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The advantages of electric vehicles (EVs) are well-known: nonpolluting operation, a renewable power source, safety, and low cost of operation. The disadvantages include limitations on speed, operating range, and convenience as well as the high cost of converting existing vehicles to electric operation; while acknowledging such other disadvantages as lack of effective heating, air conditioning, and power steering, EV advocate Brant says some of the best-known ones are myths. Speed, for instance, is related to body weight, and less weight means more speed. (Weight is, however, also a factor in safety: lighter weight often means less safety, especially in collisions, and Brant doesn't mention the collision factor.) Brant provides comprehensive instruction in converting a vehicle to electric power.
So we will make my own and control it with a micro processer. A PIC or ARV or AREM are what we think. but Which will be fast enough? we Want a fast acceleration so must have a fast micro pro cesser. Will a AREM acceleraet quickly or will a PIC be better?
We are serious and will be working withj hard work to progress this amazing project.
Good help will be treated well.
"A PIC or ARV or AREM ..."
Those are way overkill. A 4-bitter will do it.
www.epson.jp/.../
Why such a limited choice of processors? What about ColdFire? Just think about it for a minute: your engine will run cool, yet it will have that special spark.
nonpolluting operation,
electric vecicles do not eliminate pollution, they move it to the power plant.
Erik
".... yadda yadda yadda ..."
Your motor control is at issue? and you need a 'fast processor' to control it?
IF that is your question then you must include the type of motor control you plan on using.
Most likely it will be PWM generated. Keil supported processors will have flavors with the PWM (PCA) built in.
Even the 8051 has the 'horse-power' to control a 3-phase PWM... and "accelerate" fast.
Generally speaking, if you are going to do any heavy motor control or loop-control mathematics, then you might consider a DSP like Texas Instrument's TMS2000 series.
But usually an ARM processor can handle a wide range of applications and it is becoming The Standard 16/32 bit controller.
I'd recommend either an 8051 with a PCA, or an ARM (with PWM/PCA). Keil's Demo tools should be capable of some simple motor control (if thats your issue).
It is just that your question is too vague to answer properly. So please spend some more time defining your system requirements before asking which processor to use.
--Cpt. Vince Foster 2nd Cannon Place Fort Marcy Park, VA
-------------------------------------------- ..... please give me a new Inifinity No Lexus or Corvettes will ever do for me I'll low-life and drive fast oh so recklessly ..... please give me a new Inifinity --------------------------------------------
"nonpolluting operation"
Maybe non-polluting at the point of use - but no less polluting overall than an IC engine.
"renewable power source"
Only if your electricity is generated from a renewable source - which is generally not the case.
"safety"
Electric cars are no safer than IC engined cars.
That depends on the availability of electricity, and also how the batteries are produced. I don't think I have seen any article about life-time analysis of the batteries. How much energy and chemicals to manufacture them, and now much waste when they are consumed.
Remember that some regions of the world have access to quite clean electricity while having too long distances to other parts of the world to be able to easilly transport the excess energy and sell on the spot market. So consuming wind power in the car may consume electricity that could not have been sold somewhere in Poland and replaced oil or coal.
The best non-IC vehicle is this one: upload.wikimedia.org/.../EddyMerckxHourRecordBike.jpg
Does that settle the EV-IC arguement? 'cuz round-n-round we go. (I agree, we should have little nuke plants in our EVs).
This 'guy' has a project he wants to do. Who cares if it makes sense. Lots of people want to do an EV even if it requires a gas powered generator to charge it up.
Well the question to ask: Does someone who needs to ask have the required skills?
Even for a tiny 20 bph, the energy to control is quite high. Either very, very high currents. Or quite high voltages. Breaking a 100A circuit with inductive load can zap a lot.
Your linked bike would have been an excellent choice for an initial project. Not too large and heavy, and a 100-500W motor would be very useful.
But the OP did talk about not having too light vehicle in an accident which does suggest a car. And having 20 car batteries with a combined weight of about 300kg and giving around 60A at over 200V for an hour, the power electronics are not trivial.
Going for LiIon batteries are nice, but so very expensive. And while reducing the weight, it would add a huge problem with the charging - Li-Ion burns/explodes so nicely if incorrectly treated.
Your 'analyis' reminded me of being part of a team that built a Battlebot. We had 3 9-hp brushless DC motors in it running 130V at 800 Amps using LiIon batteries.
Charging was a "big ordeal" yet the only 'explosion' that occured was when an engineer cut the power lines at the same time. The wire-cutters detonated and it rained multen metal all over our machine. My face was a scant 2 feet from the detonation. I was unscathed, but Mr. Current Tester burned his hand fairly badly.
Ahh, those fond memories.
(My role was the DSP controller electronics and the firmware for controlling the motors from the R/C interface)
Mr. Current Tester was a veteran "HIGH-POWER" specialist who made a dumb mistake. It happens to the best of them.
A photo of our battery pack (it was double-layered too): http://i.imgur.com/5WS3q.jpg
While I generally agree with all the previous posts, I still feel it's a worth while DIY project.
I suggest that the OP look into IGBT control circuits. IGBT devices, while a bit pricey, quickly move the high power control down to embedded logic levels.
Many IGBT devices have default current level controls. Some Tranzorbs, a few high power by-pass diodes and the "kick" Per mentions can be recovered to help re-charge the batteries.
To the OP.. always have your drive circuits default to the OFF levels. ANY loss of control should default to OFF everything!
Gasoline with it's wide explosion points is still one of the more dangerous items in the general public's hands. Bradford
Hmm, interesting. I took this to be a troll right off the bat, yet the rest are taking it seriously.
Shame on me. I'll up (or reduce) my bid to one mechanical switch and a hole in the floor for Flintstone (TM) feet assist.
Lithium batteries can turn pretty nasty...
Gasoline with it's wide explosion points is still one of the more dangerous items in the general public's hands.
Yeah, but people have been around it for long enough that general awareness of the safety implications in handling it is common knowledge. It even comes with a strong, easily recognized smell to warn people what they're dealing with.
High-energy electrical batteriess, like those needed to power a electrical or hybrid car, OTOH, are new to most people, and they don't deliver any warning people are likely to recognize in time to react. No smell, no sound. There's light and heat, but only when it's already too late. It'll take a whole new round of public education to make sure accidents stay at a tolerable level.
Generally speaking there can be no such thing as a completely safe replacement for gasoline. Whatever you use, its purpose is to contain a lot of energy in as little weight and volume as possible. It's quite inevitable that in case of an accident that energy will be liberated in an uncontrolled, dangerous manner.