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Traction control with DBW


434josh
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E-throttle is generally too slow to be the primary torque reduction to control slip.  I believe there are some ECU's that use DBW as part of the TC strategy but it gets far more complicated - basically they will still use a traditional fuel/ignition cut as the primary torque reduction to get the slip under control quickly, then only reduce throttle if the cut has to be applied for a sustained period of time.  

I have played with it a little before (you can put slip on one axis of your E-throttle target table if you want to experiment) but found it to be pretty useless. 

To reduce torque by say 20% with an ignition cut you only need to cut 2 out of every 10 sparks.  To reduce torque by 20% using throttle only on a typical turbo car you need to close the throttle by something more like 50%.  What's worse is if you suddenly regain traction you then have to move that throttle all the way open again and wait for the turbo to come back to speed before you have full torque recovery.

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