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'[OT] Speed Sensor'
1999\07\12@103421 by Wagner Lipnharski

picon face
Does anyone knows some supplier for "speed transducer" to be installed
at the car speedometer cable?
My circuit needs to receive a frequency proportional to the car speed,
and I need to find out ... well... cheap sensors... :)

Thanks
Wagner Lipnharski
http://www.ustr.net

1999\07\12@105248 by Michael Rigby-Jones

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face
Are you after some kind of universal fitting device?  A lot of cars these
days don't have speedo cables anymore, instead they use a sensor of the type
you need that give out a pulse train with frequency proportional to speed.

The old fuel computers (I have old "Smiths" device with an original GE PIC
in it!!) used a ring of magnets attched to either the prop shaft for RWD
cars or to one of the drive shafts on a FWD car, and had a simple inductive
pickup mounted on a bracket.  If you use this method it's important to take
into account any suspension movement that may either stop the sensor
working, or knock it of it's bracket!

Regards

Mike Rigby-Jones

> {Original Message removed}

1999\07\12@182809 by Des Bromilow

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Is it worth building soemthing based on exisitng speedo ideas?

a rotating magnet pulls the needle against a spring..

Why not use the rotating magnet to generate pulses, or to generate an average DC voltage (which could be fed into a PLL VCO)

Just batting ideas around.

Des

>>> Wagner Lipnharski <spam_OUTwagnerlTakeThisOuTspamEARTHLINK.NET> 7/13/99 12:32:07 am >>>
Does anyone knows some supplier for "speed transducer" to be installed
at the car speedometer cable?
My circuit needs to receive a frequency proportional to the car speed,
and I need to find out ... well... cheap sensors... :)

Thanks
Wagner Lipnharski
http://www.ustr.net

1999\07\13@012200 by Riaz Ahamed

picon face
 You can use a reed relay for this pupose. It's cheap!

thanks
Riaz

Des Bromilow wrote:

> Is it worth building soemthing based on exisitng speedo ideas?
>
> a rotating magnet pulls the needle against a spring..
>
> Why not use the rotating magnet to generate pulses, or to generate an average
DC voltage (which could be fed into a PLL VCO)
{Quote hidden}

1999\07\13@072507 by Russell McMahon

picon face
Commercial units often use a rotating magnet and either  e reed
switch or a hall cell. Units are available which screw onto where the
cable usually goes and the cable screw into the back of them.

A magnet and a coil could be used allowing an opamp to register speed
down to some lower speed when the signal becomes too small to be
reliable. Differential input and appropriate magnet and coil would
allow this to be very low. If you have access to the inside of the
speedometer you could possibly sense the existing magnet. Depending
on speed of response (and the purpose you could sense the odometer
(distance meter) movement in some manner.



RM



{Original Message removed}

1999\07\13@092154 by Wagner Lipnharski

picon face
It will be the day when all cars, doesn't matter the manufacturer, would
follow some nice and easy standards... as for example a simple and
efficient engine computer interface, or a dash board panel digital
communication, so any kind of new attachments could be easy installed...
as a speed sensor that would use one specific pin on the extension
connector, based on a frequency that is equivalent to Inches/Second, or
perhaps if it is to be advanced... centimeters/second... <g>.

Wagner

1999\07\13@093717 by Andy Kunz

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face
>It will be the day when all cars, doesn't matter the manufacturer, would
>follow some nice and easy standards... as for example a simple and
>efficient engine computer interface, or a dash board panel digital
>communication, so any kind of new attachments could be easy installed...

OBD-3?

Andy
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1999\07\13@094932 by Wagner Lipnharski

picon face
That's right.

Months ago I tried to find out that specific protocol, and found
nothing... the only thing found was lots of text about the protocol
message codes, and advertizement, nothing related to the communication
layers itself.
It would be really nice to have an extended message on board, other than
"Service Engine Soon"... :)
Wagner.



EraseMEjamespspam_OUTspamTakeThisOuTintertex.net wrote:
{Quote hidden}

[snip]

1999\07\13@095544 by Andy Kunz

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At 09:48 AM 7/13/99 -0400, you wrote:
>That's right.
>
>Months ago I tried to find out that specific protocol, and found
>nothing... the only thing found was lots of text about the protocol

I believe you can get it if you are an ASE Certified Mechanic.

