Pneumatic tire pressure change detecting system comparing wheel

Details Pneumatic tire pressure change detecting system comparing wheel Pneumatic tire pressure change detecting system comparing wheel

1994-09-19

1996-05-07

Chilcot, Richard

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340444, G01M 1702, E01C 2302

Patent

active

055135234

ABSTRACT:
A subtractor calculates an actual wheel speed difference between rotational speeds of left and right wheels on a motor vehicle, and a steering angle converter calculates an actual steering angle from the actual wheel speed difference. The difference between the actual steering angle and an adequate steering angle which is produced based on a lateral acceleration is compared with a predetermined reference range. If the difference between the actual and adequate steering angles exceeds the predetermined reference range, then the pneumatic pressure of a tire on one of the left and right wheels is determined as being lowered. In the steering angle converter, a weight value is established according to a running condition of the motor vehicle, and the calculated actual steering angle or comparative sensitivity is varied according to the weight value. Since the comparative sensitivity is varied according to the running condition, a reduction in the pneumatic pressure of the tire can be detected even under running conditions which lead to large errors.

REFERENCES:
patent: 5218862 (1993-06-01), Hurrell, II et al.

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