Mehtod for alarming a decrease in tire air-pressure and device thereof, and program thereof

• US 20080238645A1
• Filed: 02/13/2008
• Published: 10/02/2008
• Est. Priority Date: 03/30/2007
• Status: Abandoned Application

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Oshiro, Yuji
• Application Number:
  US12/068,939
• Publication Number:
  US 20080238645A1
• Time in Patent Office: Days
• US Class Current: 340/444
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00

Abstract

The subject is to provide a method for alarming a decrease in tire air-pressure that can improve the precision of the reduced pressure judgment and a device thereof and a program for judging the decrease in tire air-pressure.

Means for solution is a method for alarming a decrease in tire air-pressure that informs the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, a device thereof and a program thereof, wherein the influence of turning and the influence of acceleration to a lateral direction that are the correction factors of the judged value of the decrease in tire air-pressure are excluded.

Claims

1. A method for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, comprising a step of determining rotational speed obtained from respective tires,

a step of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning of a vehicle,

a step of memorizing the rotational speed, the first, second and third judged values, and

a step of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

2. A method for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, comprising a step of determining rotational speed obtained from respective tires,

a step of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a step of memorizing the rotational speed, the first, second and third judged values, and

a step of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

4. The method for alarming a decrease in tire air-pressure according to claim 2, whereby influence by load movement caused by the acceleration to a lateral direction is determined by preliminary running.

5. The method for alarming a decrease in tire air-pressure according to claim 2, whereby influence by load movement caused by the acceleration to a lateral direction is determined by preliminary running after loading tires.

3. A method for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, comprising a step of determining rotational speed obtained from respective tires,

a step of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning of a vehicle and influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a step of memorizing the rotational speed, the first, second and third judged values, and

a step of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

12. The method for alarming a decrease in tire air-pressure according to claim 3, whereby influence by load movement caused by the acceleration to a lateral direction is determined by preliminary running.

13. The method for alarming a decrease in tire air-pressure according to claim 3, whereby influence by load movement caused by the acceleration to a lateral direction is determined by preliminary running after loading tires.

6. A device for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, equipped with a means of detecting rotational speed obtained from respective tires,

a judged value calculation means of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning,

a memory means of memorizing the rotational speed, the first, second and third judged values, and

a judgment means of judging the decrease in tire air-pressure from judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

7. A device for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, equipped with a means of detecting rotational speed obtained from respective tires,

a judged value calculation means of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a memory means of memorizing the rotational speed, the first, second and third judged values, and

a judgment means of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

8. A device for alarming a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, equipped with a means of detecting rotational speed obtained from respective tires,

a judged value calculation means of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning and influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a means of memorizing the rotational speed, the first, second and third judged values, and p1 a judgment means of judging the decrease in tire air-pressure from judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

9. A program for judging a decrease in tire air-pressure that detects a decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, for letting a computer enforce a procedure of detecting rotational speed obtained from respective tires,

a judged value calculation procedure of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning,

a procedure of memorizing the rotational speed, the first, second and third judged values, and

a judgment procedure of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

10. A program for judging a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, for letting a computer enforce a procedure of detecting rotational speed obtained from respective tires,

a judged value calculation procedure of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a memory procedure of memorizing the rotational speed, the first, second and third judged values, and

a judgment procedure of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.

11. A program for judging a decrease in tire air-pressure that detects the decrease in tire air-pressure based on the rotational speed obtained from tires loaded on a four-wheeled vehicle, for letting a computer enforce a procedure of detecting rotational speed obtained from respective tires,

a judged value calculation procedure of calculating the first judged value comparing the rotational speed of a pair of tires on 2 pairs of orthogonal lines, the second judged value comparing the rotational speed of front wheels and rear wheels and the third judged value comparing the rotational speed of right wheels and left wheels after correcting influence caused by the turning and influence caused by acceleration to a lateral direction and load movement caused by the acceleration to a lateral direction,

a memory procedure of memorizing the rotational speed, the first, second and third judged values, and

a judgment procedure of judging the decrease in tire air-pressure based on judgment condition by every judged value of the first, second and third judged values that are set for each of tires.