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, said detecting apparatus comprising:
- a triggering device provided on the body;
a plurality of transmitters, one transmitter being provided on each of the plurality of wheels; and
a receiver provided on the body;
the triggering device sending a trigger signal to the plurality of transmitters so that the trigger signal reaches 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 a 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 a 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 a transmitting frame by the transmitting unit of the transmitter 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 determines whether an abnormality has occurred in a transmitter. 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.
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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, said detecting apparatus comprising:
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a triggering device provided on the body; a plurality of transmitters, one transmitter being provided on each of the plurality of wheels; and a receiver provided on the body; the triggering device sending a trigger signal to the plurality of transmitters so that the trigger signal reaches 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 a 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 a 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 a transmitting frame by the transmitting unit of the transmitter 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