DIY Traction Control

[md4etal]

You forgot to mention that you would use spark timing as well.  This is
really important for forced induction engines.

Mike D.
----- Original Message -----
From: "Brian Sidebotham" <BRIAN at lightprocessor.co.uk>
To: <diy_efi at diy-efi.org>
Sent: Friday, March 01, 2002 2:29 PM
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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