Wierd application, hypothetical question.

[justin ivan]

Mark,
I'm an ME too so I share your pain. As far as this idea, it is totally 
possible, i used to work with a solenoid valve company that had these type 
of coils. Of course the testing that I witnessed was all controlled by a pc 
but I don't see why some pots on a breadboard wouldn't work. Not being an EE 
nor into diesels, I have to ask, why not use a pure mechanical system that 
uses the positive intake pressure to displace a piston and thus move the 
cam? Something similar to a rising rate Fuel pressure regulator on a gas 
turbo car?
Justin

>From: "Shirley, Mark R" <MarkRShirley at eaton.com>
>Reply-To: diy_efi at diy-efi.org
>To: "'diy_efi at diy-efi.org'" <diy_efi at diy-efi.org>
>Subject: Wierd application, hypothetical question.
>Date: Tue, 5 Dec 2000 09:59:59 -0500
>
>Hope you guys can help.  This is gonna sound wierd, but here goes.
>
>I have a small 4cylinder diesel engine (not VW) that I am going to
>turbocharge.
>The engine was never available turbocharged, so there's no way to use the
>stock
>fuel pump for boost enrichment.  As anybody who's familiar with diesels
>knows,
>there's a fuel screw on the side of the pump that pushes on a cam inside 
>the
>pump for enrichment.
>I wanted to try and use a coil and plunger arrangment to push on this cam,
>only when
>under boost.  So what I am thinking is a 12V, PWM output based on a
>MAP/boost sensor
>input, and maybe Air temp.  How simple would such a circuit be?  I am not 
>an
>EE, but a ME, with a little EE experience.  Programming is not a problem.
>Designing circuits, that's a
>different story.
>
>So MAP / IAT  --->  processor or circuit  ---->  single PWM output (could 
>be
>high amperage,)
>
>(depends on the force
>
>(needed to overcome pump
>
>(internal spring press.)
>
>If there was an easy way to do such a system, would it be easily tunable?
>Pots on a breadboard, or laptop?  A lookup table seemed the simplest to 
>tune
>to me, but perhaps
>not to build.
>
>Any help is appreciated.
>Thanks!
>Mark
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