[ausev] EV Calculator Script

[Nick Viera]

Hi Tom and all,

tomsmail wrote:
> Just a note: the rolling resistance quoted by tire
> manufacturers is not the same thing as rolling resistance of
> the vehilce; it doesn't include bearing pre-load torque and
> other shaft resistances.  These others contribute to lost
> energy. 

Correct. EV-RATS asks for a coefficient of rolling resistance for a 
single tire. It will multiply this by the number of tires and use it to 
calculate the total force required to overcome this tire rolling resistance.

However, it also asks for a coefficient of resistance of the drivetrain, 
which is uses just like the tire RR coefficient to ultimately calculate 
the force required to overcome losses in the drivetrain, which would 
include all bearings, gears, etc. While this is probably not the most 
accurate way to calculate the amount of drag these sources introduce 
into the system, it gives the user a way to account for them nonetheless.

Thanks,

-- 
-Nick
1988 Jeep Cherokee 4x4 EV
http://Go.DriveEV.com/
http://www.ACEAA.org/
--------------------------