I've seen this argument before, and don't understand why implementing regen thru the left pedal as opposed to the right one makes a difference in efficiency. As long as the same amount of regen is implemented before blending in the friction brakes, why would the efficiency be different?
What is that?
One can, of course, argue about what is "proper technique" but it doesn't seem that there is anything that friction brakes can do that regen can't except decelerate faster than what one using what generally is thought of as "proper techniqe" should require and hold on a hill or serve as a "parking brake". And this is what the friction brakes do in Telsas and other BEV.[/quote]
It wouldn't nor does the post you quoted suggest that if would be. The quote from me claims that blending in friction brake, except at the last minute, is wasteful of energy. It does not say that implementing regen with paddles or levers or knobs or joysticks or roller wheels or trackballs is. In true one pedal driving one can invoke up to full regen without calling for any friction braking whatsoever as one can do with paddles, etc as long as the friction brake and regen are not coupled in the same control. The "problem" with systems that invoke regen with the wide pedal is that one can overshoot and wind up in the friction brake zone when he didn't intend to. I put "problem" in quotes because this isn't really a big problem if one is careful but it is interesting to think about this and true one pedal driving is certainly a pleasure once one gets used to it (which should take you about 10 minutes).
One pedal driving can, and often is, implemented on vehicles with blended braking.
As I mentioned previously, controlling the vehicle’s attitude, or weight at each corner.
No one has said otherwise.
That's your opinion which is not shared by all. The problem was first pointed out to me in a review of a vehicle (I can't remember which) that exhibits this problem. I don't have this problem as I drive a vehicle where regen is isolated. But in order to check the concept I figured that if my motor skills are good enough that I can go right to the border on a blended pedal I ought to be able to set the regen pedal to exactly 0 power on an isolated regen car. i can't but perhaps your motor skills are better than mine.
No. Not even arguing. I like the isolated systems both as an engineer and a driver. You should buy what makes you happy,
A more intelligent continuation would point out that Tesla has sold lots of BEV and accumulated data on billions of miles of actual driving and, given that their engineers are demonstrably smart, only a fool would ignore what Tesla has learned (they offered various level of blending over time). indeed it appears that Rivian has been smart enough to do this as they have, AFAIK, turned off all the options that they evidently tried in test/demo vehicles. To be a bit more technical we would point out that if you ever use the friction brake when you don't have to you have wasted energy and cost yourself range. An isolated system does this and, of course, also simplifies the control system design. This makes it clear that Tesla's motivation is to get better EPA range numbers and indeed they do get quite a few extra from their regen approach.
You didn't actually say that this was the "equally important role" though I suspected that this was what you had in mind.
I'm afraid I can't do that. Deceleration is the reason we have brakes (regen or friction) and "weight transfer" the penalty that we pay for having them because they decelerate the vehicle using thrust vectors that are not directed through the vehicle center of mass. The resulting torque (perpendicular to the longitudinal axis) tries to rotate the vehicle in the axial plane and must be offset by weight transfer associated torques. Let's start by observing that a BEV with its low COG is less subject to this phenomenon than an ICE vehicle but nonetheless it exists. Then lets point out that a deceleration vector of a given magnitude has exactly the same effect in this regard whether it is developed by a friction brake or a regenerative brake. Thus, again, we see that there is nothing the friction brake can do for us (or to us) that regen can't (or doesn't).
I am not trying to dodge your questions, the answers will take more pages than available to explain. Many books have been written on performance driving techniques, and countless discussions continuously happen on many other forums. Frankly, as best as I understand your type of driving, it most likely does not matter.
I think I understand why you are confused.
If you turn off one-pedal Regen braking because you want the car to function more like a normal vehicle, Tesla does not regen and starts using the mechanical brakes immediately upon the brake pedal being depressed. They don't have the hardware in the car to not do it this way. Personally I prefer "one-pedal until it isn't slowing enough" which works just fine in a Tesla, but if you want the traditional ICE "don't slow until I hit the brake pedal" it doesn't.
The kind of driving you are apparently thinking of is completly irrelevant to the way the driver of BEV experiences regen 99.999% which is on road. Going off road is an entirely different ball game as is the racetrack. The techniques one uses in those cases (yes, I had to take the Toyota course before the company would send me out to dodge kangaroos in one of their Landcruisers) are quite different. One does not, I hope, drive on the highway as he does on the track and if you are claiming to be a different sort of driver than I because you know some braking trick used by racing drivers I only hope you are not on the parts of the highway system I am on! On road the various techniques I think you are referring to are unnecessary because the vehicle manages those so much better than you can taking and processing measurements every few milliseconds.
I think you are a little confused about how this works. Blended systems, as the name suggests, blend in friction braking during regen when the driver wants to slow down. It is in an independent system (like Tesla's) that the car adds in friction brakes on top of 100% regen. This is what happens if you take your foot off the skinny pedal (100% regen) and plant it on the wide one. Regen remains on.
