Tire parameter sensing system having a tire rotation dependent transmission scheme

摘要

A tire parameter sensing system ( 12 ) for a vehicle ( 10 ) comprises a vehicle-based unit ( 42 ) for receiving parameter signals. A tire-based unit ( 34 ) is associated with a tire ( 16 ) of the vehicle ( 10 ) and rotates with the tire ( 16 ). The tire-based unit ( 34 ) is located in a communication zone ( 134 ) for communicating with the vehicle-based unit ( 42 ) through only a portion of each rotation of the tire ( 16 ). The tire-based unit ( 34 ) is configured to sense a parameter of the tire ( 16 ) and to transmit a parameter signal ( 54 ) indicative thereof. The system ( 12 ) also comprises means ( 78 ) for monitoring the rotation of the tire and for providing rotation information indicative of the monitored tire rotation. The tire-based unit ( 34 ) is responsive to the rotation information for transmitting the parameter signal ( 54 ) while the tire-based unit ( 34 ) is located the communication zone ( 134 ).