Start-Stop Hybrids Hit the Road

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Thread: Start-Stop Hybrids Hit the Road

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    Start-Stop Hybrids Hit the Road

    'Start-Stop' Hybrids Hit the Road
    Charles Murray, Senior Technical Editor, Electronics & Test

    "If you start your car two or three times a day, prepare for a shock. Over the next decade, that figure is likely to rise by a factor of 10. Soon your car's engine will automatically shut down at traffic lights and stop signs. It will turn off during heavy rush-hour driving. It may even shut down when you pull your foot off the accelerator and coast, possibly at speeds of up to 75mph. Experts say the so-called start-stop wave is coming, and the auto industry is bracing for its arrival."

    Interesting article in Design News Magazine on start-stop technology. Wonder if we will see this on the next GM truck?''

    More at link.
    Last edited by zete; 02-07-2012 at 09:10 AM.

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    Re: Start-Stop Hybrids Hit the Road

    This technology has been around for a few years already, and from what I read it is used on a much more widespread basis in European cars than here in North America. I'd love to see just about every new car have this available going forward.

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    Re: Start-Stop Hybrids Hit the Road

    Chevrolet Silverado Hybrid (2005–2007) had this.

    From Wiki :
    GM launched a hybrid version of the Silverado/Sierra in 2004, becoming the first ever GM hybrid passenger vehicle. Known within GM as the Parallel Hybrid Truck or PHT it is not actually a parallel hybrid by the current definition, but a type of micro hybrid design. The electric motor housed within the transmission flywheel housing, serves only to provide engine cranking/starting, battery charging, and powering accessories. The engine automatically shuts down as the truck comes to a stop and uses 42 Volt electric power to the starter/generator unit to restart the engine as the brake pedal is released.

    http://en.wikipedia.org/wiki/Chevrol..._Hybrid#Hybrid

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    Re: Start-Stop Hybrids Hit the Road

    common place in Europe so the technology has been tested by most manufacturers. I believe the Fusion hybrids and C-Max will get them for next model year. And maybe hundike too.

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    Re: Start-Stop Hybrids Hit the Road

    Engine Start/Stop systems will become far more commonplace in cars going forward. Unlike european systems that just do Stop/Start, systems designed for the US market will most likely be some version of an eAssist like system. The current EPA city cycle only includes one stop/accelerate cycle and as a result Start/Stop systems have very little impact on the MPG rating. What we are likey to see is a system that has three functions; Start/Stop, ELA (Electric Launch Assist) and Regenerative braking. Obiviously Start/Stop needs no explaination, the ELA function will provide 50 to 60 ft lbs of electronicly suppplied torque in first gear to overcome the inertia of the stationary vehicle. Accelerating a car from a stop to 35 MPH takes far more fuel that maintaining a steady 35 MPH. ELA will have a positive impact on urban mileage. Regenerative braking will be utilized to keep the battery charged. Limited systems like I just described have a significant advantage over the more complicated and power hungry eAssist system. That advantage is cost it does not need very expensive Lithium Ion battery and its attendent cooling system. Current UltraCapacitor Lead acid batteries have sufficient power density and discharge rates to meet the system needs at a price point far lower than Lithium Ion batteries. The lower price point will make these limited systems available even in low cost sub compacts. Additionally the electronic torque at launch will make Atkinsen cycle engines and thier increased fuel economy more common because it masks the torque deficit they have at low RPM.
    Last edited by Ppmammp; 02-07-2012 at 12:45 PM.

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    Re: Start-Stop Hybrids Hit the Road

    Ppmammp ...

    A well reasoned/presented analysis!
    It is important what WE use as our "moral compass" and ...
    the "measuring stick" chosen for judging progress/success as well.


    44 mpg by 2010 ... 2013?

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    Re: Start-Stop Hybrids Hit the Road

    Quote Originally Posted by Ppmammp View Post
    Current UltraCapacitor Lead acid batteries have sufficient power density and discharge rates to meet the system needs at a price point far lower than Lithium Ion batteries.
    eAssist does everything you mentioned, but offers 79ft-lbs of torque at low rpms.. an electric AC compressor would complete a perfect stop&start system if offered with eAssist

    all the companies that were proposing building the new generation of lead acid batteries have fallen away, I think there is still one struggling to commercialize the tech at reasonable costs.

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