MegaSquirt MAP Failure

[Brian L Massey]

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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