM in how to torture both mechanical concepts and the English language way past breaking point.
Perhaps someone should complain to the Advertising Standards Authority about the blatant abuse of the Atkinson cycle.
And you think that will be enough to keep Gorden's mits off it?
I wasn't suggesting a dealer could do it, but that an individual may - and some have - their oil analysed if they don't believe the makers 'extended' oil change intervals are ok. And of course the makers will do this, in conjunction with the oil makers, when determining oil change intervals - they don't just pluck a number from a hat.
However, built in oil analysers on individual engines are very much on the horizon. Cheap electronics allow many things once the prerogative of laboratories
You really do believe these wild claims, don't you? This would mean that a conventional transmission would have to be less than approximately 10% efficient...
Did you ever study physics in kindergarten? If so, you weren't paying attention...
Or any of the other want-ta-be's....
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Brain fart time. Make that around 50% efficient.
Although the way our resident clown bandies around efficiencies like a crazed ad man makes it rather difficult to comment with any accuracy.
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You really don't get it, do you?
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All of which adds to weight and cost. Any performance figures for this modification? The problem is the projected range is always the best possible scenario - which you'd know if you ever read anything other than adverts.
In this country and many others the cost of fuels is distorted by tax. And petrol tax produces a large income to the government. At the moment, electric cars are such a tiny number that you're allowed to use domestic electricity with no penalty. If they became common, the government would simply alter the taxing method to regain lost revenue.
This man clearly has no idea whatsoever. What do you expect from aman who wears yellow boots. Lithium Polymer batteries are light and store enough charge for car to travel 200-300 miles. EVworld:
"Is the battery-electric car dead? Not according to some experts, who claim that car manufacturers and legislators lost interest in the battery car just when battery technology started to take off. Among the most promising are a new-generation of lithium-ion or lithium polymer batteries that could offer vehicle ranges up to 300 miles or more. "
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*Any* lithium polymer battery? Do they only come in one size and don't take into account the actual usage of the vehicle?
Or have you yet again not understood *anything* ?
Of course not price. Doesn't matter to you - apart from buying s**te tools.
Yes, pet. You're believing the adverts again. Tomorrow's World would be proud of you. Wonder whatever happened to that.
IMM stopped writing the scripts !... :~)
In article , IMM writes
Most people would read the "some experts" and "most promising" and "up to 300 miles" as not being as cast iron as you do John, as people say you are an advertisers dream, this article is what's called an edivert
Mr Dot, I you anything about current developments in battery technology you will know it is all true. Even the unnatural fella is lauding it. BTW, EVworld is not a company, it a mag devoted to EVs, and say it as it is. having no vested interest in any technology. Large auto makers will not adopt a battery until they have tested it for a year.
Do I really have to spell it out for you like you are a child.
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