it's been 7 years if not 10 for blended braking to be on the market, they are like on gem 4 get 5 of the technology now.
It's had always been the Tesla people claiming blended braking is jerky and the Elon way is better. What they didn't want to mention is that Elon 'invented' one pedal driving cause he can't get blended braking to work on his cars. he doesn't have the money nor the time to develop such a system. It's far cheaper and easier for him to direct his programmers to flip a switch and reverse the current on the motors to act as brakes.
Physics is your friend when talking about efficiency. Coasting down the road will always be more efficient then constantly suppling power then capturing back the power. No matter how good the converters are, there will be loses. In a Tesla the moment the gas pedal is lifted, the car goes into regen mode, meaning converting the kinetic energy to electricity. But that same kinetic energy is perfectly capable of moving the car down the road, so why waste some of that energy via conversions.
In a city, stop and go traffic pattern, perhaps it's more advantageous to have lift over regen, the driver can be lazier and just keep the right foot over the gas pedal instead of moving back and forth, and the car slow itself down in the process. But in just about any other driving situation, there is really no point in using one pedal driving. With such a religious process on recapturing electricity, that's why Teslas have amazing city mileage figures.
It's also advantageous having one pedal driving on off roading. The current Kelly Bull Book YouTube review of the Rivian truck mentioned it. The lift off regen do a great job controlling the truck's decent speed. I have to agree with that, as all cars/trucks with off road capability have hill decent control, function of which is to keep the driver's foot off the brake pedal to prevent locking up a wheel or two.
One pedal driving isn't the worse thing invented, it has it's time and place to be useful.
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