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Date:         Sun, 25 Apr 2010 12:47:17 -0500
Reply-To:     Tom Hargrave <thargrav@HIWAAY.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Tom Hargrave <thargrav@HIWAAY.NET>
Subject:      Re: PWM controller ,
              was Water Cooler System Design Flaw Workaround?
Comments: To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
In-Reply-To:  <x2n71d9cdf91004251024l1847eceak3ad3136c44a5273b@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"

Yep, that works fine as long as you remember to switch it on & back off.

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of Jake de Villiers Sent: Sunday, April 25, 2010 12:25 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: PWM controller , was Water Cooler System Design Flaw Workaround?

Like a manual switch controlled by the most amazing data processor of all, the human brain? ;)

On Sun, Apr 25, 2010 at 9:06 AM, Tom Hargrave <thargrav@hiwaay.net> wrote:

> I just found the schematic on line and they are already using engine > temperature to control the fan. I thought they would since VW is a > excellent company. > > This being the case, something may be worth designing that turned on > the fan earlier based on temperature change, like for example when > pulling a hill, to give the cooling system a jump start on cooling. > > Tom > www.towercooler.com > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On > Behalf Of Mike "Rocket J Squirrel" > Sent: Sunday, April 25, 2010 10:18 AM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: PWM controller , was Water Cooler System Design Flaw > Workaround? > > Alistair Bell wrote: > > my rad fan is 450 W if that helps > > > > alistair > > > > PS i dont see the point in a pwm controlled fan, I would concentrate > > in a more sophisticated temperature interpretation, ie a PID > > controller... monitor rate of temp change to that fan can keep on > > top of things... > > > > but you know, my experience of the fans in real life is that they > > come on, cool the van down and go off.... seem to work fine :) > > I'm with the Bell on this one. The radiator on the fan is capable of > creating lots of cool water, and the thermostat opens and closes as > needed to draw from that reservoir. If the engine was seeing huge over > and undershoots in temperature then a better control system would be warranted. > But the large thermal mass of the engine pretty much assures that temp > changes will occur pretty slowly, and the thermostat seems capable of > keeping up with them. > > I guess I don't see a problem that needs solving. But I do enjoy fancy > engineering for engineering's sake, too. > > > -- > Mike "Rocket J Squirrel" Elliott > 84 Westfalia: Mellow Yellow ("The Electrical Banana") > 74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.) > Bend, OR KG6RCR >

-- 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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