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On-board tire pressure indicating system

  • US 4,807,468 A
  • Filed: 03/17/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 03/17/1987
  • Status: Expired due to Fees
First Claim
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1. A system for providing inflation pressure information from a rotating pneumatic tire comprising means defining a reference dimension which is of circumferential extent and which rotates with the tire, means, related to inflation of the tire, defining an inflation measurement dimension which is of circumferential extent which rotates with the tire and sensor means including a Hall effect sensor which does not rotate with the tire and which is disposed in sensing relationship to the first-mentioned means and the second-mentioned means, said sensor means further comprising means for sensing via said Hall effect sensor said reference dimension, means for sensing via said Hall effect sensor said measurement dimension, and means for correlating the sensed measurement and reference dimensions to provide inflation pressure information for the tire.

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