DIY electronic throttle and gearbox control

Discussion in 'OnBoard Electronics & Controls' started by CDK, Apr 3, 2008.

  1. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    3rd solution

    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.
     

    Attached Files:

  2. pistnbroke
    Joined: Jan 2009
    Posts: 1,405
    Likes: 33, Points: 48, Legacy Rep: 404
    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    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
     
  3. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    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.
     

    Attached Files:

  4. pistnbroke
    Joined: Jan 2009
    Posts: 1,405
    Likes: 33, Points: 48, Legacy Rep: 404
    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    Thanks very usefull....I did not get any overshoot even with the relays and about 1mm increments with an 8 inch throw linear motor ....
     
  5. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    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.
     

    Attached Files:

  6. MihaS
    Joined: Jan 2011
    Posts: 45
    Likes: 2, Points: 8, Legacy Rep: 29
    Location: Adriatic

    MihaS Junior Member

  7. thudpucker
    Joined: Jul 2007
    Posts: 885
    Likes: 31, Points: 0, Legacy Rep: 453
    Location: Al.

    thudpucker Senior Member

    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! :)
     
  8. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    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.
     
  9. callnoori
    Joined: Jan 2014
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: ezhimala ,kerala ,india

    callnoori New Member

    electronic throttle contol

    good afternoon sir,
    we are a group of Cadets working on to design a remote control rescue boat (RCRB ) . we managed to get a permanent magnet DC motor , torque 300kg/cm ,2.5 amps , 12 volt, FL RPM 3.5. and modified it to fit on a
    [​IMG] kind of controls .
    the first trial run was a disaster . the motor broke the control and the rib crahed on the jetty after one complete month we were back and did managed to run the RCRB . with present atmega 16 microcontroller and XBEE transmission module . it worjked well for a duration of 20 min before the battreries went dry for the motor and controller circuit. may i request tyo to guide to develop a similar kind of system las usedd b you . w are using a yamaha 40 hp obm . for our RCRB . regards
     
  10. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    For a remote controlled engine I would use a small stepper motor or servo like MihaS suggested. When programming the uPC, set conditions that immediately force the throttle back to idle, like low battery voltage and loss of signal. If the condition persists, you may want to shut down the engine completely.
     
  11. pistnbroke
    Joined: Jan 2009
    Posts: 1,405
    Likes: 33, Points: 48, Legacy Rep: 404
    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    This sounds like the stupidest idea I have heard. Having ridden in a boat it is the senses of the driver that cause minor changes to be made due to sea conditons....However if you insist a KISS aproach is required.
    I would use a standard RC TX RX for reliablity . The servo should should easily handle the throttle by direct connection to the carb and a linear actuator driven by the circuit in this article works good. Connect the servo to the control pot. I have replaced the MOSFETS with two change over relays to reverse the linear motor and its fine for gear change applications.
    Hope you got a big guard on the prop like an australian surf rescue RIB !!!! or have good insurance...

    I also suggest that the person with the transmitter sits in the RIB until you have it perfected so they can take control if it goes tit shiit
    KISS
     
  12. callnoori
    Joined: Jan 2014
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: ezhimala ,kerala ,india

    callnoori New Member

    good morning sir ,
    thank you very much for your kind words . . every engineering marvel today seemed to be a 'stupidest' idea at there inception , nonetheless we are working on your advice. and look forward to come up with a better . prototype by coming months .
    regards noori
     
  13. callnoori
    Joined: Jan 2014
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: ezhimala ,kerala ,india

    callnoori New Member

    sir , is feasible to fit the actuators directly on mechanical throttle lever . also may i request you to fwd the details of your DIY initiative to my email. callnoori@gmail.com regards
     
  14. ma5645
    Joined: May 2014
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: canada

    ma5645 New Member

    While review original design...

    CDK-
    I have a question about your original design.
    I have a sailboat, with the diesel motor. Currently, the motor is controlled by the bowden cables, coming from pedestal.

    I'm planning to add the system - similar to yours - to work in parallel with the current one. I wonder though if the strength of the motor would be enough to drive both the mechanical system and the motor ( gear, throttle...) Or, should I add some clutches?

    Thanks for your kind attention to this matter. Looking forward to hear your comments.

    Michael.
     

  15. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 146, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    If you intend to keep the original bowden cable controls you will need clutches to connect/disconnect them. The controls are designed to convert a long stroke with little power into a powerful short stroke and generally also have notches and springs to provide a distinct neutral position.
     
Loading...
Similar Threads
  1. mtumut
    Replies:
    9
    Views:
    1,841
  2. AndySGray
    Replies:
    10
    Views:
    5,902
  3. Seafarer24
    Replies:
    33
    Views:
    6,897
  4. jeb
    Replies:
    12
    Views:
    14,649
  5. allenx1966
    Replies:
    2
    Views:
    8,131
  6. lunatic
    Replies:
    0
    Views:
    2,104
  7. Elysium Tech
    Replies:
    9
    Views:
    491
  8. mordenviking
    Replies:
    5
    Views:
    1,094
  9. Sammik
    Replies:
    4
    Views:
    1,370
  10. thama
    Replies:
    3
    Views:
    1,372
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.