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PICList Thread
'[PIC]: Truck tachometer'
2000\06\01@110224 by Octavio Nogueira

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face
> >Picking up the ignition pulse is more exact.
>
> Most trucks are diesel and don't have one of these. Perhaps this is why he
is
> looking at the alternator?
>
> My idea would be to have some form of sensor mounted to sense the teeth on
the
> starter ring gear. This would probably give a more consistent pulse pickup
then
> alternator frequency.

What about picking the fuel injector pulse? I was
thinking in applying this to measure RPM and fuel
consume.
to measure the width of the pulse I will use CCP

Friendly Regards

Octavio Nogueira
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{Original Message removed}

2000\06\01@110847 by Alan B Pearce

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>What about picking the fuel injector pulse? I was
>thinking in applying this to measure RPM and fuel
>consume.
>to measure the width of the pulse I will use CCP

probably easier to get at than the starter ring gear. Also kills two birds with
one stone, if you are needing fuel consumption data. I do not know how accurate
it would be, put probably accurate enough.

2000\06\01@122155 by Dale Shelor

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>
>What about picking the fuel injector pulse? I was
>thinking in applying this to measure RPM and fuel
>consume.

If it is a Diesel it's probably mechanical injected.  Only the lastest
diesel trucks have electroniclly controlled injection.  It may be possible
to read the mechanical injection pulses with a load cell on one of the
injection lines.  If it is a newer electroniclly controlled diesel then you
can probably find the RPM as serial data from the engine fuel computer.
The new Volvo trucks have a Motorola 68HC11 in the dash just to control the
gauges.  It appears a lot of info (RPM, speed, temp, oil pressure) is sent
as signal serial data stream to the dash. (But they still run hoses all the
way to the dash and have mechanical air pressure gauges!)

For low RPM engines (like diesel trucks) the alternator is not real bad
source for RPM.  Oldsmobile did it for years on their diesel cars. (not
saying that Oldsmobile did anything right with a diesel car! 0-60 in 32
seconds, those were the days...)

Dale

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