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Date:         Mon, 8 Jan 2007 09:37:12 -0800
Reply-To:     Pensioner <al_knoll@PACBELL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Pensioner <al_knoll@PACBELL.NET>
Subject:      Re: Idle Stabilizer Control Unit Reverse Engineering
In-Reply-To:  <200701080505.l0855Gef013637@flpi138.sbcis.sbc.com>
Content-Type: text/plain; charset="iso-8859-1"


Perhaps not so mysterious a design.  Your tachometer uses a pulse per unit
time to voltage conversion no digital stuff here nor D-A conversion.  So if
the transfer function of pulses per unit time  to voltage is known and the
desired range of ppt is known then the range of voltage is known.  A
comparator circuit can give you a measure of whether the voltage is within
the specified range.  If below then you have a signal that indicates engine
speed too low.  If above then engine speed too high.  Detailed design left
to David B or those with that sort of "bent".


Pensioner


Tau Beta Pi (bent), Eta Kappa Nu, Phi Kappa Phi in EE/CS,  O so long ago.
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