Andy

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1999\07\13@102052 by Wagner Lipnharski

picon face
I know what you mean Andy, thanks, but this kind of thing makes me
sick.  It is the same as if to play with a PIC or any other
microcontroller you should be an Electronic Engineer, Harvard certified,
or, to be able to open your PC and replace the video card you sould have
a Computer Science Degree at the wall...  now, if it is true (and I
think your guessing is true) an ASE certified Mechanic must be able to
build a computer, develop hardware and software layers to deal with the
OBD protocol... one word to define who set those rules: "RIDICULOUS!"

Wagner


Andy Kunz wrote:
{Quote hidden}

1999\07\13@115216 by Andy Kunz

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>a Computer Science Degree at the wall...  now, if it is true (and I
>think your guessing is true) an ASE certified Mechanic must be able to

I was told this when I inquired about the spec.

Andy

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1999\07\13@123954 by eplus1

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SAE standard J1850 is available for $59 from
http://www.sae.org/products/standards/J1850_199611.htm "This SAE Standard
establishes the requirements for a Class B Data Communication Network
Interface applicable to all on and off- road land based vehicles. "

ISO9141/2 is available for $28 at
http://www.sae.org/products/standards/ISO9141_2.htm "This part of ISO 9141
describes a subset of ISO 9141:1989. It specifies the requirements for
setting up the interchange of digital information between on-board
emission-related Electronic Control Units (ECUs) of road vehicles and the
SAE OBD II scan tool as specified in SAE J1978."

But as http://www.northstarlabs.com/rp6.htm notes, there is significant
divergence in the implementation of the physical layer used by auto mfgrs
between SAE J1850 and ISO-9141

http://www.obd-ii.com/ is the ODB-II home page "Dedicated to helping the
home and independent technician
understand and use OBD-II technology." Well... actually they sell a $250
PC-Auto interface. They do list the DTC codes however.

James Newton, webmaster http://get.to/techref
RemoveMEjamesnewtonspamTakeThisOuTgeocities.com <jamesnewtonEraseMEspam.....geocities.com>
1-619-652-0593 phoneÊ



> {Original Message removed}

1999\07\13@132323 by Reginald Neale

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Wagner said:

>It will be the day when all cars, doesn't matter the manufacturer, would
>follow some nice and easy standards... as for example a simple and
>efficient engine computer interface, or a dash board panel digital
>communication, so any kind of new attachments could be easy installed...
>as a speed sensor that would use one specific pin on the extension
>connector, based on a frequency that is equivalent to Inches/Second, or
>perhaps if it is to be advanced... centimeters/second... <g>.
>


You're right, Wagner. Standards are bad; STANDARD - in the singular - is
good. The real issue is "who gets to decide?" None of the vendors wants to
risk their market share by adopting someone else's protocol as a standard.

In the last century when public fire protection systems were just beginning
to be adopted, every company that made hydrants and hoses used their own
sizes and threads, incompatible with everyone else. They hoped to dominate
the market by forcing everyone to use their system as "standard." Many
houses burned down as firefighters stood helplessly watching, because they
did not have an appropriate adapter for the nearby hydrant.

It was only when the insurance companies threatened to stop writing fire
insurance policies that the hardware mfrs agreed to begin cooperating. Who
will play that role in the automotive industry?

Reg Neale

1999\07\13@135238 by Andy Kunz

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face
>It was only when the insurance companies threatened to stop writing fire
>insurance policies that the hardware mfrs agreed to begin cooperating. Who
>will play that role in the automotive industry?

Police will refuse to ticket motorists who do not drive compliant vehicles.
In order to maintain the gov't's revenue stream, a single standard will be
mandated by Congress which will permit the government's tax assessor (aka
Police Officer) to download from the vehicle the data which corroborates
the officer's contention that the vehicle was traveling with an excessive
speed.

Andy

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1999\07\13@180259 by Eric Oliver

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face
Now that's a scary thought !

