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

• US 20070139179A1
• Filed: 11/22/2006
• Published: 06/21/2007
• Est. Priority Date: 12/16/2005
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Yanase, Minao
• Granted Patent: US 7,579,943 B2
• Time in Patent Office: Days
• US Class Current: 340/443
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00
• CPC Class Codes: B60C 23/062 Frequency spectrum analysis of wheel speed signals, e.g. using Fourier transformation

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.

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.