Tire air pressure detecting device

Details Tire air pressure detecting device Tire air pressure detecting device

1993-10-08

1996-03-12

Chilcot, Richard

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340448, B60C 2300, B60C 2302

Patent

active

054976570

ABSTRACT:
It is an object of the present invention to detect a tire air pressure indirectly with high detection precision.
A tire air pressure detecting device includes a speed sensor for outputting a signal corresponding to a rotational speed of a tire, and an electronic control unit which inputs the signal from the speed sensor and performs predetermined arithmetic operations on that signal. The electronic control unit calculates a wheel speed based on the output signal of the speed sensor, performs a frequency analysis for the calculated vehicle speed, and derives a resonance frequency corresponding to the unsprung mass in the vertical and longitudinal directions. The tire air pressure is then detected based on this resonance frequency.

REFERENCES:
patent: 3815407 (1974-06-01), Lavery
patent: 4254398 (1981-03-01), Matsuda et al.
patent: 4300118 (1981-11-01), Matsuda et al.
patent: 4574267 (1986-03-01), Jones
patent: 4630470 (1986-12-01), Brooke et al.
Patent Abstract of Japan, vol. 11, No. 380, Dec. 11, 1987.
Patent Abstract of Japan, vol. 10 No. 41, Feb. 18, 1986.
Patent Abstract of Japan, vol. 12 No. 227, Jun. 28, 1988.

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