On Tuesday, July 13, 1999 12:51 PM, Andy Kunz [SMTP:RemoveMEsupportspam_OUTspamKILLspamMONTANADESIGN.COM] w
rote:
{Quote hidden}

1999\07\13@183254 by Wagner Lipnharski

picon face
Not only that, but all kind of useful info could be retrieved by a
mapped memory sensors from, lets say, last 5 minutes of driver's and
car's activities... as speed, gas and break pedals position, steering
whell movements and so on... actually it is *sooo* easy to collect and
store, that it could solve several doubts and discussions in case of
accidents and so on.  A simple graph of steering wheel activities could
(without much guessing) the driver's DUI status...

Let's see; if a video camera can be used to register and help to make a
person inocent or guilty, what is the problem to record a car's
activities?  We are not talking about personal matters, or private
things... when on the streets guiding a two thousand lb mass of metal it
is a public matter, and this is why laws were done, so, I believe that
any possible way to make the law be respected is a positive point, if
not, is better to return to the caves... and don't forget the dry
matches to be able to have a nice night fire... and a nice sharp rocky
knife to hunt that ugly bear...

Want more?  I would vote to have a law to analyze a person's driving
ability, based on the info from the on-board computer download...
Stored by months... :)

To start the car's engine you need to insert your driver's license on
the dash board "Driver's ID" receptacle, so it would know who is
driving.

It makes you think about some futuristic movie?  The car's
on-board-computer talking to you:

"You just lost more 3 points by speeding the street limit, now you have
only 28 until you loose your license... this penalty just withdraw
automatically $110 from your bank account"

"You just lost more 2 points by changing lanes in a continuous white
stripe... now you have only 26 points until you loose your license...
this penalty just withdraw automatically $110 from your bank account"

"You just lost more 1 point by tailgating the car in front of you... now
you have only 25 points until you loose your license... this penalty
just withdraw automatically $20 from your bank account"


haha... long life to technology... :)

... may we suggest it to the government?  would them appreciate the
idea?

All of you know that this is totally possible to implement right now.

Wagner.

[snip]
> > Police will refuse to ticket motorists who do not drive compliant vehicles.
> >  In order to maintain the gov't's revenue stream, a single standard will be
> > mandated by Congress which will permit the government's tax assessor (aka
> > Police Officer) to download from the vehicle the data which corroborates
> > the officer's contention that the vehicle was traveling with an excessive
> > speed.

1999\07\13@195143 by Tracey DeChambeau

picon face
Wagner,
What do you want to know?  Since 98 all cars are required to use the same
terminology, connector and type of interface, couldn't be much more uniform
than it already is.  I don't here people complaining about a gillion
different drivers for hardware or the incompatibility of OS, not to mention
the differences in comp. hardware.
Tracey,
Master ASE, NISSAN and MITSUBISHI Tech.

1999\07\13@200610 by Bob Blick

face
flavicon
face
On Tue, 13 Jul 1999, Wagner Lipnharski wrote:

> Not only that, but all kind of useful info could be retrieved by a
> mapped memory sensors from, lets say, last 5 minutes of driver's and
> car's activities... as speed, gas and break pedals position, steering

> "You just lost more 3 points by speeding the street limit, now you have
> only 28 until you loose your license... this penalty just withdraw
> automatically $110 from your bank account"

Starting in 2005 with OBD-III it will be even worse than you think. Your
car can be shut down remotely. More data will be stored. Currently with
OBD-II it has the capacity to store 40 freeze-frames when an "event"
occurs, but most driving-related events will not trigger it(except airbags
and excessive powertrain speed) and also no time or datestamping. But
OBD-II is like a cop riding along with you(or behind you with his remote
kill switch). Wait til the script-kiddies figure out that one.

-Bob

1999\07\13@203101 by Tracey DeChambeau

picon face
t only that, but all kind of useful info could be retrieved by a
mapped memory sensors from, lets say, last 5 minutes of driver's and
car's activities... as speed, gas and break pedals position, steering
whell movements and so on... actually it is *sooo* easy to collect and
store, that it could solve several doubts and discussions in case of
accidents and so on.  A simple graph of steering wheel activities could
(without much guessing) the driver's DUI status..

