Abstract: An on-vehicle control device includes a transmission unit transmitting to a mobile device a response request signal requesting a response in response to operation of instructing a start of a driving source causing a vehicle to drive. An authentication unit authenticates the mobile device and performs start control of the driving source depending on success or failure of authentication by the authentication unit. A determination unit determines a presence or an absence of unauthorized authentication for the authentication unit. A detection unit detects an authorized occupant for the vehicle. A start prohibition unit prohibits the start of the driving source when the determination unit determines that unauthorized authentication is present for the authentication unit. A start permission unit permits the start of the driving source regardless of determination by the determination unit when the detection unit detects the occupant.

Abstract: According to the present disclosure, an authentication system includes: a first communication device including: a first transmitting part configured to communicate in a first frequency band; and a first transmitting-and-receiving part configured to communicate in a second frequency band; and a second communication device including: a first receiving part configured to communicate in the first frequency band; and a second transmitting-and-receiving part configured to communicate in the second frequency band, and, in this authentication system, the first communication device transmits a command in the first frequency band from the first transmitting part, and, upon receipt of the command by the first receiving part, the second communication device activates the second transmitting-and-receiving part, generates an authentication key for a response signal, and transmits the response signal including the generated authentication key in the second frequency band, from the second communication device.

Abstract: An on-vehicle control device includes a transmission unit transmitting to a mobile device a response request signal requesting a response in response to operation of instructing a start of a driving source causing a vehicle to drive. An authentication unit authenticates the mobile device and performs start control of the driving source depending on success or failure of authentication by the authentication unit. A determination unit determines a presence or an absence of unauthorized authentication for the authentication unit. A detection unit detects an authorized occupant for the vehicle. A start prohibition unit prohibits the start of the driving source when the determination unit determines that unauthorized authentication is present for the authentication unit. A start permission unit permits the start of the driving source regardless of determination by the determination unit when the detection unit detects the occupant.

Abstract: A signal strength obtaining unit obtains, first received signal strengths at a receiver over a first period of time in which a target signal is transmitted, and obtains second signal strengths at the receiver over a second period of time in which the target signal is not transmitted. A signal strength calculating unit calculates a signal strength of the received target signal by using a first method based on an assumption that a noise signal whose amplitude changes is superimposed on the target signal when a variance value of the second signal strengths exceeds a first threshold, and calculates the signal strength of the received target signal by using a second method based on an assumption that a noise signal whose amplitude is constant is superimposed on the target signal when the variance value of the second signal strengths is less than or equal to the first threshold.

Abstract: A vehicle-side device that is provided on the vehicle side and transmits a signal at a first frequency, and a portable device that is able to be carried by a user and transmits a signal at a second frequency are included. The portable device transmits a signal of data based on a reception intensity of a measurement signal transmitted from the vehicle-side device, and the vehicle-side device performs predetermined control on the basis of the data based on the reception intensity of the measurement signal transmitted from the portable device. The vehicle-side device transmits a start-up signal to the portable device, the portable device transmits a request signal or a signaling signal to the vehicle-side device at predetermined time intervals when receiving the start-up signal, and the vehicle-side device transmits the measurement signal to the portable device each time the vehicle-side device receives the request signal or the signaling signal.

Abstract: A vehicle-mounted device includes a control unit that generates a request signal, a transmission unit that sequentially transmits a request signal generated by the control unit from a plurality of respective transmission antennas, a reception unit that receives a response signal to the request signal, and a storage unit that stores a history of information included in a response signal received by the reception unit, and, in a case where the response signal is newly received by the reception unit, the control unit determines whether or not a vehicle is caused to perform a predetermined operation on the basis of the information included in the response signal and the history of the information included in the response signal stored in the storage unit.

