DIY electronic throttle and gearbox control

[CDK]

The new construction employs two linear actuators from Firgelli Automation, a somewhat modified electronics circuit and 2 short bowden cables to the injection pumps.
Reason was the rapid wear of the previous version that was mounted directly on top of the pumps.

This time I used TLC271 amplifiers because they deliver more output current, especially when pulling up towards the 12V supply voltage. Should anyone be interested in the circuit diagram, please ask.

[pistnbroke]

Always interested in your circuits CDK .can we have a look ....I understand your current concerns which is why I installed relays .......have the original circuit still working but not installed as engine installaton still under review/test

[CDK]

The circuit drawing is believed to be accurate but was just intended for my own reference. The Firgelli actuators could have moved a bit faster; with this circuit they slow down when the required position is approaching so there is no overshoot.

[pistnbroke]

Thanks very usefull....I did not get any overshoot even with the relays and about 1mm increments with an 8 inch throw linear motor ....

[CDK]

Something I forgot to mention:
I made two devices to allow the actuators to pull a bit further than full throttle. This makes adjustment quite a lot easier.

Inside is a plunger and a compressed coil spring, stronger than the return spring on top of the injection pump. If the end of the stroke is reached, the spring can still be compressed approx. half an inch.

[MihaS]

Hi CDK and all

Now on the end of summer i will go with new project. And I have i few questions ,for gear actuator and throtle actuator.
Why didnt you use servo engines used in model aircraft,I found 12v with 15-30kg torq,they are in plastic case and waterproof.

some example
http://www.ebay.com/itm/17kg-3S-12V-...item1e6343d220

[thudpucker]

RE: your second post.
I did like the looks of your Electronics.

I just cannot bring my self to rely on them.
Three friends spent some time in Cook inlet because the boat suddenly helmed to Stb and rolled the boat while under way.

It's better these days with all the Processor based stuff where the Fail/Safe is 0-0 with the processor watching ever 10 msec.

I want the one hooked to the GPS and the Clock.
It would be programmed to take me from one fishing hole to the next as long as I didn't interrupt it. You wouldn't want to leave a productive hole now!

[CDK]

Originally Posted by MihaS

Hi CDK and all

Now on the end of summer i will go with new project. And I have i few questions ,for gear actuator and throtle actuator.
Why didnt you use servo engines used in model aircraft,I found 12v with 15-30kg torq,they are in plastic case and waterproof.

There's more than one way to grab a cat.
I used leftover parts from my shed. If you succeed in using aircraft servos, be so kind to post the results here.