Re: hev

["Joe Smalley" <joes@worldfront.com>]

You need two controllers.

1) A motor controller to adjust the power going from the batteries to the
motor to propel the car down the road. This one is controlled by the driver
to allow him to adjust the speed of the car to the ambient driving
conditions.

2) An engine controller to adjust the power being taken from the gasoline
and put into the batteries. This controller is outside the control of the
operator (except for starting and shutting off the car at the beginning and
end of the trip.) This controller's job is to keep the batteries full during
the drive.

Lee Hart explained the first controller well.

A second option for the second controller is to use an AC alternator (called
generators in the store) and convert the AC power to DC power in the battery
charge controller. This can be accomplished with a big battery charger (A
PFC-50 comes to mind) that runs off a 120 or 240 VAC generator (like Generac
or Honda).

The generator has a speed governor that keeps the engine at 3600 RPM to keep
the line frequency at 60 Hz. The battery charger is there to keep the
batteries happy.

When the throttle is depressed by the operator, the battery voltage drops
and the charger demands more power from the generator and the throttle on
the engine opens to keep the engine running at 3600 RPM.

When the operator cuts back on the throttle, the charger backs off the
current to keep the battery voltage from getting too high causing the engine
governor to back off the throttle to keep the engine at 3600 RPM.

This is a simple series hybrid using commonly available off the shelf
components.

Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
joes@worldfront.com

----- Original Message -----
From: "krishnaswamy nathan" <krishnaswamy_nathan@yahoo.co.in>
To: <ev@listproc.sjsu.edu>
Sent: Saturday, June 29, 2002 9:11 AM
Subject: hev


>
>
>
> We are doing a project on HYBRID ELECTRIC VEHICLE.We had planned to do
SERIES HYBRID.The generator we are using is separately excited of rating 4
Kw. the driving motor is D.C SERIES of rating 10 hp.
>
> since it is a series hybrid the motor gets its power from the generator
when the car is running at crusing speed. During acceleration the excess
power needed by the motor is given by the battery. the battery rating is
70AH C2 Discharge battery.The generator is coupled to IC engine.
>
> Our problem is how to control the motor?
>
> We thought of using CURTIS Controller for controlling the motor. The
controller during low speed or during stopping of the car splits the output
power from the generator and sends the required power to the motor and the
excess power is sent to charge the battery.During high speed the controller
gives the full power from the generator to the driving motor and it supplies
the excess power needed by the motor from the battery.
>
> We want to know whether one single controller can take care of this or do
we need two separate controllers?.
>
> whether their is series controller available in the market?
>
> please clarify our doubt.
>
> from
>
> krishna
>
>
> ---------------------------------
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