Tire air pressure surveillance system

• US 20050065681A1
• Filed: 09/09/2004
• Published: 03/24/2005
• Est. Priority Date: 09/18/2003
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Watabe, Nobuya
• Granted Patent: US 7,512,467 B2
• Time in Patent Office: Days
• US Class Current: 701/29
• CPC Class Codes: B60C 23/007 having multiple wheels arranged side by side
• CPC Class Codes: B60C 23/008 having wheels on more than two axles
• CPC Class Codes: B60C 23/009 having wheels on a trailer
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right

Abstract

A tire air pressure surveillance system is provided with plural air pressure detecting devices disposed in plural tires respectively for detecting air pressure therein and for sending detected results by radio, a receiving device for receiving the detected results from the air pressure detecting devices by radio, and a monitor device for monitoring air pressure in the tires based on the detected results received by the receiving device. The air pressure detecting devices send sensor ID along with the detected results for distinguishing each air pressure detecting device. The sensor ID beforehand memorized in EEPRROM of the monitor device as determination sensor ID is broadcast-sent to the receiving device through a local area network at a predetermined interval. Only the detected results along with the sensor ID corresponding to the determination sensor ID are sent to the monitor device by the receiving device.

Claims

1. A tire air pressure surveillance system for a vehicle comprising:

a plurality of air pressure detecting devices disposed in a plurality of tires of the vehicle respectively, to detect an air pressure in each of the tires and to send by radio detected results of the air pressure detecting devices along with distinguishing information which is used to distinguish each of the air pressure detecting devices;

a receiving device for receiving the detected results sent from the air pressure detecting devices; and

a monitor device for monitoring the air pressure in each of the tires based on the detected results received by the receiving device, wherein;

the monitor device includes a memorizing means for memorizing the distinguishing information of all the air pressure detecting devices as determination information, and a determination-information sending means for sending the determination information memorized in the memorizing means to the receiving device every a predetermined timing; and

the receiving device includes

a received-information memorizing means for memorizing the determination information received from the monitor device as received determination information, and

a detected-result sending means for sending the detected results along with the distinguishing information corresponding to the received determination information to the monitor device, among the detected results received from the air pressure detecting devices.

2. The tire air pressure surveillance system according to claim 1, wherein the receiving device connects with the monitor device through a cable signal channel.

3. The tire air pressure surveillance system according to claim 1, wherein the receiving device connects with the monitor device through a radio signal channel.

4. The tire air pressure surveillance system according to claim 2, wherein:

the receiving device is constructed with a plurality of receiving parts; and

the determination-information sending means broadcast-sends the determination information of all the air pressure detecting devices to all the receiving parts.

5. The tire air pressure surveillance system according to claim 1, wherein:

the receiving device has a requiring-order sending means which sends a sending-requiring order for requiring the monitor device to send the determination information when the received determination information is determined to be changed; and

the monitor device has a resending means which sends the determination information to the receiving device when the monitor device receives the sending-requiring order from the receiving device.

6. The tire air pressure surveillance system according to claim 1, wherein

the receiving device has an another detected-result sending means which sends all the detected results received from the air pressure detecting devices to the monitor device when the received determination information is determined to be changed.

7. The tire air pressure surveillance system according to claim 1, wherein:

the detected results are received in the receiving device as detected data;

the monitor device further includes a control portion for periodically sending a data-requiring order to the receiving device to require a sending of the detected data; and

the receiving device further includes;

a control portion which gives a requiring information to the detected data received by the receiving device, the requiring information being constructed with a first set value for indicating a requirement of a sending of the determination information from the monitor device, and a second set value for indicating no requirement of a sending of the determination information from the monitor device; and

an error detecting means provided with an error flag which is set for indicating a change of the received determination information and is cleared for indicating no change of the received determination information,

wherein the detected-result sending means sends the detected data to the monitor device together with the requiring information with the first set value when the error flag is set and the data-requiring order is received, or the detected data to the monitor device together with the requiring information with the second set value when the error flag is cleared and the data-requiring order is received.

8. the tire air pressure surveillance system according to claim 7, wherein the first set value is 1 and the second set value is 0.