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Thread: Vehicle speed converter

  1. #1
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    Vehicle speed converter

    Hi..

    i want to design a vehicle speed converter for car which takes speed signal from ECU of car and convert it to digital format. i don't have car. i don't know what kind of speed signal come out from the ECU of car. I am an Electrical and Electronic engineer. i have experience developing electronic circuit. I want to know the voltage VS speed waveform diagram of the ECU speed out put. Can anybody help me?

  2. #2
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    Bugbyte's Avatar
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    Any idea what car or ECU model you are designing for? This would probably help people answer your question.
    Quote Originally Posted by ghettocruzer View Post
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    Dear Bugbyte,

    Thank you for your reply.

    Proton, Isuzu cars. is different car use different technologies? I have no idea ECU models.

    Thanks again

    kirupa

  4. #4
    Raw Wave
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    Frequency to voltage is easy enough (LM2907/LM2917), and many speed transducers are pulse types - eg Nissans use a 10 pole sensor on the box (20 pulses per cable rev?) and they can be fitted to (older) Isuzus.

    Isuzu often use a reed switch mounted in the speedo (I'm not kidding - and it lasts for hundreds of thousands of miles/km!).


    As to digital....

  5. #5
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    Dear OldSpar,

    Thank you for your reply.

    I didn't get answer for my question. i want to know what kind of speed signal come out from the ECU of car?

    1) is this pulse? ( different speed has different frequency)
    2) is this linear voltage? ( different speed has different voltage)


    Thanks

  6. #6
    Constant Bitrate
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    Hmmmmmmmmmmm....we don't have Protons stateside. Perhaps you can get a pic of one so we can figure out the corresponding model and go from there?

  7. #7
    Raw Wave
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    Quote Originally Posted by kirupa View Post
    I didn't get answer for my question. i want to know what kind of speed signal come out from the ECU of car?
    Which ECU?


    Normally they don't come out of the ECU unless there is a need - and that could be as anything (eg, analog proportional; though usually pulse, coded (binary etc), or discrete/command level (threshholds).

  8. #8
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    Hi..

    Thank you for your reply.

    Say, now vehicle is moving 20Km/h. i am connecting a oscilloscope to ECU speed output? How will the oscilloscope waveform be? Now i am changing speed to 40Km/h. Now how will the oscilloscope waveform be ?

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    It is VERY unlikely that you will be able to design this without having access to the car. Why are you developing this for a car you neither own nor have access to? Is this a commercial project?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  10. #10
    Raw Wave
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    Ditto. Again which ECU?

    Or answer this:
    How will:
    - an analog voltage
    - a bitsream (hex or binary or BCD)
    - PWM or...
    - variable frequency pulses
    look on your CRO?

    Are you using DC or AC input?

    Answer the above (at least 4 answers; 8 if AC/DC variation; extra if hex is different to binary)
    ... and I'll continue.


    Also, which Isuzu ECU puts out a speed signal?

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