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> Drive by wire, getting rid of another cable, Electronic pedal, not a wa wa
Gunn1
post Nov 24 2016, 10:41 AM
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Anyone have a drive by wire set up on their 914? Looking for a cable-less solution to throttle control. Would be for a stock 75' 914 2.0liter. (IMG:style_emoticons/default/driving.gif)
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jim_hoyland
post Nov 24 2016, 10:49 AM
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QUOTE(Gunn1 @ Nov 24 2016, 08:41 AM) *

Anyone have a drive by wire set up on their 914? Looking for a cable-less solution to throttle control. Would be for a stock 75' 914 2.0liter. (IMG:style_emoticons/default/driving.gif)


That would be BIG ! (IMG:style_emoticons/default/smile.gif)
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bandjoey
post Nov 24 2016, 10:53 AM
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Sounds like get rid of 1 cable to add 30 electric wires a computer and an electric server motor.
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Gunn1
post Nov 24 2016, 10:59 AM
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QUOTE(bandjoey @ Nov 24 2016, 10:53 AM) *

Sounds like get rid of 1 cable to add 30 electric wires a computer and an electric server motor.


No, don't think so. pedal with a transmitter and power supply, and a actuator motor with receiver mounted on the TPS with a power supply. Think the complexity is in the electronics. (IMG:style_emoticons/default/popcorn[1].gif)
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bandjoey
post Nov 24 2016, 11:28 AM
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Bring it on. This could be your claim to fame. Will b watching this. (IMG:style_emoticons/default/smash.gif)
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stugray
post Nov 24 2016, 11:29 AM
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This would be low complexity.

One arduino module (about $10, the size of a postage stamp) one variable resistance throttle pedal (Guido Simplex sells these) or a PWM model from modern car would work too, and one servo motor.

The arduino would read the potentiometer (resistance) via an analog channel (or the PWM signal via digital channel).
It would then drive one of it's outputs with another PWM signal to the servo motor.

The servo motor only requires power in and the PWM signal to command a position.

There would be a tiny amount of code in the arduino to "smooth" the signal but it would be trivial.

You just want to find a servo that has no problem driving the throttle input
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Chris914n6
post Nov 24 2016, 12:11 PM
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I've done the opposite on a 350z motor. What do you hope to gain?
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Gunn1
post Nov 24 2016, 12:20 PM
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QUOTE(Chris914n6 @ Nov 24 2016, 12:11 PM) *

I've done the opposite on a 350z motor. What do you hope to gain?


Cable tube in tunnel is in bad shape, replacement and or proper rerouting of new cable. Just saw it as a possible modern solution to take care of a old problem.
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Mueller
post Nov 24 2016, 12:43 PM
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QUOTE(stugray @ Nov 24 2016, 09:29 AM) *

This would be low complexity.

One arduino module (about $10, the size of a postage stamp) one variable resistance throttle pedal (Guido Simplex sells these) or a PWM model from modern car would work too, and one servo motor.

The arduino would read the potentiometer (resistance) via an analog channel (or the PWM signal via digital channel).
It would then drive one of it's outputs with another PWM signal to the servo motor.

The servo motor only requires power in and the PWM signal to command a position.

There would be a tiny amount of code in the arduino to "smooth" the signal but it would be trivial.

You just want to find a servo that has no problem driving the throttle input



The 2 Audi gurus that have done this conversion to their 914s would know best, but I am pretty sure the pedal has 2 pots, one +5vdc and one -5vdc or something like that, redundancy in case something goes wrong.

This is one of those projects that if you cannot figure out on your own you shouldn't be doing it, other peoples lives are at stake.
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Rand
post Nov 24 2016, 01:23 PM
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Don't feed the troll
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Elliot Cannon
post Nov 24 2016, 01:27 PM
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I'm a big believer in keeping things simple but I encourage people to do things like this. Sounds like a good project. However if you start something like this keep us all posted on the results.
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ConeDodger
post Nov 24 2016, 01:32 PM
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QUOTE(bandjoey @ Nov 24 2016, 02:28 PM) *

Bring it on. This could be your claim to fame. Will b watching this. (IMG:style_emoticons/default/smash.gif)


Oh come on. He already has a claim to fame. (IMG:style_emoticons/default/stirthepot.gif) (IMG:style_emoticons/default/happy11.gif)
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Mikey914
post Nov 24 2016, 01:41 PM
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Sometimes best to keep it simple. Remember aircraft now use this feature in most production today. But , hundreds of millions of dollars went into design, and here's the real key .........Redunancy!

If you get into an accident and there's any possibility this apparatus could even be thought to have been involved, your hosed.
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Gunn1
post Nov 24 2016, 02:57 PM
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Your probably right, must likely the reason there is not a plug and play kit available. I'm not a liability attorney, but couldn't the same be said for some non factory modifications that potentially caused the accident.
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Elliot Cannon
post Nov 24 2016, 03:19 PM
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"Open the pod bay doors please HAL". "I'm sorry Dave". (IMG:style_emoticons/default/biggrin.gif)


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stugray
post Nov 24 2016, 04:21 PM
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I knew a brilliant guy at work that would say "you cant TRUST those new-fangled PLCs!" (Programmable Logic Controllers).

I said "Then I guess you never go near factories or power plants or ride on elevators huh?"
I just got a blank stare.
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Chris914n6
post Nov 24 2016, 04:45 PM
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I think the tube is just brazed on at the firewall. There is a pic of a cut out tunnel floating around somewhere that would help.

For some good reading... Nissan FSM. Any of the 350z would be a good choice as they have specs. 0-5v and a redundant sender on the pedal. Wires to the ECU so off hand I don't think one will control the other without a translator (ECU).
eGas is a Bosch tech so most, if not all, of it should be compatible.
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Mueller
post Nov 24 2016, 05:59 PM
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QUOTE(Gunn1 @ Nov 24 2016, 12:57 PM) *

Your probably right, must likely the reason there is not a plug and play kit available. I'm not a liability attorney, but couldn't the same be said for some non factory modifications that potentially caused the accident.



https://m.summitracing.com/parts/lok-xdbw-6...kxbEaAtAp8P8HAQ


Plus you need another module that cost $300+ .... see tab for other parts

So yes it can be done with properly engineered parts.
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stugray
post Nov 24 2016, 06:22 PM
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The project for a variable resistor type pedal is one of the most basic tutorials for an arduino:
https://www.arduino.cc/en/Tutorial/Knob
and is literally 10 lines of code

If you used the other type of gas pedal (PWM) & I had to read the PWM signal, it would be slightly more complicated as I would need to use one of the digital inputs to determine the pulse width from the pedal
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jd74914
post Nov 24 2016, 06:48 PM
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This is one of those questions where if you have to ask you really shouldn't be doing it...

The difference between an arduino and PLC is the hardened electronics. The coding is trivial, but I would really not trust the reliability of an ardiuno in a life or death application.

My car is going to DBW with an aftermarket engine controller, but using oem components like BarryM used for his car wouldn't be too hard.
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