Abstract: A tire pressure detection system that includes a plurality of transmission apparatuses that transmit a request signal for requesting air pressure information of a tire of a vehicle, a detection apparatus that detects air pressure in a tire in accordance with the request signal, and transmits a response signal that includes air pressure information, and an acquisition apparatus that receives the response signal, and acquires the air pressure information, and, in a case of an abnormality where a response signal in response to the request signal of one transmission apparatus is not received by the acquisition apparatus after the one transmission apparatus has transmitted the request signal to the detection apparatus, another transmission apparatus transmits a high-power request signal of a higher output level than the request signal of the one transmission apparatus.

Abstract: A communication system and a comparison method for securing a communication path for a legitimate user via a terminal apparatus (“TA”). A vehicle-mounted communication device (“VMCD”) transmits a device ID identifying the VMCD to a TA, acquires a terminal ID from the TA, and transmits the device ID and the terminal ID acquired from the TA to a central apparatus. The TA transmits a terminal ID identifying the TA to the VMCD, acquires a device ID from the VMCD, and transmits the terminal ID and the device ID acquired from the VMCD to the central apparatus. The central apparatus receives a device ID and a terminal ID transmitted from the VMCD and a device ID and a terminal ID transmitted from the TA, and compares the device ID and the terminal ID received from the VMCD with the device ID and the terminal ID received from the TA.

Abstract: A tire pressure detection system that includes a plurality of transmission apparatuses that transmit a request signal for requesting air pressure information of a tire of a vehicle, a detection apparatus that detects air pressure in a tire in accordance with the request signal, and transmits a response signal that includes air pressure information, and an acquisition apparatus that receives the response signal, and acquires the air pressure information, and, in a case of an abnormality where a response signal in response to the request signal of one transmission apparatus is not received by the acquisition apparatus after the one transmission apparatus has transmitted the request signal to the detection apparatus, another transmission apparatus transmits a high-power request signal of a higher output level than the request signal of the one transmission apparatus.

Abstract: A monitoring device comprises an acquisition unit configured to acquire information related to movement or stoppage of the vehicle; a request signal transmission unit configured to wirelessly transmit the request signal to the detection device if it is determined that the vehicle is stopped based on the information acquired by the acquisition unit; an air pressure signal reception unit configured to receive the air pressure signal that is transmitted from the detection device in response to the request signal; and an output unit configured to, in a case where the request signal transmission unit transmitted the request signal, outputs a warning signal for giving a warning inside the vehicle, if the air pressure signal in response to the request signal is not received by the air pressure signal reception unit.

Abstract: Provided is a vehicular communication system configured to prevent crosstalk between signals transmitted from an in-vehicle wireless device constituting one wireless communication system such as a TPMS and a mobile device constituting another wireless communication system. The vehicular communication system includes a mobile device wirelessly transmitting a signal related to operation of a vehicle, an in-vehicle wireless device wirelessly transmitting a signal related to the vehicle, and an in-vehicle communication apparatus provided in a different part from the in-vehicle wireless device and wirelessly communicates with the mobile device and the in-vehicle wireless device. The in-vehicle communication apparatus receives signals transmitted from the mobile device and the in-vehicle communication apparatus, and determines whether there is crosstalk.

Abstract: Provided is an onboard storage device and an onboard storage system that can correctly store identification information of communication devices provided in the tires of the own vehicle even if tire rotation, tire replacement, or the like is performed. A monitoring device detects the existence or absence of a situation in which another vehicle is not present in the periphery of the vehicle. If the monitoring device detects the existence of a situation in which another vehicle is not present, the monitoring device transmits, to each of multiple detection devices that are respectively provided in the tires of the vehicle, a request signal that requests the sensor ID of the detection device. The monitoring device receives the sensor IDs that are transmitted by the detection devices in accordance with the request signals, and stores the received sensor IDs in a sensor ID table.

Abstract: An tire air pressure monitoring system is provided configured to reduce the information amount of signals transmitted and received by a vehicle-mounted radio device and a vehicle-mounted communication device, and prevent a processing delay and a improve reliability of air pressure information. The tire air pressure monitoring system includes an air pressure acquisition unit that acquires the air pressure of a tire, a vehicle-mounted radio device wirelessly transmits a signal regarding the air pressure acquired by the air pressure acquisition unit, and a vehicle-mounted communication device in a separate location from the vehicle-mounted radio device and receives the signal transmitted by the vehicle-mounted radio device. The vehicle-mounted radio device includes a calculation unit calculating a temporal change amount of the air pressure acquired by the air pressure acquisition unit, and a transmission unit that transmits a signal indicating the air pressure change amount calculated by the calculation unit.

Abstract: Provided is a vehicular communication system configured to prevent crosstalk between signals transmitted from an in-vehicle wireless device constituting one wireless communication system such as a TPMS and a mobile device constituting another wireless communication system. The vehicular communication system includes a mobile device wirelessly transmitting a signal related to operation of a vehicle, an in-vehicle wireless device wirelessly transmitting a signal related to the vehicle, and an in-vehicle communication apparatus provided in a different part from the in-vehicle wireless device and wirelessly communicates with the mobile device and the in-vehicle wireless device. The in-vehicle communication apparatus receives signals transmitted from the mobile device and the in-vehicle communication apparatus, and determines whether there is crosstalk.

Abstract: A communication system and a comparison method for securing a communication path for a legitimate user via a terminal apparatus (“TA”). A vehicle-mounted communication device (“VMCD”) transmits a device ID identifying the VMCD to a TA, acquires a terminal ID from the TA, and transmits the device ID and the terminal ID acquired from the TA to a central apparatus. The TA transmits a terminal ID identifying the TA to the VMCD, acquires a device ID from the VMCD, and transmits the terminal ID and the device ID acquired from the VMCD to the central apparatus. The central apparatus receives a device ID and a terminal ID transmitted from the VMCD and a device ID and a terminal ID transmitted from the TA, and compares the device ID and the terminal ID received from the VMCD with the device ID and the terminal ID received from the TA.

Abstract: A program update system and method that are able to verify the legitimacy of an update of a program executed on a vehicle side. An exterior device stores update data including an update control program for a control device targeted for updating and a computer program that implements means for calculating a digest value relating to the update control program, means for determining whether operation of the control device after the update is normal, and means for transmitting a result of the determination as a response. The control device to receives the update data that is transmitted from the exterior device via a relay device and updates the control program using the update control program included in the update data, and determines whether operation after the update is normal and transmits a result of the determination to the relay device by executing the computer program.