torcs-users Mailing List for TORCS - The Open Racing Car Simulator

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|
| -has anyone made a version of Torcs that allows the use of a DC electric
| motor powered by a battery?
|

It should be easy to add an electric motor.  As a quick hack, I suggest
you measure the torque at various rpms, and furthermore, the time it
takes to rev up and down again, in order to estimate inertia and
friction.  Furthermore, you could set the fuel consumption to be very
low and have the vehicle run with a 1l fuel tank.

|
|
| -can a three wheeled trike (driven single rear wheel) be setup in
torcs that
| will give realistic handling?
|

Currently there must be 4 wheels.  However, your best bet is to set the
two rear wheels very close together and use a spool differential between
them.  That way, they'll be forced to rotate at the same speed.

|
| -Instead of fuel used, torcs would have to be modified to show electric
| current used.  The fuel tank level would be replaced by battery charge
| level.  Has anyone got any advice as to how to do this?
|

Set the fuel consumption factor and the tanks size very low.  Then, the
fuel will have negligible weight.


| -has anyone found realistic tyre data for bicycle tyres?
|
I have trouble finding any type of tyre data.

|
| -where can i find help on how to model the bicycle tyres?
|

The usual approach is to split them in many segments. One easy method
is to simulate one wheel as multiple wheels that are next to each other.
Also, although your car has no suspension, the wheel itself acts as a
suspension.  So the suggestion about placing the rear wheels close
together should work OK as a first approximation


|
|
| Regards,
|
|
|
| Tim
|
|
|
|
|
|
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Greetings

 

 

1.  I work for SWRC of TAFE ( a technical college) in Bunbury, Western
Australia.  We are building an electric vehicle for the EV challenge, held
here once a year (http://evchallenge.swantafe.wa.edu.au/ ).  

 

The object is to go as far as possible in 1 hour using 432 Wh of battery
power with 36V maximum voltage.  This means that they must drive as fast as
possible and yet obtain the maximum distance in 1 hour.

 

 

 

2.   The EV is powered by a 1 kW 3 phase brushless DC motor.  The motor
drives a single rear wheel by a chain drive.  There are two steered wheels
at the front using a normal go-kart like steering design.  The car has no
suspension as the average speed is 25-30 km/h.  The wheels are 20" bicycle
tyres.

 

 

3.   We are very interested in modelling the performance of the car,
particularly the energy used per lap around an 8 corner, 500m long track.
If our students can use torcs to drive the car around the track, they can
try different car setups and driving styles and see how these factors affect
energy use, lap time and handling.

 

 

4. I have done enough work to be able to model the energy use of the ev with
different configurations.  I have used a spreadsheet and some software
called EJS however, it lacks the marvellous driving interface that torcs
has.

 

 

5.    My questions are:

 

-has anyone made a version of Torcs that allows the use of a DC electric
motor powered by a battery?

 

-can a three wheeled trike (driven single rear wheel) be setup in torcs that
will give realistic handling?

 

-Instead of fuel used, torcs would have to be modified to show electric
current used.  The fuel tank level would be replaced by battery charge
level.  Has anyone got any advice as to how to do this?

 

-Could a robot be the best way to take data from torcs and display current,
amp hours used from battery etc?

 

-has anyone found realistic tyre data for bicycle tyres?

 

-where can i find help on how to model the bicycle tyres?

 

-has anyone successfully modelled a go-kart?

 

 

These are probably very unusual questions so any advice that you could give
would be appreciated.  If you are not able to help, could you please direct
me to someone who can?

 

Thanking you for your time.

 

Regards,

 

Tim 

 

the problem
===========
Compatibility mode, properties unknown.
WARNING: ssgLoadTexture: Cannot determine file type for './(null)'
GfParmCheckHandle: parameter "Front Wing/angle" out of bounds: min:0 max:0.20944
val:0.261799 in ("NASCAR RWD" - "drivers/lliaw/tracksdata/car_g-track-3.xml")
GfParmCheckHandle: parameter "Rear Right Suspension/packers" out of bounds:
min:0 max:0.01 val:0.02 in ("Tanhoj" -
"drivers/tanhoj/tracksdata/car_g-track-3.xml")
GfParmCheckHandle: parameter "Rear Left Suspension/packers" out of bounds: min:0
max:0.01 val:0.02 in ("Tanhoj" - "drivers/tanhoj/tracksdata/car_g-track-3.xml")
GfParmCheckHandle: parameter "Front Wing/angle" out of bounds: min:0 max:0.20944
val:0.523599 in ("Tanhoj" - "drivers/tita/tracksdata/car_g-track-3.xml")


the solution
============
change resolution of 640x480 for 800x600 or 320x240