Let's see; if a video camera can be used to register and help to make a
person inocent or guilty, what is the problem to record a car's
activities?  We are not talking about personal matters, or private
things... when on the streets guiding a two thousand lb mass of metal it
is a public matter, and this is why laws were done, so, I believe that
any possible way to make the law be respected is a positive point, if
not, is better to return to the caves... and don't forget the dry
matches to be able to have a nice night fire... and a nice sharp rocky
knife to hunt that ugly bear...

Want more?  I would vote to have a law to analyze a person's driving
ability, based on the info from the on-board computer download...
Stored by months... :)

To start the car's engine you need to insert your driver's license on
the dash board "Driver's ID" receptacle, so it would know who is
driving.

It makes you think about some futuristic movie?  The car's
on-board-computer talking to you:

"You just lost more 3 points by speeding the street limit, now you have
only 28 until you loose your license... this penalty just withdraw
automatically $110 from your bank account"

"You just lost more 2 points by changing lanes in a continuous white
stripe... now you have only 26 points until you loose your license...
this penalty just withdraw automatically $110 from your bank account"

"You just lost more 1 point by tailgating the car in front of you... now
you have only 25 points until you loose your license... this penalty
just withdraw automatically $20 from your bank account"


haha... long life to technology... :)

... may we suggest it to the government?  would them appreciate the
idea?

All of you know that this is totally possible to implement right now.

Wagner.
 But you are forgeting about the ACLU, personal freedom and the right to
privacy....
Tracey

1999\07\13@205810 by Reginald Neale

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 Wagner said:

>"You just lost more 3 points by speeding the street limit, now you have
>only 28 until you loose your license... this penalty just withdraw
>automatically $110 from your bank account"
>
>"You just lost more 2 points by changing lanes in a continuous white
>stripe... now you have only 26 points until you loose your license...
>this penalty just withdraw automatically $110 from your bank account"
>
>"You just lost more 1 point by tailgating the car in front of you... now
>you have only 25 points until you loose your license... this penalty
>just withdraw automatically $20 from your bank account"
>
>
>haha... long life to technology... :)

 I read of a half-serious suggestion that every vehicle be equipped
 with an "idiot gun," that would fire paint pellets at other
 vehicles. If you encounter another vehicle doing something idiotic,
 you fire your idiot gun at it and it leaves a mark. Everybody
 would accumulate a few marks because we all do something stupid
 once in a while.  But if you saw a vehicle coming down the road
 that was covered with them, you'd give it a wide berth.

 Hmmmm.... maybe it could be PIC-controlled...

 Reg Neale

1999\07\13@211518 by Tony Nixon

flavicon
picon face
Bob Blick wrote:

> Starting in 2005 with OBD-III it will be even worse than you think. Your
> car can be shut down remotely. More data will be stored. Currently with

It makes me wonder. All this 'safe' technology going into cars. Does it
really help to have 895 PIC 2010XXX processors 'looking after' our
driving habits, or is it slowly eroding our abillity to drive a car with
confidence? A lot of commuters think they can drive a car, until
something happens out of the ordinary, and then they find out they
can't. It's amazing that upteen zillions of dollars can be spent on
gizmos for cars, but no one is interested in going back to basics and
making sure the driver is capable of driving in the first place, and to
do this on a regular basis.

That's progress I suppose.

It probably sounds silly to some, but I regularly 'throw' my car around
just so I know how it handles in wierd situations. (When it's safe to do
so of course)

Speaking of cars, I've just been told that I may have to come up with
something to remote control a car travelling at 100KPH. I wonder if a
PIC is up to the task.

--
Best regards

Tony

'The Engine' - Design your own programmer.

http://www.picnpoke.com
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1999\07\13@213220 by Dave VanHorn

flavicon
face
> Starting in 2005 with OBD-III it will be even worse than you think. Your
> car can be shut down remotely. More data will be stored. Currently with
> OBD-II it has the capacity to store 40 freeze-frames when an "event"
> occurs, but most driving-related events will not trigger it(except airbags
> and excessive powertrain speed) and also no time or datestamping. But
> OBD-II is like a cop riding along with you(or behind you with his remote
> kill switch). Wait til the script-kiddies figure out that one.


