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EV's Too Quiet ?!

Posted: Mon May 03, 2010 4:51 pm
by sjfotos
Seems like an outstandingly poor use of acoustic engineering.....

http://www.theaustralian.com.au/news/ex ... 5861879533

Re: EV's Too Quiet ?!

Posted: Mon May 03, 2010 5:26 pm
by EVDRIVER
There are more intelligent ways to address this issue and making an excuse for more noise pollution rather than removing it is the typical knee jerk response one would expect from interest groups and politicians. There seems there would be many creative business opportunities to selectively introduce warnings without constant noise everywhere.

Re: EV's Too Quiet ?!

Posted: Mon May 03, 2010 6:22 pm
by palmermd
This is ridiculous. When a vehicle is moving at traffic speeds the largest sound generator is the tire noise. Many modern cars make more tire noise than engine noise when traveling at speeds over 25mph. Are we going to put these noise generators on all the cars that don't meet a noisy engine requirement? When traveling at speeds below 25mph the driver should have some responsibility to look out for pedestrians. I've been driving an EV for 15 years and have not had any problem with people not knowing that my car is running and moving except for a few times in parking lots where a little "excuse me" out the window has been more than enough to let the person know that I was trying to pass.

Re: EV's Too Quiet ?!

Posted: Mon May 03, 2010 9:47 pm
by darelldd
As the EV1 had, so will the Volt: A simple warble tone actuated by pulling the high-beam stalk toward you. Simple. Effective. All that is ever needed. Other car makers would do well to pay attention. But the law makers seem hell-bent on adding this artificial stumbling block to EVs. The first time an EV runs over a blind person, all hell is gonna break loose. OK to kill ten's of thousands of people with gasoline combustion, certainly. But don't kill any blind people with quite cars, please!

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 8:11 am
by EVDRIVER
darelldd wrote:As the EV1 had, so will the Volt: A simple warble tone actuated by pulling the high-beam stalk toward you. Simple. Effective. All that is ever needed. Other car makers would do well to pay attention. But the law makers seem hell-bent on adding this artificial stumbling block to EVs. The first time an EV runs over a blind person, all hell is gonna break loose. OK to kill ten's of thousands of people with gasoline combustion, certainly. But don't kill any blind people with quite cars, please!
It's a complete joke and 100 steps backward. Put sensors in walking canes that trigger noise and get stupid people without disabilities to pay attention. I think bikes and runners need noise makes as well, and wheel chairs of course. Noise is also a form of pollution but I guess that would require common sense. Anyone interested in buying fake tailpipe kits for their ev? If the Leaf had this Lise I would just install a hidden switch to turn it off.

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 11:27 am
by sjfotos
I agree EVDRIVER. It does not seem to me that we have a shortage of noise in this world!

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 1:21 pm
by garygid
We already had to defeat one such "noisemaker" related bill here in CA.

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 4:28 pm
by Rat
The right solution is probably to have a two-tone horn, or two "horns". One tone is a normal car horn subject to all the usual rules and restrictions on horns, the other the pedestrian warning noise (e.g. engine hum) that is softer and projected frontward as described, but only when activated by the driver, not on all the time. This second tone would not trigger a ticket the way leaving your regular horn on would. The second tone could be on the same button or stalk or a separate one. Maybe left foot "dimmer switch" position would be good since there is no clutch. It would switch to the regular horn if you're traveling more than the speed determined to be where the tire noise is already loud enough to warn nearby pedestrians. That is, if you're traveling 50 MPH and need to warn a pedestrian of your approach beyond what the tire and wind noise is, you need a real horn, not a soft little engine hum, so if you hit either button the regular horn would sound. I agree that requiring constant low noise is a ridiculous waste of electric power and may be an annoyance from a sound standpoint, but at least for the latter I think the soft tones they are talking about would not, or at least should not if made soft enough, bother the car occupants or anyone more than a few feet in front of the car. Fears of noise pollution are probably overblown.

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 5:23 pm
by palmermd
Rat wrote:The right solution is probably to have a two-tone horn, or two "horns". One tone is a normal car horn subject to all the usual rules and restrictions on horns, the other the pedestrian warning noise (e.g. engine hum) that is softer and projected frontward as described, but only when activated by the driver, not on all the time. This second tone would not trigger a ticket the way leaving your regular horn on would. The second tone could be on the same button or stalk or a separate one. Maybe left foot "dimmer switch" position would be good since there is no clutch. It would switch to the regular horn if you're traveling more than the speed determined to be where the tire noise is already loud enough to warn nearby pedestrians. That is, if you're traveling 50 MPH and need to warn a pedestrian of your approach beyond what the tire and wind noise is, you need a real horn, not a soft little engine hum, so if you hit either button the regular horn would sound. I agree that requiring constant low noise is a ridiculous waste of electric power and may be an annoyance from a sound standpoint, but at least for the latter I think the soft tones they are talking about would not, or at least should not if made soft enough, bother the car occupants or anyone more than a few feet in front of the car. Fears of noise pollution are probably overblown.
It sounds like the EV1 already had this. I agree it should be the drivers responsibility to warn pedestrians and to look out for them whether in an ICE or an EV.
darelldd wrote:As the EV1 had, so will the Volt: A simple warble tone actuated by pulling the high-beam stalk toward you. Simple. Effective. All that is ever needed. Other car makers would do well to pay attention. But the law makers seem hell-bent on adding this artificial stumbling block to EVs. The first time an EV runs over a blind person, all hell is gonna break loose. OK to kill ten's of thousands of people with gasoline combustion, certainly. But don't kill any blind people with quite cars, please!

Re: EV's Too Quiet ?!

Posted: Tue May 04, 2010 5:39 pm
by LTLFTcomposite
OK, try this on for size...

First off, the noise generator is only applicable at low speeds, no? You know, city driving, cars turning corners, approaching crosswalks, navigating parking lots, maybe backing up. Right? So to begin with, the noise generator would be speed sensitive. Above say, 25-30, it shuts off. At slow speeds, you could select what you want your car to sound like. Depending on my mood, mine will be either "Gulfstream V taxiing" or "Model T". If I were 30 years younger it would "67 Mustang"... a total chick magnet!