Initial correcting apparatus for automatically performing an initial correction processing in a tire air pressure reduction detecting apparatus

• US 5,983,715 A
• Filed: 03/26/1998
• Issued: 11/16/1999
• Est. Priority Date: 04/14/1997
• Status: Expired due to Term

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Rubber Industries Limited
• Inventors: Nakajima, Yoshio
• Primary Examiner(s): Felber, Joseph L.
• Application Number:
  US09/048,225
• Time in Patent Office: 600 Days
• Field of Search: 73/146.2, 340/444
• US Class Current: 73/146.2
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00

Abstract

According to the present invention, an initial correction is executed on the dynamic load radii of the tires automatically, for example, at the time when the power supply of the computer for executing a tire air pressure reduction detection processing is turned on for the first time after the tire air pressure reduction detecting apparatus has been produced. It is therefore not required to press the initialization switch for making an initial correction. This results in a reduction in the number of inspection steps.

Claims

1. A tire air pressure reduction detecting apparatus that detects the angular velocities of the tires of a motor vehicle having four wheels, and that detects a reduction in tire air pressure based on the angular velocities thus detected, and being adapted to execute an initial correction processing based on the dynamic load radii of the tires, comprising:

an initial correcting apparatus which performs initial correction processing that automatically starts at a time when a power supply of a computer for executing a tire air pressure reduction detection processing is turned on for the first time after the tire air pressure reduction detecting apparatus has been produced.

2. The tire air pressure reduction detecting apparatus recited in claim 1, wherein the initial correction processing automatically starts in the absence of an actuation of an initialization switch.

3. A tire air pressure reduction detecting apparatus that detects the angular velocities of the tires of a motor vehicle having four wheels, and that detects a reduction in tire air pressure based on the angular velocities thus detected, and being adapted to execute an initial correction processing based on the dynamic load radii of the tires, comprising:

an initial correcting apparatus which performs initial correction processing that automatically starts at a time when the motor vehicle has traveled a predetermined distance after a point in time in which a power supply of a computer for executing a tire air pressure reduction detection processing was turned on for the first time after the tire air pressure reduction detecting apparatus has been produced.

4. The tire air pressure reduction detecting apparatus recited in claim 3, wherein the predetermined distance is greater than zero.

5. The tire air pressure reduction detecting apparatus recited in claim 4, wherein the initial correction processing automatically starts in the absence of an actuation of an initialization switch.

6. A tire air pressure reduction detecting apparatus that detects the angular velocities of the tires of a motor vehicle having four wheels, and that detects a reduction in tire air pressure based on the angular velocities thus detected, and being adapted to execute an initial correction processing based on the dynamic load radii of the tires, comprising:

an initial correcting apparatus which performs initial correction processing that automatically starts at a time when a predetermined period of time has passed after a point in time in which a power supply of a computer for executing a tire air pressure reduction detection processing was turned on for the first time after the tire air pressure reduction detecting apparatus had been produced.

7. The tire air pressure reduction detecting apparatus recited in claim 6, wherein the predetermined period of time is greater than zero.

8. The tire air pressure reduction detecting apparatus recited in claim 7, wherein the initial correction processing automatically starts in the absence of an actuation of an initialization switch.

9. A tire air pressure reduction detecting apparatus that detects the angular velocities of the tires of a motor vehicle having four wheels, and that detects a reduction in tire air pressure based on the angular velocities thus detected, and being adapted to execute an initial correction processing based on the dynamic load radii of the tires, comprising:

an initial correcting apparatus which performs initial correction processing that automatically starts at a time when a power supply of a computer for executing a tire air pressure reduction detection processing has been turned on a predetermined number of times from a point in time in which the power supply was turned on for the first time after the tire air pressure reduction detecting apparatus had been produced.

10. The tire air pressure reduction detecting apparatus recited in claim 9, wherein the predetermined number of time is greater than zero.

11. The tire air pressure reduction detecting apparatus recited in claim 10, wherein the initial correction processing automatically starts in the absence of an actuation of an initialization switch.