The Prius will sort of freewheel with the engine shut down at speed
below ~40 mph. It's called "gliding" by those who know how to extract
this behavior from the car. It isn't really freewheeling, it's a matter
of MG1 spinning at a speed that allows the engine to cease rotation -
possible in a 3-way planetary gearset.
Have you read up on how the DSG gearbox(s) work?
CR
On 1/30/2010 10:31 AM, Paul Hunt wrote:
> Interesting if the designers have decided to freewheel and keep the
> engine ticking over rather than keep the momentum of the car spinning
> the engine and shut off the fuel completely, it implies the former is
> more economical. Mind you if you have stop/start then it could do both
> i.e. use no fuel *and* have minimum drag. The computer restarting the
> engine and matching revs to road speed as well as engaging the
> appropriate gear and clutch.
>
> PaulH.
>
> ----- Original Message -----
>> ... This gearbox gets into a "free" coasting state whenever the speed
>> is over 20 Km/h or higher and the throttle pedal is fully released.
>> But whenever I apply the brakepedal, the DG box immediately engages
>> the right gearnumber for the current speed.
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