Ecm role expanding?

[jkooser at impsat.com]

Good thing the new Suburbans won't be falling out of the sky if their
fly-by-wire throttle craps out on them...

Jake Kooser
Field Engineer
Impsat USA
Tel: 1-954-779-7171, Ext. 3250
jkooser at impsat.com


> -----Original Message-----
> From: owner-gmecm at diy-efi.org 
> [mailto:owner-gmecm at diy-efi.org]On Behalf
> Of Marteney, Steven J.
> Sent: Wednesday, November 29, 2000 10:03 AM
> To: gmecm at diy-efi.org
> Subject: RE: Ecm role expanding?
> 
> 
> "X-by-wire has already been proven in aircraft and large
> industral/commerical
> vehicles.  Just because something is electronic doesn't mean 
> that it's less
> reliable than a mechanical system."
> 
> The aircraft argument always ruffles my feathers.  Yeah, so 
> what a few F-16s
> crashed from wire chaffing problems.  So what if a few F-16 
> pilots died as a
> result of poor engineering.  I'm sure the F-16 had quite a bit of
> "validation time" too.  I'm sure that's a real comfort to the 
> family's of
> those pilots.  I don't like the use of statistics and the 
> value of human
> life in the same argument.  It's not new, fully-tested 
> vehicles that will be
> the problem.  It will be the aging vehicles that us poor folk 
> have to drive
> around cause we can't afford a $500 / month car payment that 
> end up braking
> down.  The aircraft has a much more stringent and controllable service
> regiment as well.
> 
> Sorry, I'm ranting.  Just my take on it.
> Steve
> 
> -----Original Message-----
> From: Eric Bryant [mailto:BRYANTE at ghsp.com]
> Sent: Wednesday, November 29, 2000 9:48 AM
> To: 'gmecm at diy-efi.org'
> Subject: RE: Ecm role expanding?
> 
> 
> > From: ae2598 at wayne.edu [mailto:ae2598 at wayne.edu]
> > Subject: Re: Ecm role expanding?
> > 
> > 
> > It's gonna be the whole "sudden acceleration" scandal all 
> > over again.. 
> 
> "Sudden acceleration" was due to driver error - some people 
> just couldn't
> figure out that they were hitting the gas pedal, despite the 
> obvious clues
> (screaming engine sounds, sudden motion of vehicle).  There's 
> not too many
> vehicles that can actually overpower their brakes; the limp 
> 5-cylinder in an
> mid-80s Audi certainly can't.  As a result of this driver 
> error, you now
> have the BTSI systems in shifters that don't allow a shift 
> out of Park until
> you put your foot on the brake.  
> 
> I don't really see the same issue with ETC - sure, it might 
> get blamed for
> something, but I'm sure the system has seen enough validation 
> time where
> it's not going to be the cause of any accidents - that is, 
> until someone
> thinks that they can dick around with the code or sensor 
> adjustment to get
> better tip-in response or something.  I haven't seen any 
> schematics for the
> system, but I wouldn't be surprised to see it running something like a
> M-rola HC08 (maybe the AZ60, since it has Flash, CAN, and 
> J1850 features),
> with a second, less-powerful processor as a "watchdog" with 
> some minimal
> functionality in cause of failure of the main processor.  
> 
> X-by-wire has already been proven in aircraft and large 
> industral/commerical
> vehicles.  Just because something is electronic doesn't mean 
> that it's less
> reliable than a mechanical system.
> 
> Eric Bryant
> mailto:bryante at ghsp.com
> http://www.novagate.com/~bryante 
> 
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