05-05-2013, 08:57 PM | #287 |
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Does anyone leave their car in sport mode? Or just switch as needed and usually leave it in comfort mode?
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05-05-2013, 09:32 PM | #288 | |
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My long term average is sliding a bit, because I have a new commute which is heavy stop and go, and no speeds >40mph. Comfort mode is fine for normal driving. I'm probably in Eco Pro more often than Sport. Although I did have a bit of fun in Sport mode today because I was doing some off-and-on the highway. |
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05-06-2013, 08:03 PM | #289 |
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If upcoming advances in battery tech provide more energy density, do you think we can practically "upgrade" the battery module to take advantage? i.e. extended electric range
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05-06-2013, 08:25 PM | #290 | |
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Currently, when braking at maximum regen, the battery gains about 1% every 1-2 seconds, which means it takes about 2 minutes of braking to charge the battery from the 7% "minimum" charge to the 85% "nominal" charge. It's hard enough right now to hit the energy storage limits unless you're going down a really steep hill, or feel like annoying everyone behind you by slowly braking half a mile before every red light. If you put in a bigger battery, it's not going to have much of an efficiency win, if any. Maybe after you accumulate enough charge, you can drive longer in electric mode, but I'm not sure what's the point of that. Maybe novelty, but definitely not efficiency. Once you put a plug on the car, though, then big batteries have their benefits. |
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05-06-2013, 08:32 PM | #291 | |
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Normally I use either Comfort mode or mix in a bit of Eco Pro. I've found that using Eco Pro in situations where you can't resist the temptation to have poor driving habits is the most beneficial. For example, if I only turn on Eco Pro when stuck in stop and go traffic, I can gain an extra 1-2mpg over the course of a tank, without sacrificing my driving pleasure much. Using Eco Pro all day long makes me feel like I should've just bought a Prius |
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05-06-2013, 09:25 PM | #292 |
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Seems like a simple circuit to allow plug-in. But can't the engine also charge the battery, which would make sense if the electric motor was able to more efficiently use the fuel for a trip? Not sure what you mean by "big batteries" though, assuming the newer power-storage densities won't come at a cost of weight or volume and would even be lighter.
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05-07-2013, 10:31 AM | #293 | |
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The net win of the ActiveHybrid is primarily when the battery charges via coasting and braking, recovering otherwise wasted energy. Is it simple to add a plug? I think it might be, yes. A battery charging circuit is conceptually very straightforward. However, that adds additional cost to the car, and at that point everyone will expect a meaningful all electric range. For that to be true, IMO the electric motor needs to be sized similarly to the new Panamera E Hybrid -- about 100HP. Oh yeah, Californians will also expect carpool lane access, which means the N55 must be modified to reach ATPZEV emissions standards. |
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05-07-2013, 08:12 PM | #294 | |
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and it seems that merely 25HP is sufficient to maintain 75MPH and 50HP would maintain 100MPH down the highway for 4000lb. Whereas, right now the electric motor (EM) runs only occasionally to briefly assist at those speeds, even when not accelerating. If there wasn't something like a cooling problem running the electric motor more frequently or for longer durations, then the (hypothetical) battery upgrade should actually allow the EM to contribute x% more for any trip. |
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05-08-2013, 03:01 AM | #295 |
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Coasting? Sure, but most people with a "plug in hybrid" don't like it when their gas engine comes alive with the slightest press of the gas pedal, which is probably close to what BMW will have to do with a mere 25-50HP on tap.
With that said, spy photos show that BMW does have a plugin hybrid 5er in the works -- it seems like they're way ahead of us in exploring down this path The AH3/5's drivetrain is designed in a way that lends towards a really good PHEV implementation that can be achieved "just" by making the battery and motor bigger. And I'm sure when BMW thought of this car 5-ish years ago, they had that in mind as well. |
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05-08-2013, 10:16 AM | #296 |
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Not sure if this has mentioned here before..
i always wonder if the full charge cycle helps lithium based battery to have longer battery life? I've done couple times of the full charge cycle on my AH3; drain the battery down to 3-5% during rush hour, then driving in DS till i get 100% fully charged battery. i am just not going to do this cycle runs if it doesn't help..
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05-08-2013, 11:26 AM | #297 | |
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You really can't do anything to help the pack, nor should you. The only thing is you should not store the car for a extended period of time with the pack discharged at a low charge. In my experience the pack drains at about 3-5% a week so if you're not going to use the car for months, you should get the charge close to 100% before storing it. |
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05-08-2013, 01:27 PM | #298 | |
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05-08-2013, 04:18 PM | #299 |
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Haha, I'm very happy with my current job
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05-08-2013, 09:09 PM | #300 | |
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What you said sounds good, except battery technology is basically the same now as it has been for the past few years now. So they have to use lighter materials for the car and/or a battery with significantly larger volume and weight. But the point was not about how to make the best use of technologies in a whole new platform, but rather how could the same old car take advantage of emerging battery tech. By the time the battery pack needs replacement, or sooner, there might be 2x-5x more storage density, longer life, etc. |
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05-12-2013, 01:27 PM | #304 |
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05-12-2013, 03:38 PM | #306 |
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That will be the first thing I do when mine gets home as well! I will likely leave the trunk badge on though but the C-Pillar ones remind me of the hideous hybrid badges GM puts on their trucks (Tahoe, escalade, etc...) Totally unnecessary and looks out of place...
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05-13-2013, 06:56 PM | #308 |
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How many of you AH3 owners have started modding your cars?
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