In my Avalon as well as in Lexus, the ignition on-off is a push-button. Override "off" is to hold the button down for 3 seconds kinda like override off on your PC. I've had to do this on my PC, but I haven't tried it on the car yet. So, it would appear the ignition on-off is also a firmware system.
Yesterday, a woman testified before Congress that, under uncommanded acceleration, she shifted the car to neutral and reverse with minimal effect. Is the transmission firmware controlled? On the other hand, Airbus planes are firmware controlled. At least three layers of redundancy. Which didn't help AF 447, an Airbus A330, when the computers were sent conflicting data. See: http://www.airsafe.com/plane-crash/air- rance-flight-447-airbus-a330-atlantic-ocean.htm Computers do lock up in the presence of conflicting data. On 2/24/2010 13:22, [email protected] wrote: > > An emergency over-ride could be a simple as turning off the ignition, > but I'd add that it is not always that simple when a failure catches the > operator by surprise while in highway traffic. > > I think that all safety-critical functions (like accelerator or braking) > should be single-fault tolerant, but may not always be easy to implement. > _____________________________________ _______________________________________________ > > * > Ralph McDiarmid* | * Schneider Electric ** | Renewable Energies > Business* | *CANADA* | > > > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
