inchman254
Member
- First Name
- Dave
- Joined
- Sep 16, 2024
- Threads
- 1
- Messages
- 16
- Reaction score
- 19
- Location
- Collingwood, Ontario, Canada
- Vehicles
- F150 Lightning Lariat, Kia Telluride
- Occupation
- Retired
One Pedal Drive does not save anything over Standard Drive. In fact, it may be slightly worse....
I'm going to use "OPD" for One Pedal Drive and "SD" for standard drive.
@HOTAS In the first paragraph, you say that friction brakes don't kick in until the vehicle is stopped and in the second-last paragraph, you say that disabling OPD forces you to use friction brakes more often. SD does mean that you have to use the brake pedal more often, but that doesn't mean that it uses the friction brakes more often. We do agree on the point that the physical brakes are the greatest waste of energy. Using the brake pedal in SD also accesses regenerative braking until you get past moderate braking and, at that point, you would also be using the brake pedal in OPD. So, I would suggest that, for the same deceleration rate, using the brake pedal is exactly the same as OPD. I get 100% from the brake coach 99% of the time using SD and the brake pedal.
@HOTAS After re-reading your post, I see that we agree on the rest. I'm going to leave this here, just because I went to the trouble of writing it.
As a matter of fact, I would suggest that OPD is, overall, slightly less efficient than SD, unless you have a sensitive sense of acceleration/deceleration and/or spend a lot of time looking at the Power Gauge. The reason for this is that there are inherent energy losses both in producing power to the wheels and in regeneration. My understanding is that regeneration only gets back about 75% of the potential energy. This means that if you accelerate to 60, in OPD, then take your foot off the accelerator, when you stop you haven't gotten all of the energy back; you will have lost 25% (ignoring wind and road drag). Any combination of acceleration and deceleration, or going up and down hill for that matter. The same would be true in SD if you used light to moderate braking in the same scenario. If your Power Gauge shows regeneration, you're not getting it all back.
Any time you use OPD deceleration (or moderate braking in SD) when you could have anticipated the necessity to coast earlier means you are losing energy due to those inherent losses in regen. Now, that is not to say that you can't "coast" in OPD by finding the sweet spot and you described it in your post. I don't use OPD all that often, but my experience is that, if I'm not using cruise control, minor fluctuations in my foot can cause minor activation of regeneration such as in the case where I let the speed build up a bit then ease off on the accelerator too much. If you use regeneration to slow due to a speed limit change, you are only regenerating about 75% of the energy you will need to accelerate when the speed limit goes back up. If you "coast" to slow in either system (zero energy input (foot off in SD, sweet spot in OPD)) you don't regenerate anything, of course, but you will initiate zero energy input sooner and the only energy you have to "replace" is that wind and road drag you used to decelerate. I just find it easier to do this in SD. I also find it more comfortable for my passengers, but that may be just a lack of practice.
If I see traffic slowing ahead of me or approaching a red light or stop sign, in SD my tendency is to take my foot off the accelerator earlier than if using OPD. It certainly takes less attention than finding the sweet spot in OPD and if I'm a bit early, I haven't wasted any energy. If I'm a bit late, then I use a bit of brake and I'm no worse off than if I had used OPD as long as I'm staying under moderate braking. In OPD, it is necessary to be "just right". I know there are many drivers here that hit the sweet spot, but it would take a lot of concentration to hit it every time.
The effect is magnified somewhat in Sport mode with OPD. There are some people who say that regen is greater in Sport mode. That's true, and it certainly looks like it on the gauge but it also means that you're losing 25% of even more regen. Not 25% of your overall energy, just 25% of that apparent regen charge.
Bottom line. If you're regenerating, you're losing a bit. It's just physics.
