Tue, 31 Aug 1999 13:29:30 +0300 - Message No. 6300
From: Phoebus

Subject: Possi's spritmesser modified and seems to work fine.


Hi there.
Some time ago I wrote, asking for help translating a guy's patent that
calculated consumption.
The thinking behind the idea was that if you know how much fuel you have
(23lt full tank, 5lt reserve), you know how much is remaining inside
your tank, with more accuracy from calculating by the tripmaster, since
the consumption can vary heavily according to driving style.

There are small digital meters that measure speed for bicycles.
You tell them how long it travels with one full turn of the wheel, put a
little magnet on the wheel, and it has a sensor that closes a circuit
every time the wheel turns once, and this little thing makes the
calculations to measure speed, trip distance etc.

Now what I did was to connect it to the fuel pump like this:
FuelPump->Diode->relais->Diode->cables->"digital trip meter"

So what now hapens is that each time the pump pumps fuel once, the
relais causes the cables of the digital trip meter to close the circuit
and the trip meter things it has a full wheel turn.
I have set it up to caclulate 223cm for each turn, so it shows me the
fuel that has been consumed. 
Actually it shows 10 km when 1 liter is gone.
So far no problems after about 300 km, and in 3 consecutive gass fills
it seems to work preety good and to be preety accurate, but I am stiil
checking.
A small problem seems that my pump doesn't stop when after full speed i
stop, but I only have one relais (towards the battery), and I think if I
put a second one as shown above this will stop.

Any1 interested?



www@atic.org