# US 11,298,990 B2 · Tire pressure monitoring system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,990 B2 - Document ID: US11298990B2 - Status: Granted - Kind: B2 - Application number: 16/326,286 - Filed: 2017-09-04 - Published: 2019-06-20 - Granted: 2022-04-12 - Earliest claimed: 2016-09-06 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Noriaki Okada - Web page: https://patentgrep.com/patent/US11298990B2 ## CPC - B60C 23/0438: {comprising signal transmission means, e.g. for a bidirectional communication with a corresponding wheel mounted receiver} - B60C 23/04: mounted on the wheel or tyre - B60C 23/0442: {the transmitted signal comprises further information, e.g. instruction codes, sensor characteristics or identification data} - B60C 23/0462: {Structure of transmission protocol} - G01L 17/00: Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies - G07C 5/0808: {Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005)} - B60C 23/20: Devices for measuring or signalling tyre temperature {only} - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE ## Abstract A sensor transceiver transitions into a first state that is capable of receiving RF waves intermittently. Upon starting to receive a burst signal on RF waves from a vehicle-body system under the first state, the sensor transceiver transitions into a second state that is capable of receiving RF waves continuously. Upon receiving a request signal on RF waves from the vehicle-body system under the second state, the sensor transceiver transmits data on tire pressure to the vehicle-body system. ## Claims ### Claim 1 A tire pressure monitoring system applied to a vehicle having a vehicle body which a plurality of wheels are attached to, the plurality of wheels being equipped with and respectively corresponding to a plurality of tires, the tire pressure monitoring system comprising: a plurality of sensor transceivers provided to and respectively corresponding to the plurality of wheels; and a vehicle-body system provided in the vehicle body, each of the sensor transceivers comprising: a sensing unit configured to detect a tire pressure of a tire of a corresponding wheel among the plurality of wheels; a first control unit configured to prepare a frame that stores data regarding the tire pressure; a first transmission unit configured to transmit the frame prepared by the first control unit on RF waves; and a first reception unit configured to receive RF waves, the vehicle-body system comprising: a second reception unit configured to receive a frame transmitted from each of the sensor transceivers; a second control unit configured to detect a respective tire pressure of each of the tires of the plurality of wheels based on the received frame; and a second transmission unit configured to transmit RF waves to be received by the first reception unit, wherein in the vehicle-body system, in response to detecting that there is a possibility that the vehicle starts to run, the second control unit outputs, on RF waves, a burst signal and then a request signal to each of the sensor transceivers, the burst signal causing the first reception unit of each of the sensor transceivers to transition into a state that is capable of continuously receiving RF waves, the request signal requesting each of the sensor transceivers to transmit the frame, wherein, in each of the sensor transceivers, the first control unit sets the first reception unit to a standby state that is capable of intermittently receiving RF waves, in response to the first reception unit receiving the burst signal under the standby state, the first control unit causes the first reception unit to transition into the state capable of continuously receiving RF waves to receive the request signal, and in response to the first reception unit receiving the request signal, the first control unit transmits the frame as a response to the request signal. ### Claim 2 (depends on 1) The tire pressure monitoring system according to claim 1, wherein a cycle at which the first reception unit transitions into the standby state capable of intermittently receiving RF waves is shorter than a transmission period of time during which the burst signal is transmitted. ### Claim 3 (depends on 1) The tire pressure monitoring system according to claim 1, wherein in response to receiving the request signal, the first control unit releases the first reception unit from the standby state and then transmits the frame. ### Claim 4 (depends on 1) The tire pressure monitoring system according to claim 1, wherein: the sensor transceiver provided to a corresponding wheel among the plurality of wheels has a unique identification information-item; and the second control unit sequentially assigns the plurality of sensor transceivers with respective unique identification information-items and transmits a plurality of request signals to the sensor transceivers, respectively, with mutually different transmission time frames. ### Claim 5 (depends on 1) The tire pressure monitoring system according to claim 1, wherein: each of the sensor transceivers includes an acceleration sensor and detects an acceleration of the vehicle based on a detection signal by the acceleration sensor; and in response to the acceleration not being detected after the frame is transmitted as the response to the request signal, the first control unit causes, after a predetermined period of time elapses, the first reception unit to again transition into the standby state. ### Claim 6 (depends on 1) The tire pressure monitoring system according to claim 1, wherein the first transmission unit and the first reception unit are integrated into a common part. ### Claim 7 (depends on 1) The tire pressure monitoring system according to claim 1, wherein the second transmission unit and the second reception unit are integrated into a common part. ### Claim 8 (depends on 1) The tire pressure monitoring system according to claim 1, wherein that there is a possibility that the vehicle starts to run is determined in response to that at least one of conditions, which include a first condition, a second condition, and a third condition, is satisfied, the first condition being a condition that an ignition switch provided in the vehicle switches from OFF state to ON state, the second condition being a condition that a door of the vehicle switches from a locked state to an unlocked state by a mechanical key or a remote key, the third condition being a condition that an electronic key is determined to be within a predetermined authentication range from a door of the vehicle.