[Diy_efi] Traction Control System (update 2)

[Shannen Durphey]

I only wonder why you aren't counting the frequency of the pulses rather than
measuring the voltage. 

Shannen

Crescent Kao wrote:
> 
> 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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