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#4575096 - 11/15/17 02:59 PM Regenerative braking yay/nay?
MoneyJohn Offline


Registered: 03/01/12
Posts: 165
Loc: Southern NY
I am not too sure if this is a right forum for this question. Admins can feel free to move accordingly.

This question is on my mind for a while. One of my vehicles has regenerative braking whereas other one does not. I personally do not like regenerative braking, esp for city driving. Many times I go from a light to the next one without my foot on an accelerator, the car just rolls. Whereas that is not possible in Forester because of regenerative braking. Sometimes I have to push pedal even on a downward slope.

What do others feel about regenerative braking? What are the benefits that I have failed to realize?

Many thanks in advance.
_________________________
2015 Subaru Forester 2.5i Premium w/ EyeSight
2006 Nissan Sentra 1.8S Special Edition

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#4575105 - 11/15/17 03:07 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
Eddie Offline


Registered: 12/07/03
Posts: 9382
Loc: Florida, Cape Coral
You get away with idling from light to light? I didn't realize 2006 Foresters had regenerative braking. I thought it was used in electric and Hy-bread vehicles only. Enlighten me. Ed
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#4575123 - 11/15/17 03:19 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
nthach Online   content


Registered: 01/02/04
Posts: 3665
Loc: California
Unless Subaru installed some sort of KERS or the "mild" hybrid system off the XV Crosstrek Hybrid, I doubt you have any provision for regenerative braking.

The Forester's CVT control logic probably incorporates better hill sensing and will hold back a "range" or two to keep it going steady down hill. Most automatics/CVTs have grade logic control that theoretically helps going up and down hill. In my experience the system does work well in some but I've always had to manually shift the Subies I've driven to get some decent acceleration up and deceleration down.

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#4575143 - 11/15/17 03:32 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
Cujet Offline


Registered: 02/15/03
Posts: 6973
Loc: Jupiter, Florida
I think you mean that the engine is still commanded to produce some power, even while braking. Manufacturers do this to keep catalytic converters warm and effective.

I prefer a vehicle that cuts fuel flow on throttle lift.

Try selecting neutral when decelerating. You might find that the engine is FAR above idle with the brakes applied. I find this annoying.
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#4575151 - 11/15/17 03:35 PM Re: Regenerative braking yay/nay? [Re: nthach]
ag_ghost Offline


Registered: 12/08/10
Posts: 618
Loc: SF Bay Area, CA
Originally Posted By: nthach
Unless Subaru installed some sort of KERS or the "mild" hybrid system off the XV Crosstrek Hybrid, I doubt you have any provision for regenerative braking.

The Forester's CVT control logic probably incorporates better hill sensing and will hold back a "range" or two to keep it going steady down hill. Most automatics/CVTs have grade logic control that theoretically helps going up and down hill. In my experience the system does work well in some but I've always had to manually shift the Subies I've driven to get some decent acceleration up and deceleration down.

FWIW, Our 2015 Honda CR-V with a CVT exhibits this behavior coming on significant inclines in the Bay Area. My wife and I really like it. The engine tach also seems to align with this system. I've driven a friend's Tesla Model S (now departed); THAT had regnerative braking on flat surfaces ... not trivial to acclimate imho.

Kevin
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Kevin
63 Galaxie 500, 390; dad bought it new...
99 Accord V6
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#4575162 - 11/15/17 03:46 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
Ethan1 Offline


Registered: 12/29/14
Posts: 1620
Loc: 'murica
I didn't even know there was a Forester hybrid shrug

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#4575177 - 11/15/17 03:52 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7397
Loc: S California
The 3rd gen company Prius in on the original brakes ad over 200K miles. It works just fine. Once in a while, you can feel it change over at just under 10 mph but it's not a problem. You can barely feel it if at all and then only once in a great while.

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#4575203 - 11/15/17 04:21 PM Re: Regenerative braking yay/nay? [Re: OneEyeJack]
TheKracken Offline


Registered: 04/18/17
Posts: 515
Loc: Fort Worth TX
Originally Posted By: OneEyeJack
The 3rd gen company Prius in on the original brakes ad over 200K miles. It works just fine. Once in a while, you can feel it change over at just under 10 mph but it's not a problem. You can barely feel it if at all and then only once in a great while.


