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Old 13th November 2007, 11:40   #1
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Default Drive by wire technology

I found this article on drive by wire technology Driving by wire - Autonet.ca

The last para says:
Quote:
Next time you take a new car out on a test drive, take notice of the throttle response. You might find a slight hesitation, then sudden acceleration. If this is the case, the vehicle you are testing most likely has a "Drive-by-wire" system.
Is this why my SX4 appears to have low pickup? Or any other reasons to get checked during servicing?

Also, are mechanics / service centers knowledgeable enough in Bangalore, especially with these new cars? I am asking this question since the sales guys knowledge levels about car technology was less than mine :-( And i am no expert either.
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Old 13th November 2007, 12:42   #2
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This is the bane of our auto industry and also that of executives (sales & service) working at various dealers.

The highly educated & knowledgeable team in the R&D comes out with a new product and is then put out for public. But alas, the company trains the dealer network on this new product for only a fortnight or so. The ground level mechanics are no better than the roadside ones since they too at one time were the same.

The sale executives manning the counters are mere graduates with no specialised knowledge of automotive world. They parrot out details that they hve been taught during their training period. Ask one basic technical question and observe the befuddled look on their visage.

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Originally Posted by sreenidhibr View Post
Also, are mechanics / service centers knowledgeable enough in Bangalore, especially with these new cars? I am asking this question since the sales guys knowledge levels about car technology was less than mine :-( And i am no expert either.
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Old 13th November 2007, 13:11   #3
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this hesitation business is rubbish.. it is stone-age stuff to convert an analog-to-digital-to-analog (which is what happens in drive-by-wire).. there will be no lag what so ever.. at least not something which humans can perceive.

however, the computers don't blindly do analog-to-digital-to-analog. instead.. they do analog-to-digital-process-analog. computer can potentially override the pedal input given by the human to get better mileage, protect the engine and so on. for instance, if you press brake and accelerator pedal simultaneously, there will not be any fuel injected.
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Old 13th November 2007, 13:58   #4
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The other day, the "check engine" light came on in my brother's Palio D. Guess what, the accelerator pedal stopped working !! Its either a problem with the drive by wire system or the ECU is protecting the engine !!
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Old 13th November 2007, 14:07   #5
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Can you please elaborate under what driving circumstances the Check Engine light popped up?

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Originally Posted by spadival View Post
The other day, the "check engine" light came on in my brother's Palio D. Guess what, the accelerator pedal stopped working !! Its either a problem with the drive by wire system or the ECU is protecting the engine !!
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Old 13th November 2007, 14:25   #6
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Quote:
Originally Posted by androdev View Post
this hesitation business is rubbish.. it is stone-age stuff to convert an analog-to-digital-to-analog (which is what happens in drive-by-wire).. there will be no lag what so ever.. at least not something which humans can perceive.

however, the computers don't blindly do analog-to-digital-to-analog. instead.. they do analog-to-digital-process-analog. computer can potentially override the pedal input given by the human to get better mileage, protect the engine and so on. for instance, if you press brake and accelerator pedal simultaneously, there will not be any fuel injected.
The Petra D has drive by wire technology and is considered the best car to drive in its class.
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Old 13th November 2007, 14:27   #7
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Quote:
Originally Posted by gd1418 View Post
Can you please elaborate under what driving circumstances the Check Engine light popped up?
It came on BEFORE I cranked the ignition. I was able to start the engine, but accelerator just doesn't work. Need to check with my brother on what is the status once he gets the car checked.
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Old 16th November 2007, 05:52   #8
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Quote:
Originally Posted by androdev View Post
this hesitation business is rubbish.. it is stone-age stuff to convert an analog-to-digital-to-analog (which is what happens in drive-by-wire).. there will be no lag what so ever.. at least not something which humans can perceive.

however, the computers don't blindly do analog-to-digital-to-analog. instead.. they do analog-to-digital-process-analog. computer can potentially override the pedal input given by the human to get better mileage, protect the engine and so on. for instance, if you press brake and accelerator pedal simultaneously, there will not be any fuel injected.
Have you driven a car with drive by wire system? I assume you havent, otherwise you would have noticed the difference. I have and yes you can tell the difference for eg any BMW E46 or the 840i M62, E90,91 and many other models.
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Old 16th November 2007, 13:09   #9
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When Me and Neoranjit were TDing the SX4 before he bought it.
He mentioned about this throttle response lag.
I didnt feel it though.
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Old 16th November 2007, 14:14   #10
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Quote:
Originally Posted by midlifecrisis View Post
The Petra D has drive by wire technology and is considered the best car to drive in its class.
The honda civic also has the same technology right? I took the auto version with paddle shifts for a spin and didnt feel any sorta lag in acceleration especially in sport mode. Some reporters dont know jack$hit about what they publish half the time.
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Old 8th February 2009, 20:24   #11
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Default NHC drive by wire?

hi guys i just wat to know whether my NHC (i-dsi engine) is equipped with drive by wire technology or no?
pls advice how to find it?
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Old 8th February 2009, 20:48   #12
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yes it is drive by wire
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Old 8th February 2009, 21:30   #13
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Mdesai,

First of all, drive-by-wire as a classification encompasses a lot, and is fairly unspecific. Naturally marketing divisions of car companies use this to their advantage.

What it means is that a mechanical or hydraulic linkage has now literally been replaced with a "wire" - that is carrying the required information from one end to the other.
The system uses sensors for input and other parameters and actuators to carry out the action the mechanical/hydraulic link would usually have done (as well as provide tactile feedback to the driver if required).

The drive by wire systems typically include:
1. Throttle by wire
2. Steer by wire
3. Brake by wire

Steer by wire and especially brake by wire are not commonplace. If im not mistaken, the NHC only has throttle by wire. (The wire replaces the throttle cable).

cya
R

Last edited by Rehaan : 8th February 2009 at 21:34.
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Old 8th February 2009, 22:54   #14
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Hi Guys,
As much I know, all CRDI or ECU controlled diesel engines need an electrical input for the throttle position. This signal goes directly to the ECU. The ECU now takes care of the timing and duration of fuel injection.
On the other hand for petrol vehicles which have an electronically controlled throttle body we would need this throttle by wire.
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