Gaston wrote:...
Grelinette asked if there was
un advantage.
I just point out that an EV that leaves at full load at the top of a mountain will be obliged to make the entire descent without
no Engine brake. Like a neutral thermal vehicle
It is
un in case it is better not to leave with the full battery.
elephant wrote:However, experience has taught us that there are days when it is better to have all of its autonomy (see the tip of the Nissan leaf in Canada in the middle of winter which we talked about 2 or 3 months ago)
Yes, there are days (or situations) when it is better to leave the battery full and days when it is preferable that it is not full ...
It's true, I forgot this detail of engine brake with full batteries, which besides had given us a problem with the hybrid carriage
: we had to put in parallel a mechanical brake and a motor brake which operate at the same time or one after the other with necessarily a difference in braking.
In the case of our horse-drawn prototype, taking into account the slow speed, the braking differences are not a big problem, but I imagine that this problem is much more important when it is a car which drives more 100 km / h.
Besides, I remember hearing a driver of a Lexus hybrid regret the absence of an engine brake on his car when going downhill ... (Is this problem solved on recent models?)
Edit: This remark found on a car test site:
“As with all hybrids, the feeling when braking is a little weird, with a sometimes spongy pedal. At first, we are scared. But, despite the feeling on the pedal a little soft, in fact it brakes well! "
This is yet another very interesting technical subject, certainly which takes us a little away from the initial subject, but we can imagine that this problem can be managed with a secondary buffer battery shedding the energy produced, in particular downhill, and always keep the main batteries not full to maintain a good engine brake.
Unless a new battery technology makes it possible to always accept recharging energy even when the batteries are full! ...