vr vs hall

[John Dammeyer]

We used latching hall sensors for our EFI.  There are magnets inserted into
an aluminum ring underneath the camshaft timing pulley.  On the Honda VTEC
the this is a stamped metal cogged belt pulley.  The magnet pairs are
oriented as a Gray Code encoder so with two HALL sensors a single edge
change occurs at every 90 CAM degrees.  My interrupt routine therefore gets
called on positive and negative edges and need only read the state of both
Hall Sensors to determine which quadrant the CAM is in.  No complicated
short tooth spaces or missing tooth calculations etc.  Because the sensors
come up indeterminate the engine does need as much as two revolutions to set
the magnets right.  An opto system would work better here but we didn't have
room underneath the pulley for any sort of vanes.

John Dammeyer

----- Original Message -----
From: <don.broadus at exeloncorp.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, February 08, 2001 2:45 PM
Subject: RE: vr vs hall


> Ed Lansinger had a similar problem with his teams SAE racer. He solved the
> problem by routing the mag pickup lines through inline coaxial capacitors
> soldered to the ECM case. The article appeared in 3 installments in
circuit
> cellar magazine issue #62/63/64 Sept/Oct/Nov This is the only Email I have
> for Ed is    lansie at rpi.edu.
>
>                                                                     Take
> Care
>
> Don
>
> > -----Original Message-----
> > From: Bruce Plecan [SMTP:nacelp at bright.net]
> > Sent: Thursday, February 08, 2001 4:11 PM
> > To: diy_efi at diy-efi.org
> > Subject: Re: vr vs hall
> >
> >
> > Without a whole lot more engine info., kinda hard to mention particular
> > bits.
> >
> > The reluctor types are an A/C generator so the have some built in
advance
> > that might be a problem (wayy too much advance at high rpm).
> > Halls on the other hand are fixed.   well, maybe a lil movement, but
> > basically where every the shutter is, that's the signal point
> > Bruce
> >
> >
> >
> >
> > > We''ve been having a tough time with noise on the triggering signal on
> > our
> > home
> > > build efi system for formula sae....we're now considering either a
hall
> > effect
> > > or variable reluctance setup directly on the crankshaft, and we're
very
> > space
> > > limited.  Does anyone have any comments on the two systems, and
perhaps
> > part #s?
> > > S. prince
> >
>
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>
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