[T2] electronic thermostat

[C. Dreike]

I would spring load the flaps open and use the servo to close them 
upon power up, then open gradually as the engine warms up.

Chris

Scientists seek to understand what is,
while engineers seek to create what never was.
As the "Bad Astronomer" Phil Plait says, "Teach a man to reason, and 
he can think for a lifetime."
----- Original Message ----- 
From: <accessys at smart.net>
To: "Joe St Croix" <spotop at gmail.com>
Cc: "Type 2 List" <type2 at type2.com>
Sent: Friday, April 18, 2014 8:27 AM
Subject: Re: [T2] electronic thermostat




and any failure mode should be FULL open the same as VW did.

Bob

On Fri, 18 Apr 2014, Joe St Croix wrote:

> Date: Fri, 18 Apr 2014 10:59:04 -0400
> From: Joe St Croix <spotop at gmail.com>
> To: Christophe Guilbert <cguilbert at picasso.ucsf.edu>,
>     Type 2 List <type2 at type2.com>
> Subject: Re: [T2] electronic thermostat
>
> An over ride switch.
> If there will be an lcd display showing the temp, the ability to 
> push a
> button to open or close the flaps as needed in case of an emergency.
>
> -----Original Message----- From: Christophe Guilbert
> Sent: Thursday, April 17, 2014 10:43 PM
> To: Type 2 List
> Subject: [T2] electronic thermostat
>
> Hi guys , a while ago , I announced that I will do an electronic
> thermostat.
> I did a prototype using an Arduino nano , a servo motor and a 
> digital
> temp sensor which control the servo.
> The electronic and servo are located in the engine compartment. 
> Servo
> and arduino are voltage regulated against voltage fluctuations. The
> flaps are moved  by the servo motor using a regular bicycle cable 
> which
> goes through the bracket which was holding the mechanical thermostat 
> .
> So far it looks really good, I will post everything once this 
> project is
> complete (soon) with details and video.
>
> Meanwhile I would like some ideas/feedback about the way I should 
> open
> the flaps according to the temperature.
>
> I have mainly 2 problems.
> 1) Where to put my temp sensor.
> 2) Flap opening(%) curve according to the temperature (which is
> Dependant to 1)
>
> So far , I wanted to install my (waterproof) temp sensor to the 
> bracket
> holding (the now missing ) mechanical thermostat , however the 
> optimal
> reading to open the flag of my sensor will be different than the one
> provide by the mechanical thermostat. why  ? well correct me if I am
> wrong but I suspect that since air is a great thermal insulator, 
> most of
> the heat received by the mechanical thermostat will come trough  its
> metal mounting bracket which is attached to the engine. I probably 
> will
> have to take care of that while programing point 2)
>
> Now , I also have this other idea. Instead of using the thermostat
> bracket to hold my temp sensor , I can install an (none contact)
> infrared temperature sensor just on the top  of cylinder III (by
> drilling a small hole trough the tin to accommodate the sensor) and 
> use
> that temperature to control the flap. In this event what, should be
> point 2) ???. I like this idea because I the control of the flap 
> will be
> the reflection of areal  cylinder temperature. I can also attach an 
> LCD
> display to my Arduino to monitor real time the temperature and even 
> put
> an alarm using a buzzer in case the flaps stay open too long , I 
> also
> wont need any thermocouple temp sensor attached to the spark-plug 
> anymore.
>
> Also , arduino has an endless possibilities , I would like to use it 
> as
> a mini computer for my bus later on .
> I plan to check the voltage , RPM, oil temp , cyl temp, etc ....
>
> If you guys dream to add something to my project , what would it be?
>
> Thanks for any discussion.
>
> Chris
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