That seems a lot of engineering work/research plus mechanical complexity for minimal benefit (EV between 10 and 30).Rick said:You have to be doing 10mph already at least and moving along at a constant speed and light throttle.
ahhh...but the joy of electric motors! unlike ICE(who need to rev higher to get more torque)...electric motors generate all their available torque from 1rpmDougie said:If the CVT chooses a high ratio (like low gear in the manual), then the internal combustion engine is going to be turning fast, thus giving more friction. If the CVT chooses a low ratio, the ICE will be turning slowly (a lot more slowly), so you get less friction. But then the electric motor also turns slowly, and maybe it doesn't have enough torque to get the car moving.
What type of free wheel device that disconnects the EM and ICE and not have a clutch were you thinking of?Dgate said:Regarding the shuting down of the ICE on the Honda civic, I wonder why they didn't consider a free wheel device between the engine and the electric motor instead of valve deactivation.
No clutch would be required and shifts on a
manual would be accomplished by steering wheel paddles with electric activation of ratio change controlled through a CPU.
PS an electric motor developes its max torque from zero RPM not 1RPM.
I have pdf copy of a technical paper I enjoyed reading from the University Of Michigan that had some graduate students do a project where they studied the effects of adding a 2nd clutch to the Honda Insight between the IMA motor and the ICE... the computer models they did showed some nice improvements... ~7.2% improved emissions and ~22% improved MPG / FE over a standard drive cycle.Dgate said:IamIan.......I'm not sure a particular device exists that could make for easy installation but Honda could certainly engineer one.
There's probably a few reasons why Honda didn't do a free-wheel system...IamIan..
This would not be necessary on my proposal since the ICE would be in autostop and the car would initially pull off on the electric motor and could be driven this way up to its controlled max before the ICE came in.
By doing this the present clutch would be redundant.