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

Hi, everyone! I recently discovered TORCS after trying to look for
something for my final paper project in my college. I am interested in
making my own controller and am still in the learning phase.

For my final paper project, I decided to use Kalman Filtering for my
controller, based on this algorithm as shown by Rhudy et. al. in the paper
"A Kalman Filtering Tutorial For Undergraduate Students" (2017). The
algorithm I plan to use would be as shown as in section 3.2. which details
how the filtering is done each state. The eventual product will be used
with the SCR Server application and will be in C++ programming language.

In my project's paper, the purpose for the development of this controller
would be to see the performance of the controller in situations consisting
practice, qualifying, and racing against other AIs, driving the same set of
cars (in this case ) on five different tracks. I would envision that
algorithm would find a good racing line in each state, in addition to the
behavior where the controller would try to avoid an AI car when trying to
overtake.

Anyone has suggestions on the filtering part or a better algorithm to use
to achieve this? It's rare to see a final paper centered around TORCS and I
can't recall any of a final paper in my college that would be of a
reference, which is the reason why I consult to this place.

Thank you very much in advance, and hope you guys have a nice day!

~[R]

P.S.: Any forum recommendations on where I can talk about AI/controller
developments, especially regarding TORCS controllers? I would appreciate it!

Hi Christoph

I am not sure if the car was properly parameterized in test1. But to 
adopt it to the new tire temperature model I did quite some 
test-driving, here you can see a part of it, see:

https://youtu.be/Ou4Q2Ygzm8A

After the tires got warmed up it was a pretty pleasant ride, even with 
the horrible imprecise game pad.

Kind regards

Bernhard

On 05.01.2018 13:02, Christoph Gröver wrote:
 >
 > Hello List,
 >
 > I downloaded version 1.3.8-test1, compiled it and tested it.
 > The behaviour of the open wheel car car1-ow1 has changed a lot.
 >
 > Now it has horrible oversteer. It just flips sideways in full speed 
if I just
 > touch the steering wheel.
 > So the car is going sideways through almost every corner - which is 
not very
 > realistic for F1.
 >
 > I was able to find out that this is only due to the changes in the
 > car1-ow1.xml file.
 > If I copy the car1-ow1.xml from version 1.3.6, than everything is back to
 > normal - a stable car with decent downforce.
 >
 > I tested some of the parameters and found out the following changes 
make the
 > car so very instable:
 >
 > @@ -335,7 +335,7 @@
 >      </section>
 >
 >      <section name="Front Axle">
 > -       <attnum name="xpos" unit="m" val="1.6"/>
 > +       <attnum name="xpos" unit="m" val="1.231"/>
 >          <attnum name="inertia" unit="kg.m2" val="0.0056"/>
 >          <attnum name="roll center height" unit="m" val="0.012"/>
 >
 > @@ -346,7 +346,7 @@
 >      </section>
 >
 >      <section name="Rear Axle">
 > -       <attnum name="xpos" unit="m" val="-1.35"/>
 > +       <attnum name="xpos" unit="m" val="-1.719"/>
 >          <attnum name="inertia" unit="kg.m2" val="0.0080"/>
 >          <attnum name="roll center height" unit="m" val="0.04"/>
 >
 > I just changed these values to the old values and the car is working 
again.
 >
 > So, why the changes? Are they done on purpose?
 >
 > Greetings
 >

Hello List,

I downloaded version 1.3.8-test1, compiled it and tested it.
The behaviour of the open wheel car car1-ow1 has changed a lot.

Now it has horrible oversteer. It just flips sideways in full speed if I just
touch the steering wheel. 
So the car is going sideways through almost every corner - which is not very
realistic for F1.

I was able to find out that this is only due to the changes in the
car1-ow1.xml file.
If I copy the car1-ow1.xml from version 1.3.6, than everything is back to
normal - a stable car with decent downforce.

I tested some of the parameters and found out the following changes make the
car so very instable:

@@ -335,7 +335,7 @@
    </section>
    
    <section name="Front Axle">
-       <attnum name="xpos" unit="m" val="1.6"/>
+       <attnum name="xpos" unit="m" val="1.231"/>
        <attnum name="inertia" unit="kg.m2" val="0.0056"/>
        <attnum name="roll center height" unit="m" val="0.012"/>
        
@@ -346,7 +346,7 @@
    </section>
    
    <section name="Rear Axle">
-       <attnum name="xpos" unit="m" val="-1.35"/>
+       <attnum name="xpos" unit="m" val="-1.719"/>
        <attnum name="inertia" unit="kg.m2" val="0.0080"/>
        <attnum name="roll center height" unit="m" val="0.04"/>
 
I just changed these values to the old values and the car is working again.

So, why the changes? Are they done on purpose?

Greetings

-- 
Christoph Gröver, gr...@ma...

Hi,
I'm curious as to what is happening. (looks good)
Will there be an announcement?