Device for detecting a bad road from a moving vehicle

Details Device for detecting a bad road from a moving vehicle Device for detecting a bad road from a moving vehicle

1988-04-15

1990-04-03

Raevis, Robert R.

Measuring and testing

Surface and cutting edge testing

Roughness

G01B 528

Patent

active

049129678

ABSTRACT:
A device for detecting a bad or bumpy road from a moving vehicle includes a plurality of wheel speed detectors for detecting the corresponding wheel speeds of a plurality of different wheels, an arithmetic circuit for calculating a difference between values detected in the individual wheel speed detectors, a filter, receiving outputs from the arithmetic circuit, for processing only components in a predetermined frequency band, and a determination circuit for determining if a vehicle is travelling on a bad road based on outputs from the filter. The device easily detects a bad road from a moving vehicle on the basis of outputs from said wheel speed detectors, without being affected by instantaneous variations in the wheel speeds.

REFERENCES:
patent: 3880118 (1975-06-01), Nims
patent: 4064844 (1977-12-01), Matsumoto et al.
patent: 4432430 (1984-02-01), Lind et al.
patent: 4721176 (1988-01-01), Kabasin et al.
patent: 4724939 (1988-02-01), Lockhart et al.
patent: 4733878 (1988-03-01), Kanazawa et al.

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