HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Walt
User Rank
Gold
Longevity Issues
Walt   1/3/2012 12:13:14 PM
NO RATINGS

For a fuel savings of only 3~5% - and then only in city driving – I'd hate to add the longevity and reliability issues likely to occur:


Stopping an ICE generally causes a short-term, but fast and significant increase in case temperature.  The only prevention of this is to continue the flow of coolant through the engine, plus the radiator fan in many cases.  Now the electrical system must support the coolant pump at every stop.  It must also ensure that over-cooling does not occur to reduce temperature changes, which shorten the life of the internals of the ICE.


I'd also be surprised if even an improved starter and flywheel could put up with engine starts at every stop without significantly reducing the lifespan.  It seems this should be accomplished via the power train.  This would only be feasible in a hybrid electric or starting from each stopped position would include the delay of the initial stabilization of the ICE after startup.

For a person that expects 200K~300K miles of good service from a vehicle, these look like shaky configurations for this small level of fuel efficiency.

 

Jerry dycus
User Rank
Gold
Not new
Jerry dycus   1/3/2012 9:34:36 AM
NO RATINGS
 

           This tech isn't new as it's been done for over 50 yrs, just rarely in cars because gas was so cheap.  Many used the old DynaStart generator/starter unit back in the 40's.

          I fail to see why instead all cars don't have the flywheel as the starter/alt that can also be used for regen/braking and acceleration boost at little extra cost if any.  By joining the 3 saves copper, alum casings, pulleys, belts and their losses, etc,

             And savings from a smaller engine could make it even cost less while cutting fuel use 15-20%.



Partner Zone
Latest Analysis
The National Aeronautics and Space Administration’s recently announced plan to put an electric airplane in the air by 2018 is forward-looking, but hardly unique.
Engineers can channel the eye of the tiger and rise to the challenge, with a number of prize or award-giving contests out there to test your metal and intellectual prowess.
Engineers at the Lawrence Livermore National Laboratory have achieved the ability to scale nanotechnology for the development of super-strong, lightweight metal materials.
Harvard researchers have identified a new class of high-performing organic molecules in the development of redox flow batteries for alternative-energy storage.
Researchers in the United Kingdom have found a sustainable way to derive hydrogen from grass to develop biofuel.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 11 - 15, Embedded System Design Techniques™ - Debugging Real-time Embedded Software – Hands on
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service