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
A study by the Swiss government determined the type of human errors that lead to engineering disasters and ranked those errors by percentage.
General Motorsí growing commitment to electric cars took a new turn last week, as the giant automaker said it would use EV batteries in the future to help boost its use of renewable energy.
A fabric designer and chemical engineer have teamed up to design fabric woven with solar panels for the future of wearable, autonomously powered technology.
A new linear encoder will offer measurement resolution of about 31 picometers -- less than the diameter of an atom -- when it hits the market in prototype form later this year.
Apple made some controversial decisions with its new iPhone 7 models, so what did they do with the extra space? The latest teardown from iFixit digs under the hood of Apple's new sensor-heavy phone.
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.
Sep 12 - 16, Analytics for the IoT: A Deep Dive into Algorithms
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.
Next Course June 28-30:
Sponsored by Stratasys
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