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Automatic tire pressure monitoring system

  • US 4,157,530 A
  • Filed: 12/18/1975
  • Issued: 06/05/1979
  • Est. Priority Date: 12/18/1975
  • Status: Expired due to Term
First Claim
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1. A system for monitoring a source of tire pressure on a vehicle to provide substantially no signal change within a predetermined range of satisfactory tire operating pressure, a rapidly changing signal when tire pressure falls below said pressure range and a different rapidly changing signal when tire pressure exceeds said pressure range comprising:

  • a pressure responsive actuator having a movable member,means for moving said member rapidly toward said source of said tire pressure when said pressure falls below said range and to move rapidly away from said source when said pressure exceeds said range, said last named means having a dead band of substantially no movement when said pressure is within said predetermined range of satisfactory tire operating pressure,biasing means urging said member toward said source of said tire pressure,sensing means for sensing the rapid movement of said member and the direction of said movement, said sensing means having an output, andmeans for displaying the output of said sensing means to the operator of said vehicle.

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