From: Tomes on 8 Jul 2007 23:11
"Jeff" <kidsdoc2000(a)hotmail.com> wrote in message
> Elmo P. Shagnasty wrote:
>> In article <1ljt835qscr7uv0pjg4h31coeti2t5pefl(a)4ax.com>,
>> "Bonehenge (B A R R Y)" <DwightSchrute(a)DunderMifflin.com> wrote:
>>>> With those electric motors there to help with low end grunt and
>>>> getting the car moving, the engine can be tuned more specifically for
>>>> running at certain efficient speeds.
>>> I always thought electric motors would make AWD very simple.
>> They do. Someone's doing that today.
> Who? Just curious.
Toyota Highlander Hybrid.
From: Tomes on 8 Jul 2007 23:24
> Tomes :
>> The Prius uses a thermos to where it pumps a good percentage of the
>> engine coolant when the vehicle is turned off (keeps it warm for when
>> car is restarted without much of a delay). That is what the whirring
>> sound is at that point, and why there is about a 5 second delay upon
>> turn-on before the engine turns on (it pumps the fluid back into the
>> engine system). Once the car is running, it does not pump it to that
>> thermos, as the engine must reengage instantly when needed. Tomes
> I wondered what that was ;-) The neighbor has a Prius. I noticed that
> "started" with no engine, but as she was moving away, the engine came
> I thought she had just pressed on the gas a little too hard. I presume
> that the engine would have shut down again a few seconds later. The
> is so quiet at low demand that it's hard to tell if it's running from a
> distance of more than a few feet, another plus of hybrid technology for
> little motors. The cars can ooze away from a stop, up to 20mph or more,
> with the engine turning 1500rpm for nominal acceleration.
Yep, the engine would have shut down about a minute later, if it was not
needed for propulsion purposes. I like to make sure that I back out of
the garage before the gas engine comes on, just to get that little bit of
electric usage at that point. Not that it makes any difference in the
long run, but I just like to do it.
The engine always runs at one constant RPM (~3500 rpm) because that is
where it is most efficient. It then uses the CVT to constantly change the
gearing ratio to adjust the speed.
You can read a lot more about it here:
From: Tomes on 8 Jul 2007 23:27
> "C. E. White" :
>> I wonder why they don't use one of the heat storage devices to keep
>> the water warm so they don't have to run the IC engine just to warm
>> the water back up
> On the North American Toyota Prius, there is the Coolant Heat Storage
> System (CHHS). It's a small thermos-like device (actually designed by
> a Japanese rice-cooker company!) that stores some of the hot engine
> coolant when the car is turned off, and then will re-insert this hot
> coolant when the car is started, so that the car has hot coolant and
> the engine doesn't have to run as long at startup to get to proper
> operating temperatures. The stored coolant stays at temperature for
> well over a week.
I did not realize that it held this temperature for quite so long. How
about that. By the way, it stores about 3 liters of coolant into that
From: mrv on 9 Jul 2007 01:04
On Jul 8, 11:27 pm, "Tomes" <a...(a)here.net> wrote:
> <m...(a)kluge.net>...> "C. E. White" :
> > On the North American Toyota Prius, there is the Coolant Heat Storage
> > System (CHHS). It's a small thermos-like device (actually designed by
> > a Japanese rice-cooker company!) that stores some of the hot engine
> > coolant when the car is turned off, and then will re-insert this hot
> > coolant when the car is started, so that the car has hot coolant and
> > the engine doesn't have to run as long at startup to get to proper
> > operating temperatures. The stored coolant stays at temperature for
> > well over a week.
> I did not realize that it held this temperature for quite so long. How
> about that. By the way, it stores about 3 liters of coolant into that
I mis-remembered the timing. 8(
claims up to 3 days.
lists some temperatures, as well as the 3 day statement.
and you are correct, it is a 3 liter stainless steel dual vaccuum
flask. The 2004 Toyota New Car Features manual on the Prius, page
EG-4, does describe it as a similar construction as a household
From: dold on 9 Jul 2007 01:51
In alt.autos.ford Tomes <askme(a)here.net> wrote:
> You can read a lot more about it here:
The john1701a.com site is full of good information.
Some of the information applies to the Ford Escape Hybrid as well.
The two neighbors that I have might be typical of Prius owners far removed
from "John". They don't know much about their cars technically, have never
offered to take me for a ride just to show off, and have even said some
things that I am fairly sure aren't true. Next time one of those pops up,
I might revisit John1701a. ;-)
One bought the car to be green, and really mean it, not to show off to
anyone, as nearly as I can tell. The other just went for the mileage,
without real consideration of the costs.
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5