Tire pressure monitoring system
First Claim
1. A tire pressure monitoring system for a vehicle having a plurality of tires, the tire pressure monitoring system comprising:
- a plurality of remote units each unit being for mounting within each of the plurality of tires for receiving a first radio frequency (RF) signal, for detecting the pressure in the tire, and for transmitting a second RF signal, different from the first RF signal, when the detected pressure is greater than a predetermined pressure;
a corresponding plurality of remote energy transmitting circuits for mounting on the vehicle, each remote energy transmitting circuit being associated with one of the plurality of remote units and having an input for receiving an activate signal, and an antenna for transmitting the first RF signal in response to the receipt of the activate signal;
a corresponding plurality of remote receivers for mounting on the vehicle, each remote receiver being associated with one of plurality of remote energy transmitting units having an antenna for receiving the second RF signal, and an output for providing an output signal when the second RF signal is received; and
a controller for mounting on the vehicle, for coupling to the input of each of the remote energy transmitting circuits and for coupling to the output of each of the remote receivers, the controller being arranged for sequentially transmitting the activate signal to each of the remote energy transmitting circuits, and determining whether the output signal is received from each of the remote receivers before a predetermined time expires, whereinwhen the output signal is not received from one of the remote receivers after the predetermined time expires, the controller produces a signal indicating that there is a fault with the pressure detection of at least one of the plurality of tires.
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Accused Products
Abstract
Remote energy transmitting circuits 30, 35, 36, 37 sequentially transmit a first RF signal when activated by the controller 60. A remote unit 14 in the tire receives the first RF signal, and when the pressure in the tire is greater than a predetermined pressure, the remote unit 14 transmits a second RF signal. Via the remote receiver 20, the controller 60 determines whether the second RF signal is received within a predetermined time after transmitting the first RF signal. When the second RF signal is not received within the predetermined time, the controller 60 assumes a pressure detection failure and causes a display to indicate this condition.
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Citations
7 Claims
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1. A tire pressure monitoring system for a vehicle having a plurality of tires, the tire pressure monitoring system comprising:
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a plurality of remote units each unit being for mounting within each of the plurality of tires for receiving a first radio frequency (RF) signal, for detecting the pressure in the tire, and for transmitting a second RF signal, different from the first RF signal, when the detected pressure is greater than a predetermined pressure; a corresponding plurality of remote energy transmitting circuits for mounting on the vehicle, each remote energy transmitting circuit being associated with one of the plurality of remote units and having an input for receiving an activate signal, and an antenna for transmitting the first RF signal in response to the receipt of the activate signal; a corresponding plurality of remote receivers for mounting on the vehicle, each remote receiver being associated with one of plurality of remote energy transmitting units having an antenna for receiving the second RF signal, and an output for providing an output signal when the second RF signal is received; and a controller for mounting on the vehicle, for coupling to the input of each of the remote energy transmitting circuits and for coupling to the output of each of the remote receivers, the controller being arranged for sequentially transmitting the activate signal to each of the remote energy transmitting circuits, and determining whether the output signal is received from each of the remote receivers before a predetermined time expires, wherein when the output signal is not received from one of the remote receivers after the predetermined time expires, the controller produces a signal indicating that there is a fault with the pressure detection of at least one of the plurality of tires. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification