Vehicle speed limitation.
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Posts: 46,084
i want to limit the speed of a vehicle fitted with a six cylinder carbureted engine, using a bs2 reading a signal from a proximity sensor monitoring wheel speed.
does anyone know how to take a signal from the stamp and use it to interupt the engine's ignition spark when the vehicle reaches the desired speed?
regards,
keith moore.
does anyone know how to take a signal from the stamp and use it to interupt the engine's ignition spark when the vehicle reaches the desired speed?
regards,
keith moore.
Comments
gas/air mix into them and then sending it to the exhaust system.
the first spark or excess heat will ignite it explosively blowing the
muffler to shreds.
better use a servo or solenoid to pull the carb throttle plates a little
more closed.
or sound an alarm so loud and or bad sounding that the operator slows down
to relieve him/her self of the noise.
norm
>From: "Keith Moore" <keithmoore1@n...>
>Reply-To: basicstamps@yahoogroups.com
>To: <BASICSTAMPS@YAHOOGROUPS.COM>
>Subject: [noparse][[/noparse]basicstamps] VEHICLE SPEED LIMITATION.
>Date: Fri, 1 Jun 2001 08:18:17 -0400
>
>I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
>CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY SENSOR
>MONITORING WHEEL SPEED.
>DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO INTERUPT
>THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE DESIRED SPEED?
>REGARDS,
>KEITH MOORE.
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com
distributor, does just that. When the rev limiter is reached, it
selectivly starts to remove cylinders from the firing order in order
to cause the rpms to go down. It does not cut all of them off all at
once. Crane makes a MSD called a Fireball which has a rev limiter in
it, but you are actually looking for a speed limiter. You could
start to ground out the distributor with pulses low, assuming
electronic ignition. But I would stay away from the high voltage
stuff with the stamp.
-Rory.
--- In basicstamps@y..., "norman doty" <normdoty@h...> wrote:
> not a real good idea to interrupt the spark, the cyls will still be
drawing
> gas/air mix into them and then sending it to the exhaust system.
>
> the first spark or excess heat will ignite it explosively blowing
the
> muffler to shreds.
>
> better use a servo or solenoid to pull the carb throttle plates a
little
> more closed.
>
> or sound an alarm so loud and or bad sounding that the operator
slows down
> to relieve him/her self of the noise.
>
>
> norm
>
>
>
> >From: "Keith Moore" <keithmoore1@n...>
> >Reply-To: basicstamps@y...
> >To: <BASICSTAMPS@Y...>
> >Subject: [noparse][[/noparse]basicstamps] VEHICLE SPEED LIMITATION.
> >Date: Fri, 1 Jun 2001 08:18:17 -0400
> >
> >I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
> >CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
SENSOR
> >MONITORING WHEEL SPEED.
> >DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO
INTERUPT
> >THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE DESIRED
SPEED?
> >REGARDS,
> >KEITH MOORE.
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
>CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY SENSOR
>MONITORING WHEEL SPEED.
>DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO INTERUPT
>THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE DESIRED SPEED?
Keith,
For the speed sensing, just use a magnetic pickup. Your trigger wheel should
be iron, with one or more holes or teeth. The flywheel ring gear is very
convenient for this purpose. Output of the mag pickup is a pulse train,
which you can condition with an op-amp, and then have read by the stamp.
With some math, you can compute the engine RPM from the pulse train
frequency.
To limit the power, it is very common to simply retard the spark timing.
Note that this has very little effect if the engine is not loaded. To retard
the timing, most distributors have some form of vaccuum advance, e.g.,
timing advances as vaccuum in the intake manifold drops. You will need a
soleniod that you can switch by the stamp. The solenoid should go between
the distributor vaccuum advance mechanism and a source of vaccuum.
Finally, typing in all caps equates to shouting.
Regards,
Rob
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com
good idea since it will cause the engine to over heat if the timing is
retarded for very long. ·20-30 seconds is probably too long. ·Use caution
with this method.[/font]
>good idea since it will cause the engine to over heat if the timing is
>retarded for very long. 20-30 seconds is probably too long. Use caution
>with this method.
True! However, using the method I suggested, the timing cannot be retarded
more than the stock setting, unless the distributor were physically rotated.
The original author of the question did not state a time limit, so I
inferred momentary speed limiting.
Regards,
Rob
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com
the engine, you need to sense the speed of the tailshaft to have a speed
limit.
