Device for detecting a bad road from a moving vehicle
First Claim
1. A device for detecting irregular road from a moving vehicle, comprising:
- a plurality of wheel speed detectors for detecting corresponding wheel speeds of a plurality of wheels of the vehicle;
an arithmetic circuit for calculating the difference between wheel speeds detected by the individual wheel speed detectors;
a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and
a determination circuit means, receiving said filter output, for determining if the vehicle is travelling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof.
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Accused Products
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.
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Citations
9 Claims
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1. A device for detecting irregular road from a moving vehicle, comprising:
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a plurality of wheel speed detectors for detecting corresponding wheel speeds of a plurality of wheels of the vehicle; an arithmetic circuit for calculating the difference between wheel speeds detected by the individual wheel speed detectors; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is travelling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for detecting an irregular road from a moving vehicle, comprising:
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a wheel speed detector for detecting a wheel speed of the vehicle, an arithematic circuit for eliminating from the output of the wheel speed detector an amount corresponding to a vehicle speed; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is travelling on an irregular road, in response to the filter output, and outputting a signal indicative thereof.
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9. A device for detecting an irregular road from a moving vehicle, comprising:
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wheel speed detector for detecting a wheel speed of the vehicle; a wheel speed variation detecting means for detecting a variation in the level of an output from the wheel speed detector; a reference value generating means for generating a reference value variable in response to a vehicle speed; and a detecting means for detecting a road surface to be irregular when the output from the wheel speed variation detecting means is greater than the reference value fed from the reference value generating means.
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Specification