Tire pressure drop detecting device

Details Tire pressure drop detecting device Tire pressure drop detecting device

1998-02-26

1999-08-17

Barlow, John

Data processing: measuring, calibrating, or testing

Calibration or correction system

Pressure

702 96, 702140, 340442, 340443, 340444, 731462, 731464, 731465, B06C 2300

Patent

active

059407816

ABSTRACT:
An apparatus for detecting the drop in air pressure of any of tires mounted on a vehicle. The device finds, in finding an initial correction factor for eliminating the effect of a difference in effective rolling radius depending on an initial difference among the tires on the rotational angular velocities of the tires, the ratio of the rotational angular velocities of a predetermined pair of the tires as an initial correction factor, averaging and updating the initial correction factor for each sampling period, and taking the initial correction factor found when the number of times of the updation reaches a predetermined number of times as the final initial correction factor. When it is judged that the air pressure of any of the tires drops before the final initial correction factor is found, the calculation of the initial correction factor is stopped.

REFERENCES:
patent: 5578984 (1996-11-01), Nakajima
patent: 5591906 (1997-01-01), Okawa et al.
patent: 5629478 (1997-05-01), Nakajima et al.
patent: 5710539 (1998-01-01), Iida

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