Apparatus and method for detecting decrease in tire air-pressure

Details Apparatus and method for detecting decrease in tire air-pressure Apparatus and method for detecting decrease in tire air-pressure

1998-08-13

2000-10-24

Wu, Daniel J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340444, 340445, 73146, B60C 2300

Patent

active

061374008

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.

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