Quixotix wrote:To reduce "range anxiety" Nissan could add a special function to recharge the batteries by towing the car.
Hmmm. I have to agree with the other comments here. I do agree that any electric motor is also a generator when torque is applied to a motor that is not otherwise being driven by a current. And yes, the LEAF can do reverse -- beep beep beep beep beep... -- but this is probably done through some physical gears rather than reversing the A/C. But even if it isn't, the thing to remember here is regenerative breaking is turning some motor (maybe not the main motor) into an A/C generator no doubt with some additional break force as the momentum of a car alone would only be able to charge a battery at a trickle and for a very long time compared to the desire to break. This is the effect of the LEAF's eco mode: when you're foot's off the gas, all your momentum (not already being eaten by wind and rolling resistance) is slowly being trickled back into the battery to charge it. The thing clearly to remember here is you can't regenerate and drive at the same time, natch.
So, and here I have to feign ignorance, my understanding of the regenerative breaking system of most cars is that you apply breaks as normal and while the tires slow to a stop you turn an electric motor into a generator and turn that motion into A/C. You then run it through the inverter to charge the battery. If this be the case, the problem with charging a battery via this method is that regenerative breaking is only engaged when the breaks are also. This would be a safety measure as people don't typically engage the acceleration at the same time as the break (unless they're a bit touched in the head) so it's safe to reverse the inverter to start charging -- disabling all all power to the wheels -- and instead use the dedicate circuitry to run the the motor, generate a current, run it through the inverter to generate D/C and then use that to charge the battery. So therefore, on previous Hybrid and Electric vehicles, you couldn't engage the regenerative breaking when idle or neutral or in any other car mode, only when breaking. Doing so would fail to engage the regenerative breaking and thus cause damage to the car by running current through circuits that weren't ready to accept it.
, as I said before, the LEAF has this sluggish eco-mode feature, where you add momentum and coast, add momentum and coast, etc., always decelerating slightly while coasting as the drag, rolling resistance and battery charging eat up your speed. But this mode is exactly what our Quixotix friend is talking about! So, in principle, the LEAF may be an exception to the Thou Shalt Not
rule. If you could just put the car in ECO mode, engaging the ECO circuitry while someone pulled your car while dragging the wheels you might just get some benefit. Of course, that's a lot of if
s, and as I said, I don't really know how all this stuff works.
It's an interesting idea though and I think the real question we need answered is: can the car be charged in ECO mode when there's no-one behind the wheel and the car is just free-moving?
RIP CO2 Fre
, 27 months, 42,282 mi & 11 bars.
unAmerican Job & Nissan's Rapid Depreciation cost $20,000!
on the road daily w/o Charge at Work
Long Live CO2 Fre
, Maxed 2013 SL, 20,000 mi/yr lease.
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