Low temp thermostat

[Mike Rolica]

Thermostat in closed loop?????  Wow pretty fancy thermostat.  Must be
expensive.  Where can I find one of theses open/close loop Thermostats?


BTW HE HE HE hmmm
Mike Rolica
EXT. 260
 :-)


	-----Original Message-----
	From:	David C. Allen [SMTP:davida at primenet.com]
	Sent:	Wednesday, October 27, 1999 7:20 PM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Re: Low temp thermostat

	I thought that the object of game was to keep the thermostat in the
closed 
	loop mode. It should only be in open loop during initial warm-up.
The ECM 
	can try to change engine operation during upper engine temperature 
	excursions, but it can not change the outside temperature or the
fact that 
	you are stuck in traffic. In the Suburban 1227165 TPI project, I
plan to 
	change from a engine driven cooling fan to twin electric cooling
units 
	which I can control via the ECM. With air conditioning you
could/will add 
	heat to radiator because of the airflow path, the ECM knows head
pressure 
	and engine temp so it could short cycle the compressor, and add
additional 
	cooling to lower AC head pressure.

	So I think the selection of a thermostat operating temp and
strategies of 
	how to keep the thermostat in a closed loop operation is a very
important 
	part of the gm ECM discussion. I would like to hear more!

	David