Regen adjust?

There is nothing to adjust. All of the braking on the Prius is done with regen, until it gets down to about 7 mph, at which point it is too slow to effectively use regen. If you want more regen, push harder on the brake peddle.

Tom

 

<div class='quotetop'>QUOTE(qbee42 @ Jun 29 2007, 04:38 PM) [snapback]470254[/snapback]</div>

Doesn't hard braking at speeds >7 MPH also engage the mechnical brakes?

 

<div class='quotetop'>QUOTE(Pegasus_ @ Jun 30 2007, 04:17 AM) [snapback]470200[/snapback]</div>

His vehicle is very low-tech 1999 original Prius, and the mechanical brakes were always engaged when he pressed his brake pedal.
The 2004-2007 Prius is now very sophisticated and most braking was done by regeneration above 7 mph.

Yes, it is adjustable by brake pedal value.
Attila's study shows the value 17 is the best.
http://vassfamily.net/ToyotaPrius/CAN/brindex.html

Ken@Japan

 

Also, see http://techno-fandom.org/~hobbit/cars/bp/ for some figures
and operational discussion on the system. Basically, there's 10-20
amps of "drag" with no feet on either pedal, and if you begin braking
with a slowish risetime you get up to 100 amps of pretty much pure
regen all the way up to that 7mph or so transition point. In the '04
and later prius, the hydraulics aren't touched at all unless/until
needed.
.
You can also play with "B" at speeds < 20 mph for a little extra
drag regen, but really, it's almost exactly like touching the brake
pedal. Only difference is that the rears don't preload.
.
_H*

 

<div class='quotetop'>QUOTE(hobbit @ Jun 29 2007, 07:40 PM) [snapback]470438[/snapback]</div>

I thought that "B" was for engine, not regen braking. When I use "B" I can definitely feel the IC come on, though probably with fuel off. Will have to check this with my ScanGauge.
- Gary

 

I think they should have driver adjustable regen, I really hope they get this in the 2019 Prius

 

I am reluctant to brake my Prius hard because in my mind I am then using the brake pads. How is the regen controlled on the 2016 Prius that I drive?

 

Is there anyone out there, perhaps a Toyota tech person that can explain in laymen terms what controls the regen now?

 

it's basically the same. if you get a scan gauge, i'm told you can see when the pads are being applied.

btw, i think qb was a bit mistaken. it seems some pad pressure is applied and increases as you depress the pedal, iirc.
if you drive efficiently, you'll rarely need to depress the pedal with a lot of force.

 

It is more or less a fool's errand to try to second-guess how the car is making those tradeoffs while you are driving. There's more detail over here, which includes explanation of these graphs.



In general, for driving a Prius, a very good approach is to sit down, turn it on, and drive it.

-Chap

 

They do. It is called the brake pedal. Just watch the monitor so it stays in the EV range.

qbee42, is not quite correct, but given that this post was 2007, probably understandable. But, not all braking is re-gen above 7 mph, and I think the algorithm was changed along the way to increase the amount hydraulic brake application slightly which was possibly done to stop rust accumulating on the rotor (just my theory based on brake dust on my front wheels, given the amount of DWB (driving without brakes) I do, together with gentle foot brake application).

What Chap said.

Just use the power meter to gauge it.

 

... and understand that the power meter on the dash is a huge simplification to give you something to look at, and is not telling you anything specific about when the hydraulic brakes are or aren't in use.

-Chap

 

True, as it is with most of the Prius graphics.

 

LarsWest can I offer constructive criticism?

This is the Gen 2 forum, you have a Gen 4. If if the folks were still active, they would be experts on another car.

The last post before yours is from over 10.5 years ago, many of these posters will have moved on.

Regenerative braking recovers about 30% of the energy, other braking recovers 0% Organizing your life so you do not brake at all saves 100% of the energy. Obstructing traffic will negate all that 'savings' so do not hold up other drivers, and practice conservation on empty roads.

Below about 7 MPH, the Generators are turning too slow to offer much regen, it will all be friction braking.
Below about 25 MPH, B mode can provide regeneration without turning the engine. Engine Braking negates all the good B mode might have done.