You can do it with 2 pulleys if you can rotate a plate with the 2 pulleys
mounted to it, fairly easy as can could mount it directly to the top of a
strong stepper motor. In normal operation the cable changes direction around
the pulleys, in overspeed the pulley plate turns and the cable straightens
out, thereby lengthening (if thats a word) the cable. When the speed comes
back into range the pulleys then turn back to shorten the throttle cable.
This way you don't have to have any interface to the distributor or HV
leads, and just put a sensor at a wheel or the tailshaft.
The downside is that you may have change your existing cable.
I'd be interested to know how it goes,
Regards, Chris.
fes@g...
Original Message
From: Rob Weinstock <weinstro@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, June 01, 2001 5:47 PM
Subject: Re: [noparse][[/noparse]basicstamps] VEHICLE SPEED LIMITATION.
> >I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
> >CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY SENSOR
> >MONITORING WHEEL SPEED.
> >DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO
INTERUPT
> >THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE DESIRED SPEED?
>
> Keith,
>
> For the speed sensing, just use a magnetic pickup. Your trigger wheel
should
> be iron, with one or more holes or teeth. The flywheel ring gear is very
> convenient for this purpose. Output of the mag pickup is a pulse train,
> which you can condition with an op-amp, and then have read by the stamp.
> With some math, you can compute the engine RPM from the pulse train
> frequency.
>
> To limit the power, it is very common to simply retard the spark timing.
> Note that this has very little effect if the engine is not loaded. To
retard
> the timing, most distributors have some form of vaccuum advance, e.g.,
> timing advances as vaccuum in the intake manifold drops. You will need a
> soleniod that you can switch by the stamp. The solenoid should go between
> the distributor vaccuum advance mechanism and a source of vaccuum.
>
> Finally, typing in all caps equates to shouting.
>
> Regards,
>
> Rob
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed with. Text in the Subject
and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
SENSOR MONITORING WHEEL SPEED.
> DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO
INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE
DESIRED SPEED?
> REGARDS,
> KEITH MOORE.
Hi Keith,
What I believe you want to implement is an electronic governor. This
is dangerous and needs many safeties built into the system. It would
have the additional benefit of speed control that you could possibly
alter on the fly.
Inputs would be vehicle speed (if a late model you may be able to tap
the speed sensor that exists), Your lead foot desires (Accelerator
pedal hooked to a pot.
Your output would be a servo driven throttle.
You better plan on multiple fail safes. Don't let the engine run away
while in park or reverse (noisy pot).
Like speed control a tap on the brake pedal should kill many things.
Remember you are about to take a 2000 lb mass that could kill a lot of
things if the system malfunctions the wrong way (remember to
waterproof the throttle servo)
This system should allow full throtle operation (with a quick
servo)and rapid acceleration right up to governed speed.
Good luck, Plan 6 times then execute this beast. I hope I don't run
into you,
Don Denhardt
explosion, burst muffler and a lot of rattled bystanders when the
ignition is partially or fully switched back on (not good)
Usually attempts to even partially stop or short out some of the
cylinders may result in the catalytic converter overheating and
possibly starting a car fire. GM had some problems in this area with
properly running engines
Usually attempts to modify the timing will foul the engine and
emissions equipment.
So take your pick, loud explosions (burst mufflers), car fires,
ruined
engines or emissions equipment or the possibility of killing folks if
the system runs away while in gear or engine parts and lots o oil in
the driveway if it does it in the driveway in park.
The only safe alternative would be to bleed off the power with
decompression valves located on a few or all cylinders (big job) or
rigging the engine with a second throttle valve assy (servo
controlled) that begins to close as desired speed is reached.
hmmmmmmmmmm.
I think it would be easier to fail safe an electronic governor. All
that would require is LOTS O Planning.
They do make mechanical governors, but the original question asked
was
how best to have a Stamp do it. The idea of tampering with ignition
just wont fly.
--- In basicstamps@y..., "Nick H" <lightclb@y...> wrote:
> Umm, this may be stupid, but I think there is a better(safer) way of
> implimenting this. Leave the throttle intact, still read from all
> appropriate inputs, and control spark. When conditions are right,
you could
> switch off spark. Most late model cars are equipped with some sort
of
> electronic ignition that would not be too difficult to interface
with.
>
> Just an idea, seems safer to me [noparse]:)[/noparse]
> -Nick
>
Original Message
> From: <dondenhardt@y...>
> To: <basicstamps@y...>
> Sent: Tuesday, June 12, 2001 12:38 PM
> Subject: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
>
>
> > --- In basicstamps@y..., "Keith Moore" <keithmoore1@n...> wrote:
> > > I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX
CYLINDER
> > CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
> > SENSOR MONITORING WHEEL SPEED.
> > > DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT
TO
> > INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE
> > DESIRED SPEED?
> > > REGARDS,
> > > KEITH MOORE.
> >
> > Hi Keith,
> >
> > What I believe you want to implement is an electronic governor.
This
> > is dangerous and needs many safeties built into the system. It
would
> > have the additional benefit of speed control that you could
possibly
> > alter on the fly.
> >
> > Inputs would be vehicle speed (if a late model you may be able to
tap
> > the speed sensor that exists), Your lead foot desires (Accelerator
> > pedal hooked to a pot.
> >
> > Your output would be a servo driven throttle.
> >
> > You better plan on multiple fail safes. Don't let the engine run
away
> > while in park or reverse (noisy pot).
> >
> > Like speed control a tap on the brake pedal should kill many
things.
> >
> > Remember you are about to take a 2000 lb mass that could kill a
lot of
> > things if the system malfunctions the wrong way (remember to
> > waterproof the throttle servo)
> >
> > This system should allow full throtle operation (with a quick
> > servo)and rapid acceleration right up to governed speed.
> >
> > Good luck, Plan 6 times then execute this beast. I hope I don't
run
> > into you,
> >
> > Don Denhardt
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed with. Text in
the
Subject
> and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> _________________________________________________________
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> Get your free @yahoo.com address at http://mail.yahoo.com
it is controlled by the on board computer. I don't believe it would
be as easy as you suggest to interface with it.
In essence what you are suggesting is to redesign the computer
controlled fuel and ignition system? The fella that originally wrote
said he had a carb, but many folks have mistaken a single
injector/throttle body for a carburetor.
1. I don't know if the BS 2 runs fast enough for that
2. None of the automotive companies will supply you with sufficient
documentation for you to bypass or interface with their systems.
--- In basicstamps@y..., "Nick H" <lightclb@y...> wrote:
> Umm, this may be stupid, but I think there is a better(safer) way of
> implimenting this. Leave the throttle intact, still read from all
> appropriate inputs, and control spark. When conditions are right,
you could
> switch off spark. Most late model cars are equipped with some sort
of
> electronic ignition that would not be too difficult to interface
with.
>
> Just an idea, seems safer to me [noparse]:)[/noparse]
> -Nick
>
Original Message
> From: <dondenhardt@y...>
> To: <basicstamps@y...>
> Sent: Tuesday, June 12, 2001 12:38 PM
> Subject: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
>
>
> > --- In basicstamps@y..., "Keith Moore" <keithmoore1@n...> wrote:
> > > I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX
CYLINDER
> > CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
> > SENSOR MONITORING WHEEL SPEED.
> > > DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT
TO
> > INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE
> > DESIRED SPEED?
> > > REGARDS,
> > > KEITH MOORE.
> >
> > Hi Keith,
> >
> > What I believe you want to implement is an electronic governor.
This
> > is dangerous and needs many safeties built into the system. It
would
> > have the additional benefit of speed control that you could
possibly
> > alter on the fly.
> >
> > Inputs would be vehicle speed (if a late model you may be able to
tap
> > the speed sensor that exists), Your lead foot desires (Accelerator
> > pedal hooked to a pot.
> >
> > Your output would be a servo driven throttle.
> >
> > You better plan on multiple fail safes. Don't let the engine run
away
> > while in park or reverse (noisy pot).
> >
> > Like speed control a tap on the brake pedal should kill many
things.
> >
> > Remember you are about to take a 2000 lb mass that could kill a
lot of
> > things if the system malfunctions the wrong way (remember to
> > waterproof the throttle servo)
> >
> > This system should allow full throtle operation (with a quick
> > servo)and rapid acceleration right up to governed speed.
> >
> > Good luck, Plan 6 times then execute this beast. I hope I don't
run
> > into you,
> >
> > Don Denhardt
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed with. Text in the
Subject
> and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
implimenting this. Leave the throttle intact, still read from all
appropriate inputs, and control spark. When conditions are right, you could
switch off spark. Most late model cars are equipped with some sort of
electronic ignition that would not be too difficult to interface with.
Just an idea, seems safer to me [noparse]:)[/noparse]
-Nick
Original Message
From: <dondenhardt@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, June 12, 2001 12:38 PM
Subject: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
> --- In basicstamps@y..., "Keith Moore" <keithmoore1@n...> wrote:
> > I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
> CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
> SENSOR MONITORING WHEEL SPEED.
> > DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO
> INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE
> DESIRED SPEED?
> > REGARDS,
> > KEITH MOORE.
>
> Hi Keith,
>
> What I believe you want to implement is an electronic governor. This
> is dangerous and needs many safeties built into the system. It would
> have the additional benefit of speed control that you could possibly
> alter on the fly.
>
> Inputs would be vehicle speed (if a late model you may be able to tap
> the speed sensor that exists), Your lead foot desires (Accelerator
> pedal hooked to a pot.
>
> Your output would be a servo driven throttle.
>
> You better plan on multiple fail safes. Don't let the engine run away
> while in park or reverse (noisy pot).
>
> Like speed control a tap on the brake pedal should kill many things.
>
> Remember you are about to take a 2000 lb mass that could kill a lot of
> things if the system malfunctions the wrong way (remember to
> waterproof the throttle servo)
>
> This system should allow full throtle operation (with a quick
> servo)and rapid acceleration right up to governed speed.
>
> Good luck, Plan 6 times then execute this beast. I hope I don't run
> into you,
>
> Don Denhardt
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed with. Text in the Subject
and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
throttle plate idea would be to implement. You'd start with a tube
whose I.D. is equal to or greater than the throat of the carb. Weld
flanges to mate it to the carb and intake manifold. Make up a
throttle plate and shaft with shaft bushings and a crank arm on the
outside. Welding and machine shops do a lot of work more inexpensivly
than you would think.
You'd have to road test to see at what angle of closure you can
restrict car speed to say 40 or 50. Install a limit at that point or
teach the servo not to close any further (Radio control servo - PWM).
The secondary throttle would be in the wide open position in all
cases except within 2-5 MPH to governed speed. At which point it
begins to close rapidly. Testing would establish the degree of
motion needed to govern.
You could even make it out of plastic plumbing parts. Some of the
blends tolerate heat very well. But the best would be metal.
Why?? You'd want to enclose your servo in an insulated box that
sorrounded the secondary throttle body.
The underhood temps can exceed your thermostat setting while standing
or shut off after a hot run. The incoming air (ducted from outside
air in most cars) would keep the servo chamber close to ambient air
temps. Running some of the ducted air through the chamber would be
better.
--- In basicstamps@y..., dondenhardt@y... wrote:
> Late model cars do employ a basic electronic ignition. Unfortunatly
> it is controlled by the on board computer. I don't believe it would
> be as easy as you suggest to interface with it.
>
> In essence what you are suggesting is to redesign the computer
> controlled fuel and ignition system? The fella that originally
wrote
> said he had a carb, but many folks have mistaken a single
> injector/throttle body for a carburetor.
>
> 1. I don't know if the BS 2 runs fast enough for that
>
> 2. None of the automotive companies will supply you with sufficient
> documentation for you to bypass or interface with their systems.
>
>
> --- In basicstamps@y..., "Nick H" <lightclb@y...> wrote:
> > Umm, this may be stupid, but I think there is a better(safer) way
of
> > implimenting this. Leave the throttle intact, still read from all
> > appropriate inputs, and control spark. When conditions are right,
> you could
> > switch off spark. Most late model cars are equipped with some sort
> of
> > electronic ignition that would not be too difficult to interface
> with.
> >
> > Just an idea, seems safer to me [noparse]:)[/noparse]
> > -Nick
> >
Original Message
> > From: <dondenhardt@y...>
> > To: <basicstamps@y...>
> > Sent: Tuesday, June 12, 2001 12:38 PM
> > Subject: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
> >
> >
> > > --- In basicstamps@y..., "Keith Moore" <keithmoore1@n...> wrote:
> > > > I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX
> CYLINDER
> > > CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
> > > SENSOR MONITORING WHEEL SPEED.
> > > > DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE
IT
> TO
> > > INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES
THE
> > > DESIRED SPEED?
> > > > REGARDS,
> > > > KEITH MOORE.
> > >
> > > Hi Keith,
> > >
> > > What I believe you want to implement is an electronic governor.
> This
> > > is dangerous and needs many safeties built into the system. It
> would
> > > have the additional benefit of speed control that you could
> possibly
> > > alter on the fly.
> > >
> > > Inputs would be vehicle speed (if a late model you may be able
to
> tap
> > > the speed sensor that exists), Your lead foot desires
(Accelerator
> > > pedal hooked to a pot.
