TPS failures - better designs?

[EK]

There are hall TPS sensors around, but dont remember who makes them. They
use a linear hall sensor device. Check out the devices at
http://www.melexis.com/site/products/prod_w/f_prod_w.htm, specifically the
MLX90215 if you want to roll your own. Its sensitive enough to give a good
output, but is a sampling device, so is kinda slow responding (1-2 Khz I
think). Optek http://www.optekinc.com/hallogic%20hall%20R.htm show some of
their device data sheets, specifically the OHS3151, which is much faster,
but not near as sensitive. Allegro also make linear halls.


Eric


-----Original Message-----
From: David Cooley <n5xmt at bellsouth.net>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Wednesday, December 01, 1999 9:19 PM
Subject: Re: TPS failures - better designs?


>I don't see how a hall effect device could be used as a TPS.  It senses the
>presence or absence of a magnetic field...  If it was to count pulses as
>the throttle shaft was rotated to determine position, that may work, until
>someone started the vehicle with their foot on the accelerator so it
>thought it was at zero when it was at 50%...
>
>
>At 01:19 PM 12/2/1999 +1100, you wrote:
>>Dear EFI gurus,
>>
>>I was at the wreckers (bone yard?) yesterday. Seems
>>that the Throttle Position Sensor is a common point
>>of failure. Being a novice when it comes to GM EFI
>>hardware, I figured that a better design than a simple
>>pot (potentiometer, or "variable resistor") was in
>>order. Having recently played with a Hall Effect sensor,
>>for ignition pickup, I also figured that a simple TPS,
>>both reliable and robust, could be done cheaply and
>>easily with just such a Hall Effect device.
>>
>>As we all know, "there's nothing new under the sun"...
>>So, here's the EFI content:
>>
>>   Are there any Hall effect TPS sensors around?
>>
>>Or, perhaps a better question is:
>>
>>   Are there more reliable TP sensors than simple pots?
>>
>>TIA,
>>--
>>Peter Gargano
>
>===========================================================
>David Cooley N5XMT Internet: N5XMT at bellsouth.net
>Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
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