HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Captain Hybrid
Start-Stop Micro Hybrids Gain Momentum
2/16/2012

Microhybrid technology will grow dramatically over the next five years and will appear in 39 million new vehicles sold worldwide in 2017, according to Lux. The firm breaks microhybrids down into light, medium, and heavy categories, depending upon the size of the vehicle and the presence of regenerative braking. 
(Source: Lux Research)
Microhybrid technology will grow dramatically over the next five years and will appear in 39 million new vehicles sold worldwide in 2017, according to Lux. The firm breaks microhybrids down into light, medium, and heavy categories, depending upon the size of the vehicle and the presence of regenerative braking.
(Source: Lux Research)

Return to Article

View Comments: Oldest First|Newest First|Threaded View
Page 1/3  >  >>
Beth Stackpole
User Rank
Blogger
Start-Stop a great start
Beth Stackpole   2/16/2012 6:27:40 AM
NO RATINGS
These adoption numbers are definitely compelling, Chuck. What are some of the Start-Stop micro hybrids now available on the market? Does the Prius fall into that category (I know it has some sort of similar technology onboard)?

One thing that strikes me about what you've been writing about lately is the variety and depth of efforts underway to address the fuel efficiency and environmental challenge. Given than no one technology can be expected to be the savings grace, it's good to see a lot of different irons in the fire, both as short-term and long-term solutions.

TJ McDermott
User Rank
Blogger
Redesign instead of beefing up
TJ McDermott   2/16/2012 11:17:05 AM
NO RATINGS
Might a redesign of the starter system (instead of beefing up the existing) be in order?  Maybe something that keeps the starter engaged all the time, instead of using a solenoid to pull it in and out on startup?

Rob Spiegel
User Rank
Blogger
Starting and stopping
Rob Spiegel   2/16/2012 11:34:28 AM
NO RATINGS
How does this work, Chuck. Does the car automatically turn itself off at lights and while coasting, or is it a manual task? Is there a delay when restarting? Or is it instant on and move?

Charles Murray
User Rank
Blogger
Re: Start-Stop a great start
Charles Murray   2/16/2012 7:20:20 PM
NO RATINGS
Beth, in answer to your question, yes, the Prius uses start-stop technology. It's considered a full hybrid, however, not a micro-hybrid, because it uses a motor-generator to propel itself and to gather regenerative energy from the brakes. Simple micro-hybrids can't do either of those things.

And, yes, you're right about this being a short-term solution. Interestingly, though, it could have a more profound effect than pure EVs for quite a while, because there will be so many of these vehicles on our streets, all boosting their fuel efficiency by 3-10%.

Charles Murray
User Rank
Blogger
Re: Starting and stopping
Charles Murray   2/16/2012 7:28:55 PM
NO RATINGS
It's an automatic shut down, Rob. The car would use wheel speed sensors and brake pedal sensors to determine if it is at a stop. Then, as you point out, it would have to come back to life quickly, or acceptance of this technology wouldn't be high. To do that, suppliers want to keep the restart -- from the time you move your foot from the brake pedal to the accelerator to actual motion -- to between half a second and a second. To do that, engineers want to use a crankshaft sensor to help "know" which cylinder needs to have fuel injected into it.

Beth Stackpole
User Rank
Blogger
Re: Start-Stop a great start
Beth Stackpole   2/16/2012 7:42:54 PM
NO RATINGS
That's a good point, Chuck. The volume issue definitely compounds the benefits of this approach even if it's considered an interim solution.

Jerry dycus
User Rank
Gold
Re: Redesign instead of beefing up
Jerry dycus   2/16/2012 10:24:43 PM
NO RATINGS
 

TJ is right they need a redesign.  And again they know what to do but won't.

Solution is simple, lower cost, weight.   First go to a 36/42vdc system and replace alt, starter, belts, pulleys, gears, etc.

Then build a motor/alternator in the flywheel.  This saves at least 40lbs copper/car  and another 30lbs in alum and steel plus labor.  All it is is some magnets on the flywheel and some coils next to them. The coils can be made to service easily.

Plus this lead to major performance gains in Air conditioning, power steering, e cams, e oil pumps, etc all can then be electric and smaller, more eff and flexable packaging advantages. Taking al these parasitic drags off the engine and onto the electrical system if 4x's as eff about.  It's things like these and lightweight chassis/bodies along with better aero that will easily get big auto to well above the 54.5mpg goal.  Done right ligter, more eff is cheaper especially in the future when materials become more expensive as more people want them.

Alexander Wolfe
User Rank
Blogger
Re: Redesign instead of beefing up
Alexander Wolfe   2/17/2012 9:05:43 AM
NO RATINGS
Re TJ's comments, I'm pretty sure Chuck has previously reported that many of the start-stop systems are implemented so that you're not repeatedly engaging a solenoid during restart. That would lead to early failures, cause it'd be like using five years worth of your current starter in a month. The point about voltage is also important. Cars went from 6V to 12V in the, what?, late 1950s? Now there are plans go to various high(er) voltage systems, which will help support new technologies. Mostly these will help on the advanced drivetrain side, including the starter issue, as mentioned in the comments, as well as in the increased use of in-auto electronics systems.

kearneyp
User Rank
Iron
Re: Starting and stopping
kearneyp   2/17/2012 9:31:12 AM
NO RATINGS
Current ones in Europe are auto shut down and restart, you don't have to alter your driving at all. I've driven a 3 Series BMW with start stop and it's very good once you get over the feeling that the engine has stalled every time you are waiting at the lights. I think on some manual cars they may be linked to the clutch pedal so that the engine fires up when you press the clutch to engage 1st gear.

naperlou
User Rank
Blogger
Re: Starting and stopping
naperlou   2/17/2012 9:48:45 AM
NO RATINGS

This is a good example of an incremental improvement that is enabled by more sophisticated control technology.  I know individuals who do this manually.  Whenever they know they are stopping for more than a few seconds, they turn the car off.  Most people leave the car running.  In general, for general wear, it is better to avoid starting and stopping.  Of course, this is a leftover from much older carburation technology.  With older cars there was a lot of wasted fuel each time you started up.  This has not been the case for a long time, but people still believe it. 

One other area I have seen this, by the way, is in gasoline powered golf carts.  My relatives on the farm use these to get around off road (with riser kits for the wheels).  If you take your foot off the gas the engine stops.  It starts up quite quickly when you step on the gas and the starter motor also recharges the battery (you use much more of that, of course).  For automotive use the system was probably not acceptable (there would be some perceptible delay), but for this use it was fine.  The reason they liked these, by the way, in contrast to the off road ATV (which they all had), was that they could go a couple of weeks on a tank of gas.  It wasn't as powerful or fast, but it fit the bill.

 

Page 1/3  >  >>
Partner Zone
More Blogs from Captain Hybrid
If you’ve charted the course of the electric car market over many years, then you know that we’ve always been two years away from a metamorphosis … or five years … or more.
Tesla's "affordable electric car" now has a name and a price. The Model 3 will sell for $35,000.
From plug-in hybrids and battery-electric vehicles to CNG trucks and hydrogen-powered cars, we offer a peek at the growing category of alternative fuel vehicles.
Toyota Motor Corp. made its case for a hydrogen-powered future last week by revealing the exterior of a fuel cell sedan that will go on sale in 2015.
At least eight states have launched EV mandates. Auto industry analysts wonder whether automakers can meet their requirements.
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