Apparatus and method for detecting decrease in tire air-pressure
First Claim
1. An apparatus for detecting a decrease in tire air-pressure in which decrease in internal pressure of tires is detected based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
- a rotational information detecting means for detecting rotational information of each tire;
a memory means for storing reference values of rotational information of each tire;
a calculating means for calculating a reciprocal of the turning radius of the vehicle for each tire based on the rotational information detected by the detecting means and the reference values of rotational information of each tire; and
a determining means for determining a decrease in internal pressure of each tire at each turning radius of the vehicle from a relationship between each reciprocal of the turning radius of the vehicle for each tire, the detected rotational information and the reference values of rotational information of each tire.
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Abstract
An apparatus for alarming decrease in tire air-pressure in which decrease in internal pressure of tires is alarmed based on rotational information obtained from tires attached to a four-wheeled vehicle. The apparatus comprises a rotational information detecting means for detecting rotational information of each tire, a memory means for storing the rotational information of each tire, a calculating means for calculating reciprocals of turning radiuses based on rotational information of tires attached to a driving shaft and judged values from the rotational information of each tire, and a determining means for determining decrease in internal pressure from a relationship between the reciprocals of the turning radiuses and judged values. Determination of decompression can be reliably performed in the proximity of a region at which the lateral axis is 0, since the judged values (DEL values) obtained while the differentiation is restricted are focused at points at which the lateral axis is 0, that is, on the vertical axis.
43 Citations
12 Claims
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1. An apparatus for detecting a decrease in tire air-pressure in which decrease in internal pressure of tires is detected based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
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a rotational information detecting means for detecting rotational information of each tire; a memory means for storing reference values of rotational information of each tire; a calculating means for calculating a reciprocal of the turning radius of the vehicle for each tire based on the rotational information detected by the detecting means and the reference values of rotational information of each tire; and a determining means for determining a decrease in internal pressure of each tire at each turning radius of the vehicle from a relationship between each reciprocal of the turning radius of the vehicle for each tire, the detected rotational information and the reference values of rotational information of each tire. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a decrease in tire air-pressure, comprising the steps of:
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storing reference values of rotation information for tires in a four-wheeled vehicle; detecting rotational information for tires on a four-wheeled vehicle; calculating a reciprocal of the turning radius of the vehicle for the tires from the detected rotational information and the reference values; and determining a decrease in the air-pressure of the tires at each turning radius of the vehicle from a relationship between the reciprocal of the turning radius of the vehicle calculated, the detected values and the reference values. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification