Go Back   EcoModder Forum > EcoModding > Instrumentation
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-08-2013, 01:35 PM   #171 (permalink)
EcoModding Lurker
 
mozul's Avatar
 
Join Date: Apr 2012
Location: Lomita, CA, USA
Posts: 37

Spitfire - '68 Triumph Spitfire Mk II
90 day: 26.18 mpg (US)

CivicHybrid - '04 Honda Civic Hybrid
90 day: 37.1 mpg (US)
Thanks: 5
Thanked 4 Times in 4 Posts
I have two flow meters only because the eBay auction was for two. I will only install one of them. There is no fuel return line. It just flows into the carb, gets burned up by the engine and pushes me down the road.

Perhaps I can make a second MPGuino with my other flow sensor for my motorcycle.

__________________

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-08-2013, 01:42 PM   #172 (permalink)
Master EcoModder
 
AndrzejM's Avatar
 
Join Date: Oct 2011
Location: Poland
Posts: 840

Berta - '97 BMW 318 tds Compact
90 day: 62.03 mpg (US)

Charlie - '07 Citroen C4 Grand Picasso Exclusive
90 day: 37.58 mpg (US)

Corsa - '05 Opel Corsa C
90 day: 53.22 mpg (US)

Mruczek - '03 Audi A2
90 day: 60.61 mpg (US)
Thanks: 185
Thanked 167 Times in 117 Posts
For one flow meter the setup is much simpler. You count time between pulses for instant FE reading, and count pulses to have total amount of used fuel. Of course you have to combine that with a reading from VSS sensor.
__________________


Quote:
Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
  Reply With Quote
Old 04-10-2013, 08:31 AM   #173 (permalink)
EcoModding Lurker
 
Join Date: Apr 2013
Location: NC
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Did anyone come up with anything

Hi
I have a 1975 GMC Moterhome. I am in desperate need of something to get MPG. O ya, I am poor. lol I found flow meter as log as $140 but nothing to read them unless I want to put in a fish finder. Did anyone put a project together?
  Reply With Quote
Old 04-16-2013, 09:59 PM   #174 (permalink)
MP$
 
diesel_john's Avatar
 
Join Date: Jan 2008
Location: SW Ohio
Posts: 595
Thanks: 5
Thanked 19 Times in 14 Posts
Send a message via MSN to diesel_john
sensitivity of the flow meter

one note: most low cost flow meters are not sensitive enough to accurately measure the small amount of fuel flow that an automotive engine uses at low power settings. A VW diesel for example uses 1 gallon per hour @ 50MPH. 128ounces/ 60 min.= 2.13 ounces per minute. Most flow meters can bypass that much without even measuring it. IMHO it would require very tight tolerances in positive displacement flow meter to that measure small flow. They exist it is just they are more expensive.
  Reply With Quote
Old 04-17-2013, 12:29 PM   #175 (permalink)
EcoModding Lurker
 
mozul's Avatar
 
Join Date: Apr 2012
Location: Lomita, CA, USA
Posts: 37

Spitfire - '68 Triumph Spitfire Mk II
90 day: 26.18 mpg (US)

CivicHybrid - '04 Honda Civic Hybrid
90 day: 37.1 mpg (US)
Thanks: 5
Thanked 4 Times in 4 Posts
I have ordered the rest of the parts for my MPGuino. Once they come, Ill be able to make it read my flow meter. I can run a gallon of water through it and count the pulses. My flow meter is designed for fuel. It is for a boat to measure the gallons per hour that they use. Ill see how reliable it is. For a different vehicle example, my ultra gauge measures about 0.5 gallons per hour at idle for my Jeep Liberty.
__________________

  Reply With Quote
Old 04-18-2013, 02:33 PM   #176 (permalink)
Master EcoModder
 
P-hack's Avatar
 
Join Date: Oct 2012
Location: USA
Posts: 1,408

awesomer - '04 Toyota prius
Thanks: 102
Thanked 252 Times in 204 Posts
unsolicited thought:
by counting pulses, the sensor is inaccurate at slow speeds. Perhaps even a little off over the whole range.

If the timing changes of the pulses are considered, perhaps one could calibrate it and get more useable range and more accuracy from the sensor by using the pulse timing to look up calibrated values.

Or the sensor just stops turning at that slow of a speed.