My 2ed gen got it's first brake job at 238k miles. My 3ed gen is still on it's originals as well.
_________________________
2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles

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#4575215 - 11/15/17 04:34 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
gathermewool Offline


Registered: 01/09/09
Posts: 5883
Loc: New England
I think you mean engine-braking. One thing I LOVE about our Subies, is that they engine-brake well. Great for reducing gas consumption and brake wear.

Regenerative braking turns an electrical motor into a generator, so that the production of energy to refill the batteries causes the car to slow down, vice the brakes. This allows the car to slow down AND supply juice to the battery, extending the batteries range.
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14 Forester XT Touring w/ Eyesight (her)
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#4575231 - 11/15/17 04:49 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
EdwardC Offline


Registered: 11/14/13
Posts: 1820
Loc: Chicago, IL
The LEAF has two settings for the amount of regen when coasting. The newest 2018 LEAF is reported to have the capability to come to a complete stop, so you can essentially drive with just one foot on the gas pedal.

In the 'D' setting on my 2016 model, it will coast freely when the gas pedal isn't pressed, with very minimal regen. in the 'B' (brake?) mode, when I let off the gas, it'll slow down a lot more, regenerating much more power. If I'm in 'B' mode and want to decelerate slower, I'll press the throttle just a little bit and it'll coast more freely.

Regen doesn't have to be limited to a gas/electric hybrid, it conceptually just means that the kinetic energy is being stored for future use. Could be charging a battery, storing compressed air, spinning a flywheel, heating something up, etc.

Since the Forester doesn't appear to be a hybrid, my guess is that you're feeling the engine braking.

I might be wrong on this, but in the past, when coasting, the computer would have to put in some amount of throttle/fuel to keep the engine idling. Newer cars, in search of fuel economy, can completely shut down all fuel input, requiring the momentum of the car to keep the engine spinning while it effectively just compresses/pumps air. I believe this is what CuJet is saying.

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#4575234 - 11/15/17 04:53 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
MCompact Offline


Registered: 07/21/02
Posts: 4055
Loc: KY
I like the regenerative braking on our i3; you can almost drive with just one pedal. It also works pretty well on the BMW iPerformance PHEVs.
_________________________
Mine:
2014 M235i
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2016 i3 REX
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...

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#4575359 - 11/15/17 06:30 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
HangFire Offline


Registered: 08/21/13
Posts: 2505
Loc: Central Maryland
Originally Posted By: MoneyJohn
What do others feel about regenerative braking? What are the benefits that I have failed to realize?


One thing I've learned from driving many kinds and brands of cars, is that how one manufacturer tunes one model has little/nothing to do with another. For example when I first had a GM car automatic downshift to help me compression brake, I was shocked because I had driven mostly Ford automatics (which would have upshifted just to be obnoxious, because: Ford). My Toyota likes to coast forever, but if I ease on the brakes slightly, it'll downshift too. And Hyundai... who the heck knows what that transmission was going to do next.

Point being, it's not one "regenerative braking" feel across all so-equipped cars.
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#4575460 - 11/15/17 07:58 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
Nick1994 Offline


Registered: 02/19/13
Posts: 9817
Loc: Phoenix, AZ
I think in your case it's a CVT thing
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2015 Hyundai Sonata 2.4L 76k PU 5w30 & OEM
2000 Toyota Camry 2.2L 227k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 145k M1 HM 10w40 & Fram Ultra

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#4575477 - 11/15/17 08:12 PM Re: Regenerative braking yay/nay? [Re: MoneyJohn]
UncleDave Offline


Registered: 06/02/14
Posts: 1597
Loc: Ca.
My lexus transmission has an engine braking mode - more conducive to one foot driving with stronger regeneration and engine compression braking.

Interesting to note that its more efficient to practically coast under deceleration - than run in engine braking/ high regeneration mode.

UD
_________________________
Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C

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#4575553 - 11/15/17 09:35 PM Re: Regenerative braking yay/nay? [Re: UncleDave]
MCompact Offline


Registered: 07/21/02
Posts: 4055
Loc: KY
Originally Posted By: UncleDave
My lexus transmission has an engine braking mode - more conducive to one foot driving with stronger regeneration and engine compression braking.

Interesting to note that its more efficient to practically coast under deceleration - than run in engine braking/ high regeneration mode.

UD


When I put my 2 Series in Eco Pro mode the engine rpm drops to idle when coasting- down to @15 mph; I've found I can bump up my commuting fuel economy by 1-2 mpg depending on traffic.
_________________________
Mine:
2014 M235i
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2016 i3 REX
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...

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