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Posted by Ike on June 27, 2008, 10:55 pm
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Ike wrote:
> The Prius compressor is motor-driven, but is that motor powered by 12V?
> Traction battery dc? Inverter output ac? Because it dissipates
> considerable power, it would be more efficient to run it from HIGH
> voltage, and probably ac after the inverter.
>
> Ike
I just realized -- even a high efficiency compressor
(vane, scroll) would require at least a 500W motor, so
at 12V that would take more than 40 amps. It has to be
high voltage.
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Posted by Diako on June 28, 2008, 5:02 am
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> Ike wrote:
>
>> The Prius compressor is motor-driven, but is that motor powered by 12V?
>> Traction battery dc? Inverter output ac? Because it dissipates
>> considerable power, it would be more efficient to run it from HIGH
>> voltage, and probably ac after the inverter.
>>
>> Ike
>
>
> I just realized -- even a high efficiency compressor (vane, scroll) would
> require at least a 500W motor, so at 12V that would take more than 40
> amps. It has to be high voltage.
This can be useful:
http://www.epa.gov/cppd/Presentations/Matsunaga%20electric%20inverter.pdf
Diako
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Posted by Elmo P. Shagnasty on June 27, 2008, 9:12 pm
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> a fuel burner uses the drive belt from the crank to turn the a/c compressor
> at all times a/c is requested..........what system does the prius use to
> run a compressor at all times since the gas side shuts off so
> often?
The same system that your house uses.
Electricity.
The battery drives the AC system. If the battery gets low, the engine
does whatever it needs to do at the time to charge the battery up so
that it can continue to run the AC system.
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Posted by Michelle Vadeboncoeur on June 28, 2008, 7:57 am
Please log in for more thread options > a fuel burner uses the drive belt from the crank to turn the a/c compress=
or
> at all times a/c is requested..........what system does the prius use to
> run a compressor at all times since the gas side shuts off so
> often?.....TIA, bill
short answer: The Prius will cycle the AC compressor on and off as
needed, keeping the fan on. The passenger requested temperature comes
first. (Besides, the hybrid battery operates best at what humans
consider "room temperature," so the cabin air is blown over the hybrid
battery (which is located behind the passenger compartment).
On the NHW11 Prius (2001-2003 "Classic" sedan), like with most other
cars the AC compressor is directly powered by a belt off of the
gasoline engine. For the AC compressor to run, the gasoline engine
will also run. (So, in the heat of summer, the engine may come on
more often than otherwise just to power the AC compressor.) However,
unless you have the front windshield defroster/defogger position
selected or the MAX AC button pressed, the AC compressor does not run
full-time/constantly (the ICE always on). (The front windshield
defroster uses the AC compressor to dehumidify the air blown at the
windshield, and that AC use gets its power from somewhere (and doesn't
light the AC light to tell you the AC is being used)...) The AC
compressor may be used if you have the AC button on, but not always.
If at a stoplight, for example, and the cabin is already at/near the
desired cool temperature, the ICE will still shut down, and the fans
will continue to blow the remaining cold air into the cabin. When the
air being blown into the cabin or the cabin itself gets too warm, the
ICE may turn on (even while the car is stopped/idle) just to power the
AC compressor. The AC compressor/ICE will cycle on/off as needed to
maintain the coolness of the cabin.
On the NHW20 Prius (2004-current hatchback), the AC compressor is
electrically driven by power from the hybrid traction battery. So,
the gasoline engine is not required to power the AC compressor.
However, should the charge of the hybrid traction battery become too
low (say from a long time stopped while the AC is on), the gasoline
engine will be restarted just to recharge the battery. But the ICE
use is independent of the AC.
See http://priusonline.com/viewtopic.php?t=3D10274 for more info on the
electric AC.
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Posted by Pete Granzeau on June 28, 2008, 1:18 pm
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>a fuel burner uses the drive belt from the crank to turn the a/c compressor
>at all times a/c is requested..........what system does the prius use to
>run a compressor at all times since the gas side shuts off so
>often?.....TIA, bill
An electric motor, drawing power from the traction battery. The 12V
system is much too weak to power an A/C system for any length of time.
If the A/C draws down the traction battery, eventually the engine will
be started up to recharge the traction battery and provide power to the
A/C motor.
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