Tire pressure-reduction determining system for wheels of a vehic

Details Tire pressure-reduction determining system for wheels of a vehic Tire pressure-reduction determining system for wheels of a vehic

1996-10-09

1998-05-05

Oen, William L.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340444, B60C 2300, F02D 2902

Patent

active

057476861

ABSTRACT:
A reduction in pressure in tires fitted to follower wheels and driven wheels is precisely determined irrespective of slipping states of the driven wheels. A driven wheel slip rate calculating means M1 calculates driven wheel slip rates .lambda.L and .lambda.R. A driven wheel torque calculating means M2 calculates a driven wheel torque TQDW. A driven wheel slip rate estimating means M4 estimates a characteristic of variation in driven wheel slip rates .lambda.L and .lambda.R relative to the variation in driven wheel torque TQDW using a least squares method. A rotation-number ratio calculating means M5 calculates ratios CVWL and CVWR of the numbers of rotations of the follower wheels to the numbers of rotations of the driven wheels in a state in which the driven wheel torque in a graph of the variation characteristic is equal to zero. A tire pressure-reduction determining means M6 then determines a reduction in pressure from a difference in diameter between the follower wheels and the driven wheels by comparing the rotation-number ratios CVWL and CVWR with a reference value.

REFERENCES:
patent: 5327346 (1994-07-01), Goodell
patent: 5343741 (1994-09-01), Nishihara et al.
patent: 5561415 (1996-10-01), Dieckmann
patent: 5583483 (1996-12-01), Baumann

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