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Still Trying to come up with a cruise control that works on an off road vehicle

Discussion in 'Automotive Electronics' started by kinarfi, Apr 25, 2012.

  1. ronv

    ronv Well-Known Member Most Helpful Member

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    Are you still using the hobby servo? Is the throttle return spring strong enough to return it to 0 when the servo is disabled?
     
  2. kinarfi

    kinarfi Well-Known Member

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    Yes, using hobby servo, yes, spring is strong enough, however, I have added a relay to cause the servo to drive to the home position.
    I got it finished today and took if for a ride and it works very well, it will even work without the vehicle being in gear, and that's something most cruise control can't do. It still needs some tweaking, it only goes to 40 KPH as set now, but that may be alright, for a while. It also needs more aggressive feed back from the tach side of the inputs, lost 5 KPH going up an incline, but overall, I AM VERY HAPPY with it.
    One of the strange things though is, I have several SMPS on my rig to drive LEDs lighting and any time I turn any of them on, the cruise control quits. I didn't leave the lights on to see if it would recover, that will happen another day.
    The reed switch came out of an old Sony telephone and operates at a little less than 5 volts and is used to input the correct voltage to the comparator to create a 2ms pulse which sends the servo to the home position and closed throttle and as it turned out, the correct voltage was very close to the servo operation voltage, so I just fed that in when the Run signal is gone.

    Happy, Happy, Joy, Joy,
    Kinarfi
     
    Last edited: May 10, 2012
  3. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    Uh, you got that backwards. What applies to women generally does not apply to electronics.

    Its your money, your funeral, and your Darwin award when yours goes Toyota on you right off a cliff! :p
     
  4. dave

    Dave New Member

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  5. kinarfi

    kinarfi Well-Known Member

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    Not being one to leave well enough alone, I revisited what Ronv suggested and redesigned and rebuilt my cruise control, again. Here's the .asc file and my drawing of it.
    Needed to go to a bigger wheel on the servo to get the RPMs up where I wanted them. Works good in the garage, test drive tomorrow.
    Kinarfi
     
    Last edited: May 15, 2012
  6. kinarfi

    kinarfi Well-Known Member

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    Update, works great, I can set the RPM to say 3000 RPMs and point it up the hill and let the clutch out and away I go, it droops a little under the load of a hill, but not nearly as much as a static hand throttle.
    Happy, happy, joy, joy,
    Kinarfi
    Work great for cruising down a road for long distances too.
     
    Last edited: Jun 4, 2012

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