A good digital oscilloscope?
in [Design]
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From: Martin Brown on 17 Dec 2009 04:54 Joerg wrote: > Martin Brown wrote: >> Joerg wrote: >>> Jim Thompson wrote: >> >>>> Ummmmm? My Q45 has automatic _stability_ control. >>>> >>>> Keep it up Joerg, you're getting ALMOST as good at obfuscation as Ms >>>> Prissy ;-) >>>> >>> >>> Automatic stuff can improve the performance, of course. But only to >>> some extent, just like ABS is no miracle cure. Shortly after I had my >>> Mits (has largish truck brakes) someone in front of me on Hwy 50 >>> screwed up. I hit the brakes hard but not to the lock-up points, just >>> a smidgen before. Looked in rearview, oh s..t, big black BMW coming >>> closer. I stop, then big black BMW leaves highway and skids along the >>> grass on the median. I walked out there to see if he was ok. "Man, >>> how come your Mits has a better ABS than my BMW?" ... "Ahm, well, my >>> Mits doesn't have any ABS." >> >> If they were more or less equal weight vehicles then it would have to >> be down to user error (unless the prat was too close to begin with). >> >> BMWs ABS if used correctly will stop the vehicle very fast and at >> close to the best an experienced driver could manage. It isn't a good >> idea to stamp on the brakes like that unless you *really* need to stop >> very quickly. The guy behind might not have the same braking capacity. > > He didn't quite keep the two-second distance (he should have ...) but > was not tail-gating me. It was an experienced driver, the older sales > guy type who spools off 50k miles or more a year. He said he practically > stood on the brake and yet my rear bumper came closer and closer. Sorry but whilst I do believe your description of what you did I reckon the aging road warrior was dozing at the wheel and was at least a second too late in applying his brakes. BMW ABS is nothing like that bad even on their ugly 4x4s. His vehicle might have been heavily overloaded I suppose but user error is still by far the most likely explanation. >> The only time I ever had to do it at high speed everything loose in >> the car ended up airborne and then at the bottom of the footwell. >> >> It will stop pretty well if you don't trigger ABS too, but it is too >> common for drivers to be startled by ABS feedback on the brake pedal, >> lift their foot pressure and then wonder why they are not slowing down. >> >> It isn't a good idea to be testing your ABS for the first time in an >> actual emergency - though that is what a lot of people do! >> > > Worse, some folks think they can drive more aggressively now that they > have ABS. Tell me about it. I have driven in Belgium for a few years and there with the random mix of priorite a droite junctions and normal ones you really need your wits about you. Especially near blind p-a-d junctions favoured by insurance fraudsters. They all drive relying on ABS. To explain for Americans some Belgian roads give priority to *all* right turning traffic provided that it does not slow down on making the turn! As you can imagine this causes an incredible number of accidents where a car comes out and one travelling on the main road ploughs into the drivers side door. Belgian drivers are very brave. I view triggering ABS as an indication of failure to anticipate developing traffic situations ahead. Regards, Martin Brown
From: Joerg on 17 Dec 2009 16:12 Martin Brown wrote: > Joerg wrote: >> Martin Brown wrote: >>> Joerg wrote: >>>> Jim Thompson wrote: >>> >>>>> Ummmmm? My Q45 has automatic _stability_ control. >>>>> >>>>> Keep it up Joerg, you're getting ALMOST as good at obfuscation as Ms >>>>> Prissy ;-) >>>>> >>>> >>>> Automatic stuff can improve the performance, of course. But only to >>>> some extent, just like ABS is no miracle cure. Shortly after I had >>>> my Mits (has largish truck brakes) someone in front of me on Hwy 50 >>>> screwed up. I hit the brakes hard but not to the lock-up points, >>>> just a smidgen before. Looked in rearview, oh s..t, big black BMW >>>> coming closer. I stop, then big black BMW leaves highway and skids >>>> along the grass on the median. I walked out there to see if he was >>>> ok. "Man, how come your Mits has a better ABS than my BMW?" ... >>>> "Ahm, well, my Mits doesn't have any ABS." >>> >>> If they were more or less equal weight vehicles then it would have to >>> be down to user error (unless the prat was too close to begin with). >>> >>> BMWs ABS if used correctly will stop the vehicle very fast and at >>> close to the best an experienced driver could manage. It isn't a good >>> idea to stamp on the brakes like that unless you *really* need to >>> stop very quickly. The guy behind might not have the same braking >>> capacity. >> >> He didn't quite keep the two-second distance (he should have ...) but >> was not tail-gating me. It was an experienced driver, the older sales >> guy type who spools off 50k miles or more a year. He said he >> practically stood on the brake and yet my rear bumper came closer and >> closer. > > Sorry but whilst I do believe your description of what you did I reckon > the aging road warrior was dozing at the wheel and was at least a second > too late in applying his brakes. BMW ABS is nothing like that bad even > on their ugly 4x4s. His vehicle might have been heavily overloaded I > suppose but user error is still by far the most likely explanation. > I saw his panicked face, he really was gradually coming closer. Gradually, so the brakes must have been applied. He was alone in the car and AFAIR his only baggage was a briefcase and a laptop (which had crunched itself into the passenger side firewall). >>> The only time I ever had to do it at high speed everything loose in >>> the car ended up airborne and then at the bottom of the footwell. >>> >>> It will stop pretty well if you don't trigger ABS too, but it is too >>> common for drivers to be startled by ABS feedback on the brake pedal, >>> lift their foot pressure and then wonder why they are not slowing down. >>> >>> It isn't a good idea to be testing your ABS for the first time in an >>> actual emergency - though that is what a lot of people do! >>> >> >> Worse, some folks think they can drive more aggressively now that they >> have ABS. > > Tell me about it. I have driven in Belgium for a few years and there > with the random mix of priorite a droite junctions and normal ones you > really need your wits about you. Especially near blind p-a-d junctions > favoured by insurance fraudsters. They all drive relying on ABS. To > explain for Americans some Belgian roads give priority to *all* right > turning traffic provided that it does not slow down on making the turn! > As you can imagine this causes an incredible number of accidents where a > car comes out and one travelling on the main road ploughs into the > drivers side door. Belgian drivers are very brave. > Try Italy :-) Priorite a klaxon. He who has loudest horn wins. > I view triggering ABS as an indication of failure to anticipate > developing traffic situations ahead. > Yes, except when a kid jumps into the road. But even that can often be avoided. One boy that must now be about 15 got spared injury because I never go above 15mph in our 25mph road here. I stopped about 2ft from him when he was 3 or 4 and literally dashed into the road. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Baron on 17 Dec 2009 16:51 Joerg Inscribed thus: >>> Worse, some folks think they can drive more aggressively now that >>> they have ABS. >> >> Tell me about it. I have driven in Belgium for a few years and there >> with the random mix of priorite a droite junctions and normal ones >> you really need your wits about you. Especially near blind p-a-d >> junctions favoured by insurance fraudsters. They all drive relying on >> ABS. To explain for Americans some Belgian roads give priority to >> *all* right turning traffic provided that it does not slow down on >> making the turn! As you can imagine this causes an incredible number >> of accidents where a car comes out and one travelling on the main >> road ploughs into the drivers side door. Belgian drivers are very >> brave. >> > > Try Italy :-) > > Priorite a klaxon. He who has loudest horn wins. > > >> I view triggering ABS as an indication of failure to anticipate >> developing traffic situations ahead. >> > > Yes, except when a kid jumps into the road. But even that can often be > avoided. One boy that must now be about 15 got spared injury because I > never go above 15mph in our 25mph road here. I stopped about 2ft from > him when he was 3 or 4 and literally dashed into the road. > I had a similar thing happen to me whilst I was doing my driving test, nearly 50 years ago. Kiddy ran out of a gate straight into the road chasing a football. I got my pink slip but never went on to complete the test. The examiner was more shaken than I was... No seatbelts in those days. -- Best Regards: Baron.
From: Joerg on 17 Dec 2009 17:02 Baron wrote: > Joerg Inscribed thus: > [...] >> >>> I view triggering ABS as an indication of failure to anticipate >>> developing traffic situations ahead. >>> >> Yes, except when a kid jumps into the road. But even that can often be >> avoided. One boy that must now be about 15 got spared injury because I >> never go above 15mph in our 25mph road here. I stopped about 2ft from >> him when he was 3 or 4 and literally dashed into the road. >> > > I had a similar thing happen to me whilst I was doing my driving test, > nearly 50 years ago. Kiddy ran out of a gate straight into the road > chasing a football. I got my pink slip but never went on to complete > the test. The examiner was more shaken than I was... No seatbelts in > those days. > When we moved to the US they wanted us to do a new driving test. My wife was quite nervous about it. I told here "Nah, piece a cake" and it was for me. Then it was her turn. Sure enough someone went into the road right in front of her. She reacted well but thought "That's it, I'll have to come back". But the DMV guy said "that was a good reaction". -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Baron on 17 Dec 2009 18:14
Joerg Inscribed thus: > Baron wrote: >> Joerg Inscribed thus: >> > [...] > >>> >>>> I view triggering ABS as an indication of failure to anticipate >>>> developing traffic situations ahead. >>>> >>> Yes, except when a kid jumps into the road. But even that can often >>> be avoided. One boy that must now be about 15 got spared injury >>> because I never go above 15mph in our 25mph road here. I stopped >>> about 2ft from him when he was 3 or 4 and literally dashed into the >>> road. >>> >> >> I had a similar thing happen to me whilst I was doing my driving >> test, >> nearly 50 years ago. Kiddy ran out of a gate straight into the road >> chasing a football. I got my pink slip but never went on to complete >> the test. The examiner was more shaken than I was... No seatbelts >> in those days. >> > > When we moved to the US they wanted us to do a new driving test. My > wife was quite nervous about it. I told here "Nah, piece a cake" and > it was for me. Then it was her turn. Sure enough someone went into the > road right in front of her. She reacted well but thought "That's it, > I'll have to come back". But the DMV guy said "that was a good > reaction". > Its a while since I was in the USA. First time was in New York. I was given the loan of a Ford truck, bloody big thing, only did about 12-14mpg. The guy who loaned it to me was quite concerned because it was a stick shift. He was quite surprised to learn that I had never driven an automatic and that in the UK you need a second test if you haven't passed one, using a vehicle with manual transmission. -- Best Regards: Baron. |