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Car Immobilizer problem

Discussion in 'General Electronics Discussion' started by amidis86, Jul 17, 2012.

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  1. amidis86

    amidis86

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    Jul 17, 2012
    Hello, i just follow simple circuit to make car ignition cut off, in this circuit when button press, relay will give signal to second relay, and the second relay will self hold. But the problem is, when i start car ignition switch, the self hold relay terminated.

    [​IMG]

    So i replace self hold relay supply with direct battery, the problem is i need to add some switch to cut the hold relay. Anyone have circuit that off delay switch will so i can apply to cut off the direct supply line?
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    The relay type(s) would benefit greatly...
     
  3. amidis86

    amidis86

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    Jul 17, 2012
    The relay type is Coil,12VDC DCDT double contact double terminal.
     
  4. mechtronics

    mechtronics

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    Aug 7, 2011
    which relay do u want to decouple the 12 volt supply relay or the other one? and do u want to do this automatically? after a certain time?
     
    Last edited: Jul 17, 2012
  5. amidis86

    amidis86

    47
    0
    Jul 17, 2012
    Here is my idea :

    [​IMG]

    Ok here the process:

    When i press the switch(This will be my ignition switch), first relay on top will on, and then second relay on bottom will self hold.(This self hold relay will be connect ignition coil wire)


    But when i put ignition switch to start, the self hold relay that hold ignition coil line automatically lose power and not hold any more.

    Then i replace self hold relay supply with direct 12vdc from car battery, but i need to put some switch to reset the self hold relay. What i want is i dont want to use reset switch, i want the self hold relay automatically reset when i switch off the ignition switch
     
  6. mechtronics

    mechtronics

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    Aug 7, 2011
    so while you have the ignition switch on the self hold relay will hold. and you want to break the circuit to turn off the self hold relay while you still have the ignition switch active?
     
  7. mechtronics

    mechtronics

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    Aug 7, 2011
    i may have an idea that involves another 4 pin relay and a 555 timer circuit that might be able to be added to it. i will put up a block diagram and show you if you want?
     
    Last edited: Jul 17, 2012
  8. amidis86

    amidis86

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    Jul 17, 2012
    Yes please,i want it. i can try it, any possible circuit will be so thankful :)
     
  9. mechtronics

    mechtronics

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    Aug 7, 2011
    is your ignition switch just going to be on for a few seconds or what? according to the diagram it has to be contantly on?
     
    Last edited: Jul 17, 2012
  10. amidis86

    amidis86

    47
    0
    Jul 17, 2012
    I'm sorry, my bad explanation, here the full description on my project.

    1. Ignition switch pull to ON position, RFID System ON, engine cannot start

    2. The switch on picture will be rfid scan signal,, when i scan rfid card, 12v will be supplied to top relay, and automatically bottom relay will self hold. <--bottom relay hold using direct battery

    3. After bottom relay self hold, i able to pull ignition switch to START position. engine start. If i switch OFF ignition switch engine stop, but the hold relay not reset until i disconnect the supply.

    Any suggestion how to make the hold relay reset automatically when i switch off ignition switch without using switch?
     
  11. amidis86

    amidis86

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    Jul 17, 2012
    [​IMG]
     
  12. mechtronics

    mechtronics

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    2
    Aug 7, 2011
    how will the relay be able to self hold when u pull up the ignition switch that cant be possible. it will disconnect anyway
     
  13. amidis86

    amidis86

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    Jul 17, 2012
    Can Timer 555 use as, when got supply the timer is ZERO, but when no supply, it hold a relay 15-30second then de-active the relay?
     
  14. mechtronics

    mechtronics

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    Aug 7, 2011
    what i mean is when u scan rfid this switch will have to be contantly on to keep battery supply going through the relays.
     
  15. mechtronics

    mechtronics

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    2
    Aug 7, 2011
    in your diagram is your ignition switch in the top left corner the same as the one u have pointed out going to the battery??
     
  16. amidis86

    amidis86

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    Jul 17, 2012
    Oh God im sorry, i will repair that..
     
  17. mechtronics

    mechtronics

    153
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    Aug 7, 2011
    no bother
     
  18. amidis86

    amidis86

    47
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    Jul 17, 2012
    [​IMG]

    Here i go ;)
     
  19. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    ??????
     

    Attached Files:

  20. amidis86

    amidis86

    47
    0
    Jul 17, 2012
    Yes, the connection is same, or maybe there have any solution that you like to suggest?
     
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