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Originally Posted by grease
Interesting our 2006 BMW 530i tire pressure monitoring system monitors the RPMs of each of the four wheels. When one of the wheel's rpms drops due to a change in rolling radius (relative to the others), it indicates a tire pressure drop and the alarm light comes on.
This is a very practical method for monitoring tire pressure change since RPMs at each wheel are monitored anyway for ABS.
Surprised other mfgrs do this any differently. 
Best regards,
Gordie
Austin, TX |
Hi,
No offense, But I'm not sure I buy this. I may simply not understand it.
A system which can measure the minute differences in tire circumference of a couple PSI would be pretty sensitive stuff. But, there are other things which effect the tires circumference such as Tread Wear, Ambient Temperature, Running Temperature and even Barometric Pressure and/or Altitude. Even the Brand of Tire has an effect because there is some variation in the Circumference of a certain size Tire between Brands. That would mean such a Monitoring System would need to sense and eliminate the effect of these variables as well.
Maybe you can enlighten me. Thanks, I look forward to your reply...
Happy Motoring!...Jim'99