[Diy_efi] Traction Control System (update 2)

[Bruce]

A power supply to filter things well (to a voltage lower then the car would
run on), a LM339, a couple of count to ten IC's and then your *cutout*
logic.   During a count to 10 on a front wheel sensor if a rear does 12 or
more, then power cut.   Slippage will vary by application, driving style.
Or criss cross readings and responses.   Then a MPH cut out.
Bruce


----- Original Message -----
From: "Perry Harrington" <pedward at apsoft.com>
Subject: Re: [Diy_efi] Traction Control System (update 2)
> Doing the D -> A -> D is totally uneccessary.
> You are getting digital pules from the 339.  You need only count the
falling
> edge to falling edge time.  I'm sure the PIC could do this.
> --Perry

> On Sat, Apr 27, 2002 at 02:10:51PM -0700, Crescent Kao wrote:
> > First and foremost, I'd like to thank everyone for the amounts of input
you
> > have provided. You've all been a great help and wealth of information
thus
> > far.
> > Ok, before I dive into more of what you've all suggested, I counted the
ABS
> > teeth on the CV joints. Keep in mind again that the test vehicle is an
Acura
> > Integra using OEM axles. There are 50 teeth on the front and on the rear
> > joints.
> > Now.. reiterating your suggestions, the ciruit should now look like this
(if
> > i understand it correctly):
> > Using the LM339, it has 4 input comparators that will transform the ABS
> > signal (frequency from each wheel) to a usable square wave. I will then
need
> > 4 x LM2907 units to convert each channel from a frequency to a usable
> > voltage. (the LM2907 has a built in op-amp?) Then I will need an AtoD to
> > produce a DC signal from which I can then send via the RS232 using an
UART?
> > Do I have this correct? I poked around about PIC programming and found a
few
> > sites pertaining to programming PIC chips. I realize that you must
program
> > in ASM but I did find a site mentioning that you can program using C/C++
and
> > compile it for use on a PIC (which I would prefer). Anyone have
information
> > on this? Using the PIC route sounds promising, but I'd be lost again as
to
> > how to incorporate this PIC into the hardware.
> >
> > Thanks!
> >
> >
> > Crescent Kao
> > Director of Marketing and Sales
> > www.c-speedracing.com



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