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From: Davoud on 14 Mar 2010 19:13
Chas Gill:

> As I understand it (and have experienced on a 2005 and 2010) B only acts as
> a engine brake when the accelerator is NOT in use. As soon as it is, B is
> disengaged and the engine acts normally.

Not saying you're wrong, but that's not the way it works on my '06. If
I forget to shift into D after using B to slow for a traffic signal
(e.g.) the car will accelerate away from the signal still in B. I can
feel the drag, so I have never left it in B long.

Davoud

--
I agree with almost everything that you have said and almost everything that
you will say in your entire life.

usenet *at* davidillig dawt cawm
From: Daniel who wants to know on 14 Mar 2010 21:21
"Chas Gill" <Chas.Gill(a)gollum.btinternet.com> wrote in message
news:Dc6dnXE5fvDYJgHWnZ2dnUVZ8rGdnZ2d(a)bt.com...
>
> Does anyone know exactly what this software upgrade does? I confess I've
> had no problems with my 2010 in this area but I also suspect that there
> might be a down side to the upgrade which might, in the long term, cause
> me to regret having it done.

For the ZVW30 (2010-...) Prius the software update fixes a .8 (eight tenths)
second braking lapse where the car coasts when transitioning from regen to
friction braking during an event that causes the ABS to kick in. So say you
are braking toward a red light and a wheel crosses a rough or slick spot
such as a pothole, sand, ice, or a wet manhole cover which causes a wheel
speed variation that triggers the ABS. The regen drops out and .8 seconds
later the friction brakes kick in.


From: Al Falfa on 14 Mar 2010 22:36


"Elmo P. Shagnasty" <elmop(a)nastydesigns.com> wrote in message
news:elmop-C4C701.21462014032010(a)news.eternal-september.org...
> In article <hnk21t$p6t$1(a)news.eternal-september.org>,
> "Daniel who wants to know" <me(a)here.edu> wrote:
>
>> For the ZVW30 (2010-...) Prius the software update fixes a .8 (eight
>> tenths)
>> second braking lapse where the car coasts when transitioning from regen
>> to
>> friction braking during an event that causes the ABS to kick in. So say
>> you
>> are braking toward a red light and a wheel crosses a rough or slick spot
>> such as a pothole, sand, ice, or a wet manhole cover which causes a wheel
>> speed variation that triggers the ABS. The regen drops out and .8
>> seconds
>> later the friction brakes kick in.
>
> ...something that happens on the previous gen Prius as well, but which
> no one really cares about...

It's noticeably different in the 2010. Have you experienced this in a 2010?
You are slowing toward a stop, hit a bump, and suddenly you have no brakes
at all. Press harder on the pedal and you have brakes again. The Gen 2
doesn't behave this way and it is this behavior the TSB addresses.




From: Chas Gill on 15 Mar 2010 05:16

"Al Falfa" <crop(a)eastforty.fld> wrote in message
news:4b9d9d2c(a)newsgate.x-privat.org...
>
>
> "Elmo P. Shagnasty" <elmop(a)nastydesigns.com> wrote in message
> news:elmop-C4C701.21462014032010(a)news.eternal-september.org...
>> In article <hnk21t$p6t$1(a)news.eternal-september.org>,
>> "Daniel who wants to know" <me(a)here.edu> wrote:
>>
>>> For the ZVW30 (2010-...) Prius the software update fixes a .8 (eight
>>> tenths)
>>> second braking lapse where the car coasts when transitioning from regen
>>> to
>>> friction braking during an event that causes the ABS to kick in. So say
>>> you
>>> are braking toward a red light and a wheel crosses a rough or slick spot
>>> such as a pothole, sand, ice, or a wet manhole cover which causes a
>>> wheel
>>> speed variation that triggers the ABS. The regen drops out and .8
>>> seconds
>>> later the friction brakes kick in.
>>
>> ...something that happens on the previous gen Prius as well, but which
>> no one really cares about...
>
> It's noticeably different in the 2010. Have you experienced this in a
> 2010? You are slowing toward a stop, hit a bump, and suddenly you have no
> brakes at all. Press harder on the pedal and you have brakes again. The
> Gen 2 doesn't behave this way and it is this behavior the TSB addresses.
>
>
>
>
Which raises the secondary questions: -

1. What purpose was intended to be served by the original 0.8 sec delay
which, I presume, was seen as an improvement over Gen 2?

2. Will this software mod - in the long term - affect the overall fuel
economy/brake life/any number of other things that I can't immediately think
of?

Chas

From: ransley on 15 Mar 2010 10:30
On Mar 14, 6:11 pm, Davoud <s...(a)sky.net> wrote:
> Chas Gill:
>
> > > Does anyone know exactly what this software upgrade does?  I confess I've
> > > had no problems with my 2010 in this area but I also suspect that there
> > > might be a down side to the upgrade which might, in the long term, cause me
> > > to regret having it done.
>
> ransley:
>
> > I bet if its upgraded its fine, Toyota wont ever tell because of
> > liability what it does. The less lawyers know the less they have to
> > work with.
>
> Also doubt the moon landings, do you? Toyota told the Congress, the
> NTSB, and the public what the software update does -- it turns off the
> fuel supply if the brake is applied at the same time the accelerator
> pedal is depressed.
>
> Davoud
>
> --
> I agree with almost everything that you have said and almost everything that
> you will say in your entire life.
>
> usenet *at* davidillig dawt cawm

No idiot, we landed on the moon, it will all come out in time on the
tododa cars, and yes elvis is dead.
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