Abstract: A vehicle-side device includes a vehicle-side control unit that controls transmission of a request signal and performs predetermined control when authentication is successful on the basis of an answer signal, a portable device includes a portable-device control unit that detects reception intensity information of the request signal transmitted from the vehicle-side device and transmits an answer signal based on the reception intensity, the vehicle-side control unit controls a vehicle-side transmission unit so that the vehicle-side transmission unit transmits the request signal including the determination signal having an intensity level different for each section, and the vehicle-side control unit or the portable-device control unit determines whether or not the request signal is a true signal on the basis of a fluctuation in the reception intensity in each section of the determination signal received by the portable device.

Abstract: A moving device receives a 100% duty measurement signal transmitted from an in-vehicle device. The receive strength of the received measurement signal is divided into unit time, and the average value of the receive strength for each unit time is determined The maximum value and the minimum value of the average value are determined, and the ratio between the maximum value and the minimum value is transmitted to the in-vehicle device as signal strength fluctuation information. The in-vehicle device determines that a communication state is abnormal if it is determined that the fluctuation ratio exceeds a predetermined threshold.

Abstract: A vehicle-mounted device includes a control unit that generates a request signal, a transmission unit that sequentially transmits a request signal generated by the control unit from a plurality of respective transmission antennas, a reception unit that receives a response signal to the request signal, and a storage unit that stores a history of information included in a response signal received by the reception unit, and, in a case where the response signal is newly received by the reception unit, the control unit determines whether or not a vehicle is caused to perform a predetermined operation on the basis of the information included in the response signal and the history of the information included in the response signal stored in the storage unit.

Abstract: Since two pieces of fraudulently acquired authentication information A are transmitted from a transmission device at relatively short time intervals, a time Tp is relatively short, whereas the two pieces of authentication information A are received by a control device at relatively long time intervals, an elapsed time TMAX is relatively long and this relationship is different from that in a case where there is no fraudulent work. Thus, it is possible to accurately determine whether received authentication information is fraudulently acquired information on the basis of a relationship between a code included in the authentication information received in the control device and a code that is being selected in the control device, and a relationship between first time information and second time information included in the authentication information received in the control device.

Abstract: A keyless entry system includes a first communication apparatus and a second communication apparatus. The first communication apparatus includes first transmitter, first receiver, and first two-way communication device. The second communication apparatus includes second receiver, second transmitter, and second two-way communication device. The first communication apparatus or the second communication apparatus includes electric field strength detector. In a case where the first communication apparatus and the second communication apparatus are not connected to each other through two-way communication or electric field strength detected by the electric field strength detector is less than a predetermined value, the first communication apparatus stops a call function of the first transmitter or the second communication apparatus stops a wait function of the second receiver.

Abstract: A transmission device includes a transmission-side code selection unit that sequentially selects one code from a predetermined code sequence each time authentication information including an authentication code is transmitted to a control device, an authentication information generation unit that generates the authentication information including a code that is being selected in the transmission-side code selection unit, a transmission unit that wirelessly transmits the generated authentication information, and a control unit that outputs, from the transmission unit, interference waves that interfere with reception of the authentication information in the control device in a period of at least a portion of an interval period from transmission of one piece of authentication information to transmission of next authentication information.

Abstract: An electronic key device includes a portable device capable of being carried by a user, and a vehicle-mounted device configured to perform mutual communication with the portable device to perform predetermined control. The vehicle-mounted device includes a plurality of antennas that is provided in different positions of a vehicle and is configured to transmit radio waves every predetermined time. A response signal based on the reception strength of the radio waves transmitted from the plurality of antennas is transmitted from the portable device to the vehicle-mounted device. The vehicle-mounted device determines that a moving direction of the portable device heads for any one of the antennas based on the response signal, and when it is determined that a distance between the vehicle and the portable device is equal to or less than a predetermined threshold, control is performed such that a door becomes unlocked.

