DIY Traction Control

[Bob - Uni]

Hello Crescent,

I have never done anything like that, but it sounds interesting, and
if I throw ideas in from a semi ignorant starting point, people who
actually have experience might be able to point out beginners faults.

I am thinking that the easiest way to cut power to the engine would
probably be to cut spark altogether? A system that progressivly cut a
higher and higher percentage of spark proportional to the speed
differential between the different wheels speed could do the job.

To measure the speed differential between the wheels, assuming that
the signal from the ABS sensors is something you you were guessing, 4
LM2917 ics could convert the incoming frequency to a voltage, and then
a 4 channel ADC that ran over an I2C bus would make for a simple way
to get the wheel speed information to a low power micro. In the micro
you could just use something like a lookup table to determine how much
spark to cut (or retard or whatever) for the current speed differential.

Just rough ideas, there is probably hidden pitfalls that someone else
might be able to see.

Thursday, January 24, 2002, 5:55:56 PM, you wrote:

CK> Hello,
CK>   I've been following your TC/ABS discussion over the past week or so. I've
CK> had this idea in my head for quite some time but never really got around to
CK> trying to implement it - a traction control system that utilizes the stock
CK> ABS sensors on the vehicle.
CK>   There's currently a company that already produces a bolt in kit that does
CK> the exact same thing, and will cut the fuel momentarily during excessive
CK> wheel spin. Upgraded kits offer user specified wheel spin.

CK> Here's the url:
CK> http://www.racelogic.co.uk/


CK> Anyways, I have an Industrial Design and Computer Science background and
CK> from what I can foresee, building and programming the software for such a
CK> system should be that diffcult especially if it simply tapped into the
CK> current on board ABS unit.

CK> The only thing holding me back from pursuing this project is that fact of
CK> reducing engine output during wheelspin via cutting fuel or retarding
CK> timing. I'm clueless as to how to approach this from a programming and
CK> hardware (laptop to ECM) interfacing standpoint.

CK> My idea right now for a prototype is to simply tap into the ABS sensor wires
CK> and feed the signal to the serial port on a laptop and write some code to
CK> determine wheelspin. Further than that, I'm not sure how to continue. I
CK> should mention that I'm also following the assumption that the current ABS
CK> system uses/sends a digital signal from the ABS sensors (a data stream of
CK> 0's and 1's corrosponding to the rotation of each wheel).

CK> Just throwing this idea out there. Anyone have any ideas?

CK> Crescent Kao
CK> Director of Marketing and Sales
CK> www.c-speedracing.com


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-- 
Best regards,
 Bob                            mailto:rcs07 at uow.edu.au

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