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Unread 06-01-2009, 11:49
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ZakuAce ZakuAce is offline
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AKA: Garrett
FRC #2077 (Laser Robotics (Alumni))
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Join Date: Jan 2008
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Location: Delafield,Wisconsin
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Re: 4WD Turning Difficulties

Quote:
Originally Posted by spectre107 View Post
That sounds simillar to an idea I had about traction control. In cars its called ASR(Anti-Slip Reduction), the controller would have a set of known speeds that would equal to a set of rpms. For Example:

5fps=50rpm
10fps=100rpm
15fps=150rpm

Now while the robot is driving on the slick surface, the wheels start to slip and spin out(the rpms increase above the set known speeds)

5fps is not equal to 300rpms acorrding to the controller.

Therefore, the controller would reduce power to the motors so that the speed(fps) and revolutions of the wheel (rpm) meet the rules set by the knowns. This system in effect doesn't increase traction but keeps the wheels from spining out.
On this surface, I think you will spin out no matter what you do. If you don't spin out, you will still slide around.

Quote:
Originally Posted by Greg Peshek View Post
I can't conclusively say that the Ackermann steering requires significantly more traction to work, but from my experience it seems as if it does - and I would have a hard time seeing it working with a lack of traction on the front steering wheels. Take it as you may.

-Greg
Think you can put this year's wheels on your robot and give us a demo?

Last edited by ZakuAce : 06-01-2009 at 11:55.