coasting for the alternator? Rapid on/off for ICE? - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Go Back   Fuelly Forums > Fuel Talk > General Fuel Topics
Search Today's Posts Mark Forums Read Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 02-19-2007, 11:39 AM   #1
Registered Member
 
bzipitidoo's Avatar
 
Join Date: Jan 2007
Posts: 112
Country: United States
coasting for the alternator? Rapid on/off for ICE?

Saw this article today:

http://www.newscientisttech.com/arti...atch-could-imp

Claims that having the alternator charge only when it is efficient for the engine will increase FE by 2.6%.

Article also mentions:

fuel saving of 5% to 6% could be achieved if the car engine itself were to be rapidly switched on and off.
__________________

bzipitidoo is offline   Reply With Quote
Old 02-20-2007, 08:05 AM   #2
Registered Member
 
brucepick's Avatar
 
Join Date: Feb 2007
Posts: 722
Country: United States
Location: Connecticut
I can see this if it's integrated into the design of the vehicle and it's electronic control system.

OTOH, I drive an '89 Volvo which has elec. ignition and fuel injection. The car starts on 12V but when running it sees more like 13-14V. So I'd be very wary of disconnecting the alternator electrically, and forcing the car to operate on only 12V.

Plus the battery's reserve life is only something like 30-60 minutes; when you allow the needed time to recharge the battery for the next start that doesn't leave much time to run without the alt.
__________________

__________________
Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.

Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.
brucepick is offline   Reply With Quote
Old 02-20-2007, 03:00 PM   #3
Team GasMisers5!
 
landspeed's Avatar
 
Join Date: Nov 2006
Posts: 440
Country: United States
One way to replace the alternator would be to use NiMH batteries. You can get large form-factor ones at 1.2V each, and put enought together to give 13.2V or 14.4V. You could have a switch on the dash which either:
(1) Runs the alternator together with the normal car battery
(2) OR disconnectes the alternator and runs off the NiMHs.

The NiMHs could be charged at home and would give a period of time without using the alternator, especially on short journeys. The challenge would be to get the most out of the batteries by reducing electrical load e.g. higher efficiency fuel pump, LED lighting inside the car + maybe tail lights, HID headlights at night, etc
__________________

Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 (0 kWh used)
Hypomiler
landspeed is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
More SMS Requests zbret Fuelly Web Support and Community News 16 02-03-2011 01:09 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:33 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.