I can see Bolts 1 pedal driving the new road rage trigger

My bet is that the OP Bolt driver was still getting use to the one pedal driving.

Which is a plus for R&D costs. Not only have BEV concepts already made use of that arrangement, but it has been used by diesel-electric locomotives for decades; they are just hand controls instead of foot.

 

Neither did our previous, 2010 Prius, but I fixed that!

Bob Wilson

 

Well, all the Autopilot Teslas have all of the hardware for a blended brake pedal, they just don't use it for that.

And, I believe some passenger trains actually do use a blended brake control, too. Freight separates dynamic braking from friction braking.

 

Let's be clear that you are basing all of this on your experience with a single Bolt driver.

I drive my own Bolt in the San Francisco and Silicon Valley areas where EVs are a common sight so I regularly end up following other Bolt drivers on the highway. I have not noticed those Bolts showing an unusual pattern of brake light engagement.

That's true. I think GM should add some visual feedback in the driver's display screen indicating when the brake lights are on. This would give drivers confidence that the lights are coming on automatically at appropriate times and also give them feedback when it might be coming on at unexpected times.

Also, I think the lights should persistently stay on when one pedal driving is used to bring the car to a complete stop until the car is driven away again.

 

maybe the screen should be programmed to say, 'stop driving like a nut, you're giving us a bad name!'

 

Not every one that uses their left foot to brake ride the brake, and can hit it faster than people behind them expect. Brake lights coming on with sudden deceleration is possible without one pedal driving. it is the driver behind responsibility to be alert and leave a safe distance.

We all should do a better job of reading our car's owner's manual.

For how most people drive, that is true. "He shouldn't have been able to brake that fast," will not protect you from charges stemming from rear ending that person if there brake lights were working.

I did. They just had a basic on/off foot switch; full speed or stop, nothing in between. Car foot pedals have a far greater range of input than those amusement rides, which allows a far greater amount of control. You drive a Prius. You should know this. Between acceleration and the simulated transmission drag from regen on the gas pedal is a spot that puts the hybrid system in a neutral glide. That is simple one pedal driving.

Plug ins that have wider range one pedal driving should have it in the control of the regen braking force on the accelerator.

Without having driven a Bolt, I can't say if the transition is too aggressive. It seems GM set the brake light trigger at 0.1g of deceleration. US law doesn't have a standard for brake lights and deceleration rates, but Germany does, and its threshold is 0.3g. The e-Golf lights on in the 0.1 to 0.2 range. The i3 is set at 0.13, ...
"But if you slow down the i3 gradually by coming off the gas pedal in small increments, you could come to a complete stop without giving motorists behind you any warning. If the driver following is inattentive in real-world stop-and-go traffic, the lack of red lights in his/her peripheral vision can potentially lead to the i3 being rear ended."
Beware Tailgating a BMW i3 - Consumer Reports News
I'd rather have too aggressive brake lights than none at all.

Why? Does the blended brakes have hard ware needed for Autopilot to control the friction brakes not present on standard ones?

Wasn't sure about passenger trains. I tend to think of them as electric since most I see are just that.

It's a good day. I got to read about trains.

Dynamic braking | Trains Magazine

Turns out that regenerative braking came before dynamic.
"Dynamic braking's ancestor was regenerative braking, a feature found in some electric locomotives Regenerative braking was similar to dynamic braking in that wear and tear on wheels and brake shoes was reduced, and train-control was enhanced, but it was different in one important way: the power generated by the motors was not wasted by being dissipated as heat. Instead, the power was returned to the overhead distribution system With their motors functioning as generators, locomotives on downgrade trains could literally provide power to other trains going uphill."
Doesn't work with modern systems though.
Dynamic brakes were originally installed on trains only going to service rails in the mountains, but they've moved out to all trains. Some locomotives had batteries for regen; sounds like these are mostly used for yard work shuffling cars around.
Blended braking is available, but there doesn't appear to be a hard rule on what types of trains use them. I actually don't see a need for it in most cased, but it might be smoother rides for passengers.

Ah, memories. My first car was a 1986 Park Avenue. It had a set of LEDs at the base of the windshield. A small strip of them; easy too miss. They lit up to the corresponding blinkers and and parking lights to let you know they were working. There also a set at the top of the rear window that could easily be seen in the rearview mirror was set right for the rear lights.

 

Yep, basically, the same technology used to blend brakes by modulating fluid completely electronically can be used to control friction brakes in Autopilot. They don't actually need the pedal position sensor, though, but they need everything else, and it'll help make a transition between AP braking and driver input feel more natural, too.

AFAIK, there are some new urban rail systems being designed around regenerative braking into a flywheel bank at each station. Variable frequency drives have made this kind of thing far more workable. (They've also made regen itself more workable, because you no longer have to set up the drivetrain for regenerative braking, as in brushed DC systems, and you get more power over a wider speed range.)

 

my nerves used to get shot too. Then i learned the secret ... all i had to do? i stopped following so closely. See? you can't change anybody around you - but u can change yourself

I take it you haven't watched a good Formula 1 race lately.

Seriously - you tailgate ? You may get brake checked. You get brake checked? This could become you;

Not worth it. And it's not worth worrying if 2 or 3 more people jump into the gap you leave. Big deal. What's it going to cost you, an extra 45 seconds of your day? Boohoo. Leave a few seconds between u & the car in front of you, & not only can you save your nerves, you won't have to worry about that happening to you.
.

 

double post

 

Perfect argument for dynamic cruise control. The computer never gets tired, distracted, or pissed.

Bob Wilson

 

this one pedal driving( it;s just engine braking it had a normal brake peddle as well ) started in 2003 with the caddy XLR..


same shit happens with tahoe/yuk/esc hybrid versions as well so it's nothing new

 

Brake tappers drive me crazy. And with the newer LED lights, its even more annoying. These drivers forget to first take the foot off the gas. These are the type of people that warp their rotors and then complain about braking issues.

 

I swear there are people out there that put a brick on the accelerator and then, use the brake pedal to adjust speed.

 

sorry - but dynamic/regenerative breaking is actually via electric motor .... not the, "Engine" .

sorry again - but both the Prius & Rav4-EV, already had dynamic/regenerative braking in the 1990's. But earlier than those production cars?

Regenerative brake - Wikipedia
So - since EV1 (1st leased in 1996) & others were over ½decade earlier - Caddy was late to the party. WAY late.

.

 

Are you saying the Prius and EV1 were just throwing away brake energy?

Trains have been using dynamic braking for quite some time. The motor becomes a generator, with the electricity being immediately used up in a large bank of resistors. Just like friction brakes, the brake energy is thrown away as heat. Locomotives are one pedal, except the pedal is a hand control.

While technically not dynamic braking, engine braking is the other side of the same coin. Both are using resistances within the drive train to slow the vehicle.

Regenerative braking has been used by trains for nearly as long as they had dynamic braking, maybe longer. Early DC trains and subways fed some of the electricity from braking back into the network for other trains to use. Mechanical, spring based regen systems go back to the 1800s on some bicycles and even horse drawn cabs.

The first car known to use electric regen was an American Motors BEV concept from 1976.

https://www.greencarreports.com/news/1089510_electric-car-trivia-when-was-regenerative-braking-first-used
Regenerative braking - Energy Education

 

the topic was the brake light turning on when not actually pressing the brake flickering on and off randomly without user input i.e pressing the brake peddle
that is what i was talking about...
this discussion is about the brake light coming on without user input


SMH

 

The brake light doesn't come on without the user input.

 

on GMs it does

taking your foot off the gas
turns on the brake lamp
for reg braking