ECU projects
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Posts: 46,084
Hi guys,
I've been a bit slack reading this group lately but I've been thinking about
making a BS1 ECU for my lawnmower for a few months now and now you've got me
thinking about it again....
How's this for a dumb idea...
I need a portable 12v power and compressor setup for use in the forest for
servicing my rally car....
A motor mower engine will be hooked up to an old car alternator and an air
conditioning compressor. The compressor is hooked up to a BBQ gas bottle
giving me a supply of compressed air to run a "rattle gun". The alternator
will run the work lights.
The Stamp is used to run the engine as follows:
Use PWM to drive an old remote contol cars servo motor to open and close the
throttle.
Keep the existing magneto ignition for simplicity.
The stamp also fires the injector (not timed to the engine rpm) -
carburettors aren't!
Monitor engine rpm and increase/decrease fuel as appropriate to keep engine
running at the correct rpm (idle).
As soon as a work lamp is switched on (high currenty draw) or the BBQ bottle
runs low on pressure open up the throttle to avoid stalling before switching
the compressor back on.
I've got some of it worked including an algorithm to prevent "hunting" in
the motor. The only bit I can't wortk out is how to pick up a RPM signal
off the magneto. Anyone got any ideas? As far as I can tell, getting the
Stamp waiting for tacho signals will "pause" the program while it waits,
slowing down its response time to a stalling engine. Hmmm, maybe I could
use a freq2volt converter then read in the analog value - that'd be
quicker.... anyone got a better idea???
I figure the rest of it can't be that hard... Then again, the marshmallow
toaster seems like a way cooler project....
PS. For anyone else trying this, "dyi_efi" even has links to show you how
to run a fuel injector properly off a parallel port so running it off a
Stamp can't be that hard.
PSS sorry for rambling - it's late...
Regards,
Matt
I've been a bit slack reading this group lately but I've been thinking about
making a BS1 ECU for my lawnmower for a few months now and now you've got me
thinking about it again....
How's this for a dumb idea...
I need a portable 12v power and compressor setup for use in the forest for
servicing my rally car....
A motor mower engine will be hooked up to an old car alternator and an air
conditioning compressor. The compressor is hooked up to a BBQ gas bottle
giving me a supply of compressed air to run a "rattle gun". The alternator
will run the work lights.
The Stamp is used to run the engine as follows:
Use PWM to drive an old remote contol cars servo motor to open and close the
throttle.
Keep the existing magneto ignition for simplicity.
The stamp also fires the injector (not timed to the engine rpm) -
carburettors aren't!
Monitor engine rpm and increase/decrease fuel as appropriate to keep engine
running at the correct rpm (idle).
As soon as a work lamp is switched on (high currenty draw) or the BBQ bottle
runs low on pressure open up the throttle to avoid stalling before switching
the compressor back on.
I've got some of it worked including an algorithm to prevent "hunting" in
the motor. The only bit I can't wortk out is how to pick up a RPM signal
off the magneto. Anyone got any ideas? As far as I can tell, getting the
Stamp waiting for tacho signals will "pause" the program while it waits,
slowing down its response time to a stalling engine. Hmmm, maybe I could
use a freq2volt converter then read in the analog value - that'd be
quicker.... anyone got a better idea???
I figure the rest of it can't be that hard... Then again, the marshmallow
toaster seems like a way cooler project....
PS. For anyone else trying this, "dyi_efi" even has links to show you how
to run a fuel injector properly off a parallel port so running it off a
Stamp can't be that hard.
PSS sorry for rambling - it's late...
Regards,
Matt
Comments
and 12 volt trouble lights
(use voltage divider to get ignition signal off of coil primary - condition
as necessary)
good luck on your open loop injector control
you might get by with out an o2 sensor but Ill bet you will need to know
engine load (intake vacuum)
richard
Original Message
From: "Matt Swan @ home" <matt_swan@b...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, November 19, 2001 7:15 AM
Subject: [noparse][[/noparse]basicstamps] Re:ECU projects
> Hi guys,
>
> I've been a bit slack reading this group lately but I've been thinking
about
> making a BS1 ECU for my lawnmower for a few months now and now you've got
me
> thinking about it again....
> How's this for a dumb idea...
> I need a portable 12v power and compressor setup for use in the forest for
> servicing my rally car....
> A motor mower engine will be hooked up to an old car alternator and an air
> conditioning compressor. The compressor is hooked up to a BBQ gas bottle
> giving me a supply of compressed air to run a "rattle gun". The
alternator
> will run the work lights.
> The Stamp is used to run the engine as follows:
> Use PWM to drive an old remote contol cars servo motor to open and close
the
> throttle.
> Keep the existing magneto ignition for simplicity.
> The stamp also fires the injector (not timed to the engine rpm) -
> carburettors aren't!
> Monitor engine rpm and increase/decrease fuel as appropriate to keep
engine
> running at the correct rpm (idle).
> As soon as a work lamp is switched on (high currenty draw) or the BBQ
bottle
> runs low on pressure open up the throttle to avoid stalling before
switching
> the compressor back on.
>
> I've got some of it worked including an algorithm to prevent "hunting" in
> the motor. The only bit I can't wortk out is how to pick up a RPM signal
> off the magneto. Anyone got any ideas? As far as I can tell, getting the
> Stamp waiting for tacho signals will "pause" the program while it waits,
> slowing down its response time to a stalling engine. Hmmm, maybe I could
> use a freq2volt converter then read in the analog value - that'd be
> quicker.... anyone got a better idea???