I think I need to visit a dealer in say, mid-04 for a new car. :)

1999\07\14@003329 by Anne Ogborn

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face
hmm...

  Annie's just glad she's driving an 88 Dodge Caravan, whose
smartest electronics is probably something along the lines of
the uctrlr dealing with the fuel - air mix.


--
Anniepoo
Need loco motors?
http://www.idiom.com/~anniepoo/depot/motors.html

1999\07\14@003755 by Bob Blick

face
flavicon
face
>> OBD-II is like a cop riding along with you(or behind you with his remote
>> kill switch). Wait til the script-kiddies figure out that one.

Oops I meant OBD-III, the one starting in 2005. Sorry.

-Bob

1999\07\14@010408 by Tony Nixon

flavicon
picon face
Anne Ogborn wrote:
>
> hmm...
>
>    Annie's just glad she's driving an 88 Dodge Caravan, whose
> smartest electronics is probably something along the lines of
> the uctrlr dealing with the fuel - air mix.

I'm happy with my ol' 48 Harley and 50 something FJ ute. Less wires than
a farm fence, and a valve in the radio which doubles as a demister :-)

--
Best regards

Tony

'The Engine' - Design your own programmer.

http://www.picnpoke.com
Email picnpokeSTOPspamspamspam_OUTcdi.com.au

1999\07\14@094845 by Margo Erickson

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face
Wow, what a great idea!  Just what we all need is more government
control in our lives.  The government will take care of us all!  Yes, more
laws!!!  You must live in the Peoples Republic of Massachusetts.

>Want more?  I would vote to have a law to analyze a person's driving
>ability, based on the info from the on-board computer download...
>Stored by months... :)

1999\07\14@094851 by Wagner Lipnharski

picon face
You see, no public technical information available about ODB's protocol.
Probably we have more cars with ODB's on the street than IR VCR
remote... we know everything about the IR remotes, classified by
manufacturer and so on, nothing about ODB's.  Is this a "cartel" or
what?  How can technology advance if people still hiding it?

Other point:  I read in some sport car's magazine, about a device that
reprogram your car's engine computer to increase efficience from 10 to
30% and also saves fuel.  Ok, they say it reprograms the computer much
better than the factory does... let's see... it means that my car's
manufacturer did intentionally a bad programming in by car's engine
computer? and that they could do it better today and save gas, but they
choose not to do?  it means I can sue them, right?  we go back to the
ridiculous discussion about "When we release the new version we don't
care (and we will not be responsible) anymore for the previous one..."

Wagner.

1999\07\14@103043 by Andy Kunz

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>Speaking of cars, I've just been told that I may have to come up with
>something to remote control a car travelling at 100KPH. I wonder if a
>PIC is up to the task.

Penn State has an autonomous that drives 30 mph on campus.

R/C cars (18" long) have hit 100kph and higher.

R/C boats are now over 115 MPH.

Andy

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1999\07\14@142525 by Eric Smith

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Wagner Lipnharski <EraseMEwagnerlspamEraseMEEARTHLINK.NET> wrote:
> Other point:  I read in some sport car's magazine, about a device that
> reprogram your car's engine computer to increase efficience from 10 to
> 30% and also saves fuel.  Ok, they say it reprograms the computer much
> better than the factory does... let's see... it means that my car's
> manufacturer did intentionally a bad programming in by car's engine
> computer? and that they could do it better today and save gas, but they
> choose not to do?  it means I can sue them, right?  we go back to the
> ridiculous discussion about "When we release the new version we don't
> care (and we will not be responsible) anymore for the previous one..."

No, it means that their first priority was emissions (required by law), and
that their second priority was fuel economy (no legal minimum, although if
you fall below a certain level, there is a "gas guzzler" tax).

Or did the magazine claim that the car would still meet emissions
requirements?

There are many other factors that may be involved also, such as temperature
(of the engine, and ambient), wear, etc.  It's not as simple a decision as
"let's make the engine inefficient to screw the customer".  What motivation
would they have for that?

