[Diy_efi] Traction Control System (update 2)

[Lachlan Chapman]

I dont think the voltage will be increasing, if i were you i would probe it
with an osciiliscope to see the frequency of the pulses
----- Original Message -----
From: "Crescent Kao" <crescent at c-speedracing.com>
To: <Diy_efi at diy-efi.org>
Cc: <noltez at c-speedracing.com>; <sailwhatcom at hotmail.com>
Sent: Friday, April 26, 2002 12:16 PM
Subject: [Diy_efi] Traction Control System (update 2)


> Ok.. we've made a little more progress on the traction control system.
> Here's a recap of what we have so far:
>
> . Test vehicle - Acura Integra with ABS
> . Signals generated from the ABS sensors - 0.7mV AC (and up, depending on
> speed)
> . Probing the ABS wires at the ABS brain verified the signals. The AC
> voltage increases as speed increases. (around 1.4mV at 35mph
>
> So... at this point we were looking into how to convert the signal to a
> digital signal and read it via a serial connection (RS232) to an onboard
> laptop.
>
> This is what we have so far hardware wise:
>
> . using an op-amp, bump up the 0.7mV+ input signal (above 1v?)
> . then convert the AC signal to DC
> . convert the analog signal using an AtoD processor
> (perhaps NSC ADC08034 http://www.national.com/pf/AD/ADC08034.html 4
> inputs -
>   however it specifies that it interfaces using "Microwire". I have no
idea
> what this is. Should we use an   AtoD that uses parallel interface
> instead?)
> . format the signal to a usual datastream
> . send the data via UART (9600 or 11500 baud) to the RS232 port
>
> This is our current challenge. Does this approach sound correct?
>
> Crescent Kao
> Director of Marketing and Sales
> www.c-speedracing.com
>
>
>
>
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>
>



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