Tech Question: Highway Stealth Mode

me thinks the ICE is still on but not using any gas. it is the same as coasting on a hill. in a regular ICE, the car will still idle.

in the case of the Prius, the ICE may shutdown, but it still continues to turn.

the other day for the first time ever (i wonder if it has to do with the colder weather we have had) i felt the ICE start up when traveling near 50 mph. this was verified by the mileage indicator going from 99.9 to 30 something.

 

on the 2k3 the mini scanner say's the engine is turning over but the fuel flow to the injectors is cut off and the rate of air flow into the engine is really low according to the scanner. The valves are never left "open" at any time, at the time when the speed is high enough that the ICE spins to protect MG1 from an over speed condition the VVT-i retards the cam timing to lower the compression pumping effect.

 

I wish we had the scanner for the 04s and 05s. I would like to learn more as well. The display shows electric only operation down hill at 65 mph or at least it did when I was coming down off Lookout pass on I90 coming home. I saw it at 58 on the freeway yesterday in cruse control. I had a question about backing up that may or may not be related. When you feel the ICE cut in during back up is it consuming gas or just spinning up?
PS anyone know when the scanner will be ready??

 

any time at low speed if you feel the ICE start up it's using gas. In Reverse it runs MG1 to provide power to MG2 to provide full power for reverse.