electronic throttle
in [Technical]
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From: clare on 7 Mar 2010 23:10 On Sun, 07 Mar 2010 18:29:44 -0500, Bill Putney <bptn(a)kinez.net> wrote: >Bill Putney wrote: >> clare(a)snyder.on.ca wrote: >> >>> One throttle position sensor of the simplest design (a simple >>> potentiometer) can provide 2 signals - one the inverse of the other. >> >> Clare - I followed the rest of your explanation, but, as a circuit >> designer, I had trouble following that part. That would have to be two >> potentiometers ganged on one shaft? You're not saying that one >> potentiometer provides two signals, right? I'm picturing a TPS pot. >> with ground on one end, Vref on the other, and the wiper signal. I >> don't see getting two signals from the one pot, inverse or otherwise. >> What did I miss? > >Actually, after some thought, I can see how it might be done with a >single pot: Pot wiper gets tied to ground, and you run constant current >into each end terminal. The voltages read at the two end terminals will >be inverse of each other (as wiper is moved in one direction, voltage of >one end terminal goes from 0 to R x I, voltage of the other end goes in >the opposite direction). > >Not saying that the designers would have realized that it could be done >like that, but that's the only way I could think of using a single pot. That works too.
From: News on 7 Mar 2010 23:58 clare(a)snyder.on.ca wrote: > On Sun, 07 Mar 2010 18:05:07 -0500, News <News(a)Groups.Name> wrote: > >> clare(a)snyder.on.ca wrote: >>> On Sun, 7 Mar 2010 11:10:20 -0800, "theref" <theref(a)seanet.com> wrote: >>> >>>> "Grumpy AuContraire" <GrumpyOne(a)GrumpyvilleNOT.com> wrote in message >>>> news:99adnZJAetdSdQ7WnZ2dnUVZ_qidnZ2d(a)giganews.com... >>>>> bjn wrote: >>>>>> On Sat, 06 Mar 2010 10:38:19 -0500, Bill Putney <bptn(a)kinez.net> wrote: >>>>>> >>>>>>> jim beam wrote: >>>>>>>> if you buy all this fear-mongering idiocy that electronic throttle is a >>>>>>>> problem, and that brakes, transmissions and ignition kill switches can >>>>>>>> all simultaneously fail causing a driver to lose control, it might be >>>>>>>> worth auto manufacturers of all stripes to adopt a slightly different >>>>>>>> implementation of electronic throttle [e.t.] - if not for mechanical >>>>>>>> reasons, but to shut the idiots up... >>>>>>> The lawyers, politicians, and news media can convince the public of the >>>>>>> impossible (failure even a totally fail safe system) any time they >>>>>>> decide to do it depending on political or monetary motivation. IOW - >>>>>>> the people and companies who do a good job of designing are going to get >>>>>>> punished anyway (unless they know how to play the game in a corrupt >>>>>>> system). There are people in our society whose life goal is to make >>>>>>> sure that that happens. >>>>>> The problem is that now lawyers, politicians and news media are driving >>>>>> (no >>>>>> pun intended) solution. The way I see them talking, cars will wind up >>>>>> with >>>>>> a fail-safe throttle that is more fail-safe than the controls of a jumbo >>>>>> passenger jet. >>>>>> >>>>> I'm not sure about this but for sure... The causes you cite certainly >>>>> contributed in getting to where we're at! >>>>> >>>>> Oh, don't forget that little incident when a B-777's engines went to idle >>>>> about a minute before touch down at Heathrow about a year ago. Aircraft >>>>> was totaled but there were no major injuries. >>>>> >>>>> Cause has been assessed to software/computer glitch. >>>>> >>>>> JT >>>> I believe that was traced to icing in the fuel system. SOP now is to cycle >>>> fuel after prolonged low temp at altitude. >>> Icing on a JET????????? >>> Don't think so. >> >> Absolutely. Determined to be cause of BA 777 landing short at Heathrow. > > OK - I looked it up. Technically this was fuel jelling - common with > diesel fuel in arctic conditions. In the case of the Rolls turbines, > it was a design fault in the fuel pre-heater unit which resulted in a > mandatory replacement with a redesigned heat exchanger. > > Different than the carb icing on a prop plane. It was ice in the fuel blocking the pre-heater, not fuel jelling. Get it straight.
