NHC drive by wire?

sreenidhibr · 13th November 2007, 11:40

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.

gd1418 · 13th November 2007, 12:42

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.

Quote:

Originally Posted by sreenidhibr

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.

androdev · 13th November 2007, 13:11

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.

spadival · 13th November 2007, 13:58

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 !!

gd1418 · 13th November 2007, 14:07

Can you please elaborate under what driving circumstances the Check Engine light popped up?

Quote:

Originally Posted by spadival

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 !!

midlifecrisis · 13th November 2007, 14:25

Quote:

Originally Posted by androdev

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.

spadival · 13th November 2007, 14:27

Quote:

Originally Posted by gd1418

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.

Randhawa · 16th November 2007, 05:52

Quote:

Originally Posted by androdev

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.

nitrous · 16th November 2007, 13:09

When Me and Neoranjit were TDing the SX4 before he bought it.
He mentioned about this throttle response lag.
I didnt feel it though.

n_aditya · 16th November 2007, 14:14

Quote:

Originally Posted by midlifecrisis

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.

mdesai_1981 · 8th February 2009, 20:24

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?

dr chill · 8th February 2009, 20:48

yes it is drive by wire

Rehaan · 8th February 2009, 21:30

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

ilangop · 8th February 2009, 22:54

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.

13th November 2007, 13:11	#3
androdev Distinguished - BHPian Join Date: May 2007 Location: bangalore Posts: 3,255 Thanked: 25,287 Times	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.
	() Thanks

13th November 2007, 13:58	#4
spadival Senior - BHPian Join Date: Oct 2004 Location: Melbourne, AU Posts: 1,772 Thanked: 29 Times View My Garage	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 !!
	() Thanks

16th November 2007, 13:09	#9
nitrous Senior - BHPian Join Date: May 2004 Location: UAE/Lon/Madras Posts: 6,965 Thanked: 333 Times View My Garage	When Me and Neoranjit were TDing the SX4 before he bought it. He mentioned about this throttle response lag. I didnt feel it though.
	() Thanks

8th February 2009, 20:24	#11
mdesai_1981 BHPian Join Date: Apr 2008 Location: Mumbai Posts: 188 Thanked: 29 Times View My Garage	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?
	() Thanks

8th February 2009, 20:48	#12
dr chill BHPian Join Date: Apr 2006 Location: delhi Posts: 95 Thanked: Once	yes it is drive by wire
	() Thanks

8th February 2009, 21:30	#13
Rehaan Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 24,217 Thanked: 36,119 Times	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.
	() Thanks

8th February 2009, 22:54	#14
ilangop BHPian Join Date: Jul 2008 Location: Chennai Posts: 993 Thanked: 928 Times View My Garage	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.
	() Thanks