What SU stands for

[Michael J. Kupec]

In the aircraft simulator arena - LVDT stands for Low Voltage Displacement
Transducer - basically an air core variable transformer that used an AC
frequency on the primary side.  A metal rod was slid through the core
causing a voltage shift in the center tapped secondary that has its outputs
feeding a pair of op-amps creating a differertial signal.
ie: one side goes positive and the opposite goes negative when the rod is
slid one way and vice versa when the rod is slid the other way.

There's more to it, but that's basically what it is. Been out of the
simulator field for twelve years so the theory is a bit rusty.

Michael J. Kupec
mkupec at erols.com
http://members.xoom.com/BroncoMike

I live with constant fear and danger every day...
    and sometimes she lets me go four-wheeling!

Get in, Sit down, Shut up, and Hold on!

It's a Bronco thing, They wouldn't have a clue!

Management & Data Systems, Lockheed Martin Corporation
Woodbridge, Virginia, USA (703) 680-6903
1970 Bronco w/351W (in a constant state of disassembly/refinement...)
1964 1/2 260 Convertible  w/PS, PB, & Power Top
1965 289 HP "K" Coupe w/PS, PB, & Pony Int. (Early '65, not a GT)

-----Original Message-----
From: mrvette <mrvette at bellsouth.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, July 08, 1998 8:02 PM
Subject: Re: What SU stands for


>just how complicated was this analogue computer?  what inputs did it use?
was
>it based on silicon technology?  use chips?   what is an LVDT?  same as a
MAP
>sensor? did it have fuel injecters like what we see today?  GENE
>
>Chris Rhodin wrote:
>>
>> My 1972 Renault R-17 had Bosch D-Jetronic fuel injection in it.  This was
an all electronic (with the exception of the thermo-time switch) system that
I've seen in VWs from the late-sixties.  It used an LVDT to measure the
manifold pressure and an analog computer to set the pulse width, the
distributor had an extra set of contacts that provided timing information to
the computer.  By the mid-seventies Bosch had moved away from the electronic
systems in favor of the mechanical CIS systems.
>>
>> As far as I know this is the earliest all electronic FI produced in
volume (emphasis on volume).
>>
>> Chris
>>
>> ----------
>> From:   mrvette
>> Sent:   Wednesday, July 08, 1998 14:05
>> To:     diy_efi at efi332.eng.ohio-state.edu
>> Subject:        Re: What SU stands for
>>
>> Mike Morrin wrote:
>> >
>> > At 07:26 8/07/98 -0400, mrvette wrote:
>> > >.....the only
>> > >ones who showed the slightest talent in the electronics field were the
>> > Germans,
>> > >and they were about 10 years behind us....
>> >
>> > So the US manufatcturers had EFI in volume production in the late 1950s
did
>> > they?? you learn something new every day.
>> >
>> > Mike
>>
>> Detroit has always been interested in electronics, much more so than
>> others...Bendix electro-pulse...with Chrylser,  wouldn't run long, rushed
into
>> production too soon,  based on current tech of times....Germanium
>> transistors....bad stability...no good..in time...
>> worked for a few months, then was too unstable to get reliability...
>>
>> GM gave Bendix in Newport News Va.  some Caddy engines to work with,
>> around the earliest 70's...and the result was that analogue early
proprietary
>> silicon chip based system on the Sevilles mostly and a very few other
caddys....
>>
>> that was a good system, but the technology is outdated now and parts are
>> NLA...but it's only been 25 years....:-)))
>>
>> so then the advent of modern computer chips...the rest is history....
>>
>> Now where do the germans fit into this early work.....OH yeh the old
mechanical
>> type   sort of like that old Rochester on the vettes...
>>
>> the Datsuns had some systems out in the late 70's   similar to the caddy
system
>> as I recall...been a while since I worked with one of them....
>>
>> GENE
>>
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