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
Self-driving vehicle technology could grow rapidly over the next two decades, with nearly 95 million “autonomous-capable” cars being sold annually around the world by 2035, a new study predicts.
MIT’s Senseable City Lab recently announced the program’s next big project: “Local Warming.” The concept involves saving on energy by heating the occupants within a room, not the room itself.
The fun factor continues to draw developers to Linux. This open-source system continues to succeed in the market and in the hearts and minds of developers. Design News will delve into this territory with next week's Continuing Education Class titled, “Introduction to Linux Device Drivers.”
Dean Kamen tells an audience at MD&M East 2014 how his team created the DEKA Arm to meet DARPA's challenge to design a better prosthetic arm for wounded veterans.
The new draw-it-on-a-napkin is the CAD program. As CAD programs become more ubiquitous and easier to use, they have replaced 2D sketching for early concepting.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 4 - 8, Introduction to Linux Device Drivers
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


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.
Next Class: August 12 - 14
Sponsored by igus
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service