IssacZachary wrote:I see what you're saying. I've noticed that at 0mph the motor seems to be drawing practically no power. But as the car speeds up to about 5mph the motor uses a small but noticeable amount of power, even if you're using your brakes going down hill. Canceling that out might help a little bit in the 1 to 5mph area.
I suspect the power graph thingy isn't 100% accurate, especially at low speeds. As you say, it doesn't report any power being used but clearly at low speeds the car is fighting the brake pedal like a classic automatic transmission. I think it may improve efficiency, especially in stop and go traffic, but mostly I think it's annoying.
Still I wonder how much the 0mph anti-rollback and the 1 to 5mph crawl are related and separable.
Well the electric motor is not at all like a traditional automatic. In a normal auto the idle speed of the engine and the unlocked torque converter cause the car to crawl forward at slow speed based on how the mechanism works (and the car can even roll backwards on a steep enough hill). Nissan just emulated that behavior with the electric motor. There is no reason why behavior >0 RPM has to effect behavior <0 RPM. The motor and all the wheel speed sensors know when the car is doing 0.1mph and -0.1mph, and can adjust the behavior instantly.
I was just saying you wouldn't want to be in essentially neutral and not use either pedal on a hill.
I was literally doing just that last night while sitting in horrible <4mph stop and go traffic for at least 20 miles as all the Californians slid off the side of the highway in 1 inch of snow. I just sat there riding the brake pedal wishing there was no crawl. Then on the uphill sections I crawled up and up and up a few feet at a time without touching the brake pedal, only feathering the throttle. I would like to do that on flat ground too.
PS. To hold itself at a stop it's impossible to be using regenerative braking. Even at slow speeds regenerative braking is practically impossible and nonexistent. The Leaf has to apply power to slow the vehicle at those speeds.
Regen is one thing, but motor braking is completely different. Theoretically, the Leaf can supply the equivalent of 80kw of front wheel "braking" force to cancel out any hill. The limit there is traction of the front wheels (I am not sure if the car will automatically apply the friction brakes to all 4 corners, I suspect not).