Nov 17 2016, 09:50 AM
QUOTE(wankel @ Nov 14 2016, 11:07 AM)
Now for a technical post from me hoping others may be curious.
I'm interested in jury rigging a cruise control and consider the AU$600 price online for aftermarket units to be way too high.
My first step is to see if I can rig up remote throttle control which would mean splicing into the wires of the pedal potentiometer.
My measuring of the plug found pins 5 and 6 each supply 5 Volts to the two separate pots in the pedal control, pins 2 and 3 are the earths for each of those, and pins 4 and 1 are the voltage return that provides throttle input, pin 4 varies from 0.55 V at idle to 4.70 Volts at full throttle, Pin 1 I figure is the error check signal which varies from 0.27 V to 2.35 V conveniently half the main signal so quite simple to rig up a voltage divider to provide that input.
My plan is to take one of the 5V and Ground inputs, run them through an adjustable voltage regulator then feed the output to line 4 and run the output through a simple two resistor voltage divider also to pin 1, I'm thinking by running the voltage directly like that it will mean not having to disconnect the plug from the pedal sensor with the voltages overruling it. I haven't tested anything yet while I wait for some bits to arrive but if anybody has any thoughts and experience here I'm all ears.
BTW one internal pedal pot is pins 3,4,5 the other one is 1,2,6.
I had been thinking about doing this for some time. Option that I am considering include:I'm interested in jury rigging a cruise control and consider the AU$600 price online for aftermarket units to be way too high.
My first step is to see if I can rig up remote throttle control which would mean splicing into the wires of the pedal potentiometer.
My measuring of the plug found pins 5 and 6 each supply 5 Volts to the two separate pots in the pedal control, pins 2 and 3 are the earths for each of those, and pins 4 and 1 are the voltage return that provides throttle input, pin 4 varies from 0.55 V at idle to 4.70 Volts at full throttle, Pin 1 I figure is the error check signal which varies from 0.27 V to 2.35 V conveniently half the main signal so quite simple to rig up a voltage divider to provide that input.
My plan is to take one of the 5V and Ground inputs, run them through an adjustable voltage regulator then feed the output to line 4 and run the output through a simple two resistor voltage divider also to pin 1, I'm thinking by running the voltage directly like that it will mean not having to disconnect the plug from the pedal sensor with the voltages overruling it. I haven't tested anything yet while I wait for some bits to arrive but if anybody has any thoughts and experience here I'm all ears.
BTW one internal pedal pot is pins 3,4,5 the other one is 1,2,6.
1. Micro-controller. Looking at Arduino UNO etc.
2. Adjustable voltage regulator.
3. Potentiometer.
4. Wire and pulley.
The best option is using micro-controller with the advantage of having full control of everything (eg. disengage by brake, remap the throttle responsiveness...etc). Disadvantage is the complexity in getting things to work with safety and reliability in mind.
I am considering the adjustable voltage regulator option. There are 2 approaches for this option. Use common adjustable vr such as LM317 or get more sophisticated digital adjustable VR. I am more toward the second approach. I found one selling around 5-10 USD with 0.04v step (hint: winner). However, I have concern with the output of digital adjustable VR. They are likely to be PWM and I do not know whether this will be an issue for the ECU.
I am also looking for the male and female connectors for the paddle. Do not want to cut any wires. Let me know if you know where to source them.
Anyway, I am very interested with your diy project. Please keep us updated.
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