Regenerative Braking - D or B ?

I tried this today out of curiosity. It doesn’t keep holding on a hill, like you can sit there with foot off brake. It seems to hold a couple seconds then I could hear the brakes releasing. I only tried once.
Now I am wondering if I hurt something rolling back a little in D with my unnecessary testing. Probably not but what happens in D and the car rolls backwards down a hill? In EV mode.
I didn’t try the second brake push for the beep. I don’t think I am messing with it again, not having problems, and I always keep foot on brake on hills. It seems to hold for a couple seconds, which would be in the time needed to push on the gas pedal. That’s all I need to know.

 

So I tried and it doesn't work. As soon as I release the brake after pressing harder on the brake pedal once stopped (without first releasing it), the car starts to creep forward.

 

In my 2010, the hold is not on unless your second, harder press was hard enough to get the beep and the blinking traction light.

So if you didn't hear the beep or see the blinking light, then either you didn't press hard enough, or you don't have that feature (or you have it but they changed how to use it).

 

Ok, I'll search to see if it's an option, thanks again.

 

That's right: it holds just until you push the go pedal, unless you take more than two seconds to do that, in which case it lets go at two seconds anyway.

I just looked on page 479 of the 2017 Prime (US) owners' manual, and it is described there the same way Leadfoot described for the 2018 c: no special action or beep or anything, it just automatically works, whenever the conditions match what that page says.

Rolling backwards in D doesn't hurt anything in the drivetrain; neither does rolling forwards in R. There's nothing spinning in there that isn't made to spin all day. Of course if you roll backwards into something, that's another story.

 

Just to point it out- the automatic hold I frequently use in hilly Pennsylvania is strictly a hill-holder. If we stop our car on a level road or a downgrade, releasing the brake pedal will allow the car to creep forward gently.

I recently rented a car that had a full automatic hold feature. If I stopped anywhere, up hill, down or level, the brakes were held on until I stepped into the throttle by a certain amount.

I don't think any Prius has that feature.

 

Yeah, that's what I noticed too, bummer. In my Model 3, you can see the brake pedal being pushed in by itself after you have stopped. It pops back up as soon as the accelerator is pressed, but it can stay pressed for as long as you are stopped and in drive.

 

I can't think of any good reason to use "B" in level terrain.

 

That's what I'm doing too. Hybrid Assistant is really helpful at knowing how much you can press the pedal before the physical brakes kick in.

 

P479:

 

Yes, that I did see that but how I read it is it's to hold the vehicle in place for two seconds when on an incline, not for a flat surface. I'm almost never stopped on an incline and my red lights last more than two seconds unfortunately lol.

 

Haha, to each their own I suppose.

I hated that rental because of that behavior. I was about to take it back for a swap when I found a control to disable it.

 

Yeah, it's nice that they offer you a choice (Hold, Creep and Roll). Too bad Toyota doesn't do the same though.

 

The Gen 5 has added brake hold. (Hill start has been there since at least Gen 2).

 

Nice that they finally added it. Too bad that they can't push it to previous gen though.

 

I wonder (reading between those last few lines) if they are using the electric parking brake to do it.

Grumble. I dislike electric parking brakes.

 

It apparently uses the main brakes initially, because the manual says it will switch to the parking brake after 3 minutes.

(Whereas the hill start never used any brakes, but just held with the electric motor.)

 

My current manual transmission Subaru also has a hill start feature built into its clutch. It seems now implemented using electronic control of the brakes instead of some older mechanical clutch mechanism used on older Subarus, though absent from my original Subaru.

Having long used manual transmissions without hill-holder clutches, I had to disable it, because it seriously screwed up my long-ingrained reflexes for operating a clutch. I'm accustomed to a slight roll-back on uphill starts, and the feature messed up my pedal timing.