A good digital oscilloscope?
in [Design]
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From: JosephKK on 18 Dec 2009 12:02 On Thu, 17 Dec 2009 16:56:49 -0800, Joerg <invalid(a)invalid.invalid> wrote: >JosephKK wrote: >> On Tue, 15 Dec 2009 10:52:38 -0800, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: >> >>> "Joerg" <invalid(a)invalid.invalid> wrote in message >>> news:7opq9mF3qhhh3U1(a)mid.individual.net... >>>> We still learned how to hobble a stalled car off railroad tracks by using >>>> starter, clutch and first gear. Of course now they have switches on the >>>> clutch that don't let the starter engage unless fully depressed which >>>> defeats that extra safety measure. >>> I would have to guess the the ratio of how often people damaged or ruined >>> their starter or gearbox from trying to start without the clutch all the way >>> in to how often someone ended up with a stalled car on railroad tracks is >>> perhaps about a million to one? :-) >>> >>>> But they all have to keep sloshing around some of the oil around the shaft >>>> lock. There's a reason why even new automatic transmissions run hotter than >>>> gear boxes. And warmer = more losses. >>> Apparently what makes new automatics as efficient or even a little more so >>> than manuals is hitting the optimal shift points better than your average >>> human does. >>> >>> I keep hoping that one of these days an inexpensive and reliable continuously >>> variable transmission finds its way into cars. >>> >>> ---Joel >> >> Yep. I even remember hearing about the study where they took and measured when >> and where top professional drivers shifted under various situations. All kinds >> of pros, not merely racers. The study was done in the mid 1990s. It proved to >> be a real eye opener. It would not surprise me to find that most current production >> automatics have sufficiently sophisticated controls to recognize the current paradigm >> and respond with the optimal mapping for engine and shifting. > > >This would require the computer for the automatic transmission to have a >permanent and precise GPS feed, weather data feed, traffic congestion >feed and so on. Oh, and in Europe it would also have to see that old >Russky truck ahead that is abruptly pulling into lane 2 and that there >is a wee berm of frozen snow between lane 1 and lane 2 (had a close one >there once). Quit being silly. You had no such data feeds. Then again, humans have the best and most versatile vision system on the planet (as far as we know). But outdoor temperature, humidity, vehicle cabin controls (including things like wipers) can easily be brought to the computer. Just like the wheel motion sensors are. Plus, there are now really good MEMS acceleratometers, which can help detect sideways slip. As found in someone's sig: Engineering is the art of making what you want from what you have.
From: Jim Thompson on 18 Dec 2009 12:03 On Fri, 18 Dec 2009 12:00:33 -0500, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >JosephKK wrote: >> >> On Thu, 17 Dec 2009 03:01:47 -0500, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: >> >> > >> >JosephKK wrote: >> >> >> >> Then it should have been done both with and without cargo. >> > >> > >> > It was done with what we were expected to drive in Alaska at the cold >> >weather research facility. It was a place where they didn't plow the >> >snow. Instead, a road grader was used to turn loose snow into rough >> >pack ice. Most of the winter was below -20 so the only time you >> >encountered ice or water on ice was when some idiot was intentionally >> >spinning their tires, or there had been an accident and the vehicle had >> >melted some of the coarse ice. >> > >> > The flooded a parking lot the night before the test, then used a fire >> >hose to keep the ice wet for the test. >> >> Now that is just a mean test. > > > No, the mean part is when the instructor is talking to you and grabs >the steering wheel to cause a skid to see how you handle it. Right hands flies off steering wheel and smacks instructor across the chops. Then smoothly recover from skid unencumbered ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!
From: Vladimir Vassilevsky on 18 Dec 2009 12:13 JosephKK wrote: > As found in someone's sig: > Engineering is the art of making what you want from what you have. This is Jerry Avins, the elder of COMP.DSP. BTW, Jim Thompson is at least 10 years younger then Jerry :) VLV
From: Jim Thompson on 18 Dec 2009 12:33 On Fri, 18 Dec 2009 11:13:40 -0600, Vladimir Vassilevsky <nospam(a)nowhere.com> wrote: > > >JosephKK wrote: > > >> As found in someone's sig: >> Engineering is the art of making what you want from what you have. > >This is Jerry Avins, the elder of COMP.DSP. >BTW, Jim Thompson is at least 10 years younger then Jerry :) > >VLV Jerry is _80_ ?:-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!