>
> I figure the rest of it can't be that hard... Then again, the marshmallow
> toaster seems like a way cooler project....
>
> PS. For anyone else trying this, "dyi_efi" even has links to show you how
> to run a fuel injector properly off a parallel port so running it off a
> Stamp can't be that hard.
>
> PSS sorry for rambling - it's late...
>
> Regards,
>
> Matt
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Body of the message will be ignored.
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>
>
Known as "Speed Density".
It works like this, each time the ignition fires (or every 4th time for some
V8's)
The injector(s) are pulsed, the duration of the pulse depends almost
entirely on the density of the air in the intake.
If the intake is near full vacuum this means the engine is only taking in a
small quantity of air,
so the pulse is short, but if the intake is near atmospheric pressure,
this means the engine is taking in as much air as it can and so needs a
longer pulse of fuel.
Original Message
From: "Matt Swan @ home"
To: <basicstamps@yahoogroups.com>
Sent: Monday, November 19, 2001 7:15 AM
Subject: [noparse][[/noparse]basicstamps] Re:ECU projects
> Hi guys,
>
> I've been a bit slack reading this group lately but I've been thinking
about
> making a BS1 ECU for my lawnmower for a few months now and now you've got
me
> thinking about it again....
> How's this for a dumb idea...
> I need a portable 12v power and compressor setup for use in the forest for
> servicing my rally car....
> A motor mower engine will be hooked up to an old car alternator and an air
> conditioning compressor. The compressor is hooked up to a BBQ gas bottle
> giving me a supply of compressed air to run a "rattle gun". The
alternator
> will run the work lights.
> The Stamp is used to run the engine as follows:
> Use PWM to drive an old remote contol cars servo motor to open and close
the
> throttle.
> Keep the existing magneto ignition for simplicity.
> The stamp also fires the injector (not timed to the engine rpm) -
> carburettors aren't!
> Monitor engine rpm and increase/decrease fuel as appropriate to keep
engine
> running at the correct rpm (idle).
> As soon as a work lamp is switched on (high currenty draw) or the BBQ
bottle
> runs low on pressure open up the throttle to avoid stalling before
switching
> the compressor back on.
>
> I've got some of it worked including an algorithm to prevent "hunting" in
> the motor. The only bit I can't wortk out is how to pick up a RPM signal
> off the magneto. Anyone got any ideas? As far as I can tell, getting the
> Stamp waiting for tacho signals will "pause" the program while it waits,
> slowing down its response time to a stalling engine. Hmmm, maybe I could
> use a freq2volt converter then read in the analog value - that'd be
> quicker.... anyone got a better idea???
>
> I figure the rest of it can't be that hard... Then again, the marshmallow
> toaster seems like a way cooler project....
>
> PS. For anyone else trying this, "dyi_efi" even has links to show you how
> to run a fuel injector properly off a parallel port so running it off a
> Stamp can't be that hard.
>
> PSS sorry for rambling - it's late...
>
> Regards,
>
> Matt
Original Message
From: "Matt Swan @ home" <matt_swan@b...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, November 19, 2001 5:15 AM
Subject: [noparse][[/noparse]basicstamps] Re:ECU projects
> Hi guys,
>
> I've been a bit slack reading this group lately but I've been thinking
about
> making a BS1 ECU for my lawnmower for a few months now and now you've got
me
> thinking about it again....
> How's this for a dumb idea...
> I need a portable 12v power and compressor setup for use in the forest for
> servicing my rally car....
> A motor mower engine will be hooked up to an old car alternator and an air
> conditioning compressor. The compressor is hooked up to a BBQ gas bottle
> giving me a supply of compressed air to run a "rattle gun". The
alternator
> will run the work lights.
> The Stamp is used to run the engine as follows:
> Use PWM to drive an old remote contol cars servo motor to open and close
the
> throttle.
> Keep the existing magneto ignition for simplicity.
> The stamp also fires the injector (not timed to the engine rpm) -
> carburettors aren't!
> Monitor engine rpm and increase/decrease fuel as appropriate to keep
engine
> running at the correct rpm (idle).
> As soon as a work lamp is switched on (high currenty draw) or the BBQ
bottle
> runs low on pressure open up the throttle to avoid stalling before
switching
> the compressor back on.
>
> I've got some of it worked including an algorithm to prevent "hunting" in
> the motor. The only bit I can't wortk out is how to pick up a RPM signal
> off the magneto. Anyone got any ideas? As far as I can tell, getting the
> Stamp waiting for tacho signals will "pause" the program while it waits,
> slowing down its response time to a stalling engine. Hmmm, maybe I could
> use a freq2volt converter then read in the analog value - that'd be
> quicker.... anyone got a better idea???
>
> I figure the rest of it can't be that hard... Then again, the marshmallow
> toaster seems like a way cooler project....
>
> PS. For anyone else trying this, "dyi_efi" even has links to show you how
> to run a fuel injector properly off a parallel port so running it off a
> Stamp can't be that hard.
>
> PSS sorry for rambling - it's late...
>
> Regards,
>
> Matt
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. 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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