Please ignore my earlier (snide) comments about s/w vs h/w reliability. This is an important topic that will probably become a recurring theme. Someone needs to give a seminar at a PSES symposium for testing microprocessor-controlled systems. And I am not talking about another standards conformity recipe class. It causes me great pain to say this, but we should probably look for an academic with applied experience to present this subject.
We, as a community of safety and EMC professionals, should be concerned that that I continue to surprise and amaze safety agency/NCB assessment engineers with my test technique for a box with an embedded micro-controller. Perhaps the nature of the 'Toyota' discussion should have been the effect of hardware faults on a firmware-controlled system vs white box vs black box tests. Brian From: [email protected] [mailto:[email protected]]On Behalf Of Waterloo EMC Services Sent: Saturday, February 27, 2010 11:27 AM To: '[email protected]' Subject: RE: [PSES] Toyota Group After reading this string, I tried putting my Camry Hybrid into neutral while accelerating with the result that the engine immediately dropped to idle and the car coasted freely. In this case the transmission (continuously Variable) is software controlled as is the throttle. John Mowbray Waterloo EMC Services 519 581 7170 email: [email protected] Web: www.waterlooemcservices.ca From: [email protected] [mailto:[email protected]] On Behalf Of Pettit, Ghery Sent: Thursday, February 18, 2010 11:06 AM To: [email protected]; Bob Richards Cc: [email protected] Subject: RE: [PSES] Toyota That's properly called a Dynaflush transmission. J I know, my first car was a 1954 Buick Special. J Ghery S. Pettit From: [email protected] [mailto:[email protected]] On Behalf Of Doug Smith Sent: Wednesday, February 17, 2010 9:18 PM To: Bob Richards Cc: [email protected] Subject: Re: [PSES] Toyota The early 50s Buicks had a Dynaflow transmission with infinite gear ratios (variable pitch turbines instead of gears). You could shift into reverse at any speed. The more you pressed on the gas, the quicker the car stopped and then started in the opposite direction (backwards). Doug On 2/17/10 5:42 PM, Bob Richards wrote: I shifted from neutral to reverse once, while going about 60mph forward. (Non-intentional, I must add). It actually went into reverse. The rear tires locked up, but I was able to quickly shift back to neutral and coasted to a stop on the side of the road. I expected to see transmission fluid leaking out, a bent drive shaft, etc. Nothing wrong. Cranked back up and continued on my way. This was in a Plymouth Arrow (I believe it was a Mitsubishi product), circa 1980. Bob R. --- On Wed, 2/17/10, McInturff, Gary <[email protected]> wrote: Oh transmission aren't all that invulnerable. I thought it was impossible to get a transmission into part while doing about 60. An old girlfriend proved me wrong about that - *(*#REN#Y$I&243()(@$)(@!! Anybody want some smooth gears and a pile of scrap metal Gary McInturff 208 635 8306 - 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]>