Abstract: A vehicle-side device includes a vehicle-side control unit that controls transmission of a request signal and performs predetermined control when authentication is successful on the basis of an answer signal, a portable device includes a portable-device control unit that detects reception intensity information of the request signal transmitted from the vehicle-side device and transmits an answer signal based on the reception intensity, the vehicle-side control unit controls a vehicle-side transmission unit so that the vehicle-side transmission unit transmits the request signal including the determination signal having an intensity level different for each section, and the vehicle-side control unit or the portable-device control unit determines whether or not the request signal is a true signal on the basis of a fluctuation in the reception intensity in each section of the determination signal received by the portable device.

Abstract: A keyless entry apparatus includes: a vehicle-side device provided in a vehicle, the device including a vehicle-side transmitter that transmits a request signal and a vehicle-side receiver that receives an answer signal; and a mobile device including a mobile device receiver that receives the request signal and a mobile device transmitter that transmits the answer signal in accordance with the request signal. The vehicle-side device includes at least one modulator that modulates the request signal, the mobile device includes at least one demodulator that demodulates the request signal in accordance with the corresponding at least one modulator, and the request signal includes a signal modulated by the at least one modulator. Switching between modulation methods for the request signal is performed at at least one timing.

Abstract: A vehicle-side device that is provided on the vehicle side and transmits a signal at a first frequency, and a portable device that is able to be carried by a user and transmits a signal at a second frequency are included. The portable device transmits a signal of data based on a reception intensity of a measurement signal transmitted from the vehicle-side device, and the vehicle-side device performs predetermined control on the basis of the data based on the reception intensity of the measurement signal transmitted from the portable device. The vehicle-side device transmits a start-up signal to the portable device, the portable device transmits a request signal or a signaling signal to the vehicle-side device at predetermined time intervals when receiving the start-up signal, and the vehicle-side device transmits the measurement signal to the portable device each time the vehicle-side device receives the request signal or the signaling signal.

Abstract: A moving device receives a 100% duty measurement signal transmitted from an in-vehicle device. The receive strength of the received measurement signal is divided into unit time, and the average value of the receive strength for each unit time is determined The maximum value and the minimum value of the average value are determined, and the ratio between the maximum value and the minimum value is transmitted to the in-vehicle device as signal strength fluctuation information. The in-vehicle device determines that a communication state is abnormal if it is determined that the fluctuation ratio exceeds a predetermined threshold.

Abstract: A keyless entry apparatus includes: a vehicle-side device provided in a vehicle, the device including a vehicle-side transmitter that transmits a request signal and a vehicle-side receiver that receives an answer signal; and a mobile device including a mobile device receiver that receives the request signal and a mobile device transmitter that transmits the answer signal in accordance with the request signal. The vehicle-side device includes at least one modulator that modulates the request signal, the mobile device includes at least one demodulator that demodulates the request signal in accordance with the corresponding at least one modulator, and the request signal includes a signal modulated by the at least one modulator. Switching between modulation methods for the request signal is performed at at least one timing.

Abstract: In a keyless entry system including an in-vehicle device, and a portable device operated by a built-in battery, a request signal is transmitted from the in-vehicle device to the portable device so that wireless communication is performed between the in-vehicle device and the portable device, the portable device can set first sensitivity that is predetermined sensitivity and second sensitivity that is higher sensitivity than the first sensitivity and at which a detection area for the request signal is wide, as detection sensitivity for detecting the request signal, sets the detection sensitivity to the second sensitivity when determining that the portable device is in the vehicle's interior or within the predetermined distance from the vehicle, and sets the detection sensitivity to the first sensitivity when determining that the portable device is not in or comes to be not in the vehicle's interior or within the predetermined distance from the vehicle.

Abstract: A keyless entry system includes a first communication apparatus and a second communication apparatus. The first communication apparatus includes first transmitter, first receiver, and first two-way communication device. The second communication apparatus includes second receiver, second transmitter, and second two-way communication device. The first communication apparatus or the second communication apparatus includes electric field strength detector. In a case where the first communication apparatus and the second communication apparatus are not connected to each other through two-way communication or electric field strength detected by the electric field strength detector is less than a predetermined value, the first communication apparatus stops a call function of the first transmitter or the second communication apparatus stops a wait function of the second receiver.