[Diy_efi] 60-2 crank sensor algorythms - Detecting missing pu

[Gerald Gnitter]

Sorry to barge in.

I will be working on an application with a 58/60 tooth
system (such as the one you are describing) and am
curious where the first (or last) tooth would be in
reference to TDC for Cylinder #1?  

Is there a standard that anyone is aware of, or is
this manufacturer dependant?

The application is a 50 degree V-Twin motorcycle
engine.

Thank you!

GG


--- Sid.Young at qml.com.au wrote:
> 
> Markus,
> 
> I am working on an algorithm at present that says if
> the timer elapsed is >
> 1 3/4 of the last time it is the missing tooth.
> 
> Does this sound feasable to you ?
> 
> 
> Sid Young
> Brisbane
> Australia
> 
> 
> 
> -----Original Message-----
> From: maier_markus at t-online.de
> [mailto:maier_markus at t-online.de]
> Sent: Thursday, 3 April 2003 9:08 PM
> To: Brian at lightprocessor.co.uk; List for general
> do-it-yourself EFI talk
> Subject: Re: [Diy_efi] 60-2 crank sensor algorythms
> 
> 
> Hi,
> 
> the algorithm is quite straight foward:
> 
> at every positive flange of the tooth, you get
> interrupted (by the uC
> pin input). Then you're determining the time for
> that tooth (by a timer
> or whatever is appropriate on your micro) and store
> the result in an
> array (with the size of three). Before storing it,
> you need to shift
> the current array contents by one.
> 
> The algorithm then to detrmine, if the missing teeth
> have been passed
> is very easy:
> 
> your array contains the times for the last three
> theeth t1, t2, t3
> 
> if t2 > t1 + t3 then the missing teeth is the
> overlast one, which is
> ok.
> if t1 > t2 + t3 then the gap was detected one tooth
> to early and you
> can run a compensation algorithm
> if t3 > t1 + t2 then the gap is detected one tooth
> too late and you can
> run another compensation algo.
> 
> Once you detected the gap, you can reset your main
> timer (that
> represents the crank angle) to zero and reload the
> timers, that control
> the inginition and injection pulses.
> 
> I have to admit, that I'm working with Infineons
> TriCore, that has
> plenty of hardware timers linked to each other,
> which makes things
> easier. But implementing that in software is also
> not a big deal.
> 
> Ciao
> Markus
> 
> 
> 
> Brian Sidebotham schrieb:
> > Hi all,
> > 
> >  I'm currently worked on a few bits that require
> me to
> > work with a 
> > bosch 60-2 crank angle sensor. Now the EFI332
> project
> > uses the 
> > TPU section of the processor which looks like a
> fine
> > idea, but the 
> > code does not seem to be available from the site
> anymore
> > :(
> > 
> >  Anyway, I am using a different make of processor,
> and I
> > would like 
> > to get crank angle information without the need
> for a
> > TPU, but 
> > using standard timers, and external interrupts,
> etc.
> > 
> >  I wouldn't even mind doing a dedicated processor
> that
> > finds the 
> > two missing teeth, and outputs them so that they
> could
> > cause an 
> > interrupt on my main processor, and the CAS signal
> can be
> > 
> > connected to a timer input on my main processor to
> keep
> > track of 
> > engine angle.
> > 
> >  What has everyone else done?
> > 
> > Cheers, Brian Sidebotham.
> > 
> > 
> > _______________________________________________
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> >
> 
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