From: Joerg on 18 Dec 2009 12:49
JosephKK wrote: > On Thu, 17 Dec 2009 16:56:49 -0800, Joerg <invalid(a)invalid.invalid> wrote: > >> JosephKK wrote: >>> On Tue, 15 Dec 2009 10:52:38 -0800, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: >>> >>>> "Joerg" <invalid(a)invalid.invalid> wrote in message >>>> news:7opq9mF3qhhh3U1(a)mid.individual.net... >>>>> We still learned how to hobble a stalled car off railroad tracks by using >>>>> starter, clutch and first gear. Of course now they have switches on the >>>>> clutch that don't let the starter engage unless fully depressed which >>>>> defeats that extra safety measure. >>>> I would have to guess the the ratio of how often people damaged or ruined >>>> their starter or gearbox from trying to start without the clutch all the way >>>> in to how often someone ended up with a stalled car on railroad tracks is >>>> perhaps about a million to one? :-) >>>> >>>>> But they all have to keep sloshing around some of the oil around the shaft >>>>> lock. There's a reason why even new automatic transmissions run hotter than >>>>> gear boxes. And warmer = more losses. >>>> Apparently what makes new automatics as efficient or even a little more so >>>> than manuals is hitting the optimal shift points better than your average >>>> human does. >>>> >>>> I keep hoping that one of these days an inexpensive and reliable continuously >>>> variable transmission finds its way into cars. >>>> >>>> ---Joel >>> Yep. I even remember hearing about the study where they took and measured when >>> and where top professional drivers shifted under various situations. All kinds >>> of pros, not merely racers. The study was done in the mid 1990s. It proved to >>> be a real eye opener. It would not surprise me to find that most current production >>> automatics have sufficiently sophisticated controls to recognize the current paradigm >>> and respond with the optimal mapping for engine and shifting. >> >> This would require the computer for the automatic transmission to have a >> permanent and precise GPS feed, weather data feed, traffic congestion >> feed and so on. Oh, and in Europe it would also have to see that old >> Russky truck ahead that is abruptly pulling into lane 2 and that there >> is a wee berm of frozen snow between lane 1 and lane 2 (had a close one >> there once). > > Quit being silly. You had no such data feeds. ... I sure did. I knew exactly where I was and that the terrain coming up was slightly uphill (meaning the Russky truck will already be at a crawl), I knew that it was windy and thus the ice would be hard, I knew the traffic around me and when I could pull into lane 1, and I saw a truck with Russian plates wavering and sure enough pull out right in front of me. Which I just knew was going to happen because I've seen many before doing that. Truckers from the east over there seem to not use the mirrors much, maybe because they aren't used to autobahns. An automatic transmission will know none of this and thus will likely deliver the muscle to go through the berm a smidgen too late. Since I saw the situation developing I already had it in 3rd and was driving cautiously avoiding load changes (it was rather slippery there). Then stepped on it when the truck pulled out, leaving some big furrows in the berm. I could hear the stuff scrape the bottom of the car but we were safely in the lane 1 tracks. Oh, and you really _don't_ want to throw an automatic from "D" into "2" in that situation. > ... Then again, humans have the best > and most versatile vision system on the planet (as far as we know). But outdoor > temperature, humidity, vehicle cabin controls (including things like wipers) can > easily be brought to the computer. Just like the wheel motion sensors are. Plus, > there are now really good MEMS acceleratometers, which can help detect sideways slip. > In that situation any ever so small sideways slip would have been the end of it because it was on a stretch where they had temporarily removed the middle guard rail. Meaning narrowed lanes and traffic in the other direction. > As found in someone's sig: > > Engineering is the art of making what you want from what you have. And hoping it doesn't kill anyone :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |