Captain Hybrid

Slideshow: Fuel-Stingy Technologies Set Sights on 54.5 MPG

View Comments: Oldest First|Newest First|Threaded View
<<  <  Page 10/10
William K.
User Rank
Re: Fuel economy, 36 volt systems?
William K.   10/10/2013 3:09:22 PM
In reality a higher battery voltage will mean a larger alternator and a greater alternator load. The reason for the higher voltage is to provide enough electrical power for all of the loads. The higher voltage was never to reduce the weight of the wires. The first suggestion s for the 36 volt system, (42 volts) was to power the electrically heated catalytic converter. The concept was to delay the start while bringing the catalyst up to operating temperature using electrical heat.  The power consumed was about the same as for cranking the engine for several minutes. The good news is that the idea was so very stupid that it was never released. What could be useful for the stop-start driving method would be a 24 volt alternator/starter unit, such as the Continental one pictured in the slideshow.

What stands in the way of the effective impplementation of the ultimate stop-start system is engine driven power steering, and air conditioning demands. Right now, I can shift my car into neutral and coast to a light, but it will not drop below 1500RPM until the vehicle is stopped. That is to assure power steering bost while still moving.

With most cars now being much lighter than when power steering first became popular, it seems that we should go back to the non-powered type of steering systems. They were not that hard to turn, and they were both less expensive and more reliable. And if we got rid of some drivers, so much the better. Fewer drivers, les crowded roads.

User Rank
Aluminum wiring-bad idea!
armorris   1/9/2014 9:59:35 AM
Referring to slide #7, aluminum wiring. That's a very bad idea. While aluminum may be lighter than copper, aluminum oxidizes far more easily than copper, causing faulty electrical connections. It was used in houses for a while, but caused many fires and has since been discontinued. Now add to that, the temperature and humidity of an automotive application, I predict that the reliability will be extremely low. Bad idea!

User Rank
36 or 42 volt battery voltage
armorris   1/9/2014 11:03:17 AM
A big problem with a high battery voltage like 36 or 42 volts is that the various incandescent lamps in the vehicle will have longer, thinner, more fragile filaments. This would greatly reduce their reliability. While everything is moving toward LEDs, switch-mode power converters will be needed to adapt LEDs to such a high voltage. This would cause weight, cost and reliability issues. Of course, even at 12 volts, higher powered LEDs would require switch-mode power converters to avoid energy loss. The size and cost of the components in a switch-mode power converter are affected by the wattage, not the battery voltage.

User Rank
Re: Fuel economy, 36 volt systems?
armorris   1/9/2014 12:17:52 PM
The military uses 28 volts on aircraft. I know because I spent most of my career designing automatic test tquipment for aircraft and missile electronics. I imagine the military uses 24 volts in vehicles. I have no experience with that.

User Rank
Re: Aluminum wiring-bad idea!
kwcclark   9/5/2014 10:48:52 AM
An even "better" idea for lightweight wiring is Sodium.  High conductivity, light weight.  Amazingly, it is trying to make a comeback (www.sodiumwire.com).  Just remember, don't let it get wet, and never, ever, feed it after midnight.


<<  <  Page 10/10
Partner Zone
More Blogs from Captain Hybrid
Fiat-Chrysler Automobiles CEO Sergio Marchionne has again committed the colossal sin of speaking plainly, and electric vehicle advocates aren’t happy about it.
Electric vehicle batteries are progressing rapidly, but there’s still no sign on the horizon that the technology is going to revolutionize the auto industry anytime soon, experts said at The Battery Show in Detroit last week.
An engineering team from Ohio State University has set its sights on the unimaginable -- driving 400 mph in an electric vehicle.
We’ve collected photos of electric cars, designed for both the neighborhood blacktop and the commercial dragstrip. From the Crazyhorse Pinto and the Killacycle motorcycle to the Tesla Roadster and the 500-HP Renovo Coupe, we offer a peek at the blistering performance of the electric powertrain.
Tesla Motors might be planning to boost the driving range of its two-seat Roadster to 400 miles.
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Nov 3 - 7, Engineering Principles behind Advanced User Interface Technologies
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: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
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