Accurate Fuel Flow Measurement for Mileage Calculation

Flowmeters are normally expensive and require some good electronics to work fine.

Have you considered using some EFI frequency signal and fuel manifold pressure to calculate the fuel flow?

If flow measurement is really necessary, cox instruments are the guys who supply most of the fuel flow measurement devices.

gentle man the fuel consumption is measured in grams/BHP/Hour and published as per relevent ISOs ltr/KM or mile is a unit employed by clever marketing lot.

crm

crm,

Of course litres/100Km and MPG are averages but it seems to me the car manufacturers would all use the same misleading testing and calculation methods to be competitive with each other.

Also it seems to me that the g/BHP/Hr would vary with RPM (I could be wrong) so that measure would also be subject to varying test conditions, wouldn't it?

Gordie

You are 100% Right, The test conditions are as per ISO Standards in force.as far fooling the ignorant customer is concerned the fuel consumption by vehicle manufacturers publish in Km/Lt or Miles/Litre's at Ideal Conditions or Test conditions at Factory tracks .even god doesn't know what does the statement mean. Then you have manufacturers of gadgets to enhance fuel consumptions legally picking the pockets of educated end users!

I read somewhere that for really accurate real-time flow rate measurements that sound pulses were passed through the fluid in both directions and the difference in the time delays or Doppler shifts were used to calculate the flow rate.

For a cheaper solution you could use mass flow measurement. (wind chill) You pass a fairly substantial current through an RTD and measure the temperature to see how fast the fluid is taking the heat away. All you need to know is the thermal conductivity, thermal capacity (specific heat?) and temperature of the fluid. These should be known, known and measurable for your fuel.

And one final word: Injection. (If the engine is injected you should know how much fuel is injected per cycle. Just count them.)

Gordie.

Hi on my boat i use a device which tracks my fuel consumption made by Flowscan. Hope this helps.

Try Flow Scan (or is it Floscan?)

They make fuel metering equipment.

Travis

on a fuel injected car you will need to meters. One on the fuel to the rail and one on the return fuel, then subtract to get use. Here is one. Look up fuel meters used on small planes or jets.

http://www.directindustry.com/prod/hoffer-flow-controls/micro-turbine-flow-meter-for-liquids-9075-58353.html

See http://www.scangauge.com/ I have bought a scangauge to test fuel milage increasing devices. It's showing a decrease so far, but I am still testing. I question the scangauges accuracy, as I did a test the old fasoned way and had opposite results. Unforunantly I have to do hours of more driving to figure out whats going on. If you discover any malfuntions with the scangauge, please let me know.

I guess the question here is how is the car measuring the fuel rate? Because as far as I can tell from their web page the ScanGuage is just reading ODB info from the car.

If the car has an accurate flow meter then ananyinnov can just go down to his local auto parts store and pick one up.

Gordie

The way that ScanGuage works is by using Distance value from the ODB-II serial data stream and then dividing by the Mass Air Flow value from the ODB-II serial data stream and assuming stoichiometric combustion (not really true but probably close enough) to get the petrol consumed with the appropriate scaling factors to get the desired units. They can do some averaging to smooth the signal out as well as integrating the values to give overall rates as well as the instantaneous values.

If you are a bit more adventuresome slinging electrons, here is a link for DIY monitor:

www.windmill.co.uk/obdii.pdf

Cheers !!

Hi, Bell Flow Systems do Fuel Consumption Flow Meters which are accurate. http://www.bellflowsystems.co.uk/fuel-oil-flow-meters/engine-fuel-consumption-flow-meter-range/

Cheers

Hi,

This is Md Fazle Rehman from OCL India Ltd., in technology division.

We are also trying to develope same, till yet i have concluded to have two flowmeters:-

1- 1st at fuel outlet pipe.

2- 2nd at fuel returnflow pipe.

then both the data recorded by the GPS system and will be calculated.

But the bottleneck which i am facing is to have the flowmeter of that size with accuracy measurement.

If you do get any idea or resource for it then please do contact me at mdfazlerahman@ocl.in

Hi All, I am interested in finding the solutions to the said forum. Anyone with an accurate solutions to this? Please advice. Thanks & Regards, Darren