Agreed, I see no need whatsoever for linking regen to brake lights, no matter how high the regen is (and the Leaf definitely needs a 'B' mode). When you get on the brakes it should be a relatively rapid but short-turn decel, which is different from descending a hill with a steep grade in a lower gear. In the latter, you use the brake pedal only when the speed has crept up faster than you want and you need to slow for a turn or what have you. I'm often amused, occasionally alarmed, to see someone riding their brakes all the way down a long hill instead of shifting to a lower gear and letting engine compression (in an ICE) slow them; even if their brakes aren't smoking at the bottom, you can usually smell them. As my dad (a truck driver) taught me, "use your brakes intermittently so they can stay cooler, and save them for emergencies; always use primarily engine braking for any long or steep descent. If your transmission fails, you can replace it. If your brakes fail, you can't replace you!"dgpcolorado wrote:That would mean brake lights on the whole way down a hill. Doesn't having brake lights on all the time lose the startle factor that warns the following driver of a speed decrease?garygid wrote:I think, for better Safety, the EV should turn ON
the brake light at ANY Regen level.
Using mild regen going down a hill is similar to descending a hill in a lower gear in an ICE car, the usual technique used by any competent driver on hills. (The rule-of-thumb is that one descends the hill in the same gear as is used to climb the same grade.) As it happens, the Eco regen slows the LEAF quite a bit less than third gear on my ICE cars; I wish it could be dialed up a bit so I can reduce my speed going down those grades without having to use brakes.
Descending a grade in a lower gear or using regen doesn't involve slowing if the grade is relatively constant, so there is no need to warn following drivers with brake lights. It is only the sudden change in speed that needs brake lights, IMHO.
If you need brake lights on to maintain a safe distance behind someone while descending a hill you shouldn't be driving a car in the first place, because your head isn't in the game.