[Diy_efi] Traction control strategy (solution offered)

Axel Rietschin axel_rietschin at compuserve.com
Tue Apr 30 07:31:17 GMT 2002


----- Original Message -----
From: "Crescent Kao" <crescent at c-speedracing.com>

> As someone also mentioned in a previous post as well, using the serial
port
> (RS232) may be easier (vs the parallel port). Is this true? If so, what
> would be required to take this route?

Much easier from the PC side if the external hardware can send you 'high
level' wheel speed values but of course said external hardware has to be
more complex to do that (i.e. probably use a microcontroller).

OTOH hooking the LM339 directly to the // port is definitely the much direct
approach but then you might encounter difficulties to do precise timing of
the raw pulses on a PC, things such as interrupt latency might come into
your way, if your OS let you directly access the // port at all.

As a side note, 2% slip is no slip at all. I'd (well, I actually do) aim for
15% on dry asphalt and 5% in the wet. This is a percentage of the vehicle
speed so just substracting raw pulses counts simply won't cut it.

--Axel







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