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Gorski
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Platinum
Start-Stop batteries
Gorski   3/27/2014 9:34:26 PM
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I think start-stop is another way to improve gas mileage, especially at rail crossings. What I don't understand is why are we reinventing the wheel? Golf carts have been start-stopping for years. I don't hear anybody picking up on their technology. It works, use it.

Ratsky
User Rank
Platinum
Re: Traffic!
Ratsky   8/28/2013 9:13:56 PM
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That's another advantage of the "motor-generator" with regenerative braking approach.  It's ALWAYS turning and doesn't need the solenoid/cog/etc. stuff.

Charles Murray
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Blogger
Re: Traffic!
Charles Murray   8/28/2013 4:29:09 PM
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I'm sorry I didn't see your comment earlier, Ratsky. You raise an excellent point about decelerating to a crawl without stopping. There's been a lot of discussion about this and it's not clear how the auto industry will handle it. The most basic problem is synchronizing the starter motor to the powertrain's spinning ring gear during deceleration. Some suppliers say they can do it reliably now, but I don't expect to see this feature reach wide application for a while.

Charles Murray
User Rank
Blogger
Re: Maybe multiple solutions are needed?
Charles Murray   6/6/2013 7:41:46 PM
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Here's another alternative -- a custom battery formulation for hybrids.

http://www.designnews.com/author.asp?section_id=1366&doc_id=250256

Charles Murray
User Rank
Blogger
Re: Maybe multiple solutions are needed?
Charles Murray   6/6/2013 7:38:51 PM
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Yes, TJ, a blended approach will absolutely be necessary. High-energy lithium batteries for stop-start are overkill. Considering the number of vehicles that will use stop-start in a few years, there's a large nough market there to support a custom battery formaulation.

loadster
User Rank
Gold
Re: Start-stop batteries
loadster   6/6/2013 1:05:26 PM
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Yamaha and harley and Club car and Cushman are all low horsepower, low torque and small displacement engines. I suppose the technology is scalable but they use standard lead acid batteries and the stop-start requirements are looking for something with more power density. Also the reliability and maintenance cycles are different. Most golf courses have dedicated service areas with constant work being performed on the failures that occur with regularity. This becomes overwhelming as the fleet ages and this is why golf cart business is enduring.

Ratsky
User Rank
Platinum
Traffic!
Ratsky   6/6/2013 1:04:36 PM
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As one who commutes daily over 13 miles of extremely congested roadways, I wonder about how "start-stop" will help much if at all in that environment.  Typically, in the worst areas, you stop VERY frequently, but only for a few moments, then start crawling again.  I estimate on an average day, I would come to a complete stop (momentarily) and start motion again (15-30 seconds later) perhaps 50 or more times each way.  BTW, at least half of these cycles would be completely unnecessary if it were not for the many "over-reactive" drivers  whose reaction to ANYTHING is to slam on their brakes!

Gorski
User Rank
Platinum
Re: Start-stop batteries
Gorski   6/6/2013 12:18:25 PM
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Golf carts can stop and start 70 or more times in 18 holes of play. Multiply that by 2 or 3 rounds of golf a day for a season and you see that there is a lot of use. I think that technoligy has proven itself. Why is it not being exploited?

Gorski
User Rank
Platinum
Re: Start-stop batteries
Gorski   6/6/2013 12:18:21 PM
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Golf carts can stop and start 70 or more times in 18 holes of play. Multiply that by 2 or 3 rounds of golf a day for a season and you see that there is a lot of use. I think that technoligy has proven itself. Why is it not being exploited?

loadster
User Rank
Gold
Re: Start-stop batteries
loadster   6/6/2013 10:03:37 AM
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Golf carts are not an equivalent parallel for this application. They are marketed for a sport that takes a perfectly good piece of desert and paves it with money until its a thriving, hydro-succulent oasis that sucks more water and money. And somebody bets on how long it can last. And another Vegas, Atlantic City and Dubai is born.

This is about engine cutout and having 200-500 cold cranking amps available over and over not just 5 to 10 times a day. And the chemistry keepers need to do their best work ever.

What happened to the kinetic energy recovery system (KERS) volvo was working on with formula one racecars? Did they decide that having that high velocity flywheel in the trunk of a car was even more dangerous than a hydrogen tank or hydrocarbon fuel bottled up? That would be a good way to restart an engine even if it can't restore the car's kinetic energy.

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