[Quietcars] Regression testing 2010 Prius

[michael townsend]

Bob, I didn't see your message before Deb's comments, but I have questions.


What is the pump noise?  Is it the same as a gasoline engine's fuel
injection pump noise as a short burst, maybe listing a  couple of seconds?  

The other noises you refer to are generator noises?  

You must be assured that under a high traffic situation that these noises
couldn't be apparently heard over the noise of automobiles and trucks around
the hybrid, for they can't be tat loud.  The writer claims that he or "they"
are in a parking lot.  Is the parking lot deserted and is the Prius the only
vehicle moving at the time?  

If one is truly serious about this discovery and the noises emitted from the
Prius are that discernable, then, let's test the car n real world
conditions, in traffic, at stop lights with cars, trucks and other noises
abounding.  

Thanks for your observations.  I appreciate them, and whomever wrote the
original "loud noise" theories, please either address the list and give your
name, as I would like to find out more of how this study was undertaken.
Were you sequestered at a convention and was this a planned set up>?  

Thanks, Deb and bob for these comments.

Mike T in NJ.  

 

-----Original Message-----
From: quietcars-bounces at nfbnet.org [mailto:quietcars-bounces at nfbnet.org] On
Behalf Of Deborah Kent Stein
Sent: Tuesday, July 21, 2009 12:46 AM
To: Discussion of new quiet cars and pedestrian safety
Subject: Re: [Quietcars] Regression testing 2010 Prius



Thanks for these observations.  This is very interesting.

Debbie

----- Original Message -----
From: "Robert Wilson" <bwilson4web at hotmail.com>
To: <quietcars at nfbnet.org>
Sent: Monday, July 20, 2009 11:34 PM
Subject: [Quietcars] Regression testing 2010 Prius


>
> Hi,
>
> We picked up our 2010 Prius May 28 and have been doing some regression 
> testing to find out how it performs relative to our 2003 Prius. But today 
> I was reading a thread and saw these quotes:
>
> "At Hybridfest, a few of us were gathered in the parking lot. We were
> shuffling Prii. A 2010 stealthed by and Hobbit and I looked at each
> other. He said exactly what I was thinking: "dang the inverter on that
> thing is loud." I have witnessed the stealthing of hundreds of GenII
> and this GenIII was louder than any of them."
>
> My own observations, not quantified by sound level measurements, but from 
> having frequently swapped between our 2003 and 2010 Prius (we replaced the

> 2001 Echo):
>
> inverter 'sketer - I sometimes hear the faint, high-pitched whine at low 
> speedsbrake pump (?) - opening the door, I can hear a faint pump start 
> under the hood
> It is entirely possible that the 2010 makes a unique set of noise that are

> different from what we hear from the 2003. Others have also noticed a 
> difference with the inverter noise.
>
> The 2010 Prius has a redesigned inverter that brings the 200 VDC traction 
> battery up to 640 VDC. The higher voltage allows use of smaller motors of 
> greater power. But stepping up the voltage is not trivial and there may be

> stray fields inducing what we hear as the high-pitched whine. So far, no 
> one in the Prius community has tried to quantify the frequency or level. 
> But I've also noticed the 'pump' noise as I open the door even before 
> turning the car on.
>
> Our 2003 Prius has subtle noises that long term drivers eventually pick up

> and are valuable clues when diagnosing potential problems. But the 2010, a

> new model, appears to have changed the set of noises.
>
> Bob Wilson
>
>
>
>
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