Slashdot Mirror


GM Criticized Over Chevy Volt's Hybrid Similarities

Attila Dimedici writes "This article says the Chevy Volt is not what GM claimed it was: an Extended Range Electric Vehicle. The Volt is simply a plug-in hybrid. Instead of a vehicle that is only driven with the electric drive train that uses a gasoline engine to charge the batteries, the Volt actually uses the gasoline engine to drive the front wheels at speeds above 70 miles per hour or when the batteries run down. Additionally, the Volt gets nowhere near the 230 mpg that GM was claiming for it. If this is all true, why did GM misrepresent the car? The facts as stated in the article make the Volt a pretty decent competitor to the Prius and other hybrids already on the market." A post at the Car Connection blog takes the opposing view, saying that accusations of GM "lying" are overhyped, since the capability to power the wheels with gasoline is reserved for situations where electricity isn't a viable option. The author says GM didn't mention this ability before now due to concerns over patents and competition from other companies.

13 of 657 comments (clear)

  1. Po-TAY-to vs. Po-TAH-to by fructose · · Score: 4, Insightful

    Its a car that primarily electric driven and uses the gas engine when the batteries/motor can't cut it. Is it really that important what it's called? It's a car designed to be 'green' and that's what it's being sold as. The only thing that GM should be criticized for is the over estimation of the range you can expect. What we call is it pretty moot.

  2. Gasp! Not additional features! by meta-monkey · · Score: 5, Insightful

    So, if the batteries are dead, the car runs like a regular gasoline-powered vehicle. And people are upset by this? Isn't that a great feature? I'd be kind of pissed if I drove a Volt, were stranded in the desert because the batteries died, and when I complained, "jeez, why can't you just make it so if the batteries are dead, the gas engine runs the car?" "Naw, then it wouldn't be an 'electric vehicle!'"

    --
    We don't have a state-run media we have a media-run state.
    1. Re:Gasp! Not additional features! by JesseMcDonald · · Score: 3, Insightful

      The problem is powering the wheels directly from the engine significantly complicates the drivetrain. Before, you just had an electric motor driving the wheels, which means there was no need for a mechanical transmission. Moreover, the ICE was able to run at optimal RPMs because it only needs to power a generator, not supply power to the wheels at a wide range of speeds. This change mandates an automatic transmission (electric mode & multiple gears for ICE) plus variable-RPM support in the ICE.

      In short, they just removed the one feature which IMHO was actually interesting about the Volt, which was the modularity and simplicity of the drivetrain. I was interested before, but now that it's going to be at least as complex (read: failure-prone, high-maintenance) as every other parallel-hybrid on the market I don't see any reason to bother with it.

      --
      "The state is that great fiction by which everyone tries to live at the expense of everyone else." - Bastiat
  3. Distinction without a difference? by Chris+Burke · · Score: 5, Insightful

    From the car connection blog:

    The problem the buff books (and a few online outlets parroting their stance) have with the newly-announced ability of the Volt to supplement power with mechanical energy directly from the on-board 1.4-liter four-cylinder, is that it's no longer purely electric power driving the wheels.

    This is a distinction without a difference. You can burn gasoline to spin a generator to charge the batteries to power the electric motors, or you can partially skip the middle man and send some of that gas-generated power straight to the wheels. Either way, gas is burned to turn the wheels.

    Okay, I think that's a fair point, but in my view it does make a difference. It means the Volt has to have a transmission, which means extra weight and maintenance issues, and all the complexity of an ICE-based drivetrain. It means the Volt's ICE may have to run over a range of RPMs rather than solely running at an optimal RPM.

    So while I'm in tentative agreement that this isn't necessarily a lie, and that the Volt can still look appealing versus other hybrid options, it still makes a difference and reduces some of the advantages the Volt had.

    --

    The enemies of Democracy are
    1. Re:Distinction without a difference? by Anonymous Coward · · Score: 5, Insightful

      It's a one-gear "transmission", where the engine can provide extra power to the wheels. GM actually should be praised for having a simpler, more efficient system than Toyota, but all people can do is scream "You Lie!" and "Government Motors!", because they think they're being clever.

      Other than being "pure EV", there is NO ADVANTAGE-- The loss of 10-15% energy converting from mechanical to electric to mechanical is significantly mitigated, the car is more efficient, performance doesn't suffer under the "highway speeds in charge sustaining mode", and it's a pretty simple modification to the gearset for the primary motor. It also finally answers the question of why they weren't using in-wheel motors. For the first 35-40 miles? All EV. Charge sustaining mode around town? EV with juice being supplied by gasoline engine. Over 70 mph with battery mostly depleted? Now the engine is engaged in the drive-train and you're getting extra oomph from the engine.

      Now, the people who are actually *driving the Volt seem to think it has better acceleration, braking and handling than a Prius, with all of the benefits, and none of the drawbacks... But by all means, let's continue to rant against GM for a difference that 90% of the American car buying public wouldn't even understand, or care about.

