Tire condition monitoring device

a technology for condition monitoring and tires, which is applied in the direction of tire measurement, vehicle components, transportation and packaging, etc., can solve the problems of increasing power of transmitters, unable to obtain sufficient reception sensitivity in receivers on the vehicle side, and the inability of transmitters to take a long time of one transmission, etc., to achieve simple circuit configuration and reliable reception of signals.

Active Publication Date: 2016-10-27
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables reliable signal reception with a simple circuit configuration, reducing power consumption and compliance with regulatory radio wave intensity limits, while allowing immediate notification during vehicle operation and intermittent reception during stops, and suppressing unnecessary signal transmission for normal tire pressure.

Problems solved by technology

However, if an intensity of radio waves or the like is regulated under regulations, the transmitter cannot take a long time of one transmission.
Further, if the transmission time is long, the power of the transmitter increases.
As a result, a sufficient reception sensitivity may not be obtained in a receiver on the vehicle side.
In such a case, a method of increasing the transmission time as described in Japanese Unexamined Patent Application Publication No. 2005-153641 cannot be adopted.
However, for example, in a case in which the receiver is also used as another system (for example, a keyless entry system), the method in Japanese Unexamined Patent Application Publication No. 2005-153641 cannot be adopted since the interval of the reception operation of the receiver cannot be freely changed.
However, this method has a problem that a circuit configuration is complicated and costs increase.

Method used

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  • Tire condition monitoring device
  • Tire condition monitoring device
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Examples

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first embodiment

[0034]FIG. 1 is a diagram illustrating an example of a configuration of a tire condition monitoring device according to an embodiment of the present invention. The tire condition monitoring device illustrated in FIG. 1 is a device that monitors a condition of air pressure or the like in tires 5A to 5D of a vehicle 1, and includes tire-side devices 2A to 2D provided in the tires 5A to 5D, and a vehicle-side device 3 provided in a body of the vehicle 1. In the following description, any one of the tires 5A to 5D is referred to as “tire 5” as a representative, and any one of the tire-side devices 2A to 2D is referred to as “tire-side device 2” as a representative.

[0035]The tire condition monitoring device illustrated in FIG. 1 generally operates as follows. First, each tire-side device 2 detects a condition of the air pressure or the like of the tire 5 using a sensor, and intermittently transmits a notification signal for notifying of the detected state to the vehicle-side device 3. Th...

second embodiment

[0075]Next, a second embodiment of the present invention will be described.

[0076]In the tire condition monitoring device according to the first embodiment described above, the transmission period of the preamble is shifted in the direction in which the transmission period is delayed by the first shift time ΔT1 during periodic repetition of the reception process of the vehicle-side device 3, whereas in the tire condition monitoring device according to the second embodiment, the transmission period of the preamble is shifted in a direction in which the transmission period becomes earlier.

[0077]The tire condition monitoring device according to the second embodiment is different from the tire condition monitoring device illustrated in FIG. 1 in a method of controlling the transmission interval of the notification signal in the tire-side control unit 24 of the tire-side device 2, and other configurations are the same as those in the tire condition monitoring device illustrated in FIG. 1....

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Abstract

Each time a time corresponding to one period of an intermittent reception process in a vehicle-side device elapses, a transmission interval of a notification signal is controlled so that a transmission time of a preamble of the notification signal is shifted in a direction in which the transmission time is relatively delayed from an execution time of the reception process. Further, when the transmission time of the preamble passes through a range of the execution time of the reception process during this relative shift, the transmission interval of the notification signal is controlled so that the entire transmission time of the preamble is included in the range of the execution time of the reception process.

Description

CLAIM OF PRIORITY[0001]This application claims benefit of Japanese Patent Application No. 2015-088839 filed on Apr. 23, 2015, which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a tire condition monitoring device that transmits information for monitoring a condition of a tire from a transmitter installed in the tire to a receiver installed in a vehicle body.[0004]2. Description of the Related Art[0005]A tire pressure monitoring system (TPMS) that detects a pressure of a tire using a sensor, transmits the pressure to a device on the vehicle side, and monitors whether the air pressure is abnormal is known.[0006]In general, in a device on the tire side, a transmitter is controlled so that a transmission interval of a radio signal becomes long at the time of stop of a vehicle in order to reduce consumption of a battery. Further, in the device on the vehicle side, a receiver is controlled to operate in...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B60C23/04
CPCB60C23/0435B60C23/0455B60C23/0462
InventorUSHIDA, SATOSHITAKAHATA, SHINYA
OwnerALPS ALPINE CO LTD