[Quietcars] Regression testing 2010 Prius

[Deborah Kent Stein]

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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