electronic throttle
in [Technical]
|
From: clare on 11 Mar 2010 16:06 On Thu, 11 Mar 2010 05:18:11 +0000 (UTC), "Rodan" <Rodan(a)Verizon.NOT> wrote: >Rodan wrote: > >...(adding a gas pedal position sensor) has nothing to do with saving >money. It costs more, it's more complex, it adds more electromechanical >hardware and increases electrical, mechanical, and computer interfaces. >It introduces multiple new failure modes, while yielding no significant >improvement in gas mileage or pollution control. It is a money pit, >a maintenance nightmare and a death trap waiting for a victim. >________________________________________________________________________ > >"jim beam" wrote: > >not true. electronics are much more reliable. and they /do/ offer >significant improvement in mileage and pollution control. they >offer significantly better control for things like cruise control and >automatic transmissions too. >__________________________________________________________________________ > >I may not be seeing the tradeoff benefits you refer to. >How does adding a gas pedal position sensor provide: > > "significant improvement in mileage and pollution > control and significantly better control for things > like cruise control and automatic transmissions too" ? > >Rodan. > You need to understand emission controls and engine control - which you obviously don't, in order to understand HOW ECT makes it better.
From: clare on 11 Mar 2010 16:08 On Thu, 11 Mar 2010 10:39:46 -0000, "David Skelton" <skellyd8758(a)NOSPAMsky.com> wrote: > >"dizzy" <dizzy(a)nospam.invalid> wrote in message >news:bglgp518e14fmsdkehr1dalh2886g0pu0b(a)4ax.com... >> David Skelton wrote: >> >>>I thought the main reason for ABS is to maintain steering control when the >>>brakes were pressed too hard, so hazards could be avoided. >> >> Yes. >> >>>But, ABS does not >>>work so well in the very wet or icy conditions. >> >> Sure it does. It can't perform miracles, however. >> > >No, it doesn't work so well in slippery conditions. >In slippery conditions, it is much easier to lock all four wheels at once >with a stomp on the brake pedal. Then the ABS controller cannot detect >wheels turning at different speeds which is required to activate the ABS >system. > >regards > >David > > >--- news://freenews.netfront.net/ - complaints: news(a)netfront.net --- Oh, it detects the lockup all right - and RELEASES all 4 wheels to get them turning again. Result? No brakes. They come back on again as soon as the wheels start turning - locking all 4 again - - - - - - - -.
From: clare on 11 Mar 2010 16:08 On Thu, 11 Mar 2010 05:56:04 -0500, "Ed Pawlowski" <esp(a)snetnospam.net> wrote: > > >"jim beam" <me(a)privacy.net> wrote >> not always dude. stopping distances with abs can be considerably longer, >> especially in conditions like snow. > >It allows for better steering control though, especially for the driver that >does not know how to deal with those conditions. Like I said - it makes sure you hit what you hit SQUARE ON!!
From: clare on 11 Mar 2010 16:09 On Thu, 11 Mar 2010 07:15:41 -0500, "Tom" <tc(a)comcast.net> wrote: > > >"Ed Pawlowski" <esp(a)snetnospam.net> wrote in message >news:jIGdnQ8vRK7fUQXWnZ2dnUVZ_h2dnZ2d(a)giganews.com... >> >> >> "jim beam" <me(a)privacy.net> wrote >>> not always dude. stopping distances with abs can be considerably longer, >>> especially in conditions like snow. >> >> It allows for better steering control though, especially for the driver >> that does not know how to deal with those conditions. >in snow ABS enables you to steer in a straight line as much as possible >brakes only results in a 180 or 360 turn or slide into a ditch. I doubt if >not having ABS will stop as soon as with. I drive on snow covered hills a >lot this year more than others ABS is better and yes I have been in cars >without for years and have managed but not as good as with ABS. Have had a >drivers license for 56 years. In wet sloppy snow with wide tires, ABS is TERRIBLE.
From: clare on 11 Mar 2010 16:11
On Thu, 11 Mar 2010 06:23:24 -0800, jim beam <me(a)privacy.net> wrote: >On 03/10/2010 10:45 PM, DC wrote: >> "jim beam"<me(a)privacy.net> wrote in message >> news:IeudnWYmUdD27AXWnZ2dnUVZ_tmdnZ2d(a)speakeasy.net... >>> On 03/09/2010 10:15 PM, Rodan wrote: >>>> clare(a)snyder.on.ca wrote: >>>> >>>> Toyota throttle has 2 hall effect sensors. The output of one tracks the >>>> other but is offset. In other words, one starts at say, 0 volts, and >>>> the >>>> other at, say 1 volt - and they increase in step with each other. >>> >>> how can that be true??? >>> >>> http://en.wikipedia.org/wiki/Hall_effect >>> >>> hall effect sensors are used for gross position detection, not small scale >>> linear deflections. they can be used for "wot" detection, but their >>> ability to work over a wide positioning range is limited. that's why >>> they're used in timing for things like crank position [rotational] sensors >>> where you're counting pulse rates, not graduation functions. >>> >> >> These linear Hall effect sensors do indeed exist - and being non contact are >> arguably highly reliable >> http://www.potentiometers.com/select_hall.cfm >> >> Dave >> >> > >interesting. but at >10x the price of a simple potentiometer solution, >which is afterall, also known to be highly reliable, would an auto >manufacturer really use one? They use them all the time. They are not subject to wear, electrical degradation, resistance change due to contamination, etc - etc. - etc. Absolutely no reason NOT to use them as they are SIGNIFICANTLY more reliable in the long term. |