Fly By Wire
in [ATVs]
|
From: john on 3 Feb 2010 15:49 default on airplanes is full throttle cars "should" be closed throttle.... btw if you use an airplane motor on an air boat then loose the throttle cable things get exciting.... but that's another story being a reformed jaguar driver I learned to downshift a lot and plan on the xk120 brakes glowing & boiling fluid. "I am Tosk" <justwaitafrekinminute(a)gmail.com> wrote in message news:MPG.25d3a823cf1de1859896df(a)eternal-september.org... > In article <hkchjd$4n5$1(a)news.eternal-september.org>, s(a)yah.com says... >> >> If the dumbasses are using potentiometers, like we used to use for >> joysticks >> on computers, there is little doubt that cheaper POTS as they are called, >> soon send signal spikes not long after the first use. Nowdays the "good' >> computer joysticks (read that as flight controls or simulator wheels) use >> high quality Optical sensors (like computer mice did before using >> infrared >> light (the ones without balls in them) PLUS use a computer sampling >> circuit >> board to 'normalize" the output from that before it goes into the >> receiving >> device that is supposed to react to the signals. I don't doubt these >> sampling circuits could be under engineered for autos, heat or stress >> wise, >> low voltage overvoltage etc. >> >> In gaming, we use fly by wire. so figures they can do it in real life >> too. >> >> off throttle is probably 0 on throttle Full is probably anywhere from 25 >> to >> 1028 (or more I'm sure) steppings, the higher the more precise the pedal >> movement to throttle movement reaction would be. > > ... wondering if it would help to turn that around. Idle is 256 and full > throttle is ~0~... Kind of like air brakes, the default if the system > fails is to [stop]... > > RMR... >
From: Dean H on 3 Feb 2010 18:59 > > Go google the 911 call, the guy was doing a buck twenty according to him > and the brakes did not work. They all died a few seconds later > reading/screaming the signs into the phone, "freeway ends 1/4 mile, > etc...". I doubt when the guy said the brakes didn't work, he was making > it up. In this case, it was a Lexus. > > RMR That sounds much more like the Audi "unintended acceleration" fiasco of days gone by. What was it, the Audi 5000? Anyway, it was determined that in those Audi cases people were absolutely convinced that they were standing on the brake pedal, but they were standing on the gas. There was no mechanical problem at all and it was just lousy ergonomics combined with clueless drivers.
From: sturd on 3 Feb 2010 20:22 XR650L_Dave points out: > > > Did you hear the recently released 911 call from the father of a family > > > of 4 as their car hit the end of the freeway at 120 mph? > Mostly, but not completely true. > > My subaru, the brakes will fight the engine to a draw and get the car > down to 30 or 40 or so, but if I kept at it the brakes would overheat > and I'd lose 'em. http://www.caranddriver.com/features/09q4/how_to_deal_with_unintended_acceleration-tech_dept Strong foot, the instant you realize the throttle is WFO, is still my plan. Flicking the beast into neutral is a good idea too but I'm not convinced I want to take my hands off the bars while doing this manuever. As for the 911 call, yep, sounds like he overheated the brakes, then decided best bet was to call for help. His cop training I guess. Rereading that, it's pretty harsh. But man, the call is 48 seconds (that I found online), probably another 15 to dial and be connected, go through the possibilities. Brakes, blew that. Switch it off, forgot. Trans to neutral, forgot. Trans to anything, even reverse, forgot. Emergency brake, blew that. Find something soft to hit. Call the cops. He skipped a few steps. Go fast. Take chances. Mike S.
From: I am Tosk on 4 Feb 2010 06:11 In article <67ee46bb-11be-42c1-95bd-929b7b10dc17 @m16g2000yqc.googlegroups.com>, dfhyman(a)optonline.net says... > > > > > Go google the 911 call, the guy was doing a buck twenty according to him > > and the brakes did not work. They all died a few seconds later > > reading/screaming the signs into the phone, "freeway ends 1/4 mile, > > etc...". I doubt when the guy said the brakes didn't work, he was making > > it up. In this case, it was a Lexus. > > > > RMR > > That sounds much more like the Audi "unintended acceleration" fiasco > of days gone by. What was it, the Audi 5000? > Anyway, it was determined that in those Audi cases people were > absolutely convinced that they were standing on the brake pedal, but > they were standing on the gas. There was no mechanical problem at all > and it was just lousy ergonomics combined with clueless drivers. This was a Lexus... Scotty
From: Dean H on 4 Feb 2010 08:21
> I've already become accustomed to turning off the key when the ABS > betrays me and won't let me stop going downhill, the kind of > conditions where if you can lock up the brakes, the tires cut through > the snow/slush in a split second, but the ABS decides the right thing > to do is just coast off into the sunset- or a creek. > It's that characteristic of ABS that leads serious off-roaders to > disable it while off-road, after a few went down slippery slopes and > the ABS almost killed 'em. > > Dave That's what happened when I stuffed that V70 on new years day a few back. I had plenty of time to stop if I had been handling the modulation, but the ABS just threw in the towel and allowed the accident to happen. I hate lowest-common-denominator engineering. I guess that's the same as slob-enabled? |