  4. Re:They have bad ideas by WindBourne · · Score: 4, Insightful
    First, you missed the batteries. Those add weight, and complexity. Now, you say that you want to add a small motor/generator. Well, as I pointed out, the RIGHT place for such an arrangement is larger trucks. The fact is, that if you need a range extension, then do one of serveral things:
    1. Buy a gas/diesel car. If you are going on long trips regularly, then you are better off doing this.
    2. Buy/rent a trailer with the generator. Seriously, if you need a range extender say once a year, then simply rent a trailer that has the ability to provide the electricity. Of course, the car has to be rigged for that.
    3. Buy a car that has fast charge.

    But it makes ZERO sense to have a 'range extended' car esp. in what is now a parallel system. Basically, GM is shipping a car based on profits to themselves, not based on what is good for customers.

    --
    I prefer the "u" in honour as it seems to be missing these days.
  5. My concern is what stimulus/tax incentives/program by Assmasher · · Score: 4, Insightful

    ...did they benefit from because of this misrepresentation.

    There can be absolutely zero doubt that they knew they were being deceitful, although the purpose may have been relatively innocuous; however, when you add this to the other deceitful tactics they've already employed and have been debunked (230mpg anyone?) a pattern of behavior seems to emerge that would require seriously mitigating circumstances which aren't readily apparent.

    --
    Loading...
  6. Doesn't matter to me by hawguy · · Score: 5, Insightful

    I have a 15 mile commute (each way), and rarely am able to reach speeds of 70mph on my way to work -- 35 - 45 is more typical.

    The Volt would give me an all-electric commute, yet I can still drive it 200 miles to Tahoe on the weekends.

    The all-electric Leaf will give me around 70 miles of range, so no long weekend trips.

    The plug-in Prius (official version, not aftermarket conversions) would give me around 15 miles of all electric range.

    I fail to see the controversy - most people can have an all-electric commute with the Volt. It was already known that the ICE engine would kick in to supplement the battery, the fact that it supplements via mechanical connection in addition to charging seems immaterial.

  7. Re:Decent competitor? by Chris+Burke · · Score: 4, Insightful

    "Owns a controlling stake" is synonymous with "owns" in the context of publicly traded companies, just as "buying 51% or more of the voting stock of the company" is synonymous with "buying the company".

    --

    The enemies of Democracy are
  8. Re:U have to be a fool to buy a volt by Cyberax · · Score: 3, Insightful

    "Seriously, A TRUE serial hybrid using multiple engine/generators DOES make sense for something like the hummer or even a semi. BUT, for small cars? Nope. Far better that these are pure electrics, and if you need a 'range extended', then simply buy a gas car."

    Wrong. Volt-like cars are much better because you'll need much larger battery for pure electric cars. 40 miles is OK for Volt because it can fall back to gasoline at any time. Pure EV should have about 150-200 miles of range to be acceptable. Nissan Leaf with its 100 miles of range is barely acceptable for a fairly small niche.

    Also, your SECOND car will run on gasoline ALL the time, while with 2 GM Volts you can ride almost all the time without using any gasoline at all.

  9. Re:Attempt to delaying uptake of competing product by amicusNYCL · · Score: 4, Insightful

    Alternatively, you should never be driving the car at more than 70 mph as it is illegal to do so.

    Oh yeah? Here in Arizona the interstates are 75mph. In parts of Texas it's 80mph.

    --
    "Our two-party system is like a bowl of shit looking at itself in a mirror." - Lewis Black
  10. Re:Attempt to delaying uptake of competing product by commodore64_love · · Score: 3, Insightful

    Ya know..... if you did just a little bit of research..... you'd know that US Priuses are now ten years old. I've not heard of rampant failures at the 5 or 3 year mark. Have you?

    --
    "I disapprove of what you say, but I will defend to the death your right to say it." - historian Evelyn Beatrice Hall
  11. Sigh, where to start? by Internetuser1248 · · Score: 3, Insightful

    At the beginning I guess: Evidence, the links you provided have plenty, thank you for saving me answering this part.

    The fact is that public transport at least, consumes more energy per mile than cars.

    Actually if you read that table again, you will see that cars are the worst on the list, with the exception of light rail. I could not find the light rail figures in the data linked (no I didn't read all of it so if someone could point me to the relevant table I would appreciate it) so I can only presume the examples cited are among the worst run and designed public transport systems in the world. Apart from this the car is the worst, followed by buses.

    the incredibly cheap costs of highway construction

    What evidence do you have to back up this? Highways are massively expensive especially in city centres. Highways cost around $1 million per lane mile in the most simple circumstances and as commuter tansit around a large already built up city they are astronomical, not to mention the upkeep and repair costs of highway are much higher than rail. some figures if you have as much trouble accessing that link as I am at the moment you can view screenshots of it here

    In addition these figures are for mass transit in the USA, an unashamed car culture. As your own link notes:

    Don't Europe and Asia do better? Much better. This Australian Study cites figures saying that Western Europeans use only 76% of U.S. BTUs/pm in their private transport, and only 38% in their transit -- 2.5 times more efficient. Rich Asians do even better at transit -- they are almost 4 times as efficient in terms of energy/passenger-mile.

    So it is possible to do it 4 times better than those figure that the car is already at the second to last place on.

    Finally

    Finally, repeat after me, there is no energy shortage. There is no energy shortage. There is no energy shortage. There is an energy collection, storage, and distribution problem.

    Well I hate to break it to you, but collection, storage and distribution problems result in there being less energy available for use than we want and need, this is the definition of a shortage