Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Kabushiki Kaisha Tokai Rika Denki Seisakusho

Toyota Jidsoha Kabushiki Kaisha

Hiroko Murakami

Arinobu Kimura

Hiroki Okada

Kazuhiro Nakashima

Noriaki Okada

Tomoyuki Funayama

Tomoo Kakegawa

Taichi Yamaguchi

Noriyasu Onishi

Daigo Akutsu

Satoshi Nagao

Hironori Mitsubayashi

Shinji Hasegawa

Toshimasa Shibagaki

Mitsuru Ogawa

A vehicle control system includes a first transmitter that transmits a predetermined first signal over a predetermined area, a first receiver and a second receiver that receive second and third signals, a detector that detects the field intensities of the received signals, a second transmitter that transmits a signal through an RF-band radio wave, and an electronic control unit that operates an in-vehicle device based on the third signal received by the first receiver and restrains or prohibits the in-vehicle device from being operated based on the third signal when the field intensity of the third signal is lower than the field intensity of the second signal by a value greater than a predetermined standard.

Vehicle control system and vehicle control device

A radio communication system, in which radio communication is carried out between an in-vehicle communication device, mounted in a vehicle, and a radio communication terminal to detect a relative distance therebetween, includes an output control unit that controls a radio wave intensity of a measuring signal, which is sent from one of the in-vehicle communication device and the radio communication terminal, at a pre-set predetermined value; and a measuring unit that performs distance measuring on a vehicle side based on the radio wave intensity of the measuring signal controlled at the predetermined value or on a signal to which a value of the radio wave intensity of the measuring signal is added as information.

Radio communication system and distance measuring method

A wireless communication method is provided. This method includes: selecting one of a plurality of predetermined frequency bands each time a switch operation is manually performed in a transmitter, and then using the selected frequency band to transmit a radio signal corresponding to the switch operation for a predetermined specified transmission time; in a receiver apparatus, receiving the transmitted wireless signal, and then recognizing the content of a command that has already been assigned in accordance with the switch operation; and defining an intermittent reception standby period, which is repeated at a predetermined cycle for each of the frequency bands.

Wireless communication method and wireless communication apparatus

A remote control system includes a mobile device and a receiver connected to a control target. The mobile device includes an input unit accepting user's input operation; an operation signal transmission unit wirelessly transmitting an operation signal corresponding to the input operation during the input operation; a frequency switching determination unit determining whether to switch the transmission frequency band from a first frequency band to a second frequency band based on at least any one of a manner of the input operation and a state of wireless communication; and a transmission frequency switching unit switching the transmission frequency band when the frequency switching determination unit determines to switch the transmission frequency band. The receiver includes an operation signal reception unit receiving the operation signal; and a control unit controlling the control target on the basis of the received operation signal.

Remote control system and mobile device

In an in-vehicle device control system, an in-vehicle device is controlled based on a checkup result of checkup operation, in which a checkup about a portable device is performed by mutual communication of transmitting a request signal from a vehicle-side unit mounted on a vehicle and transmitting in return a response signal from the portable device in response to the request signal. If the checkup is unsuccessful, the mutual communication is performed again by switching the communication frequency to perform the checkup again. When a user operates a door lock sensor, the vehicle-side unit performs an exterior checkup first. If the checkup is successful, a communication frequency, by which the checkup was performed successfully, is stored in a memory. The vehicle-side unit sets the communication frequency stored in the memory as a communication frequency, which is to be designated to the portable device, for performing an interior checkup next time.

In-vehicle device control system

A frequency switching terminal is provided to input a signal for switching frequencies of a reception circuit. A smart ECU is connected to the frequency switching terminal via a connection cable. When the signal for switching the frequencies is inputted into an external input terminal of the reception circuit from the smart ECU via the frequency switching terminal, the reception circuit receives a first electric wave transmitted from a portable terminal for smart entry. In contrast, when the signal for switching the frequencies is not inputted into the external input terminal of the reception circuit from the smart ECU via the frequency switching terminal, the reception circuit receives a second electric wave transmitted from a tire sensor.

In-vehicle apparatus

A mobile device includes a transmitting unit that, each time an ON operation of a switch in a first mode is performed, transmits a wireless signal corresponding to the first mode ON operation by changing a frequency band among three or more frequency bands and that, when an ON operation of the switch in a second mode is performed, transmits a wireless signal, corresponding to the second mode ON operation, in the frequency band selected at that time. The transmitting unit includes a frequency band computing unit that selects one of the three or more frequency bands through a computation for changing a communication environment when the second mode ON operation of the switch is repeatedly performed. A receiver of the in-vehicle device receives a wireless signal transmitted from the transmitting unit and recognizes command information allocated in advance in correspondence with each ON operation mode of the switch.

