Bob,

thanks now I understand. I was right about x4 deal but since I didn't know=
=20
it was divided by 2 so my info was wrong too.

thanks

Andre




________________________________
From: Bob Blick <bobblick@ftml.net>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sent: Mon, March 7, 2011 9:38:10 AM
Subject: Re: [EE]: VW engine RPM question

On Mon, 07 Mar 2011 09:14 -0800, "Andre Abelian" wrote:
> Hi to all,
>=20
> There is some  thing I do not clearly understand about VW battle engine.
> the=20
> rotor has 4 magnets on it and the board has
> 1 hall effect sensor with none latch version so each magnet will control
> each=20
> cylinder.  lets say 8000 engine RPM
> I divide by 60 to get the frequency 8000/60=3D133.33 since 4 pulses is on=
e=20
> revolution x4 I get 533.33.=20
> I have been told 133.33 is my frequency but the way I calculate 133.33 is
> each=20
> cylinder not looking at the hall sensor.
> it sounds like 133.33x4 should be 533.33 not 133.33 since 1 revolution is
> 4=20
> pulses?=20
> my question is witch one is correct 133.33 or 533.33
> my understanding is it should be 533.33


Hi Andre,

Neither is correct.

The rotor spins at half the engine speed, at 8000 rpm the rotor is
spinning 4000 rpm. With four lobes that is 16000 sparks per minute or
266.66 Hz.

Cheerful regards,

Bob

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