Tire inflation pressure detecting apparatus capable of triggering only selected transceiver to perform task

• US 8,144,023 B2
• Filed: 08/26/2008
• Issued: 03/27/2012
• Est. Priority Date: 08/28/2007
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Watabe, Nobuya
• Primary Examiner(s): Tweel, Jr., John A
• Application Number:
  US12/198,525
• Publication Number:
  US 20090058626A1
• Time in Patent Office: 1,309 Days
• Field of Search: 340/626, 340/442, 340/443, 340/445, 340/505, 340/10.1, 340/10.4, 340/572.1, 731/465
• US Class Current: 340/626
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0442 the transmitted signal comprises further information, e.g. instruction codes, sensor characteristics or identification data
• CPC Class Codes: B60C 23/045 Means for detecting electromagnetic field changes being not part of the signal transmission per se, e.g. strength, direction, propagation or masking
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol

Abstract

A transceiver includes a receiver, a signal strength determiner, and a controller. The receiver receives a trigger signal transmitted by a triggering device; the trigger signal indicates both a signal strength range and a command. The signal strength determiner determines the strength of the trigger signal received by the receiver. The controller is configured to: 1) determine whether the strength of the trigger signal determined by the signal strength determiner is within the signal strength range indicated by the trigger signal; 2) and perform a task in accordance with the command indicated by the trigger signal only when the strength of the trigger signal is within the signal strength range.

Claims

1. A transceiver comprising:

a receiver that receives a trigger signal transmitted by a triggering device, the trigger signal including data identifying both a signal strength range and a command;

a signal strength determiner that determines strength of the trigger signal received by the receiver; and

a controller configured to;

determine whether the strength of the trigger signal determined by the signal strength determiner is within the signal strength range by data included in the trigger signal, and

perform a task in accordance with the command indicated by the trigger signal only when the strength of the trigger signal is within the signal strength range.

2. The transceiver as set forth in claim 1, further comprising a transmitter, wherein as the task, the controller controls the transmitter to transmit a response signal that contains ID information indicative of identity of the transceiver.

3. The transceiver as set forth in claim 1, wherein the triggering device transmits the trigger signal a plurality of times,

each time the receiver receives the trigger signal, the signal strength determiner determines the strength of the trigger signal received by the receiver and the controller makes the determination as to whether the strength of the trigger signal determined by the signal strength determiner is within the signal strength range included in the trigger signal, and

the controller performs the task only when all the results of the determinations are affirmative.

8. A transceiver as in claim 1, wherein:

said trigger signal includes data identifying one of plural possible commands, and

said controller is configured to perform one of plural possible tasks corresponding to the one of plural possible commands identified by data included in the trigger signal.

4. A wireless communication system for a vehicle, the system comprising:

first and second transceivers that are respectively located on first and second wheels of the vehicle, each of the transceivers being configured to;

receive a trigger signal that indicates both a signal strength range and a command,

determine strength of the trigger signal thereat,

determine whether the determined strength of the trigger signal is within the signal strength range indicated by the trigger signal, and

perform a task in accordance with the command indicated by the trigger signal only when the determined strength of the trigger signal is within the signal strength range;

a triggering device that transmits the trigger signal, the triggering device being located on a body of the vehicle at different distances from the first and second transceivers, so that the strengths of the trigger signal at the transceivers are different from each other;

a controller that is located on the body of the vehicle and configured to;

select one of the first and second transceivers,

set the signal strength range indicated by the trigger signal so that only the strength of the trigger signal at the selected one of the first and second transceivers is to fall within the signal strength range, and

control the triggering device to transmit the trigger signal, thereby triggering only the selected one of the first and second transceivers to perform the task in accordance with the command indicated by the trigger signal.

5. The wireless communication system as set forth in claim 4, further comprising a receiver and a memory both of which are located on the body of the vehicle,

wherein each of the first and second transceivers is configured to transmit, as the task, a response signal that contains ID information indicative of identity of the transceiver,

the receiver receives the response signal transmitted by the selected one of the first and second transceivers, and

the controller stores, in the memory, the ID information contained in the response signal received by the receiver as reference ID information associated with the wheel on which the selected one of the first and second transceivers is located.

6. The wireless communication system as set forth in claim 4, wherein the controller controls the triggering device to transmit the trigger signal a plurality of times,

each time the trigger signal is received, each of the first and second transceivers determines the strength of the trigger signal thereat, makes the determination as to whether the determined strength of the trigger signal is within the signal strength range indicated by the trigger signal, and

each of the first and second transceivers performs the task only when all the results of the determinations are affirmative.

7. The wireless communication system as set forth in claim 4, wherein the wireless communication system is incorporated in a tire inflation pressure detecting apparatus which includes:

first and second pressure sensors that are respectively located on the first and second wheels of the vehicle, each of the first and second pressure sensors being configured to sense inflation pressure of an associated one of tires fitted on the first and second wheels and output tire pressure information indicative of the sensed inflation pressure of the associated tire; and

a receiver located on the body of the vehicle,

wherein each of the first and second transceivers is configured to transmit, as the task, a response signal that contains the tire pressure information output from an associated one of the first and second pressure sensors,

the receiver receives the response signal transmitted by the selected one of the first and second transceivers, and

the controller determines, based on the tire pressure information contained in the response signal received by the receiver, the inflation pressure of the tire which is located on the same wheel as the selected one of the first and second transceivers.

9. A wireless communication system for a vehicle, said system comprising:

a plurality of transceivers, each being located on a respectively corresponding wheel of a vehicle and being configured to perform tasks including receiving wireless signals, determining signal strength as being within or outside a range set by data included in a received trigger signal in accordance with commands contained by further data within the trigger signal; and

a vehicle-mounted triggering device and controller that selects individual of said transceivers by setting the signal strength range specified by a transmitted triggering signal so that only the received strength of the trigger signal for that selected transceiver falls within the set signal strength range, thus controlling the triggering device to trigger only the selected one of the transceivers to perform a task also specified in the trigger signal.