- #1

bwilson4web

- 11

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This confirmed the 0-60 is ~9.8 seconds like the current model. But we also knew the curb weight, gasoline level, and Jason's weight.

So three of us independently calculated the power required with similar results and this is mine:

- HP (KE) - the horsepower calculated by the kinetic energy change of the accelerating car.
- HP (drag) - the previous model roll-down coefficients with the velocity squared term (aerodynamic drag) scaled by the improved coefficient of drag change, .24 / .25.

- 40 hp @ 1 second
- 65 hp @ 2 seconds
- 77 hp @ 3 seconds
- 85 hp @ 4 seconds

- levels off at 90-100 hp

I am planning to do a pull-test with our current model, Prius and measure how much traction force it asserts. My thinking is the control laws should limit the zero speed, torque to a finite limit. This is probably in the same order of magnitude as the new Prius since both are rated at the same 0-60 times.

The only other approach would be to set a torque limit and see what it does for the early acceleration curve.

Thoughts?

Bob Wilson, Huntsville AL

ps. Toyota changed the control laws so the engine speed is proportional to the speed. It would make sense that this avoids a useless engine wind-up if so little power is actually needed to the wheels.