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Tire inflation pressure detection device

  • US 9,776,461 B2
  • Filed: 06/16/2014
  • Issued: 10/03/2017
  • Est. Priority Date: 07/31/2013
  • Status: Active Grant
First Claim
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1. A tire inflation pressure detection device, comprising:

  • a plurality of transmitters correspondingly provided to a plurality of wheels which are respectively equipped with a tire, and each of the plurality of transmitters having;

    a sensor that outputs a detection signal relating to a tire inflation pressure of each corresponding wheel,a first controller that forms data relating to the tire inflation pressure by applying signal processing to the detection signal of the sensor and creates a frame in which the data is stored, anda radio transmitter that transmits the frame in a predetermined regular transmission cycle; and

    a receiver provided to a vehicle body side, and having;

    a radio receptor that receives the frame,a power-supply controller that controls a power supply to enable a reception of the frame at the radio receptor, anda second controller that detects an occurrence of a decrease of the tire inflation pressure based on the data relating to the tire inflation pressure stored in the frame which is received, wherein;

    the receiver operates on a supply of power from a battery and detects the tire inflation pressure while an ignition switch is in an on state by generating the power supply to enable the reception of the frame at the radio receptor using the power-supply controller to change a power-supply state of the receiver to a state in which the receiver is enabled to receive the frame, and detects the tire inflation pressure while the ignition switch is in an off state by generating the power supply to enable the reception of the frame at the radio receptor using the power-supply controller in every predetermined intermittent cycle to change the power-supply state of the receiver to the state in which the receiver is enabled to receive the frame;

    each of the plurality of transmitters determines based on the detection signal of the sensor whether a decrease of the tire inflation pressure occurs, and transmits, when a decrease of the tire inflation pressure occurs, the frame at a frame transmission time interval less than the regular transmission cycle during a high-frequency transmission zone set to be greater than or equal to the predetermined intermittent cycle at a frequency higher than a frequency before a decrease of the tire inflation pressure occurs; and

    the predetermined regular transmission cycle is set to be shorter than a reception enable cycle during which the receiver changes the power-supply state of the receiver to the state in which the receiver is enabled to receive the frame in the every intermittent cycle.

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