From: cuhulin on 8 Mar 2010 00:19 Did ABC News doctor its report on runaway Toyota test? http://toyotaconversations.com/story/680129149/did-abc-news-doctor-its-report-on-runaway-toyota-test I wouldn't doubt it. ABC = All Bout Communism. CBS = Communist Broadcasting System. NBC = Nothing But Communism. Ministry of Propaganda. cuhulin
From: Jim Warman on 8 Mar 2010 00:21 Nothing I love more than seeing someone with egg on their face... Ford Escape was a precursor... and now, anything with active park assist... Please don't make me dig through the option lists... Taurus would be another and likely MKZ, Edge... maybe Flex... Electric power steering is the future coming to life... from an NVH standpoint as well as other considerations... FWIW, I can't comment for other marques... Vehicles are far too complex these days for anyone to call himself an "all make" technician. BTW... I'm sorry I didn't make you scroll to the bottom of a whole bunch of drivel you already read just to read my reply... Everyone wants to "bottom post" but they all want to butt in front of me in line at the bank... "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:hmum00$agr$1(a)news.eternal-september.org... > > "jim beam" <me(a)privacy.net> wrote in message > news:ntSdnbrMg8YIRw_WnZ2dnUVZ_jEAAAAA(a)speakeasy.net... >> On 03/06/2010 01:30 PM, Bob Cooper wrote: >>> In article<hmuep4$qd2$1(a)news.eternal-september.org>, >>> crwlrjeff(a)yahoo.com says... >>>> >>>> >>>> This is the most important part? >>>> >>>> It's nonsense! The gas pedal does two things, opens the throttle plate >>>> and >>>> closes the throttle plate. Period. >>>> >>>> You should ride the bus. >>> >>> Nonsense? Where have I heard that before? >>> This is what you get if you're foolish enough to to let somebody who >>> names himself after a whiskey, whose logic is limited to the HTML >>> programming he's done for a Toyota fanboy website, and thinks EPS uses a >>> pump - design automobile throttling. >>> Don't worry, nobody in charge of such things is that foolish. >>> Well, maybe Toyota was. And look where it got them. >> >> get some experience bob. some cars do use electric pumps for power >> steering. toyota is one of them. not all models, but some. >> > > Cite. > > Toyota's electric steering does not use an electric motor to drive a > hydraulic pump. There are makes that use such a system, but Toyota isn't > among them, and certainly the Corolla does not use that system, which is > the model that is having steering problems. > > > > >
From: Jim Warman on 8 Mar 2010 00:27
Actually, in the modern automobile, the gas pedal tells the PCM that you want to go faster... A lot of you folks are gong to be disappointed in the near future... The headlight switch tells the BCM that you want to turn on some lights... the turn signal switch tells the BCM that you wnat to turn on some flashing lights... This is gonna be cool... "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:hmuep4$qd2$1(a)news.eternal-september.org... > > "jim beam" <me(a)privacy.net> wrote in message > news:uqOdnfZrX4eWKQ_WnZ2dnUVZ_qIAAAAA(a)speakeasy.net... >> On 03/06/2010 09:03 AM, Jeff Strickland wrote: >>> "jim beam"<me(a)privacy.net> wrote in message >>> news:fvudnV-hwr-Z6A_WnZ2dnUVZ_rednZ2d(a)speakeasy.net... >>>> if you buy all this fear-mongering idiocy that electronic throttle is a >>>> problem, and that brakes, transmissions and ignition kill switches can >>>> all >>>> simultaneously fail causing a driver to lose control, it might be worth >>>> auto manufacturers of all stripes to adopt a slightly different >>>> implementation of electronic throttle [e.t.] - if not for mechanical >>>> reasons, but to shut the idiots up. >>>> >>>> first, lets understand e.t. functionality: >>>> >>>> 1. open the throttle when demanded >>>> 2. close throttle when demanded >>>> 3. allow "demand" to account for additional requirements like >>>> a. de-throttle on shifting for automatics, >>>> b. throttle appropriate to load at high demand [eg. full throttle at >>>> low >>>> rpms can choke an engine and significantly reduce output - thus >>>> de-throttle until revs support full open] >>> >>> >>> The functionality is even easier than that -- open the throttle plate >>> when >>> the gas pedal is pressed and close the throttle plate when the gas pedal >>> is >>> released. You can get bogged down in semantics if you want, but the >>> functiionality is really that simple Go when the pedal is pressed and >>> stop >>> going when the pedal is released. At the end of the day, anything else >>> is a >>> variation on pushing the pedal down or releasing the pedal so that it >>> comes >>> back up. >> >> yeah, that meets conditions 3.a & 3.b. oh, wait, no it doesn't. >> > > > This is the most important part? > > It's nonsense! The gas pedal does two things, opens the throttle plate and > closes the throttle plate. Period. > > You should ride the bus. > > > > > |