DIY_EFI Digest V5 #848

[Bruce Bowling]

What I am doing in my car which I am driving with MegaSquirt is to keep a 
spare MegaSquirt


>------------------------------
>
>Date: Sat, 27 Oct 2001 09:33:25 -0700
>From: Brian L Massey <blocklm at juno.com>
>Subject: Re: MegaSquirt MAP Failure
>
>On Thu, 25 Oct 2001 13:02:36 -0400 Al Grippo <grippo at jlab.org> writes:
> > If you lose MAP, the car will be totally
> > undriveable. But if you
> > wish, you can code a backup fuel enrichment based on tps and
> > similarly you could get
> > your accel enrichment from the change in MAP. The hard part is
> > deciding when you have
> > lost a sensor.
>
>Here's an idea we use in critical controls. (this might work especially
>well if the MAP sensor is small and onboard). Put 3 sensors onboard, and
>let them vote in the code. If one is out-of-range, the other two will
>override. Flag that sensor as needing replacement.
>
>Having said that, it seems the reality of the situation is that the
>controller itself is probably as likely to fail as that single sensor
>(the Motorola sensors are not mechanical, but just another 'chip', so
>they probably aren't much different rel than any other 'chip' onboard),
>and then you're faced with the same showstopper. There's only so much you
>can do without redundancy in the controller itself, and that's a whole
>lot more complex ballgame, believe me!
>
>Brian
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- Bruce

---------------------------------------------
              Bruce A. Bowling
          bbowling at earthlink.net
    http://home.earthlink.net/~bbowling
---------------------------------------------

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