Method and apparatus for detecting decrease in tire air-pressure and program for judging decompression of tire
First Claim
1. A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of wheel speed information obtained from wheels attached to a vehicle, comprising the steps of:
- detecting wheel speed information of the respective tires;
storing the wheel speed information of the respective tires;
obtaining a vehicle body velocity of the vehicle on the basis of the wheel speed information;
obtaining vehicle information of the vehicle during running including driving force, wheel torque or slip rate;
calculating a judged value of decompression on the basis of wheel speed information of the respective tires; and
detecting decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the vehicle information and comparing the multiple correlation coefficient with a specified threshold.
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Abstract
A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of wheel speed information obtained from wheels attached to a vehicle. The method includes the steps of: detecting wheel speed information of the respective tires; storing the wheel speed information of the respective tires; obtaining a vehicle body velocity of the vehicle; obtaining vehicle information of the vehicle during running such as driving force, wheel torque or slip rate; calculating a judged value of decompression; and detecting decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the vehicle information and comparing the multiple correlation coefficient with a specified threshold. It is possible to accurately detect decompression of a tire.
12 Citations
8 Claims
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1. A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of wheel speed information obtained from wheels attached to a vehicle, comprising the steps of:
- detecting wheel speed information of the respective tires;
storing the wheel speed information of the respective tires;
obtaining a vehicle body velocity of the vehicle on the basis of the wheel speed information;
obtaining vehicle information of the vehicle during running including driving force, wheel torque or slip rate;
calculating a judged value of decompression on the basis of wheel speed information of the respective tires; and
detecting decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the vehicle information and comparing the multiple correlation coefficient with a specified threshold. - View Dependent Claims (2, 3)
- detecting wheel speed information of the respective tires;
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4. An apparatus for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of wheel speed information obtained from wheels attached to a vehicle, comprising:
- wheel speed information detecting means which detect wheel speed information of the respective tires;
a memory means which stores the wheel speed information of the respective tires;
a velocity calculating means which obtains a vehicle body velocity of the vehicle on the basis of the wheel speed information;
a vehicle information calculating means that obtains vehicle information of the vehicle during running including driving force, wheel torque or slip rate;
a judged value calculating means that calculates a judged value of decompression on the basis of wheel speed information of the respective tires; and
a detecting means which detects decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the vehicle information and comparing the multiple correlation coefficient with a specified threshold. - View Dependent Claims (5, 6)
- wheel speed information detecting means which detect wheel speed information of the respective tires;
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7. A program for judging decompression of a tire, wherein for judging decrease in tire air-pressure, a computer is made to function as a memory means which stores the wheel speed information of the respective tires;
- a velocity calculating means which obtains a vehicle body velocity of the vehicle on the basis of the wheel speed information;
a vehicle information calculating means which obtains vehicle information of the vehicle during running including driving force, wheel torque or slip rate;
a judged value calculating means which calculates a judged value of decompression on the basis of wheel speed information of the respective tires; and
a detecting means which detects decrease in air-pressure of a tire upon calculating a multiple correlation coefficient for the judged value between the vehicle body velocity and the driving wheel and comparing the multiple correlation coefficient with a specified threshold. - View Dependent Claims (8)
- a velocity calculating means which obtains a vehicle body velocity of the vehicle on the basis of the wheel speed information;
Specification