All of this is the fly shit in the pepper. It's not going to cost any measurable amount of money/energy either way, but I post it to point out that OPD is not necessarily more efficient than SD and OPD doesn't regenerate any more than SD for the same deceleration. It's simply a feature that is there and you can use it if you prefer it. Same as Sport mode. If you like using it, it's not going to cost you very much, but don't fool yourself that it's saving you anything.
I'm going to use "OPD" for One Pedal Drive and "SD" for standard drive.
@HOTAS In the first paragraph, you say that friction brakes don't kick in until the vehicle is stopped and in the second-last paragraph, you say that disabling OPD forces you to use friction brakes more often. SD does mean that you have to use the brake pedal more often, but that doesn't mean that it uses the friction brakes more often. We do agree on the point that the physical brakes are the greatest waste of energy. Using the brake pedal in SD also accesses regenerative braking until you get past moderate braking and, at that point, you would also be using the brake pedal in OPD. So, I would suggest that, for the same deceleration rate, using the brake pedal is exactly the same as OPD. I get 100% from the brake coach 99% of the time using SD and the brake pedal.
@HOTAS After re-reading your post, I see that we agree on the rest. I'm going to leave this here, just because I went to the trouble of writing it.
As a matter of fact, I would suggest that OPD is, overall, slightly less efficient than SD, unless you have a sensitive sense of acceleration/deceleration and/or spend a lot of time looking at the Power Gauge. The reason for this is that there are inherent energy losses both in producing power to the wheels and in regeneration. My understanding is that regeneration only gets back about 75% of the potential energy. This means that if you accelerate to 60, in OPD, then take your foot off the accelerator, when you stop you haven't gotten all of the energy back; you will have lost 25% (ignoring wind and road drag). Any combination of acceleration and deceleration, or going up and down hill for that matter. The same would be true in SD if you used light to moderate braking in the same scenario. If your Power Gauge shows regeneration, you're not getting it all back.
Any time you use OPD deceleration (or moderate braking in SD) when you could have anticipated the necessity to coast earlier means you are losing energy due to those inherent losses in regen. Now, that is not to say that you can't "coast" in OPD by finding the sweet spot and you described it in your post. I don't use OPD all that often, but my experience is that, if I'm not using cruise control, minor fluctuations in my foot can cause minor activation of regeneration such as in the case where I let the speed build up a bit then ease off on the accelerator too much. If you use regeneration to slow due to a speed limit change, you are only regenerating about 75% of the energy you will need to accelerate when the speed limit goes back up. If you "coast" to slow in either system (zero energy input (foot off in SD, sweet spot in OPD)) you don't regenerate anything, of course, but you will initiate zero energy input sooner and the only energy you have to "replace" is that wind and road drag you used to decelerate. I just find it easier to do this in SD. I also find it more comfortable for my passengers, but that may be just a lack of practice.
If I see traffic slowing ahead of me or approaching a red light or stop sign, in SD my tendency is to take my foot off the accelerator earlier than if using OPD. It certainly takes less attention than finding the sweet spot in OPD and if I'm a bit early, I haven't wasted any energy. If I'm a bit late, then I use a bit of brake and I'm no worse off than if I had used OPD as long as I'm staying under moderate braking. In OPD, it is necessary to be "just right". I know there are many drivers here that hit the sweet spot, but it would take a lot of concentration to hit it every time.
The effect is magnified somewhat in Sport mode with OPD. There are some people who say that regen is greater in Sport mode. That's true, and it certainly looks like it on the gauge but it also means that you're losing 25% of even more regen. Not 25% of your overall energy, just 25% of that apparent regen charge.
Bottom line. If you're regenerating, you're losing a bit. It's just physics.
All of this is the fly shit in the pepper. It's not going to cost any measurable amount of money/energy either way, but I post it to point out that OPD is not necessarily more efficient than SD and OPD doesn't regenerate any more than SD for the same deceleration. It's simply a feature that is there and you can use it if you prefer it. Same as Sport mode. If you like using it, it's not going to cost you very much, but don't fool yourself that it's saving you anything.
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