Consultants say interference in vehicle electronics is possible
in [Toyota]
|
From: TE Cheah on 25 Mar 2010 18:00 15 yr ago I read of 1 car in USA using auto cruise control drtve past a truck using CB radio, this car @ once got unintended acceleration, this driver switched off his auto cruise & ended this problem. He told medias to warn users of auto cruise control against CB radios.
From: clare on 25 Mar 2010 20:59 On Thu, 25 Mar 2010 17:28:15 -0500, dbu'' <nospam(a)nobama.com.invalid> wrote: >In article <4babdcf1$1_2(a)news.tm.net.my>, "TE Cheah" <4ws(a)gmail.com> >wrote: > >> 15 yr ago I read of 1 car in USA using auto cruise control drtve >> past a truck using CB radio, this car @ once got unintended >> acceleration, this driver switched off his auto cruise & ended this >> problem. He told medias to warn users of auto cruise control >> against CB radios. > >Maybe fifteen years ago, but EMI suppression has advanced since then in >the automotive industry and many other industries too. There was ONE model of cruise control I heard about that was extra-fussy about CB Radio interference and IIRC it was OK with a 4 watt unit installed in the vehicle, but a 100 watt Linear amp in a vehicle within a couple hundred feet could "jam" it. Those cruise control units were VERY primitive compared to anything on the market today. The affected unit was made by ARA if I remember correctly and the problem only occurred if using the engine speed sensor option instead of the magnets on the driveshaft - and that was closer to 20 or 25 years ago (very early 1980s - early Chevy Citation comes to mind.
From: Scott Dorsey on 25 Mar 2010 21:06 In article <4babdcf1$1_2(a)news.tm.net.my>, TE Cheah <4ws(a)gmail.com> wrote: >15 yr ago I read of 1 car in USA using auto cruise control drtve >past a truck using CB radio, this car @ once got unintended >acceleration, this driver switched off his auto cruise & ended this >problem. He told medias to warn users of auto cruise control >against CB radios. It's not just cruise control... there are a huge number of trucks out on the road that are violating the FCC emission regulations by three orders of magnitude. Consequently anything that isn't very carefully shielded with proper grounding design can have serious problems. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis."
From: Obveeus on 25 Mar 2010 21:51 "Scott Dorsey" <kludge(a)panix.com> wrote in message news:hoh1a5$jpd$1(a)panix2.panix.com... > In article <4babdcf1$1_2(a)news.tm.net.my>, TE Cheah <4ws(a)gmail.com> wrote: >>15 yr ago I read of 1 car in USA using auto cruise control drtve >>past a truck using CB radio, this car @ once got unintended >>acceleration, this driver switched off his auto cruise & ended this >>problem. He told medias to warn users of auto cruise control >>against CB radios. > > It's not just cruise control... there are a huge number of trucks out on > the road that are violating the FCC emission regulations by three orders > of magnitude. Consequently anything that isn't very carefully shielded > with proper grounding design can have serious problems. But if this was the real issue it would be much more easily detected and repeatable.
From: dr_jeff on 25 Mar 2010 21:52
clare(a)snyder.on.ca wrote: > On Thu, 25 Mar 2010 17:28:15 -0500, dbu'' <nospam(a)nobama.com.invalid> > wrote: > >> In article <4babdcf1$1_2(a)news.tm.net.my>, "TE Cheah" <4ws(a)gmail.com> >> wrote: >> >>> 15 yr ago I read of 1 car in USA using auto cruise control drtve >>> past a truck using CB radio, this car @ once got unintended >>> acceleration, this driver switched off his auto cruise & ended this >>> problem. He told medias to warn users of auto cruise control >>> against CB radios. >> Maybe fifteen years ago, but EMI suppression has advanced since then in >> the automotive industry and many other industries too. > There was ONE model of cruise control I heard about that was > extra-fussy about CB Radio interference and IIRC it was OK with a 4 > watt unit installed in the vehicle, but a 100 watt Linear amp in a > vehicle within a couple hundred feet could "jam" it. > > Those cruise control units were VERY primitive compared to anything on > the market today. The affected unit was made by ARA if I remember > correctly and the problem only occurred if using the engine speed > sensor option instead of the magnets on the driveshaft - and that was > closer to 20 or 25 years ago (very early 1980s - early Chevy Citation > comes to mind. Cruise control usually used vehicle speed rather than engine speed. If the car kicks in a lower gear (e.g., when going up hill), then the car would slow down to keep the engine speed constant. I am not saying that there weren't any cars that used engine speed rather than vehicle speed, but I would think that there are few. Jeff |