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Automatic initialization method applied to device for detecting pneumatic abnormalities on the basis of variations in angular velocity of tire

  • US 5,724,266 A
  • Filed: 04/30/1996
  • Issued: 03/03/1998
  • Est. Priority Date: 12/21/1992
  • Status: Expired due to Term
First Claim
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1. An automatic initialization method in a device for detecting pneumatic abnormality of a tire on the basis of variations in angular velocity of the tire wherein angular velocities of tires are relatively compared with one another and if a predetermined difference exists an alarm for tire deflation is issued, comprising the steps of:

  • measuring and monitoring acceleration of a vehicle in a lateral direction,obtaining for each tire 1, 2, 3 and 4, under normal tire pressure, an angular velocity of rotation A, B, C and D, respectively and only using the data of angular velocity of rotation of each corresponding tire when the acceleration of the vehicle in the lateral direction ranges from -0.03 g to +0.03 g, andobtaining a correction value for each tire Ac, Bc, Cc and Dc from the angular velocity of rotation A, B, C and D of corresponding tire 1, 2, 3 and 4, respectively, on the basis of the following formulas;

    
    
    space="preserve" listing-type="equation">Ac=A/A
    
    
    space="preserve" listing-type="equation">Bc=A/B
    
    
    space="preserve" listing-type="equation">Cc=A/C
    
    
    space="preserve" listing-type="equation">Dc=A/Dwherein the device is so designed to relatively compare Ac×

    A'"'"';

    Bc×

    B'"'"';

    Cc×

    C'"'"' and Dc×

    D'"'"', A'"'"', B'"'"', C'"'"' and D'"'"' being defined as angular velocities of rotation detected for each corresponding tire, respectively, when the vehicle is running.

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