Apparatus and method for alarming decrease in tire air-pressure
First Claim
1. An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle, comprising:
- rotational information detecting means for detecting a rotational information of each of the tires;
memory means for storing the rotational information of each of the tires;
calculation processing means for calculating a reciprocal number of a turning radius from the rotational information of the tires attached to a driving shaft among the rotational information of the respective tires and calculating a judged value from the rotational information of the respective tires;
first judging means for comparing the judged value with a reference value at every regions of the turning radius on the basis of a relation between the reciprocal number of the turning radius and the judged valve so as to judge decrease in internal pressure; and
second judging means for canceling a judgement of decrease of internal pressure when a difference between the judged value in the right turning region and the judged value in the left turning region is different from a difference between a reference judged value in the right turning region and a reference judged value in the left turning region which are obtained at a time of initializing run.
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Accused Products
Abstract
An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle. The apparatus comprises rotational information detecting means; memory means for storing the rotational information; calculation processing means for calculating a reciprocal number of a turning radius and calculating a judged value; first judging means for comparing the judged value with a reference value at every regions of the turning radius; and second judging means for canceling a judgement of decrease of internal pressure when a difference between the judged values in the right and left turning regions is different from a difference between reference judged values in the right and left turning regions which are obtained at a time of initializing run.
15 Citations
2 Claims
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1. An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle, comprising:
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rotational information detecting means for detecting a rotational information of each of the tires;
memory means for storing the rotational information of each of the tires;
calculation processing means for calculating a reciprocal number of a turning radius from the rotational information of the tires attached to a driving shaft among the rotational information of the respective tires and calculating a judged value from the rotational information of the respective tires;
first judging means for comparing the judged value with a reference value at every regions of the turning radius on the basis of a relation between the reciprocal number of the turning radius and the judged valve so as to judge decrease in internal pressure; and
second judging means for canceling a judgement of decrease of internal pressure when a difference between the judged value in the right turning region and the judged value in the left turning region is different from a difference between a reference judged value in the right turning region and a reference judged value in the left turning region which are obtained at a time of initializing run.
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2. A method for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle, comprising the steps of:
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comparing a judged value with a reference value at every regions of a turning radius so as to judge decrease in internal pressure on the basis of a relation between a reciprocal number of the turning radius calculated from the rotational information of a tire attached to a driving shaft in the four-wheeled vehicle and a judged value calculated from the rotational information of the tires attached to the four-wheeled vehicle; and
canceling a judgement of decrease in internal pressure when a difference between the judged value in the right turning region and the judged value in the left turning region is different from a difference between a reference judged value in the right turning region and a reference judged value in the left turning region which are obtained at a time of initializing run.
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Specification