Re: [xj-s] More Needless Complexity

[John Napoli <jgn@li.net>]

You're right, I love it.  Now, why not control it with vacuum-actuated
valves?  We might be able to build it with of-the-shelf parts.  Need a
fail-safe mode of operation, though, that doesn't cook the motor. 

John

On Thu, 23 Jul 1998, Kirbert wrote:

> Napoli will love this message.
> 
> I was thinking of other ways to clutter up the XJ-S with overly 
> complicated contraptions, and came up with a pretty good one.  How 
> about we replace the dual thermostats with an electronic engine 
> temperature control system?  Here's how it works:  Remove the 
> thermostat covers and design new covers that include a servo motor 
> that runs a worm screw in and out.  On the worm screw, mount the 
> parts from the original thermostats -- the disk that closes the 
> thermostat, and the disk that closes the bypass passage.  Then 
> install a temperature sending unit just on the engine side of the 
> thermostat housing (or use one of the senders already there) and 
> connect it to an ECU that controls the servo motor position.  When 
> the engine reaches set temp (180 deg F), the ECU starts moving the 
> servo motors in the open direction, opening the main passage and 
> closing off the bypass.
> 
> Coupla interesting features:
> 
> 1)  You could dial in whatever operating temperature you want.
> 
> 2)  With a little thought, you could provide P+I control, meaning 
> it would hold EXACTLY the set temp regardless of outdoor conditions.
> 
> 3)  You could program the ECU to anticipate thermal loads.  If you 
> stomp the gas pedal, it could go ahead and open the flow a little 
> rather than waiting for the engine to heat up.  It might likewise 
> react to the A/C compressor kicking on.
> 
> 4)  We could provide a little button on the dash that the driver 
> could hit about two miles before parking the car, that would tell the 
> ECU to prepare for shutdown -- and cool the car off BEFOREHAND.
> 
> Hey, once you have this thing up and running and have installed 
> electric radiator fans, maybe the whole system can be integrated into 
> a comprehensive engine temperature control system.
> 
>  -- Kirbert      |     If anything is to be accomplished,
>                  |     some rules must be broken.
>                  |          - Palm's Postulate
>

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References:

• [xj-s] More Needless Complexity
• From: "Kirbert" <palmk@mailer.gadcomm.net>

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