DIY Traction Control

[Axel Rietschin]

----- Original Message -----
From: "Jorgen Karlsson" <jorgen.m.karlsson at home.se>
To: <diy_efi at diy-efi.org>
Sent: Friday, March 15, 2002 00:53
Subject: RE: DIY Traction Control

>15% wheel spin, Boost 1.1bar, EGT 1450

Sounds good on dry tarmac.

> Comments are welcome!

You may want to have a rpm based gain that follows the power curve and
scales the torque reduction (I mean 20% spin a 3000 rpm or at 8000 rpm
probably require a different answer) Along the same lines you may also want
to scale according to the gear ratio as you probably need to be more drastic
in 1st gear than in 6th. Also, if there is any bends on your way you may
need to reduce slip more during them, as tires will not generate cornering
force while they are already at the maximum forward traction (a steering
angle sensor or a lateral accelerometer might help). You may want to add an
additional gain under driver's control so he/she can reduce slip more in the
wet and augment it on gravel or snow, or according to personal preferences.
Last, you may want to keep the vehicle speed into account in the TC
activation threshold as some 'natural' slip occurs at high speed while the
car fights against the air more and more. Of course on a FWD car the very
first thing you need without even thinking about electronic TC is a limited
slip differential.

HTH, Axel


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