It might be wise to design a circuit which over-rides the accelerator whenever the brake pedal is depressed. That over-ride circuit could be made fault tolerant through redundancy, but at some level of disturbance no electronic circuit is likely to be fault-tolerant.
Mechanically linked throttles were also known to stick, sometimes due to weather. I wonder if the failure rates of those are comparable to the electronic versions. _______________________________________ _____________________________________________ Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | From: John Woodgate <j...@jmwa.demon.co.uk> To: EMC-PSTC@LISTSERV.IEEE.ORG List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: 02/06/2010 02:55 AM Subject: Re: [PSES] Agency Probes Gas Pedals' Link to EMI ________________________________ In message <c7927e83.658c2%ken.ja...@emccompliance.com>, dated Sat, 6 Feb 2010, Ken Javor <ken.ja...@emccompliance.com> writes: >But that's like saying, yes it is possible that it will rain in Death >Valley, when inquiring if damage to a domicile might have been caused >by a hurricane. I was pointing out that the question demanded such a response and was therefore not the right question. > >The real question, given present automotive EMI standards, is "What is >the probability that a real world threat exceeded the stress levels >imposed during radiated susceptibility qualification (which runs 100 >V/m or higher to my knowledge)?" Yes, that's close enough to the right question. I'm not familiar with the European requirements, which are embodied in the Automotive Directive, not in standards. But I understand that they are very stringent. A few significant problems were experienced prior to the Directive, some involving rural roads exposed to very high RF field strengths from nearby broadcast transmitters. Nevertheless, no amount of testing, however stringent and well-implemented, can foresee all possibilities, because the micro-environment in the vehicle can be affected by the owner. For example, a metal box without a lid might act as a resonant cavity and produce a local highly-intensified field strength close to an electronics box hidden behind a side panel of the vehicle interior. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK I should be disillusioned, but it's not worth the effort. - 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc <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/ <http://www.ieee-pses.org/> Instructions: http://listserv.ieee.org/request/user-guide.html <http://listserv.ieee.org/request/user-guide.html> List rules: http://www.ieee-pses.org/listrules.html <http://www.ieee-pses.org/listrules.html> For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> ________________________________________________________________________ This email has been scanned for SPAM content and Viruses by the MessageL abs Email Security System. ________________________________________________________________________ - 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 <emc-p...@ieee.org> 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
