Patent ID: 6449582
Filing Date: 2002-09-10
Classification: B60C,G01G

Abstract:
A method for measuring the weights of a vehicle based on change in tire pressure comprising, measuring tire pressure and temperature of at least a significant number of tires on a vehicle, determining a temperature standardized pressure P(S) based on a selected standard temperature for each tire, totaling said temperature standardized pressures for said tires P(S)TOTAL and determining total weight WTOTAL of said vehicle based onWTOTAL=CF(&Dgr;P(S)TOTAL) Where WTOTAL total weight of said vehicle&Dgr;P(S)TOTAL=total or summation of all of said temperature standardized tire pressures P(S) less the summation PI(S)TOTAL of the initial tire pressures PI measured with no load on the tires converted to temperature standardized pressures PI(S) and summed to provide a summation of initial pressures PI(S)TOTAL CF=a conversion factor in weight/unit change of standardized tire pressures and wherein said total weight WTOTAL of a vehicle including cargo load if any is based on the equation CFT&Dgr;P(ST)TOTAL=CF1(&Dgr;P(S1))+CF2(&Dgr;P(S2))+CF3(&Dgr;P(S3))+ - - - +CFn(&Dgr;P(Sn)) Where &Dgr;P(ST)TOTAL the sum or the total of the temperature corrected changes in all the individual tire pressures.CFT=a conversion factor based on change in weight/unit change of standardized tire pressures based on the weighted average of CF1, CF2, CF3 - - - CFn and is in effect equivalent to CFT=[(CF1 (&Dgr;P(S1))+CF2 (&Dgr;P(S2))+CF3 (&Dgr;P(S3))+ - - - +CFn (&Dgr;P(Sn))]/&Dgr;P(ST)TOTALCF1, CF1, CF2, CF3 - - - CFn are predetermined specific values of a conversion factor CF for each of the tires 1, 2, 3 - - - n respectively.