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post #21 of 31 (permalink) Old 10-25-2006, 04:56 PM
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I keep reading about changing your driving habits to get better mileage from the hybrids. This is good and well, but the trouble is that if you change your driving habits with a regular car, you can also see much better mileage. From the inputs here, it would seem you could get as good mileage on a regular Civic if you just added electric AC compressor, auto shutoff when coming to a stop, and enough regenerative braking to charge larger battery for the AC and restart of the engine. The regular Civic has an EPA rating of 40 MPG on he highway--I bet you could get more if you babied it, and shut it off at stoplights!
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post #22 of 31 (permalink) Old 10-26-2006, 08:20 AM
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If you do all that, you then have a hybrid. Think about it. If you have a generator already connected to the wheels to accept regenerative energy, then that same electromechanical device can be a MOTOR! So what your proposing is disabling the most important function of a hybrid, but not reducing the part count or complexity at all.
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post #23 of 31 (permalink) Old 10-26-2006, 11:58 PM
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Dan,

What you would have is the same system used on the "hybrid" GM trucks. Several websites I have seen question whether such vehicles are entitled to be called hybrids, since they do not use any electric propulsion system. Nevertheless, there is gas-saving with the auto shutdown. On the GM, there is only about 10-15% saving, or 1.5 to 2 MPG increase for a big truck. The same increase on a Civic would get it pretty close in mileage to the real hybrid. I'm sure you realize such a system is much simpler than the HSD!
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post #24 of 31 (permalink) Old 10-27-2006, 12:01 AM
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Dan,

What you would have is the same system used on the "hybrid" GM trucks. Several websites I have seen question whether such vehicles are entitled to be called hybrids, since they do not use any electric propulsion system. Nevertheless, there is gas-saving with the auto shutdown. On the GM, there is only about 10-15% saving, or 1.5 to 2 MPG increase for a big truck. The same increase on a Civic would get it pretty close in mileage to the real hybrid. I'm sure you realize such a system is much simpler than the HSD!
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post #25 of 31 (permalink) Old 10-27-2006, 09:20 AM
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Again, if a generator is connected to the wheels for dynamic braking, what are you going to do with all that energy, if not use it for driving?

The Civic hybrid (actually all the Honda hybrids) I believe alread does what you propose with the added benefit of assisting the engine with the electric power. That's called parallel hybrid.

HSD is series/parallel hybrid. Under some conditions, it operates more in a series mode, other times it is more in a parallel mode. It can operate anywhere in-between, depending on conditions.
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post #26 of 31 (permalink) Old 10-27-2006, 06:15 PM
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Dan,
The regenerative braking would be needed to charge the larger-than-normal batteries needed to run the electric AC compressor and any other electrical accessories when the engine is off, and also for possible frequent engine starts. After all, if you shut off the engine, you need energy to restart it. The required current would be much less than what would be needed to propel the vehicle, so much smaller generators would be needed, and the system could be much simpler also.
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post #27 of 31 (permalink) Old 10-27-2006, 09:02 PM
 
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Not familiar with the Honda system. Which one is simpler? Which is more effective?

Also, you'd think there are losses with sending electric energy between MG1 and MG2 (thus enabling the "transmission"). Some Hondas have a manual transmission with very little loss.
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post #28 of 31 (permalink) Old 10-27-2006, 09:45 PM
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Mtntraveler,

Honda just bolted an electric motor/generator onto the ICE. It boosts power for acceleration, and generates current at low power requirements. The engine shuts off at a stop, and it has an electric compressor for AC, so you have AC without the ICE running. When the ICE is not needed at cruise, the ICE closes the intake and exhaust valves, for minimum drag. Also the Prius ICE has less HP than the Civic, while the motor in the Prius in much more powerful. Since the Prius motor is also separate from the ICE, I would think it is more efficient.
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post #29 of 31 (permalink) Old 06-15-2010, 11:50 AM
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Default Re: What kind of Mileage are you actually getting?

I owned a 08 Civic hybrid for two years before trading it for a 2010 Prius IV.

The Civic's best mileage is the inverse of the Prius, it's rated at 40-45. So 40 in town is what you can expect. Typically it achieves that by shutting down the engine at stop lights. It won't however until it's warmed up, until it does, you won't get 40 in town. Depending on the type of driving you do, consider the length of the trip, city or highway, etc your mileage will vary. I averaged 43mpg for the two years I owned it - not bad and pretty much right on target - I also tracked my mpg religiously, there was no guesswork involved.

I had two problems resolved under warranty while I owned it, an air sensor needed to be replaced after failing, and the rear control arms needed to be replaced - defective maybe? - either way they caused the rear tires to wear badly on the inside of the tread. They refused to replace the tires even after admitting the failed control arms caused the problem. I only had 24K miles on it.

The Civic has it's pro's and con's, low 40's is good mileage in anyone's opinion, few cars can achieve 40 in town, so that's a plus.

If you are considering buying one and you live in a snowy area - you MUST put snow tires on it to make it functional in the winter, and like any car expect you're mileage to drop in cold and snowy weather (Note that I achieved 43mpg over two years but I never drove it in the winter in Chicago, so expect less mpg overall if you do).
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post #30 of 31 (permalink) Old 04-28-2011, 01:05 AM
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Default Re: What kind of Mileage are you actually getting?

My civic hybrid car giving me 36-37 MPG average.I am happy with my ride.
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