1999\07\14@144629 by Andy Kunz

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face
>There are many other factors that may be involved also, such as temperature
>(of the engine, and ambient), wear, etc.  It's not as simple a decision as
>"let's make the engine inefficient to screw the customer".  What motivation
>would they have for that?

Exxon could, I'm sure, give an incentive.

After all, those super-efficient vehicles have been bought from small-time
guys by the car companies, not the fuel companies.

It's a conspiracy.

Andy

(Hey, lighten up, I started this as a JOKE)!


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1999\07\14@144830 by Adam Davis

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Well, let's say that if they lower the mpg of each car by from 29 to 28.5 for
ten thousand cars which are annually driven 20,000 miles, then their customers
must buy at least 120 thousand gallons of gas more per year than they would
otherwise.  Guess who would be 'donating' money to the car company (or at least
the few involved engineers...;-)?

Not that that's happening, but you did ask what motivation they might have, this
could be one.


-Adam

Eric Smith wrote:
{Quote hidden}

1999\07\14@152025 by Bob Blick

face
flavicon
face
On Wed, 14 Jul 1999, Adam Davis wrote:
> Well, let's say that if they lower the mpg of each car by from 29 to 28.5 for

I'd be happy with either of those figures!

I have a suspicion that Eric is right, that emissions is job 1 and economy
is job 2. There are fleet requirements for overall fuel economy, so
increasing fuel economy on one model lets you decrease it on another.
American car makers figure the only market they have is for big powerful
cars, so they are always fighting to get the best economy they can, and
carry a few imported models with their name on them to bring the fleet
mileage up. Even with GM's new Buick factory in China, it won't be making
small cars, they'll still buy the small cars from other companies and
relabel them.

The rules for small trucks and 'utes(SUV) are different. They can be pigs.

-Bob

1999\07\14@192846 by Tony Nixon

flavicon
picon face
Andy Kunz wrote:
>
> Penn State has an autonomous that drives 30 mph on campus.
>
> R/C cars (18" long) have hit 100kph and higher.

I've got to make a 1600Kg beast do the same. Reminds me of Jimmy Stewart
and The Flight Of The Pheonix.



--
Best regards

Tony

'The Engine' - Design your own programmer. It's FREE

http://www.picnpoke.com
Email TakeThisOuTpicnpoke.....spamTakeThisOuTcdi.com.au

1999\07\14@201033 by Dennis Plunkett

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face
At 09:25 15/07/99 +1000, you wrote:
{Quote hidden}

Will you also be limited to daytime testing only due to the noise that you
create?


Dennis

1999\07\14@212541 by Tracey DeChambeau

picon face
Wagner Lipnharski <.....wagnerlspamRemoveMEEARTHLINK.NET> wrote:
> Other point:  I read in some sport car's magazine, about a device that
> reprogram your car's engine computer to increase efficience from 10 to
> 30% and also saves fuel.  Ok, they say it reprograms the computer much
> better than the factory does... let's see... it means that my car's
> manufacturer did intentionally a bad programming in by car's engine
> computer? and that they could do it better today and save gas, but they
> choose not to do?  it means I can sue them, right?  we go back to the
> ridiculous discussion about "When we release the new version we don't
> care (and we will not be responsible) anymore for the previous one..."
Please don't be offended, but do you believe everything you read?

No, it means that their first priority was emissions (required by law), and
that their second priority was fuel economy (no legal minimum, although if
you fall below a certain level, there is a "gas guzzler" tax).

Yes, there is a minimum fuel economy standard Called the CAFE standard, and
if it was so easy to make cars more powerful and fuel efficient you wouldn't
hear the manufactures complaining about complying.
   It costs millions of dollars every year to meet emission standards, not
something the car magazine people are likely to attempt.


