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Old 31st January 2011, 09:59   #46
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Default Re: Drive by Wire Technology

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Originally Posted by @400Kph View Post
... most of the cars are now x-by-wire , where in replace "x" by Steer , Brake , throttle ,shift etc. ...
Ooer! Which cars have Steer-by-wire and Brake-by-wire? Wouldn't x-by-wire necessarily mean that the driver gives inputs (sensed by a sensor) to an ECU, but there is no other direct link from driver to the controlled element x?

Steer-by-wire is in experimental stage (has been for the last 10 years), and is unlikely to make an appearance in the next 10. Brake-by-wire will have ambulance-chasers salivating if and when it appears.
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Old 31st January 2011, 19:02   #47
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Default Re: Drive by Wire Technology

you are right about steer by wire being prototype stage but there were 2-3 prototypes displayed in the past.One of them is in benz musuem stuttgart ( Benz F200 prototype).As for the brake by wire there were cars such as Benz had it in Sl500 and E class which was later recalled and entire programme was cancelled.nissan and BMW too had anounced but not sure whether it is already in mass produtcion.By the way what do you mean by " Brake-by-wire will have ambulance-chasers salivating if and when it appears. " ??
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Old 31st January 2011, 19:27   #48
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Default Re: Drive by Wire Technology

I think the Manza Safire has a drive by wire throttle control system if i am not wrong. The accelerator is really smooth.

off topic: Even i have driven my bike by wire (Thats true drive by wire throttle control)... LOL :-))
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Old 1st February 2011, 13:56   #49
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Default Re: Drive by Wire Technology

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... By the way what do you mean by " Brake-by-wire will have ambulance-chasers salivating if and when it appears. " ??
"Ambulance chasers" - guys who run behind people injured in accidents to help claim insurance (and make money for themselves) - will be the first to benefit in liability claims for brake system failures. And that is no chump change - such claims run to millions of $$$!
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Old 1st February 2011, 14:15   #50
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Default Re: Drive by Wire Technology

Drive by wire does not mean,operating something by wires or cabls . If you go by the name literally ,all electrical appliances like fan,bulbs even mixer grinders would have been żby wire from early 1900 when they first emerged.
Nor does it mean replacing a mech linkage by an electrical or electronic one to save weight or whatever.
Drive by wire tech first emerged in US navy planes, they had to align plane while landing to a short deck which was full of arrestor wires. There were far too many variables ,and things often went ugly while landing,specially due to rolling and pitching of the carrier.
New system for landing was implemented,later version of which came to be known as ILS. It took ship's aswell as aircrafts approach into account along with wind direction and lot of other factors.
Its primary job was to refine and correct pilots inputs according to need of the hour.
For ex- if the pilot forgot/made an error ,ils automatically took control of rudders,throttle and flaps.
In short drive by wire tech takes operator's/driver's will as an intent and not the actual input in order to save/optimise the system. In drive by wire car if you slam on the throttle/gas pedal, the ecu takes it only as your will,but not as an order.
Ecu will understand that driver wants emergency level acceleration,but this does not mean it will max out the injection pulses despite your input. It still will gradually increase them according to increase in RPM /AIR TEMP,LOAD ETC.
Driver may not know but ecu does,that there is absolutely no use dumping in too much fuel in the engine and cause over fueling.
Drive by wire takes this input (100%. Throttle), as your desire, but how to get to 100%,how long to take and ifatall 100% should be given is decided by chip not by you.
In Drive/throttle/fly by wire tech operators input is refined or corrected by electronics,hence there is no direct link between operator and the operated,they are only connected through an interface.
I am sorry guys but holding a cable in your hand while riding a mobike,is not drive by wire. Otherwise bicycles would always be brake by wire!
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Old 1st February 2011, 16:06   #51
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Default Re: Drive by Wire Technology

@dustom-bhai, sometimes one has to enjoy spontaneous humor rather than looking at logic behind statements.

Only modern bicycles are brake-by-wire - they were earlier brake-by-rod-linkages, like most motorcycles. Of course, if you look at front brakes in motorcycles, they were always brake-by-wire.
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Old 18th May 2011, 11:29   #52
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Default Re: Drive by Wire Technology

Guys,

I need some help with steer-by-wire SWB possibilities in India,

A little info I know form YTD's Search engines are as below:
Drive-by-wire has 3 major components
1. Throttle-by-wire (most commonly employed)
2. Steer-by-wire Very Rear, but present in very limited cars, (like BMW 5 Series sedan & some concepts, also in Tractors !! )
3. Break-by-wire (not used & recalled in some models

One such work done by IIT Bombay

I am interested in steer-by-wire right now, & requesting people with relevant info to post the same or PM me.
What we are trying to do is NOT for on-road or Main-stream use, its more for a FUN DEMO project to control a car remotely, some thing like this done for a car without x-by-wire





Cheers
Sunil
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Old 19th May 2018, 20:29   #53
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Default Re: Drive by Wire Technology

Fast forward - 2018!

I saw a demo of Mahindra E20 being remote controlled for platooning operations. Can anyone confirm that E20 indeed has ride by wire for lateral and longitudinal control?
Attached Thumbnails
Drive by Wire Technology-20180319photo00000012.jpg  

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Old 19th May 2018, 21:08   #54
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Default Re: Drive by Wire Technology

I did not know about this thread till today. After reading all pages, the topic has veered from throttle by wire to clutch by wire to steer by wire!

I was under the impression that the Fiesta 1.6 had a drive-by-wire throttle. I was told that owing to that, the FE increased to 10+ kmpl when compared to the Ikon Zetec that basically had a similar engine.

One thing I noticed was that when i floor the throttle in 3rd gear and release it abruptly, the tacho shows the same revvs being maintained for around 3 seconds, and the speed does not drop. On the other hand, the speed on my WagonR drops abruptly. I thought it was due to this, the FE of the Fiesta 1.6 more or less is the same as my F10 WagonR (sudden changes in RPM give lower FE).

Now I am totally confused!
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Old 22nd May 2018, 00:52   #55
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Default Re: Drive by Wire Technology

Quote:
Originally Posted by vnabhi View Post
I was under the impression that the Fiesta 1.6 had a drive-by-wire throttle.
One thing I noticed was that when i floor the throttle in 3rd gear and release it abruptly, the tacho shows the same revvs being maintained for around 3 seconds, and the speed does not drop. On the other hand, the speed on my WagonR drops abruptly. I thought it was due to this, the FE of the Fiesta 1.6 more or less is the same
I have no idea whether the Fiesta 1.6 has a drive-by-wire technology or not, but I think the gradual decrease in RPM after flooring is controlled by the ECU/ECM. We have a 2010 i10 in our family, this car has an accelerator cable & even here the RPM doesn't drop abruptly after releasing the throttle, the behavior is similar to the Fiesta 1.6. Hence, at least in the i10 the ECU/ECM must be responsible for the rise in RPM during gear change.

But the Marutis that I have driven doesn't seem to show this phenomenon, i.e to hold the RPM for a few seconds after releasing the throttle. I haven't noticed this phenomenon in cars like the old WagonR, Zen, Alto (k10 included), M800. Maybe the newer Marutis would behave differently.

Here is a link to a similar thread - http://www.team-bhp.com/forum/techni...ed-normal.html (i10 1.2: RPM goes up when clutch is pressed. Normal?)

Last edited by chiranjitp : 22nd May 2018 at 01:01.
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