--- In Prius_Technical_
>
>I am still trying to figure out what was wrong with the simple systems based on relative
tire rotation as sensed by the ABS? From all anecdotal reports I have heard, it worked just
fine. It also detected badly mismatched tires. It involved no extra components to pay for
or to go wrong. Best of all, there was no need for any extra attention or special knowledge
when changing between summer and winter wheels. I fear that the TPDs will lead to less
people bothering with winter tires which, in turn, will make many of the roads less safe for
all of us!
The story I heard, is that US regulations mandated the pressure sensor system on all new
cars. Any Idea why they'd select an expensive and touchy system over a proven, minimal
cost solution?
Andrew
> On Feb 8, 2008, at 12:13 PM, Robert J. Wilson wrote:
>
> > I'm not sure this the best approach. I agree a tire mounted,
> > piezoelectric beam will have plenty of energy, I prefer having a wheel
> > mounted sensor even if self-generated power is more of a problem.
> > Heck, even a tire valve stem makes more sense than loading a tire
> > casing with another part.
>
>
> I have long thought this would be a good problem for the optics guys
> to solve. Make a material that changes color with pressure. Mount in
> the rim with some of the material sticking out. Use a powered sensor
> to illuminate this stub and measure the color.
>
> Not a trivial task. Any material which changes color under pressure is
> likely to change color with temperature. Then there is the dirt issue.
>
> --
> David Kelly N4HHE, dkelly@...
>
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> Whom computers would destroy, they must first drive mad.
>
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