There are many other factors that may be involved also, such as temperature
(of the engine, and ambient), wear, etc.  It's not as simple a decision as
"let's make the engine inefficient to screw the customer"

Absolutely, the Mitsubishi Galant failed to pass in it's original version,
1994 model year, because of the tires it had, requiring a tire manufacture
change, the tests the EPA uses are very elaborate and complete tests of the
entire vehicle not just the tailpipe like some tests performed around the
country at "Tag" time.
Tracey DeChambeau,
Master ASE Technician
Master NISSAN Technician
Master Mitsubishi Technician (expired)

1999\07\15@185211 by Dennis Plunkett

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At 21:21 14/07/99 EDT, you wrote:
{Quote hidden}

Is that so!
Humm. let me see the 1988-1992 buick 3.8 litre V6 is a good example of not
caring what the emissions are!
I think that we should get back to the original artical, and ask the
question "What do you mean by 30% more efficent", and you may get the
resoponse that it is better under some rediculus high speed high reving
situation, no hard for ANYONE to reach. These adds in these types of mags
are aimed at the stuipd (Personal opinion only).
But on your basic somments I agree, I have lost large amounts of hair in
attempts to get engines and controllers operating within a manufacturing
environment at the highest possible level of efficency thoughout the engine
life and all sorts of conditions (At least we don't have to deal with long
term sub zero temperatures, and high changes in tourque requirements)

Dennis

1999\07\16@010155 by Harold & Kristi Anderson

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-----Original Message-----
From: Wagner Lipnharski <spamBeGonewagnerl@spam@spamspam_OUTEARTHLINK.NET>
To: TakeThisOuTPICLISTspamspamMITVMA.MIT.EDU <PICLISTEraseMEspamMITVMA.MIT.EDU>
Date: Monday, July 12, 1999 9:39 AM
Subject: [OT] Speed Sensor


>Does anyone knows some supplier for "speed transducer" to be installed
>at the car speedometer cable?
>My circuit needs to receive a frequency proportional to the car speed,
>and I need to find out ... well... cheap sensors... :)
>
>Thanks
>Wagner Lipnharski
>http://www.ustr.net
>

You could tap the VSS line that runs from the transmission to the computer
on modern cars. That's how the add on cruise control systems work.  I found
the connector pinout for my car online, but I don't remember the address
anymore.

Harold Anderson
Lawton, OK

1999\07\16@073714 by Tracey DeChambeau

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In a message dated 7/16/99 1:02:40 AM Eastern Daylight Time,
RemoveMEandersnhEraseMEspamspam_OUTIONET.NET writes:

<<

>Does anyone knows some supplier for "speed transducer" to be installed
>at the car speedometer cable?
>My circuit needs to receive a frequency proportional to the car speed,
>and I need to find out ... well... cheap sensors... :)
>
>Thanks
>Wagner Lipnharski
>http://www.ustr.net
>
 >>
What year/make/model car do you have?
Tracey

1999\07\16@094535 by Wagner Lipnharski

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It is not for my car, but for a product to be released at the market.
Wagner.

Tracey DeChambeau wrote:
{Quote hidden}

1999\07\16@202405 by Tracey DeChambeau

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In a message dated 7/16/99 9:46:08 AM Eastern Daylight Time,
EraseMEwagnerlspam@spam@EARTHLINK.NET writes:

<< It is not for my car, but for a product to be released at the market.
Wagner. >>
well if you want it to hook to a speedo cable, there are still many different
styles, you'd need to pick one and work it out from there.
Most any cruise control manufacture's make sensors that fit inline or at the
couplings, if you just need a few to play with probably the cheapest way to
get on is from the junkyard, look for pre 85 chevys and Nissan maxima's both
have them mounted up near the bulckhead and are easy to get to.
The Nissan on is a sine wave generator, the chevy style is a pulsed reed
switch, requiring an external power supply

1999\07\21@110459 by Wagner Lipnharski

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Thanks for everyone who responded to this subject.
Even doing extensive research in the market, I was not able to find a
supplier of such mechanical piece (the one that you just install in
between the speedometer cable and the engine).
Wagner.

1999\07\21@210414 by Tracey DeChambeau

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What kind of fittings, thread pitch size, etc., and what kind of coupling.
I'm sure I could come up with something for you.
Tracey

1999\07\21@211422 by Wagner Lipnharski

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There is nothing specific, it would require several different couplings
for different car brands and models. What do you have in mind?
Wagner

Tracey DeChambeau wrote:
>
> What kind of fittings, thread pitch size, etc., and what kind of coupling.
> I'm sure I could come up with something for you.
> Tracey

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