Quote:
Originally Posted by ken1784
The chart is based on the NHW10 Prius.
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That much is true.
Quote:
Originally Posted by ken1784
Prius and FEH use the same THS technology and have the same kind of limitations.
The ICE on both Prius and FEH always spins above 42mph to protect over-spinning of the generator.
Ken@Japan
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That, for the most part, is untrue!!!!
Using commercially available scan tools I have measured generator speeds in the 12,000 RPM ballpark in the Ford Hybrid Escape. There is a 40 miles per hour EV limit, but generator speed is
not the limiting factor, since the generator is at only 6000 RPM ( half of it's acceptable range ) at 40 miles per hour. A Ford service document says "brief excursions to 13,000 RPM are permissable".
My theory is, above 40 miles per hour there may not be enough available torque to start the engine in some senarios above 40 MPH. Another theory is, the quick deceleration of the generator
required as the engine starts may exceed acceptable limits for "harshness & vibration".
I do think the transmission is
similar to the Prius in general, but is obviously, much more robust. -John