Wheel position detecting device and tire air pressure detecting device using the same
First Claim
1. A detecting apparatus for detecting an air-pressure of a tire fitted around each of a plurality of wheels provided on a body of a vehicle comprising a triggering device provided on the body, a plurality of transmitters provided on each of the plurality of wheels, and a receiver provided on the body:
- the triggering device sending a trigger signal to at least two of the plurality of transmitters so as to be received by the at least two of the plurality of transmitters;
each of the plurality of transmitters comprising;
a sensing unit sensing a datum representing the air-pressure of tire;
a first receiving unit receiving the trigger signal from the triggering device;
a first control unit getting the datum from the sensing unit, embedding the datum into a frame, and outputting the frame to when receiving the trigger signal; and
a transmitting unit receiving the frame output from the first control unit and transmitting the frame at a timing; and
the receiver comprising;
a second receiving unit receiving the frame sent by each of the plurality of transmitters;
a second control unit comprising;
a calculating unit calculating the air-pressure of tire fitted around each of the plurality of wheels based on the datum embedded in the frame;
a judging unit judging whether or not the second receiving unit receives the frame at the timing of sending frame by the transmitting unit; and
a retrying unit commanding the triggering device to resend the trigger signal at a different timing from the timing of transmitting frame by the transmitting unit of the sender when the judging unit judges that the second receiving unit fails to receive the frame.
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Accused Products
Abstract
A tire air pressure detecting device that determines whether an abnormality has occurred in a transmitter is provided. When a response is not received from the transmitter mounted on a wheel, wheel information detection is retried because an abnormality may have occurred in the transmitter. A triggering device is provided on the vehicle-body side and requests a response from the transmitter corresponding to the relevant wheel. The wheel information detection is retried by the triggering device being instructed to output a trigger signal (re-try trigger signal) at a timing (phase) differing from a steady transmission. As a result, the tire air pressure detecting device can accurately determine whether the unresponsive state of the transmitter is caused by an abnormality in the transmitter or by another cause.
12 Citations
10 Claims
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1. A detecting apparatus for detecting an air-pressure of a tire fitted around each of a plurality of wheels provided on a body of a vehicle comprising a triggering device provided on the body, a plurality of transmitters provided on each of the plurality of wheels, and a receiver provided on the body:
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the triggering device sending a trigger signal to at least two of the plurality of transmitters so as to be received by the at least two of the plurality of transmitters; each of the plurality of transmitters comprising; a sensing unit sensing a datum representing the air-pressure of tire; a first receiving unit receiving the trigger signal from the triggering device; a first control unit getting the datum from the sensing unit, embedding the datum into a frame, and outputting the frame to when receiving the trigger signal; and a transmitting unit receiving the frame output from the first control unit and transmitting the frame at a timing; and the receiver comprising; a second receiving unit receiving the frame sent by each of the plurality of transmitters; a second control unit comprising; a calculating unit calculating the air-pressure of tire fitted around each of the plurality of wheels based on the datum embedded in the frame; a judging unit judging whether or not the second receiving unit receives the frame at the timing of sending frame by the transmitting unit; and a retrying unit commanding the triggering device to resend the trigger signal at a different timing from the timing of transmitting frame by the transmitting unit of the sender when the judging unit judges that the second receiving unit fails to receive the frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification