Date: Sun, 25 Apr 2010 12:43:27 -0700
Reply-To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject: Re: PWM controller ,
was Water Cooler System Design Flaw Workaround?
In-Reply-To: <050f01cae4a5$4ef2c430$ecd84c90$@net>
Content-Type: text/plain; charset=ISO-8859-1
Maybe you guys could take your EE pissing contest off line?
The rest of us Van drivers want to argue about gear oils, tires and other
Vanagon related topics.
Thanks! =)
On Sun, Apr 25, 2010 at 11:29 AM, Tom Hargrave <thargrav@hiwaay.net> wrote:
> So, when are you going to stop talking smack and design one?
>
> For all digital I would use a PIC chip and not LabView because LabView is
> over kill. The package was designed for the test environment & runs on a
> PC,
> at least with the applications I've used it in.
>
> For all analog I would use a few timers and a simple counter. No pots or
> anything else to set once the design was done.
>
> Tom
> www.stir-plate.com
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
> Alistair Bell
> Sent: Sunday, April 25, 2010 12:54 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: PWM controller , was Water Cooler System Design Flaw
> Workaround?
>
> Sure Tom, those parameters are good and all, but is it really that much
> less
> complicated than an old school controller with pots for slope, offset etc?
>
> or, lets all go modern and run it off a custom made control strategy built
> in LabView, a laptop and a D->A interface.
>
> :)
>
> I really need to stop lazing around talking smack ,
>
> cheers
>
> ab
>
>
>
>
> On 25-Apr-10, at 10:46 AM, Tom Hargrave wrote:
>
> Yes, we are talking PID now and I can probably design something that would
> do the job. I suspect you could too since you brought up PID.
>
> But I wonder if the solution can be done a little less "high tech"
> and all
> 12V powered?
>
> For example, there are a set of known parameters for pulling a long
> hill:
>
> 1. You would want to know that the transmission was not in high gear.
> 2. You would want to know that the engine was above a certain RPM, let's
> say
> above 3500 RPM for arguments sake?
> 3. You would want to know that the engine was making power - throttle open
> &
> not coasting down a ling hill in lower gear to conserve breaks.
> 4. You would want to know that the vanagon met these two parameters for a
> specific period of time - maybe 15 seconds?
>
> Once these four tests were met you would switch on the fan or an auxiliary
> fan to pull all the heat you could from the radiator.
>
> Once test 1, 2 or 3 were no longer true for 15 seconds, you would switch
> the
> auxiliary control off. If this were a separate auxiliary fan it would turn
> off but if it were the main fan the fan would still be managed under the
> vanagon's system control.
>
> Tom
>
--
Jake
1984 Vanagon GL 1.9 WBX 'The Grey Van'
1986 Westy Weekender/2.5 SOHC Suby 'Dixie'
Crescent Beach, BC
www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27
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