electronic differerential

Discussion in 'General Electronics Chat' started by Victor Robinson, Feb 1, 2015.

  1. Victor Robinson

    Thread Starter New Member

    Feb 1, 2015
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    Hey Everyone
    Just found your website while looking at "Picprojects" home page.
    I want to build an "electronic differential " that I can use to control my "ride on" buggy.
    The differential would have the effect of slowing down the "inside wheel" when cornering , (left/right) keeping the present "twist grip accelerator" to control the speed.
    Each rear drive wheel has a motor 12vdc and a power drive unit. Battery Voltage =24vdc.
    Each drive unit consists of two on board MOSFETS switched by a 12f683 pic device. A 10k potentiometer is used to regulate the pulses to the gates of the Mosfets.
    I would appreciate any idea's as to how I can achieve this idea.
    Many Thanks
    gasper1939
     
  2. crutschow

    Expert

    Mar 14, 2008
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    How does the "twist grip accelerator" control the speed now? Is that the 10k pots?
     
  3. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,678
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    You should be able to monitor the torque and RPM of each wheel, and program the equivalent of a limited slip differential.
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,011
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    Is this to help with steering or generate the steering?
     
  5. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    .
    Good idea, and maybe you could accomplish that by monitoring the power drained by each wheel.
     
  6. Victor Robinson

    Thread Starter New Member

    Feb 1, 2015
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    Thanks for the post. At present , both motors are driven in parallel from the same "power pack" . The twist grip (similar to a motorbike accelerator ) is used to control the speed.
    The unit has a "soft start" incorporated in the code, giving a smooth ramp up to full speed.
    Hope this helps
    Gasper1939
     
  7. Victor Robinson

    Thread Starter New Member

    Feb 1, 2015
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    I have no way of monitoring the RPM at the moment, but I can see where you are at , so by sensing the the current rise on the "inside" wheel , the "outside wheel could be made to speed up , the overall speed being regulated by the twist grip accelerator . Is that what your saying ?
     
  8. Victor Robinson

    Thread Starter New Member

    Feb 1, 2015
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    Just to help the steering and to make the cart more stable when cornering .
    Thanks
    gasper1939
     
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