Method and apparatus for detecting decrease in tire air-pressure, and selecting program for thresholds for judging decompression of tire
First Claim
1. A method for detecting decrease in tire air-pressure for detecting decrease in internal pressure of a tire on the basis of rotational information obtained from tires attached to a vehicle, wherein a threshold for judging decrease in air-pressure of following wheels is different from a threshold for judging decrease in air-pressure of driving wheels.
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Abstract
A method for detecting decrease in tire air-pressure for detecting decrease in internal pressure of a tire on the basis of rotational information obtained from tires attached to a vehicle. A threshold for judging decrease in air-pressure of following wheels is different from a threshold for judging decrease in air-pressure of driving wheels. Threshold for judging abnormalities in air-pressure are varied for judging abnormalities of tire air-pressures of following wheels and for judging abnormalities of tire air-pressure of driving wheels so that appropriate judgment of abnormalities in air-pressure can be performed.
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Citations
4 Claims
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1. A method for detecting decrease in tire air-pressure for detecting decrease in internal pressure of a tire on the basis of rotational information obtained from tires attached to a vehicle, wherein a threshold for judging decrease in air-pressure of following wheels is different from a threshold for judging decrease in air-pressure of driving wheels.
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2. An apparatus for detecting decrease in tire air-pressure for detecting decrease in internal pressure of a tire on the basis of rotational information obtained from tires attached to a vehicle, comprising:
- a rotational information detecting means for detecting rotational information of respective tires;
a steering angle detecting means for detecting a steering angle;
a memory means for storing the rotational information of the respective tires and the steering angle;
a straight-ahead drive judging means for judging, based on the steering angle, whether the vehicle is performing straight-ahead driving;
a turning radius calculating and processing means for calculating a turning radius on the basis of the rotational information of the tires;
a comparing and determining means for determining, on the basis of the turning radius as calculated by the turning radius calculating and processing means, whether the vehicle is performing straight-ahead driving or not in case it has been determined on the basis of the steering angle that the vehicle is performing straight-ahead driving;
a threshold selecting means for selecting a threshold for judging decrease in air-pressure on the basis of the determination of the comparing and determining means; and
a judged value calculating and processing means for calculating a judged value of decompression of air-pressure on the basis of the threshold. - View Dependent Claims (3)
- a rotational information detecting means for detecting rotational information of respective tires;
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4. A selecting program for a threshold for judging decompression of a tire which is so arranged that, for selecting a threshold for judging decrease in tire air-pressure, a computer is made to function as a rotational information detecting means for detecting rotational information of respective tires, a steering angle detecting means for detecting a steering angle, a memory means for storing the rotational information of the respective tires and the steering angle, a straight-ahead drive judging means for judging, based on the steering angle, whether the vehicle is performing straight-ahead driving, a turning radius calculating and processing means for calculating a turning radius on the basis of the rotational information of the tires, a comparing and determining means for determining, on the basis of the turning radius as calculated by the turning radius calculating and processing means, whether the vehicle is performing straight-ahead driving or not in case it has been determined on the basis of the steering angle that the vehicle is performing straight-ahead driving, a threshold selecting means for selecting a threshold for judging decrease in air-pressure on the basis of the determination of the comparing and determining means, and a judged value calculating and processing means for calculating a judged value of decompression of air-pressure on the basis of the threshold.
Specification