Date:         Sat, 16 Nov 2013 12:14:20 -0500
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Arduino and Vanagons
Comments: To: Brett Ne <brettn777@GMAIL.COM>
In-Reply-To:  <CAPAEXFekOfg4KZxOm5xhiSrrCdfKYVDGxKNQA_yOfRrgOsbUNg@mail.gmail.com>
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Recently I installed a rebuilt Idle controller from GoWesty. I have to say
they got it right. It works just as it should. The price in my opinion was
reasonable for how well it is working. Time will tell if it lasts.
For the questions below see my comments.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Brett Ne
Sent: Friday, November 15, 2013 11:03 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Arduino and Vanagons

GoWesty emailed back and declined to share their information, citing "that
data is proprietary".  It really isn't, just as knowing the expected output
voltage range of a healthy voltage regulator isn't proprietary.  Oh, well,
it was worth a try...it just means a little more work on our part.


So, here's what we need to know:
* The PWM duty cycle being feed to the idle air valve when:
     --the engine is cold, the starter is engaged, and the coil is shorted
I don't think that coil should ever get shorted. There has to be a map for
cold start. There has to consideration for even warm or hot start all the
way down to -40F.
     --the engine is cold & running
Maintain 1,000 rpm up to one minute if coolant under 100F.
     --the engine is fully warm & running
Purely feed back controlled 850 rpm.
     --the engine is fully warm & running with PS operating
Add no more than 100-150 rpm
     --the engine is fully warm & running with AC on
Same as Power steering critical for automatics.
     --the engine is fully warm & running with PS operating and AC on
Back when we had emissions test for pre 96 vehicles any idle over 1,100 rpm
was a failure.
*  The current draw from the idle air valve at a known duty cycle.(or feed
it straight 12v and measure the current draw.)
12 volts on that valve for any length of time will smoke it.
* The base voltage and the peak voltage coming from the Hall sensor The
above items will need to be done by someone with a scope and a healthy ICU &
idle air valve(and PS & AC).

*  Which connector, 4/ST2 or 11/ST1, supplies the PWM power to the idle air
valve. (and confirm that whichever supplies the PWM power, that the other is
a ground connection.)
*  What is the voltage at the coolant temperature sensor when cold and when
160 F.
Why 160F? The engine goes closed loop around 110-120F.

Hope this helps.

I think that this would provide all the information needed to design the
circuitry and program the microcontroller to drive the idle air valve.



And once a prototype is built, we will need a vict-- I mean volunteer-- to
connect it to their rig for testing & fine tuning.  Preferably in the
Portland, OR area.


--
Brett in Portland, OR
"Albert" '82 VanFox I4 Riviera