[Diy_efi] Temperature/Pressure sensors

[Alex Garbino]

I've tried this before, but now I want to:
1) have a completely stand alone system, so I can use it in different cars,
as well as having the possibility of using it as a module to replace the
existing ECU
2) using the existing sensors just gives me a varying resistance.... I don't
have any of the calibration/linearization data, so it's difficult to
determine the actual values of what I'm measuring, as well as determining my
error margins...

Regards,
Alex


On 11/4/06, K DANIEL <kml_daniel at yahoo.com> wrote:
>
> Hello
> I think it's better to use the sensors of the engine instead of using
> external sensor all you need to locate the signals of the sensors is the
> wiring diagram of your engine
> Kamal Daniel
>
>
> ----- Original Message ----
> From: Alex Garbino <agarbino at gmail.com>
> To: diy_efi at diy-efi.org
> Sent: Saturday, November 4, 2006 8:41:07 AM
> Subject: [Diy_efi] Temperature/Pressure sensors
>
>
> Hello,
>
> I'm trying to build a data acquisition system to monitor various
> temperatures and pressures. I've been looking at thermocouples, RTDs, and
> thermistors; but they have widely different advatnages and disadvantages.
> I
> was thinking of using thermistors to monitor air intake temperature &
> pressure (on a turbocharged car, so I would like to monitor atmospheric,
> pre-intercooler, and post-intercooler/manifold) as well as coolant temp,
> oil
> pressure & temp, and EGTs, both before and after the turbocharger.
> Thermistors seem the best choice for air intake, since they have a fast
> response and are cheap; however, I cannot find good datasheets regarding
> the
> linearization coefficients.
>
> Does anyone have advice on a good way to capture data, as well as any tips
> on the best way to mount these sensors (a modular system would be best, so
> I
> could move sensors to different positions and switch them in and out with
> minimum hassle)? Also, can anyone recommend a good source of cheap
> sensors?
>
> The signals will be captured via a PIC18F series' A/D converters/digital
> inputs, and relayed immediately onto an on-board computer. Please let me
> know of any resources that would be helpful!
>
> Regards,
> Alex
>
> For a more detailed discussion on what I'm trying to achieve, please see
> http://www.mkiiitech.com/forums/viewtopic.php?t=903
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