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Originally Posted by Double-Trinity
A cruise-control that woudl automatically lock in a certain gas throttle level, then vary assist/regen alone to maintain steady speed would also help FE.
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Intriguing and genius idea. With advances in the Nox trap, perhaps lock it into lean burn for extended periods and have the IMA control speed more, either in cruise or not. I think a mode option like you say would be best for driver control and FE maximization, and those that dont want to mess with it doent have to.
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Originally Posted by finman
It's my understanding that IMA can't have EV mode. The gas engine HAS to propel the car (if it doesn't spin, you don't go) with the electric motor on the same driveshaft as the gas engine, thus an 'assist' hybrid.
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You also leave out the possibility for an electric AWD system, the motors that drive the rear wheels could word to gain electricity while moving and to move the vehicle in an electric only mode.