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Thread: more efficient car

  1. #1 more efficient car 
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    Why not produce electricity by incorporating small generators on each wheel axle? I consider it to be feasible, and would be interested to hear the 'negatives' about such an idea.

    It is not 'free' energy as such: More like 'recoverable energy' that is not being utilised at the moment.

    The principle is the same as that on a wind farm. Here, the air turns the blades which then turn over a 'motor' (generator) to produce electricity.

    On a car the wheel turns the shaft, running through the centre of a dynamo, to produce electricity.

    A car could be designed on a hybrid basis consisting of a small combustion engine, and electrical generators on the axle of each wheel.
    There is not that much friction created as a consequence of this.
    While the car is being propelled by the combustion engine, the wheels are being turned anyhow, so why not convert that motion into electrical energy, and store it, or use it to supplement the combustion engine, enabling a true, self-charging, hybrid car.

    What do you think?


    jrey
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  3. #2  
    Universal Mind John Galt's Avatar
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    The resistance imposed on the system by the generator requires more torque be applied to the wheels by the drive shaft to maintian the same road speed. That in turns requires a higher output from the engine. Frictional losses ensure that the energy you gain from the generator is less than the extra energy required to be input by the motor.

    The short answer: it wouldn't work.


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  4. #3  
    Forum Junior Cuete's Avatar
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    To store energy in the electric batteries, you would need to take the same amount of energy from the combustion engine system as it works, making it work more... no energy saving, just storing it electrically to use it later.

    But some how Toyota does it with Prius:
    http://hybridcars.about.com/od/hybri...priusworks.htm

    It takes energy from the combustion engine and kinetic energy from the brakes to store it in batteries.
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  5. #4  
    Universal Mind John Galt's Avatar
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    Kinetic energy from braking is quite a different matter, and wholly sensible.
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  6. #5 Hybred cars 
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    The Prius works that way. In its system you have to use the Gas motor and Electric motor as a single unit as the car cannot work on eighter alone. It has 200 volt system with 76 hp elect and 76 gas 4 cylinder with seamless coupling via computer. Prius even shuts off if engine is not required like coasting or red light.
    It dose get 550 miles on 11.6 gallons gas on road. It gets 600 miles on 11.6 in town.................

    Yes mine is White. speed I can run with anyone and snap to 80 mph with most cars. At 80 mph I get the 550 to as computer shows it.

    Its a medium size car and has a lot of room.

    In your system you would need to solve the seamless factor for drive (transmission) you feel no rpm diferientials with Prius as it goes in or out. Hope this adds to the mix...

    There is a motor gas thats a turbine similar to Wankle but the trick is a varible cylinder wall so the combustion chamber at last moment is squezed by a cam effect. This solve super high compression and engine runs on anything flamable. You would get 70 mpg easy with it.
    If interest shown Ill post more on Photo effect Wangle turbine.
    Oh 4 cyl one plug and spare plug like a Aircraft engine...
    Jim Smith
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  7. #6  
    Forum Junior Lucifer's Avatar
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    Coupling generators to the wheels would be less efficent than couple a generator to the engine shaft itself, as there's energy lost in the transmisison. ITOH, recover energy by electrical braking is being used, as has been said, in cars such as the Prius.
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
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  8. #7 Prius 
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    Quote Originally Posted by Lucifer
    Coupling generators to the wheels would be less efficent than couple a generator to the engine shaft itself, as there's energy lost in the transmisison. ITOH, recover energy by electrical braking is being used, as has been said, in cars such as the Prius.
    Prius charges via engine and braking. When in braking mode car acts like its in Overdrive without transmission. Computer charges battery as required while driving. The whole secrete is in that computer seamless control of all battery needs.
    Main trick is 200 volt battery, your drive motors put out 76 hp elect.

    So the feed water cooled inverter with 200 in and lower voltage out to motors that translates to power. Also all asc items AC, Steering pump and water pump run electric. Alternator on a coventional car takes 7 to 22 hp off engine they get awau with power loss and car is light streamlined to remove wind drag. All eliments are tuned to efficency..
    Thanks
    Jim Smith
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  9. #8 Prius 
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    I am into the 20010 model.........bigger better, more mpg.

    Charging is not done via wheels unless you are braking

    "Atkinson cycle" provides good fuel economy, it is at the expense of a lower power-per-displacement as compared to a traditional four-stroke engine.[2] If demand for more power is intermittent, the power of the engine can be supplemented by an electric motor during times when more power is needed. This forms the basis of an Atkinson-cycle-based hybrid electric drivetrain. These electric motors can be used independently of, or in combination with, the Atkinson-cycle engine, to provide the most efficient means of producing the desired power.

    Look up WIKI PRIUS see cycle....Atkinson cycle

    This larger engine gets 50 mpg my 2005 got 450 mpg

    The interior is larger.....

    But the secrete is in its total make up......AC,Water pump, elect... and design of hull.

    I put 12000 miles on 2005

    20010
    This will drive a mile on Electric button, only and has, Power button to get fast in and out driving in traffic.
    Vs: 6 cyl I had I save 375$gas Mo.
    Jim Smith
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  10. #9  
    Forum Freshman Gen1GT's Avatar
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    Wow, old thread resurrected. The Prius is a single-focus car; efficiency. Too bad it drives like crap.

    I think everyone understands that you can't get something from nothing (which is why wheel-mounted gensets won't work)...however, in developement are reciprocating dynamos that will be mounted in the shock or strut towers to capture the energy used to dampen strut movement.
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