Stan has it right, but he did not re-mention one thing that was alluded to in his earlier post. Since the PSD cannot be uncoupled from the ICE at any time, the ratio between the ICE and MG1 must be a limiting factor for ICE RPM anytime MG2 is not turning. There is not such thing as only MG1 and the ICE "on line". Therefore, to protect MG1 from over rev, the ECU is going to limit ICE RPM. I would happliy take Stan's side on the bet that the ICE will not rev above 3000 or so when stationary, and probably a lot less.

 

Bob & Stan: Check out this link and you can see the relationship between the ICE, MG1, & MG2 as far as REV's and also speed and REV's. I have posted this earlier in this thread, sorry for the repeat if offends anyone.


http://eahart.com/prius/psd/

 

For your information, the formulas relating the ICE rpm (Ne), MG1 rpm (Ns), and MG2 rpm (N2, 2.478 times Nr, the ring-gear speed) is set by the tooth ratios of the gears in the two planetary-gear sets, and are:
Ne = 0.2778 Ns + 0.7222 Nr = 0.2778 Ns + 0.2914 N2,
while Nr is related to the road speed RS by
Nr = 28.2199 RS (for RS in km/h) = 45.4058 RS (for RS in miles per hour).
[These are deduced from the formulas I gave in the thread "Heretical Mode," posts #27 and 34.]

Since
power = (angular velocity) x torque
one can see from the specifications for MG2 [105 kW @ 4500 rpm; 270 Nm @ 0-1500 rpm] that:

• Maximum power of 105 kW @ 4500 rpm => torque of 700/pi = 223 Nm < maximum torque of 270 Nm
• Maximum torque of 270 Nm @ 1500 rpm => power of 13.5 pi = 42.4 kW << maximum power of 105 kW

So, you can't get the maximum torque at maximum rpm; and you can't get the maximum power at 1500 rpm. These are the maximum ratings for this motor. I think that the maximum torque is limited by the maximum current that it (and the inverter electronics) can safely handle; and the maximum power is limited by the maximum heating effect (product of voltage and current) that they can dissipate.

Stan

 

Exactly what I was going to say...............................

 

Wow! I bow to the superior knowledge of all you guys! I'm learning alot more than I ever thought I knew about my TCH. And all this because ROY wondered why he couldn't rev his ICE while in neutral.

I love this website!

From now on I'm going to rev up my engine to charge my batteries faster and get the heater going, then I'm going to pop it into Drive so I can avoid that 1/2 second of hesitation at the stoplight. I'm looking forward to developing a deep ongoing relationship with my Toyota Service Manager. Just kidding :-)