Wheel pressure-reduction determining system for vehicle

Details Wheel pressure-reduction determining system for vehicle Wheel pressure-reduction determining system for vehicle

1996-10-09

1999-02-02

Biegel, Ronald L.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340443, 701 29, B60C 2300, F02D 2902

Patent

active

058668128

ABSTRACT:
A reduction in tire pressure in follower wheels and driven wheels is precisely determined irrespective of slipping states of the driven wheels through the use of apparatus wherein in a driven wheel slip amount calculating means M4 calculates a driven wheel slip amount KIDD as a left and right follower wheel speed difference FID and a left and right driven wheel speed difference RID; in a driven wheel torque calculating means M5, a driven wheel torque TQDW is calculated; in a driven wheel slip amount estimating means M6, a characteristic of variation in driven wheel slip amount KIDD relative to the variation in driven wheel torque TQDW is estimated using a least squares method; in a deviation calculating means M7, a deviation CKID between the follower wheel speed difference FID and the driven wheel speed difference RID in a state in which the driven wheels are not slipping, is calculated as an intercept of the driven wheel slip amount KIDD at a driven wheel torque equal to 0 (zero) in a graph of the variation characteristic; and in a wheel pressure-reduction determining means M8, a reduction in tire pressure is determined from a difference in diameter between the follower wheels and the driven wheels by comparing the deviation CKID with a reference value.

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European Search Report for European Patent Application No. EP 96 11 6335 dated Jan. 22, 1997.

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