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Old 05-19-2010, 09:16 AM   #11 (permalink)
Engineering first
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Originally Posted by orange4boy View Post
. . . I've had my NHW11 up to 60mph with no problem.

What I don't understand is that if it was so bad to leave the engine in neutral ICE off over 42 then why didn't Toyota explicitly warn against it or install a warning/error/failsafe?

Where does the prohibition come from?
It was 'folk lore' in "Prius Technical Stuff" when I joined. There is some evidence from the Dept. of Energy studies at Battelle that at high rpm, the induced voltages begin to exceed the traction battery buss voltage. Speculation, at a high enough value the inverter power electronics might lose their dictatorial control of ICE operation because of these high voltages. But so far, no one has 'done the forbidden experiment' and tested to failure. Inducing a failure is not enough, we really need instrumentation so we can understand what happened.

The nominal MG1 speed limits:
  • 6,500 rpm - NHW11, no voltage doubling of the inverter (I've survived ~50 mph in this mode)
  • 10,000 rpm - NHW20, which uses a voltage doubling technique

Bob Wilson

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Old 03-29-2014, 01:01 AM   #12 (permalink)
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Which now "begs-the-question" what is the MG1 speed limit for 2010-2014 GenIII ZVH-30 Prii?

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