After that the next gain in accuracy would be had trying to consider the acceleration of the rotor.
  Reply With Quote
Old 04-26-2013, 09:34 AM   #177 (permalink)
EcoModding Lurker
 
Join Date: May 2011
Location: Southern Skies Australia
Posts: 49
Thanks: 6
Thanked 8 Times in 7 Posts
Greetings Gentlemen
I have been thinking about a suitable solution for flow sensors on & off for some time .
I have tested various types of flow sensors & as Diesel John mentions a few posts back ,low flow reliability comes at a cost ,I have been trying to locate a used flow scan sensor (model 264)that was used on a GM cars here in the 80's (apparently it was accurate) to see how it was made.

Here is another thought ,as the mpguino measure injector pulses(pwm) ,has any body thought about simulating the injector pulse train ?
This could be referenced from the ignition pulse ,perhaps along with a gm map sensor to vary the pulse length.
It wouldn't actually measure fuel flow but may be close enough (at cruise only) for real time comparison mpg's.
I have been testing this circuit for a few tanks now ,it is only referenced to the ignition pulses at the moment ,I don't have enough time to take this further .It may be worth further thought/development.

Tp
  Reply With Quote
Old 04-26-2013, 08:41 PM   #178 (permalink)
Master EcoModder
 
P-hack's Avatar
 
Join Date: Oct 2012
Location: USA
Posts: 1,408

awesomer - '04 Toyota prius
Thanks: 102
Thanked 252 Times in 204 Posts
I was looking at ultrasonic flow meters, and it seems likely that the sensor itself can be made with just a couple of piezos, that measure time of flight in one direction and then the other and gauge flow rate that way, it may need it's own cpu (at least for prototyping) to send and process the signals, but it might be the path forward for good range, accuracy, and reliability, and very low cost, ease of manufacture, and compatibility with lots of fluids. Don't know if it has been considered yet. My bike is the only non-efi left so I'm not real gung ho about it, just thinking about it.



Ultrasonic flow meter - Wikipedia, the free encyclopedia

Last edited by P-hack; 04-26-2013 at 08:49 PM..
  Reply With Quote
Old 04-26-2013, 08:49 PM   #179 (permalink)
Master EcoModder
 
P-hack's Avatar
 
Join Date: Oct 2012
Location: USA
Posts: 1,408

awesomer - '04 Toyota prius
Thanks: 102
Thanked 252 Times in 204 Posts
though I think if you arrange the piezos like this, it wont take so many maths to figure out the flow, and enhance sensitivity and range.


Or not, would take more transmit power perhaps. Having the sound in parallel with the flow doesn't take any trig and provides maximum difference between signal timings for each direction, and having a longer sonic path should increase the travel time of the signal through the fluid and thus the resolution of the signal.
Attached Thumbnails
Click image for larger version

Name:	Untitled.png
Views:	118
Size:	6.7 KB
ID:	12973  

Last edited by P-hack; 04-26-2013 at 09:06 PM..
  Reply With Quote
Old 04-26-2013, 09:34 PM   #180 (permalink)
Master EcoModder
 
P-hack's Avatar
 
Join Date: Oct 2012
Location: USA
Posts: 1,408

awesomer - '04 Toyota prius
Thanks: 102
Thanked 252 Times in 204 Posts
yah, 1/4" sensor within 1% accuracy from 2ml/minute to 3liters/min, made out of piezos and pipe (and processing power), definitely worth looking into.

http://content2.smcetech.com/pdf/LFU.pdf

that equates to 0.03 gph to 48 gph @ %1 accuracy?!?


Last edited by P-hack; 04-26-2013 at 09:40 PM..
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
EcoModding for Beginners: Getting great gas mileage. SVOboy EcoModding Central 55 08-20-2012 11:34 PM
Engine braking without using fuel idea Dane-ger EcoModding Central 38 02-04-2010 10:35 AM
In a world where Jeeps get horrible gas mileage.... EcoJeeper Introductions 16 03-26-2009 12:09 PM
Coasting experiment: engine on VS engine off on a fixed route = 12.9% gain MetroMPG Hypermiling / EcoDriver's Ed 6 02-22-2008 08:38 AM
Basic EcoDriving Techniques and Instrumentation SVOboy Instrumentation 2 11-17-2007 11:38 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com