Re: Regen breaking
From: Peter Pless (ferrarilistpless.com.au)
Date: Sun, 2 Dec 2018 15:28:54 -0800 (PST)

In the unlikely event that you’re right with the Volt, I would say that’s a HUGE oversight on the part of GM. Very hard to believe though.

 

From: Ferrari [mailto:ferrari-bounces+ferrarilist=pless.com.au [at] ferrarilist.com] On Behalf Of Hans E. Hansen
Sent: Monday, 3 December 2018 10:22 AM
To: Peter Pless
Cc: The FerrariList
Subject: Re: [Ferrari] Regen breaking

 

A few years back, this was a topic on some of the car forums.  Some were suggesting more complicated ways of finding out, like tapping into the light circuit or fuse box, or whatever.  But often there are simpler ways.  Hence the foil reflector.  Location of the Volt 3rd light makes it easy to fabricate a reflector that is visible in the mirror.

 

I get up to 50KW (~65hp) of regen with just lift-throttle on the highway, more like 40KW in town.  No brake lights.  A light press of the brake pedal increases regen to about 75KW (~100hp) - with the brake light on.  A further press energizes the friction brakes.  I hooked up a tester to the OBD port to see at what point the brake pedal is using regen only, and at what point the friction brakes start applying.  With practice, you can feel it in the pedal, although it is quite subtle.

 

Hans.

 

Hans.

 

On Sun, Dec 2, 2018 at 3:04 PM Clarence Romero Jr. <clyderomerof4 [at] gmail.com> wrote:

Well I have driven the Tesla and when you are off the gas the brake lights come on

 

 

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On Dec 2, 2018, at 5:58 PM, Hans E. Hansen <FList [at] hanshansen.org> wrote:

ABSOLUTELY WRONG!!!!

I taped a piece of foil near the center brake light on my Volt so I
could see it reflect in my rear view mirror.  Step on brakes, I can
see the light on.  Lift throttle (regen), NO LIGHT!

Next time you try and guess an answer, get a car and experiment first.

Hans.
On Sun, Dec 2, 2018 at 2:46 PM Peter Pless <ferrarilist [at] pless.com.au> wrote:

 

The brake lights most certainly come on when you use regen on an electric car. The fact that some of you thought that it was possible that they DON'T is astounding!

 

And then, once you've stopped, you can put your foot on the brake pedal so that the brake lights are on....just like in any other car.

 

-----Original Message-----

From: Ferrari [mailto:ferrari-bounces+ferrarilist=pless.com.au [at] ferrarilist.com] On Behalf Of jashburne--- via Ferrari

Sent: Wednesday, 28 November 2018 10:09 PM

To: Peter Pless

Cc: The FerrariList

Subject: Re: [Ferrari] Regen breaking

 

I’m surprised that the brake lights aren’t programmed to come on when the motor is actively slowing down the car. Sounds dangerous if not.

 

John

 

Sent from my iPhone

 

On Nov 27, 2018, at 12:30 PM, Hans E. Hansen <FList [at] hanshansen.org> wrote:

 

I wouldn't call it severe.  Think of the throttle (rheostat?) as

having a neutral position, which is part way down.  Push further, it

accelerates.  More push, more acceleration.  Lift throttle is similar.

Lift a little, gradual decel, etc.

 

As for the brake light issue, my recent Thanksgiving trip to Portland

gave me the opposite problem.  I was in stop and go congestion on I-5.

I'd lift to slow, but because the brake lights don't come on, cars

behind me had no idea that I had started slowing until it became very

obvious.  Given the congestion and that people tend to follow way too

close, I thought this could be dangerous, so I "shifted" into regular

"drive" (simulating a gas car with an auto trans) which forced me to

use the brake pedal to slow even slightly.  Thus lighting up the brake

lights and warning people behind me.

 

Hans.

On Sat, Nov 24, 2018 at 10:23 PM Peter Rychel <dino308gt4 [at] hotmail.com> wrote:

 

So, every time you let off the accelerator pedal, the regen kicks in and it’s that severe?

 

 

 

Peter

 

 

 

Sent from Mail for Windows 10

 

 

 

 

 

________________________________

From: Ferrari

<ferrari-bounces+dino308gt4=hotmail.com [at] ferrarilist.com> on behalf of

Hans E. Hansen <FList [at] hanshansen.org>

Sent: Saturday, November 24, 2018 9:49:45 AM

To: PeterGT4

Cc: The FerrariList

Subject: Re: [Ferrari] Regen breaking

 

FWIW, the regen in a Chevy Volt is fairly strong, strong enough that

I only use the brake (NOT break) pedal for the final 20 feet or so to

come to a complete stop in normal traffic.

 

Hans.

On Fri, Nov 23, 2018 at 11:22 PM Peter Rychel <dino308gt4 [at] hotmail.com> wrote:

 

How much drag does it feel when you lift off the accelerator pedal? Like, it’s going to come to a complete dead stop very, very quickly?

 

 

 

I wonder if cars like this (I’m talking street cars here, not F1) are designed for people who left-foot brake. Like maybe not such a dramatic lift-your-entire-foot-off-of-the-gas-pedal and then jamming on the brake, but a gentle relaxing on the “gas” and slightly pressing on the brake, more-or-less at the same time.

 

 

 

As the years pass and the manual transmission disappears off the road, nearly everyone are driving automatics now and I’ve noticed, especially with younger, newer drivers that they’re using their left feet for braking. How can I tell? From the continuous blinking of the brake lights, yet not noticeable drop in speed as they drive along a busy route. It’s not that they’re trying to slow down, but only moderate their speed as they go along. It’s incredibly annoying.

 

 

 

Peter

 

 

 

Sent from Mail for Windows 10

 

 

 

 

 

________________________________

From: Ferrari

<ferrari-bounces+dino308gt4=hotmail.com [at] ferrarilist.com> on behalf

of Stephen Sherman <stephensherman44 [at] gmail.com>

Sent: Friday, November 23, 2018 12:36:22 PM

To: PeterGT4

Cc: The FerrariList

Subject: [Ferrari] Regen breaking

 

I have learned what F1 drivers experience (not to the extent that F1 do) when the commentators talk regenerative breaking. In my Tesla ( standard regen ) I normally take my foot off the accelerator and the Tesla deaccelerates like I am braking. I am not sure if depends on the state of charge of the battery or the temperature or a combination of the two, but there is NO or not desernable regen braking. There is a message when I first start to drive that ‘regen braking is limited ‘, not after I have experienced full regen braking during my drive then when I take my foot off the accelerator NO regen. It would be nice to have the message ‘regen braking limited ‘ on the screen, so I would be braking harder. Just an observation.

 

Stephen L Sherman

Sent from my iPad Pro

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