> > >
> > > Your output would be a servo driven throttle.
> > >
> > > You better plan on multiple fail safes. Don't let the engine
run
> away
> > > while in park or reverse (noisy pot).
> > >
> > > Like speed control a tap on the brake pedal should kill many
> things.
> > >
> > > Remember you are about to take a 2000 lb mass that could kill a
> lot of
> > > things if the system malfunctions the wrong way (remember to
> > > waterproof the throttle servo)
> > >
> > > This system should allow full throtle operation (with a quick
> > > servo)and rapid acceleration right up to governed speed.
> > >
> > > Good luck, Plan 6 times then execute this beast. I hope I
don't
> run
> > > into you,
> > >
> > > Don Denhardt
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@y...
> > > from the same email address that you subscribed with. Text in
the
> Subject
> > and Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> >
> >
> > _________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at http://mail.yahoo.com
··· ·"· The Soft Touch drops spark one cylinder at a time until your engine is at or below its maximum rpm. Those cylinders are then fired on the next cycle to prevent them from loading up with fuel. The result is a smooth rev limiting action without all the rough stuff.·· "
Now I have been using this model rev limiter for about 2 years now, but I have been using the 6AL ignition ( 6420 ) for about 20 years. Witch works on analog, and they have never changed it ever since it was first made.
Now I do not think the BS2 has the speed, but I think the BS2p should. MSD came out with a Digital Ignition control ( Digital-6 Plus··· 6520 ) that runs on 15MHz. and if that thing can handle a 20 degree spark duration through 3,300 rpm, a single stage retard, a start retard, and two adjustable rev limiters, the BS2p should handle it.
For the one that asked the first question keep trying you will get it, Rome was not built in a day. Have Fun!!!
MSD's website···· http://www.msdignition.com/
the accelerator pedal. You will also need to interface with the speedometer.
If you can reliably get both of those then you would have a much easier task.
short time and the exhaust fills with unburnt fuel / air mixture !!
Chris
Original Message
From: Nick H <lightclb@y...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, June 13, 2001 7:21 AM
Subject: Re: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
> Umm, this may be stupid, but I think there is a better(safer) way of
> implimenting this. Leave the throttle intact, still read from all
> appropriate inputs, and control spark. When conditions are right, you
could
> switch off spark. Most late model cars are equipped with some sort of
> electronic ignition that would not be too difficult to interface with.
>
> Just an idea, seems safer to me [noparse]:)[/noparse]
> -Nick
>
Original Message
> From: <dondenhardt@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, June 12, 2001 12:38 PM
> Subject: [noparse][[/noparse]basicstamps] Re: VEHICLE SPEED LIMITATION.
>
>
> > --- In basicstamps@y..., "Keith Moore" <keithmoore1@n...> wrote:
> > > I WANT TO LIMIT THE SPEED OF A VEHICLE FITTED WITH A SIX CYLINDER
> > CARBURETED ENGINE, USING A BS2 READING A SIGNAL FROM A PROXIMITY
> > SENSOR MONITORING WHEEL SPEED.
> > > DOES ANYONE KNOW HOW TO TAKE A SIGNAL FROM THE STAMP AND USE IT TO
> > INTERUPT THE ENGINE'S IGNITION SPARK WHEN THE VEHICLE REACHES THE
> > DESIRED SPEED?
> > > REGARDS,
> > > KEITH MOORE.
> >
> > Hi Keith,
> >
> > What I believe you want to implement is an electronic governor. This
> > is dangerous and needs many safeties built into the system. It would
> > have the additional benefit of speed control that you could possibly
> > alter on the fly.
> >
> > Inputs would be vehicle speed (if a late model you may be able to tap
> > the speed sensor that exists), Your lead foot desires (Accelerator
> > pedal hooked to a pot.
> >
> > Your output would be a servo driven throttle.
> >
> > You better plan on multiple fail safes. Don't let the engine run away
> > while in park or reverse (noisy pot).
> >
> > Like speed control a tap on the brake pedal should kill many things.
> >
> > Remember you are about to take a 2000 lb mass that could kill a lot of
> > things if the system malfunctions the wrong way (remember to
> > waterproof the throttle servo)
> >
> > This system should allow full throtle operation (with a quick
> > servo)and rapid acceleration right up to governed speed.
> >
> > Good luck, Plan 6 times then execute this beast. I hope I don't run
> > into you,
> >
> > Don Denhardt
> >
> >
> >
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