On Mar 3, 7:52*pm, wrote:
On Wed, 03 Mar 2010 18:50:48 -0600, AZ Nomad





wrote:
On Wed, 03 Mar 2010 17:07:12 -0500, wrote:
On Wed, 3 Mar 2010 13:16:13 -0800 (PST), wrote:

On Mar 3, 1:52*pm, AZ Nomad wrote:
however, there are multiple computers controlling the engine, and all it's
assocated subsystems, at least on mine, which is a 94. one would assume that
more modern cars have more computers to better control emissions, since the
current laws are much more strict than in 94.

nope.- Hide quoted text -

I'd like to see a credible reference that says there is more than one
computer controlling the engine on a 1994 car or even most of the cars
today. * The cars I've been familiar with have had one ECU, or engine
control unit and that is the one computer that manages the engine. *It
only makes sense, because whatever the emissions reqts are, you meet
them by correctly running the engine which means you need to measure
rpms, temp, airflow, emissions, speed, throttle, etc and all that
needs to be factored in to then determine the fuel delivery, timing,
etc. * It's would seem far easier and simpler to do that in one
computer that gets fed all the info.

There are potentially lots of other computers for climate control,
entertainment system, tranny, electronic displays, etc.

A lot also depends on what you want to count as a "computer".

A relay uses logic. Is it a computer?

How about a toggle switch?

moving the goalposts.

It looks like you're argueing for the sake of arguing.

An ECU is going to have a master program. *It doesn't matter if there
are ten trillion computers inside. *It is trivial for the master computer
to issue the order to shut the fuel off. *It is done every time the
car is shut off. *This isn't a terrible complex concept.

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