Regenerative braking - Jaguar I-Pace EV400 Forum
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post #1 of 13 (permalink) Old 12-04-2018, 08:00 PM Thread Starter
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Regenerative braking

Has anyone noticed any changes in the degree of regenerative during the time you had the car?

I had my I-Pace for 3 weeks now. I feel the effectiveness of regenerative braking has decreased over the last. During the first 10 days, I was able to do single pedal driving, even at highway speeds. Over the last week, I have felt that the effectiveness has decreased and I don't feel as comfortable with single pedal driving.

I am not sure it is a subjective thing since I was initially driving slowly as I was trying to get used to driving an EV. Please let me know if anyone had similar experiences.

I tried looking up in EV forums from other brands but I did not have much luck so far.

In any case I am going to go the Jaguar North American HQ in the next few days. I live in Princeton, NJ and the NA HQ is in northern New Jersey. My Jaguar dealer knows less than me and I do not blame them because it is an entirely new kind of technology for them.
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post #2 of 13 (permalink) Old 12-04-2018, 08:35 PM
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Has anyone noticed any changes in the degree of regenerative during the time you had the car?

I had my I-Pace for 3 weeks now. I feel the effectiveness of regenerative braking has decreased over the last. During the first 10 days, I was able to do single pedal driving, even at highway speeds. Over the last week, I have felt that the effectiveness has decreased and I don't feel as comfortable with single pedal driving.

I am not sure it is a subjective thing since I was initially driving slowly as I was trying to get used to driving an EV. Please let me know if anyone had similar experiences.

I tried looking up in EV forums from other brands but I did not have much luck so far.

In any case I am going to go the Jaguar North American HQ in the next few days. I live in Princeton, NJ and the NA HQ is in northern New Jersey. My Jaguar dealer knows less than me and I do not blame them because it is an entirely new kind of technology for them.
I thought there was an issue as well, but what I noticed was when the vehicle is fully charged the regen is greatly decreased. As soon as there was enough battery drain to need charging, the regen went back to normal.
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post #3 of 13 (permalink) Old 12-04-2018, 08:56 PM
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Totally normal, all EV's are the same. You can't have regen if the electrons have nowhere to go! Also if your battery is cold, your regen will be far less.
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post #4 of 13 (permalink) Old 12-05-2018, 03:39 AM
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Has the temperature gotten significantly colder over the last 3 weeks? Do you notice any change to Regen the longer you drive? Charge level and battery temperature will impact Regen amount.

What do the instruments and statistics show about amount of Regen?
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post #5 of 13 (permalink) Old 12-05-2018, 08:09 AM
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If you look at the center dial up top, the Energy radial bar graph, you will notice a line? and tick mark on the regen side. This is where the limit is. It appears you won't get full regen until about 95%.
Dynamic Mode might reduce the regen as well if heat becomes an issue. Sometimes at about 90-100mph it doesn't feel like it's regen'g at it's limit.
It seems to get .23 g's of regen without using the brake. And .68 g's of acceleration. Haven't tested cornering yet.
There is a simple track computer with G-Meter, Lap Timer, and Throttle/Brake Mapping on cars equipped with Dynamic Mode.
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post #6 of 13 (permalink) Old 12-05-2018, 08:39 AM
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I thought there was an issue as well, but what I noticed was when the vehicle is fully charged the regen is greatly decreased. As soon as there was enough battery drain to need charging, the regen went back to normal.

Makes sense. I did notice the brake regen was significantly reduced after my first night of charging & then started driving the next day. But, over the course of the day & subsequent days, brake regen (set to high) went back to normal with significant stopping power when I lifted my foot off the accelerator. Thank you.

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post #7 of 13 (permalink) Old 12-05-2018, 10:15 AM
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Unfortunately, the way Jaguar implemented the regen is that one pedal driving is different depending on the State of Charge of the car. The BMW i3 as an example automatically applies brakes when the battery is fully charged to simulate regen, so that the feel is always the same to the driver. Seems safer too.
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post #8 of 13 (permalink) Old 12-05-2018, 12:17 PM
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Unfortunately, the way Jaguar implemented the regen is that one pedal driving is different depending on the State of Charge of the car. The BMW i3 as an example automatically applies brakes when the battery is fully charged to simulate regen, so that the feel is always the same to the driver. Seems safer too.
There is no true one-pedal driving in the i-Pace. Not sure why mag reviews think there is. It wasn't on the prototype or production setup. The regen goes to 0 at about 3 mph. The only car I've driven was a Bolt to get the one-pedal experience. Sadly, I never even tested an i3, so I don't know how it compares. The Bolt has a pretty powerful regen (70kW?). I think the reason that the i3 might use brakes to emulate one-pedal is because it's RWD with a small electric motor. It's fairly easily to skid a car with RWD under engine brakes in wet or icy conditions, so it's safer to apply some front braking. The Bolt and i-Pace have front drive motors that are fairly powerful, and went skid is detected, the electro-hyd stability control valving can increase or reduce braking at each wheel, or just use regen when there is no skid detected.

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post #9 of 13 (permalink) Old 12-05-2018, 01:38 PM
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Originally Posted by piekas View Post
Unfortunately, the way Jaguar implemented the regen is that one pedal driving is different depending on the State of Charge of the car. The BMW i3 as an example automatically applies brakes when the battery is fully charged to simulate regen, so that the feel is always the same to the driver. Seems safer too.
That is not my recollection of my i3, it also had less regen if fully charged. In fact i3 had a near fatal flaw: when regen was active AND you turned the front wheel the regen would stop, causing the car to accelerate when you expected slowdown. It is the ONLY BEV I have had that did that, and was in fact dangerous as you would have to then slam on the mechanical breaks during a turn.

i3 has a few design flaws like that.
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post #10 of 13 (permalink) Old 12-05-2018, 04:18 PM
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I don't like too much automation. Automatically applying the friction brakes would bug me. (expt emergency stopping)
Same for applying the brakes as part of traction control... far prefer an actual limited slip differential such as Eaton Truetrac.
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