[Diy_efi] Traction Control System (update 2)

[Garrett Herning]

Hi, see below....


From: "Crescent Kao" <crescent at c-speedracing.com>
>Reply-To: Diy_efi at diy-efi.org
>To: <Diy_efi at diy-efi.org>
>Subject: RE: [Diy_efi] Traction Control System (update 2)
>Date: Sat, 27 Apr 2002 14:10:51 -0700
>
>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

Some pics have AtoD converters built right inside on one of the input ports, 
up to 8 on some. The assembly isn't too bad to work with but can get long. 
Pays to get a good book on pics if you are going to use them, I have 
rogramming and DCustomizing PICmicro Microcontrollers by Myke Predko. Its 
not a bad book, comes with a pc board to build a simple programmer, some of 
the code in the book for different things is wrong, but he has uopdates on 
his website... I would think the PIC chips should be able to do what you 
need, I know MSD uses them on their stuff (at least that's what they told me 
when I applied for a job with them)

GRH


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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