Wireless communication system and communication method for wireless communication system

An in-vehicle device controller includes: an in-vehicle unit for controlling an in-vehicle device; and a portable device. The in-vehicle unit includes a request signal transmitter for transmitting a request signal including random information to the portable device. The portable device transmits a response signal in response to the request signal at multiple frequencies according to a switching pattern corresponding to a part of the random information. The in-vehicle unit further includes: a frequency specifying device for specifying the switching pattern based on the part of the random information; and a reception determination device for executing a reception determination process of the response signal based on a specified switching pattern. The in-vehicle device identifies the portable device according to the reception determination process, and controls the in-vehicle device according to an identification of the portable device.

In-vehicle device controller

A vehicle receiver system includes: a receiver provided in a vehicle cabin, wherein an operating mode of the receiver includes a first mode for receiving a first wireless signal transmitted from a portable key, and a second mode for receiving a second wireless signal relating to a tire air pressure, transmitted from a transmitter provided on a tire; and a key verification device that performs key verification on the portable key in the vehicle cabin on the basis of the first wireless signal. In a predetermined situation, the receiver is configured such that the operating mode of the receiver is switched between the first mode and the second mode, and proportion of a second mode operation time in which the receiver operates in the second mode is set to be greater when a vehicle speed is relatively high than when the vehicle speed is relatively low.

Vehicle receiver system, vehicle receiver, and operating method for vehicle receiver

A radio communication system includes: a receiver that is configured to receive a first radio wave sent according to a remote keyless entry system and a second radio wave sent according to a tire pressure monitoring system; and a reception mode switching unit that sets a reception mode of the receiver to a first reception mode, in which the first radio wave is received, when an ignition switch of a vehicle is off, and sets the reception mode to a second reception mode, in which the second radio wave is received, when the ignition switch of the vehicle is on. If the reception mode switching unit receives a first request to set the reception mode to the first reception mode while the reception mode is set to the second reception mode, the reception mode switching unit sets the reception mode to the first reception mode.

Remote keyless entry and tire pressure monitoring radio communication system, receiver, and communication method that switches a reception mode of a receiver between a first reception mode and a second reception mode

A door lock control apparatus includes a lock switch on an exterior of a vehicle, a controller, and a check device. The controller performs a first key check in response to a lock command inputted through the lock switch. The first key check determines whether an electronic key specific to the vehicle is located outside around the vehicle based on a response from the key. The check device has previously performed a second key check, after the key has been put into a situation in which the key might have been moved from inside to outside the vehicle. The second key check determines whether the key is located inside the vehicle based on the response from the key. The check device stores a result of the second key check as a stored check record, which is then immediately available for checking when the controller responds to an inputted lock command.

Door lock control apparatus for vehicle

A receiver () that receives a radio signal transmitted from a transmitter includes a receiving unit () that receives a signal that is wirelessly transmitted from the transmitter at one of a plurality of transmission frequencies, a receiving frequency change determining unit () that determines whether a receiving frequency is to be changed, based on the signal received by the receiving unit, and a communication error acceptance time setting unit () that sets an acceptance time as a period of time for which communication errors after confirmation of a receiving operation are accepted, based on the signal received by the receiving unit. The communication error acceptance time setting unit sets the acceptance time to different periods of time, depending on whether the receiving frequency change determining unit determines that the receiving frequency is to be changed.

Receiver, wireless communication system, and receiving method

A vehicle control device has first and second transmission circuits that communicate by radio with a portable unit and also has a control section that, when the portable unit is confirmed to be correct, engages in a permission mode that permits the start of an engine. The first and second transmission circuits transmit first and second request signals from first and second transmission antennas to first and second communicatable areas respectively. When a back door is detected to be open, the control section does not permit the start of the engine even if an ID code signal is returned from the portable unit in response to the second request signal.

Vehicle control device

In an in-vehicle device control system, a vehicle-side unit mounted in a vehicle controls an in-vehicle device in accordance with a result of checkup about a portable device performed by mutual communications, in which the portable device returns a response signal in response to a request signal transmitted from the vehicle-side unit. An ECU of the vehicle-side unit checks whether it is a regular checkup timing, and performs an exterior checkup if it is determined to be the regular checkup timing. The ECU sets in this case a communication frequency, which is higher in priority order, as a communication frequency to be designated to the portable device.

Growing community of inventors

Toyota, Japan

Hiroko Murakami