How many electric motors???

SD3_Driver · #1 07-05-2012, 06:58 PM

How many electric motors does the FFH has???? Besides the traction motor, is there another one???? I've seen people talking about two electric motor but I have not seen any "official" word on this. Also why the charge arrow turns green when under heavy regen??? Looks like it charges a bit faster than normal when green.

Right Lane Cruiser · #2 07-06-2012, 11:45 AM

Hi, SD3 -- it has two main motors arranged in a similar configuration to that found in the Prius. There is a "traction" motor and a "generator" motor. Both are multiplexed with engine input through a planetary gearset which is often labeled an "ECVT" though it bears no relation at all to mechanical CVTs such as the ones in Hondas and is more properly known as a powersplit device. The site below will help you understand how the system works:

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

The regen level is tuned to mimic engine braking with no pressure on either pedal but will ramp up when the brake pedal is used in proportion to pressure applied. The coloration is just there to indicate visually how much regeneration you are using.

CRT1 · #3 07-06-2012, 12:34 PM

Quote:

Originally Posted by Right Lane Cruiser

The regen level is tuned to mimic engine braking with no pressure on either pedal.

[rant] Why to they insist on doing this? I've been gliding in N in MT cars my whole life. That is how my daddy done taught me to do it. It just feels right. Now I am in and AT that can glide in N and all you crazies convinced me to pump my tires up to 50 PSI and if feels great to just roll and roll and roll.

In a car totally designed around efficiency, why kill efficiency with regen braking when it is not being called for? Right pedal is (+) momentum, middle pedal is for (-) momentum and no pedal means let it roll . . . . its not that hard, people! [/rant]

Right Lane Cruiser · #4 07-06-2012, 12:48 PM

I'm entirely on your side of the fence, Chris. There is a dead band that isn't too hard to hit in the FFH with a little bit of pressure on the accelerator, but I shouldn't have to futz with it.

I'm even more frustrated with the LEAF -- that one has almost no dead band at all and requires very close attention to the gauges to achieve zero energy consumption/generation glides. For longer glides and bumpy roads I have to put it into neutral -- which requires holding the shift "puck" in the N position for 2s (pretty much the same as the way the Prius shifter works).

CRT1 · #5 07-06-2012, 01:08 PM

Is it true that the cycle of regen braking back to forward momentum is only about 20% efficient with all of the inversions and losses?

RedylC94 · #6 07-06-2012, 01:56 PM

Quote:

Originally Posted by CRT1

[rant] Why to they insist on doing this? ... In a car totally designed around efficiency, why kill efficiency with regen braking when it is not being called for? Right pedal is (+) ... , middle pedal is for (-) ... and no pedal means let it roll . . . . [/rant]

I agree. It's probably a concession to help avoid confusing stupid people who are accustomed to a bit of "engine braking," and to encourage them to regenerate gently in circumstances when they should be doing so.

Would it be possible to circumvent the default regeneration feature by making a hand-operated contraption to mechanically hold the accelerator at the magic freewheeling angle when one's foot is removed? A software solution would be far preferable and less clumsy, but probably isn't allowed.

CRT1 · #7 07-06-2012, 03:22 PM

Quote:

Originally Posted by RedylC94

I agree. It's probably a concession to help avoid confusing stupid people who are accustomed to a bit of "engine braking," and to encourage them to regenerate gently in circumstances when they should be doing so.

Most of these cars come with a couple of different driving profiles, ECO, Sport, etc. All we need is a HMer option. Or if you like, the "non-stupid" option.

herm · #8 07-06-2012, 04:14 PM

Quote:

Originally Posted by Right Lane Cruiser

I'm even more frustrated with the LEAF .. For longer glides and bumpy roads I have to put it into neutral -- which requires holding the shift "puck" in the N position for 2s (pretty much the same as the way the Prius shifter works).

If the Leaf is moving you can blip it into reverse, it shifts instantly into neutral.. it may beep at you.

I wish they did all these electrics with pushbuttons on the dash to select the "gears". The PIP has a dash gear lever I believe.

SD3_Driver · #9 07-06-2012, 05:19 PM

Nice RLC, now I understand... I was looking under the hood ( with a friend), and was able to see what looks like an electric motor and what should be the PSD, but I was not able to explain or find where the second motor was, so it confused me a bit.....

08EscapeHybrid · #10 07-06-2012, 05:29 PM

Plain & simple, its programmed to mimic the operation of conventional vehicles. That's why it mildly regens when you take your foot off the accelerator, and under 6 MPH it will creep forward when you release your foot from the brake as a normal vehicle with an automatic will. Otherwise, if they didn't make it mimic the operation of normal vehicles as much as possible, they may open themselves up to liability.