Apparatus, method and program for alarming decrease in tire air-pressure

Abstract

To provide an apparatus, method and program for alarming decrease in tire air-pressure which enable to detect decrease in air-pressure of all of four-wheels tires at reduced costs. The apparatus for alarming decrease in tire air-pressure includes means of (1) detecting decrease in tire air-pressure by measuring change of parameter in relation to resonance condition in the tire, and (2) detecting decrease in tire air-pressure by making relative comparison of dynamic loaded radii of tires, wherein the means (1) is included in one to three-wheel tires on a four-wheel vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing one Embodiment according to the apparatus for alarming decrease in tire air-pressure of the present invention;

FIG. 2 is a diagram showing an electrical configuration of the apparatus for alarming decrease in tire air-pressure in FIG. 1;

FIG. 3 is a diagram showing methods for detecting decrease in air-pressure when a tire air-pressure of one wheel among four wheels is decreased;

FIG. 4 is a diagram showing methods for detecting decrease in air-pressure when tire air-pressures of two wheels among four wheels are decreased;

FIG. 5 is a diagram showing methods for detecting decrease in air-pressure when tire air-pressure of three wheels among four wheels are decreased; and

FIG. 6 is a diagram showing methods for detecting decrease in air-pressure when tire air-pressures of all of four wheels are decreased.

Claims

1. An apparatus for alarming decrease in tire air-pressure, comprising means of: (1) detecting decrease in tire air-pressure by measuring change of parameter in relation to resonance condition in the tire; and(2) detecting decrease in tire air-pressure by making relative comparison of dynamic loaded radii of tires;wherein the means (1) is included in one to three-wheel tires on a four-wheels vehicle.

2. A method for alarming decrease in tire air-pressure, comprising steps of: (1) detecting decrease in tire air-pressure by measuring change of parameter in relation to resonance condition in the tire; and(2) detecting decrease in tire air-pressure by making relative comparison of dynamic loaded radii of tires;wherein the step (1) is implemented by one to three-wheel tires on a four-wheel vehicle.

3. A program for alarming decrease in tire air-pressure, making a computer execute the procedure of: (1) detecting decrease in tire air-pressure by measuring change of parameter in relation to resonance condition in the tire; and(2) detecting decrease in tire air-pressure by making relative comparison of dynamic loaded radii of tires;wherein the procedure (1) is implemented by one to three-wheel tires on a four-wheel vehicle.