A good digital oscilloscope?
in [Design]
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From: JosephKK on 16 Dec 2009 23:09 On Tue, 15 Dec 2009 20:12:16 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >On a sunny day (Tue, 15 Dec 2009 11:25:08 -0800) it happened "Joel Koltner" ><zapwireDASHgroups(a)yahoo.com> wrote in ><qoRVm.421412$ua.8354(a)en-nntp-05.dc1.easynews.com>: > >>"Joerg" <invalid(a)invalid.invalid> wrote in message >>news:7oq5d3F3rbu8hU3(a)mid.individual.net... >>>So, got a link? >> >>The Toyota Corolla gets 26/35MPG (city/highway) with a manual and 27/35 with >>an automatic. The Nissan Sentra is more impressive at 24/31 (manual) and >>25/33 (auto CVT). >> >>From here: http://cars.about.com/od/helpforcarbuyers/tp/top10_fuel.htm. In >>most cases the manuals do slightly better, but clearly there are a few >>automatics out there that do as well or a tiny bit better than manuals. I >>have nothing against manuals and arguably then can be a little more fun to >>drive, but it seems like the fuel economy difference is largely a wash these >>days... and it's certainly a lot easier to find automatics if you're looking >>for used cars. > >Manual should be outlawed. No, people who did not learn on manual should be outlawed.
From: JosephKK on 16 Dec 2009 23:58 On Tue, 15 Dec 2009 09:11:42 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Tue, 15 Dec 2009 08:02:56 -0800, Joerg <invalid(a)invalid.invalid> >wrote: > >>Jim Thompson wrote: >>> On Tue, 15 Dec 2009 07:52:54 -0600, Jim Yanik <jyanik(a)abuse.gov> >>> wrote: >>> >>>> "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote in >>>> news:H3DVm.414201$ua.294023(a)en-nntp-05.dc1.easynews.com: >>>> >>>> >>>>> Hey, don't cars with automatics generally get a mile or two per gallon >>>>> better mileage than manuals? ;-) >>>>> >>>>> ---Joel >>>>> >>>>> >>>> Manuals usually get better mileage,but that is changing in -some- >>>> models,because of the addition of lockup torque converters and CVTs. >>>> >>>> automatics eliminate the need for driver competence. >>>> >>>> Note that "unintended accelleration" crashes occur only with automatics. >>> >> >>They should start teaching the basics again in drivers ed. Like how a >>car works. In Germany you used to not be able to get a license unless >>you could explain how an engine worked, and how other stuff such as >>clutch, gear box or differential worked. >> >>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. >> >> >>> You're living in the past... I can't recall any car using a purely >>> "slush" type torque converter for at least 30 years, maybe longer. >>> >> >>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. > >My Audi is weird: it's a 6-speed automatic, but it has no torque >converter. It has two gear trains, one for odd gears and one for even, >and each train has its own automated clutch. > >Something like this: > >http://www.blogcdn.com/green.autoblog.com/media/2007/09/dsg_audi.jpg > >http://images.google.com/imgres?imgurl=http://www.my-gti.com/wp-content/uploads/dsg_trans_7_speed__550nm_1.jpg&imgrefurl=http://www.my-gti.com/887/volkswagen-dsg-7-speed-dual-clutch-gearbox-high-output&usg=__HFLOWMT2oKZ_i_DYIYjnc-zry5g=&h=905&w=1280&sz=221&hl=en&start=137&sig2=GfNeSyQkB6wul0biVhiuJQ&um=1&tbnid=1b9WYcJGttn2QM:&tbnh=106&tbnw=150&prev=/images%3Fq%3Daudi%2Bdrive%2Btrain%2Bdual%2Bclutch%26ndsp%3D20%26hl%3Den%26sa%3DN%26start%3D120%26um%3D1&ei=esMnS9OnHYmssQPA6fG1DA > > >John I'll be damned. It looks like someone figured out the automatic clutch. Of course it takes integrated engine controls to make this tractable (in the engineering sense).
From: JosephKK on 17 Dec 2009 00:08 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.
From: JosephKK on 17 Dec 2009 00:13 On Tue, 15 Dec 2009 14:27:20 -0600, Vladimir Vassilevsky <nospam(a)nowhere.com> wrote: > > >Joerg wrote: > > >> Not sure, since the automatic can't see a slope or a curve coming up. >> Maybe some day it can and it's all GPS-linked. > >Then it also has to account for what is going on in the front and in the >back, how is the weather and zillion of other factors. > >>> I keep hoping that one of these days an inexpensive and reliable >>> continuously variable transmission finds its way into cars. >>> > >> Would be nice but I am quite happy with the manual transmission in my >> car. Does the job and contains no electronics that could fry. > >Agreed. There is only one inconvenience with manual: when you have to >eat while driving through a city. > >VLV > Aye, that could get you a bit busy. Just don't add talking on a phone.
From: Michael A. Terrell on 17 Dec 2009 03:01
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. -- Offworld checks no longer accepted! |