Tire pressure detecting system

• US 20040233049A1
• Filed: 12/16/2002
• Published: 11/25/2004
• Est. Priority Date: 12/17/2001
• Status: Active Grant

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Harada, Tomoyuki, Yamagiwa, Toshio
• Granted Patent: US 7,075,417 B2
• Time in Patent Office: Days
• US Class Current: 340/442
• CPC Class Codes: B60C 23/006 having two wheels only
• CPC Class Codes: B60C 23/0401 characterised by the type of alarm
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

Abstract

A fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation, and a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value are provided. For example, air leakage may be recognized rapidly, and abnormalities of air pressure may be recognized even when a faint air leakage occurs wherein fluctuations of the tire pressure per unit time do not exceed the predetermined threshold fluctuation.

Claims

1. A tire pressure detecting system wherein a tire pressure is detected by an air pressure sensor, and the detected tire pressure may be recognized comprising:

a fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation; and

a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value.

2. The tire pressure detecting system according to claim 1, and further including a air pressure determining unit disposed within a tire for determining if a warning is necessary.

3. The tire pressure detecting system according to claim 1, and further including a transmitter disposed within a tire for transmitting pressure information outside the tire and a receiver disposed outside the tire for issuing a warning based on pressure information.

4. The tire pressure detecting system according to claim 3, wherein the transmitter includes an air pressure sensor for detecting the air pressure and said fluctuation warning unit calculates fluctuations of the tire pressure per unit time of the air pressure sensor wherein said detected value warning unit issues a warning when the detected value of the tire pressure has fallen to a value below the predetermined threshold detected value.

5. The tire pressure detecting system according to claim 1, and further including a detected value warning unit for detecting the tire pressure and transmitting a warning based on air leakage that cannot be detected during a slow variation of the tire pressure per unit time.

6. A tire pressure detecting system of a type in which the tire pressure is detected by an air pressure sensor disposed on the wheel side, detected information on the tire pressure is issued from a transmitter disposed on the wheel side to a receiver disposed on the vehicle body side, and a warning is issued when the received tire pressure is outside a predetermined value comprising:

a temperature sensor for detecting air temperatures in the tire;

a pressure converting unit for converting the tire pressure detected by the air pressure sensor into a pressure at a predetermined temperature based on the air temperature detected by the temperature sensor; and

a transmission interval varying unit for shortening the interval of issuing a warning to the receiver when the converted pressure supplied from the pressure converting unit has fallen to a value below a predetermined threshold pressure.

7. The tire pressure detecting system according to claim 6, wherein said transmitter is disposed within a tire for transmitting pressure information outside the tire and a receiver is disposed outside the tire for issuing a warning based on pressure information.

8. The tire pressure detecting system according to claim 7, wherein the pressure converting unit provides a temperature correction to the air pressure based on the temperature of the air.

9. The tire pressure detecting system according to claim 6, and further including a detected value warning unit for detecting the tire pressure and transmitting a warning based on air leakage that cannot be detected during a slow variation of the tire pressure per unit time.

10. A tire pressure detecting system wherein a tire pressure is detected by an air pressure sensor and a warning is issued when the tire pressure lies outside a predetermined value comprising:

an ambient air pressure sensor for detecting ambient air pressure; and

a pressure converting unit for converting the tire pressure detected by the air pressure sensor into a pressure under the reference atmospheric pressure based on the ambient air pressure detected by the ambient air pressure sensor.

11. The tire pressure detecting system according to claim 10, wherein said air pressure sensor is disposed within a tire for determining if a warning is necessary.

12. The tire pressure detecting system according to claim 10, and further including a transmitter disposed within a tire for transmitting pressure information outside the tire and a receiver disposed outside the tire for issuing a warning based on pressure information.

13. The tire pressure detecting system according to claim 12, wherein the transmitter includes the air pressure sensor for detecting the air pressure and a fluctuation warning unit calculates fluctuations of the tire pressure per unit time of the air pressure sensor wherein said detected value warning unit issues a warning when the detected value of the tire pressure has fallen to a value below the predetermined threshold detected value.

14. The tire pressure detecting system according to claim 10, and further including a detected value warning unit for detecting the tire pressure and transmitting a warning based on air leakage that cannot be detected during a slow variation of the tire pressure per unit time.