Tire air-pressure abnormality alarming device and method thereof
First Claim
1. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
- means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air-pressure, if air-pressure abnormality of a tire is being alarmed.
1 Assignment
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Accused Products
Abstract
A tire air-pressure abnormality alarming device for informing decrease in air-pressure of tires attached to a four-wheeled vehicle, characterized in that the device prohibits start of initializing operations for updating stored values for physical amounts related to tires or wheels in the case where air-pressures of the tires are judged to be normal, if air-pressure abnormality of a tire is being alarmed. Initialization is accepted only after the internal pressure has become normal, whereby erroneous initialization with any tire being in a decompressed condition can be prevented. Thus, normal operations for detecting decompression of a tire can be maintained.
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Citations
10 Claims
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1. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air-pressure, if air-pressure abnormality of a tire is being alarmed.
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2. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air-pressure, if the vehicle is determined to be in a running condition.
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3. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air-pressure, if an inspection mode is being assumed.
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4. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air-pressure, if a system is in an abnormal condition or in a terminated condition.
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5. A tire air-pressure abnormality alarming method comprising:
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detecting rotational angular speeds of tires or wheels of a four-wheeled vehicle;
storing coefficients related to the tires or wheels obtained from the rotational angular speeds;
determining whether air-pressure has decreased or not from a relationship between a reference value and a determined value for decompression obtained from rotational angular speeds corrected by using the coefficients; and
prohibiting start of initializing operations for updating the stored reference values for tires having a normal air-pressure, if air-pressure abnormality of a tire is being alarmed.
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6. A tire air-pressure abnormality alarming method comprising:
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detecting rotational angular speeds of tires or wheels of a four-wheeled vehicle;
storing coefficients related to the tires or wheels obtained from the rotational angular speeds;
determining whether air-pressure has decreased or not from a relationship between a reference value and a determined value for decompression obtained from rotational angular speeds corrected by using the coefficients; and
prohibiting start of initializing operations for updating the stored reference values for tires having a normal air-pressure, if the vehicle is determined to be in a running condition.
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7. A tire air-pressure abnormality alarming method comprising:
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detecting rotational angular speeds of tires or wheels of a four-wheeled vehicle;
storing coefficients related to the tires or wheels obtained from the rotational angular speeds;
determining whether air-pressure has decreased or not from a relationship between a reference value and a determined value for decompression obtained from rotational angular speeds corrected by using the coefficients; and
prohibiting start of initializing operations for updating the stored reference values for tires having a normal air-pressure, if an inspection mode is being assumed.
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8. A tire air-pressure abnormality alarming method comprising:
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detecting rotational angular speeds of tires or wheels of a four-wheeled vehicle;
storing coefficients related to the tires or wheels obtained from the rotational angular speeds;
determining whether air-pressure has decreased or not from a relationship between a reference value and a determined value for decompression obtained from rotational angular speeds corrected by using the coefficients; and
prohibiting start of initializing operations for updating the stored reference values for tires having a normal air-pressure, if a system is in an abnormal condition or in a terminated condition.
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9. A tire air-pressure abnormality alarming device for informing a driver of a decrease in air-pressure of tires attached to a four-wheeled vehicle, comprising:
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means for prohibiting start of initializing operations for updating stored air-pressure reference values for tires having a normal air pressure if one of the following is occurring;
(a) if air-pressure abnormality of a tire is being alarmed;
(b) if the vehicle is determined to be in a running condition;
(c) if an inspection mode is being assumed; and
(d) if a system is in an abnormal condition or in a terminated condition.
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10. A tire air-pressure abnormality alarming method comprising:
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detecting rotational angular speeds of tires or wheels of a four-wheeled vehicle;
storing coefficients related to the tires or wheels obtained from the rotational angular speeds;
determining whether air-pressure has decreased or not from a relationship between a reference value and a determined value for decompression obtained from rotational angular speeds corrected by using the coefficients; and
prohibiting start of initializing operations for updating the stored reference values for tires having a normal air-pressure, if one of the following is occurring;
(a) if air-pressure abnormality of a tire is being alarmed;
(b) if the vehicle is determined to be in a running condition;
(c) if an inspection mode is being assumed; and
(d) if a system is in an abnormal condition or in a terminated condition.
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Specification