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Regenerative braking yay/nay? #4575096
11/15/17 03:59 PM
11/15/17 03:59 PM
Joined: Mar 2012
Posts: 200
Southern NY
MoneyJohn Offline OP
MoneyJohn  Offline OP
Joined: Mar 2012
Posts: 200
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
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575105
11/15/17 04:07 PM
11/15/17 04:07 PM
Joined: Dec 2003
Posts: 9,808
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,808
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


CX5 Touring 2.5L :-)
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575123
11/15/17 04:19 PM
11/15/17 04:19 PM
Joined: Jan 2004
Posts: 4,167
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,167
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.

Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575143
11/15/17 04:32 PM
11/15/17 04:32 PM
Joined: Feb 2003
Posts: 7,444
Jupiter, Florida
Cujet Online content
Cujet  Online Content
Joined: Feb 2003
Posts: 7,444
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.


People who count on their fingers should maintain a discreet silence.
Re: Regenerative braking yay/nay? [Re: nthach] #4575151
11/15/17 04:35 PM
11/15/17 04:35 PM
Joined: Dec 2010
Posts: 629
SF Bay Area, CA
ag_ghost Offline
ag_ghost  Offline
Joined: Dec 2010
Posts: 629
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


Kevin
63 Galaxie 500, 390; dad bought it new...
99 Accord V6
15 CR-V
04 Accord I4, MT(!)
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575162
11/15/17 04:46 PM
11/15/17 04:46 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
I didn't even know there was a Forester hybrid shrug

Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575177
11/15/17 04:52 PM
11/15/17 04:52 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
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.

Re: Regenerative braking yay/nay? [Re: OneEyeJack] #4575203
11/15/17 05:21 PM
11/15/17 05:21 PM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline
Joined: Apr 2017
Posts: 515
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
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575215
11/15/17 05:34 PM
11/15/17 05:34 PM
Joined: Jan 2009
Posts: 6,206
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,206
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.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575231
11/15/17 05:49 PM
11/15/17 05:49 PM
Joined: Nov 2013
Posts: 1,917
Chicago, IL
EdwardC Offline
EdwardC  Offline
Joined: Nov 2013
Posts: 1,917
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.

Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575234
11/15/17 05:53 PM
11/15/17 05:53 PM
Joined: Jul 2002
Posts: 4,402
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,402
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:
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575359
11/15/17 07:30 PM
11/15/17 07:30 PM
Joined: Aug 2013
Posts: 2,531
Central Maryland
HangFire Offline
HangFire  Offline
Joined: Aug 2013
Posts: 2,531
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.


Various musings: http://hangfire.net
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575460
11/15/17 08:58 PM
11/15/17 08:58 PM
Joined: Feb 2013
Posts: 10,719
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,719
Phoenix, AZ
I think in your case it's a CVT thing


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Regenerative braking yay/nay? [Re: MoneyJohn] #4575477
11/15/17 09:12 PM
11/15/17 09:12 PM
Joined: Jun 2014
Posts: 1,776
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,776
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
Re: Regenerative braking yay/nay? [Re: UncleDave] #4575553
11/15/17 10:35 PM
11/15/17 10:35 PM
Joined: Jul 2002
Posts: 4,402
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,402
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:
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...
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