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 rotational information obtained from tires attached to a vehicle, comprising the steps of:
- detecting rotational information of the respective tires;
storing the rotational information of the respective tires;
obtaining a slip rate between the tires and a road surface during running;
comparing the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and
judging simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and 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 rotational information obtained from tires attached to a vehicle. The method includes the steps of: detecting rotational information of the respective tires; storing the rotational information of the respective tires; obtaining a slip rate between the tires and a road surface during running; comparing the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and judging simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and a specified threshold. It is possible to judge simultaneous decompression of two wheel tires of both front wheels or wheel two tires of both rear wheels.
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Citations
6 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 rotational information obtained from tires attached to a vehicle, comprising the steps of:
- detecting rotational information of the respective tires;
storing the rotational information of the respective tires;
obtaining a slip rate between the tires and a road surface during running;
comparing the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and
judging simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and a specified threshold - View Dependent Claims (2)
- detecting rotational information of the respective tires;
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3. An apparatus for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of rotational information obtained from tires attached to a vehicle, comprising:
- rotational information detecting means which detect rotational information of the respective tires;
a rotational information storing which that stores the rotational information of the respective tires;
a slip rate calculating means which obtains a slip rate between the tires and a road surface during running;
a slip rate comparing means which compares the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and
a decompression judging means which judges simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and a specified threshold. - View Dependent Claims (4)
- rotational information detecting means which detect rotational information of the respective tires;
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5. A program for judging decompression of a tire, in which for judging decrease in tire air-pressure of a tire, a computer is made to function as a rotational information storing means which stores the rotational information of the respective tires;
- a slip rate calculating means which obtains a slip rate between the tires and a road surface during running;
a slip rate comparing means which compares the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and
a decompression judging means which judges simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and a specified threshold. - View Dependent Claims (6)
- a slip rate calculating means which obtains a slip rate between the tires and a road surface during running;
Specification