DIY Traction Control

[Steve Leonard]

Along those same lines...I am constructing a traction contol with a "wheelie 
control" option for my Turbo EFI Kawasaki motorcycle.  I have a "Tiny Tiger" 
board, Hall effect sensors on the rear and front wheels. A displacement 
sensor for the front forks and a +-2g accellerometer (at 45 degree 
mounting). Control of the engine will be done using the fuel injectors. (at 
least in theory)
  I am using a PalmPilot interface with a Visual Basic module for the 
programming. I hope to testing it in 3-4 weeks...





>Date: Fri, 1 Mar 2002 21:29:24 +0100
>From: BRIAN at lightprocessor.co.uk (Brian Sidebotham)
>Subject: DIY Traction Control
>
>Hi there all,
>
>  I'm new so be gentle! I expect you've been asked it all before, but
>here goes anyway...
>
>  I'm currently developing a traction control system for 2WD cars. I
>have gone on the basis that I need to know the rotational speed of
>each wheel, detect the rotational differences between the driven,
>and non-driven wheels, and vary engine output accordingly.. (Put
>simply anyway! ;) )
>
>For the rotational speed, I've chosen to use ABS sensors. My car
>was never available with ABS, but it is possible to fit ABS from
>different cars to my car.
>
>For modifying the engine speed, I was originally going to use a fly-
>by-wire accelerator system, but for two reasons I have chosen to
>go a different route:
>
>(a) complexity of design in the fly-by-wire system
>(b) engine response is a bit slow, and may not be able to work
>effectively as a launch control system aswell.
>
>So I have decided to modify the injector pulses. Effectively not
>injecting fuel for a predetermined  number of fires in a time window.
>I have worked a time window, which will mean I have a resolution of
>2% of the engine power. I feel this is more than adequate for my
>application.
>
>It's not really a road-going car, although it is fully road legal, and
>will be used on the road quite a bit. I'm not concerned about the
>engine popping away, and a slightly rougher ride, rather than the
>smoothenss of traction control that I would recieve through the fly-
>by-wire system.
>
>So my questions are, am I heading in the right direction? I reckon
>an AVR will suit it, I have all the dev kit at work for the AVR's so
>theres no problem there. Are there any thoughts between the two
>systems, fly-by-wire, and injector suppression?
>advantages/disadvantages?
>
>Should I be monitoring anything else? or anything I should be
>taking into account.
>
>The algorythms for Traction Control, and Launch control will be
>different won't they? At the moment, the changes in the program for
>traction, or launch control seem very subtle, and not too well
>defined in my head, so any pointers on the alogorythms used
>would be really useful.
>
>Sorry for the long post. For further information on my thinking, etc.
>See the Traction Control Project section of http://www.valvers.com
>
>BTW, it's for an injection car, motronic 2.5 based ECU system,
>4cyl, Driven wheels have an Auto Torque Biasing LSD in the box,
>so theres no fear of single-wheel spinning holding things up. Can't
>think of anything else that's of use...
>
>Thanks in Advance,
>Brian Sidebotham.
>


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