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<DIV>Basic functions off the top of my head:</DIV>
<DIV> 1. sensors monitoring the relationship between accelerator pedal and
phase, amplitude,etc. of current going into motor, while monitoring phase shift
of back emf that indicates how fast electric motor armature is going
around. </DIV>
<DIV>2. And algorithm that limits current to maximum current drawn
from batteries, and that monitors the voltage of batteries, (Ideally separate
readings for each cell of batteries ) . </DIV>
<DIV> </DIV>
<DIV>3. Then there is regeneration when accelerator pedal is let up some amount,
recharging batteries begins, how much current and how fast to charge to maintain
long life and not overheat ( temperatures of cells monitored too since battery
life is reduced when at high temperatures).</DIV>
<DIV> </DIV>
<DIV>4. And relationship between pressure on and position and rate of
change of accelerator and brake pedals. All related to actual speed of
vehicle to apply an algorithm to get maximum regeneration charge current but
with an override by brake pedal if brakes are needed hard down to prevent
a crash.</DIV>
<DIV> </DIV>
<DIV>5. A <STRONG>display system</STRONG> that shows charge voltage level of
battery pack, rpm of electric motor,vehicle speed in mph, forecast of miles to
go before needing charge. </DIV>
<DIV> </DIV>
<DIV>6.A circuit to calculate and warn about level of voltage in every cell of
battery so they do not ever get discharged too low and flip over and get
negative charge when charging. <STRONG>Displays to show all this data including
red flag warnings etc.</STRONG></DIV>
<DIV> </DIV>
<DIV>7. A circuit monitoring electric motor speed and temperature so
it does not overheat and run too fast, melting solder, destroying itself, and
<STRONG>displays showing all of the above</STRONG> when needed to warn driver to
not do something, etc. </DIV>
<DIV> </DIV>
<DIV>8. The charging circuit from 120 or 240 vac transformed to maximum voltage
needed for battery charge, rectified to DC, and then circuits monitoring and
then reducing ac input to not over charge batteries.<STRONG> And a display
to show that it is all working. </STRONG></DIV>
<DIV> </DIV>
<DIV>Probably more, but these are the same elements needed in Aircraft auto
pilots, except we only need input and control on one horizontal axis instead of
3 axis for airplaines.</DIV>
<DIV> </DIV>
<DIV>9. Probably a yaw or turn sensor to keep vehicle from turning too
fast with power on to roll over, based on the amount of unsprung weight on
wheels and axles, and the springing and shock absorber dynamics so it does not
yaw itself off of the road. </DIV>
<DIV> </DIV>
<DIV>I worked on the design of the B52 and Boeing 727 autopilots, but that was
in the 60's, so I probably don't remember a few details. </DIV>
<DIV>Good luck with the controller. </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT lang=0 face="Monotype Corsiva" size=5 FAMILY="SCRIPT"
PTSIZE="18"><I>Chuck Simms</FONT><FONT lang=0 face=Arial color=#000000 size=2
FAMILY="SANSSERIF" PTSIZE="10"></I><BR>
<DIV>
<DIV>In a message dated 6/14/2008 8:42:41 A.M. Central Daylight Time,
evehicle4me@hischopsticks.org writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>What are
the "basic functions" that a controller needs to manage?<BR><BR><BR>Quoting
Charlesvsi@aol.com:<BR><BR>> Good luck on DYI, We have a Honda Civic
Hybrid, I'm amazed at all the things<BR>> the computer does so
well.<BR>> I was in Process Control Computer Systems for 38
years, The control<BR>> software is very complicated, especially in
life or death <BR>> applications like cars.<BR>>
Hopefully you can find some inexpensive controller, with
sensors <BR>> etc, and menu<BR>> driven software, so it will
run all the basic functions, you will just have<BR>> to provide
specific information about your vehicle etc.<BR>> Have fun.
C.<BR>><BR>> Chuck
Simms<BR>></FONT></BLOCKQUOTE></DIV></FONT></DIV></FONT><BR><BR><BR><DIV><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Vote for your city's best dining and nightlife. <A title="http://citysbest.aol.com?ncid=aolacg00050000000102" href="http://citysbest.aol.com?ncid=aolacg00050000000102" target="_blank">City's Best 2008</A>.</FONT></DIV></BODY></HTML>