WO2018207596A1 - Detection device and tire air pressure monitoring system - Google Patents

Detection device and tire air pressure monitoring system Download PDF

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Publication number
WO2018207596A1
WO2018207596A1 PCT/JP2018/016388 JP2018016388W WO2018207596A1 WO 2018207596 A1 WO2018207596 A1 WO 2018207596A1 JP 2018016388 W JP2018016388 W JP 2018016388W WO 2018207596 A1 WO2018207596 A1 WO 2018207596A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
signal
tire
air pressure
detection device
Prior art date
Application number
PCT/JP2018/016388
Other languages
French (fr)
Japanese (ja)
Inventor
山口　慎二
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2018207596A1 publication Critical patent/WO2018207596A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies

Definitions

  • the present invention relates to a detection device and a tire pressure monitoring system.
  • This application claims priority based on Japanese Patent Application No. 2017-95799 filed on May 12, 2017, and incorporates all the description content described in the above Japanese application.
  • TPMS Tire Pressure ⁇ ⁇ ⁇ Monitoring System
  • a tire air pressure monitoring system detects a tire air pressure, wirelessly transmits a pneumatic signal including information on the air pressure obtained by the detection using a radio wave in the UHF band, and a pneumatic signal wirelessly transmitted from the detection device And a monitoring device that monitors the tire air pressure based on the received air pressure signal.
  • the monitoring device is provided in the vehicle body, and the sensor identifier of each detection device is stored in the memory in association with the four tire positions where the tire is provided in the vehicle.
  • the monitoring device is connected to four LF transmitting antennas arranged in the vicinity of each tire.
  • the monitoring device transmits a request signal including a corresponding sensor identifier from each LF transmission antenna corresponding to each tire position to each tire position using a radio wave in an LF (Low Frequency) band. Since the communication range of each LF transmission antenna is basically limited to the range of the corresponding tire position, the monitoring device can transmit a request signal to each detection device provided in each tire.
  • the detection device is provided in each of the right front, left front, right rear, and left rear tires, and when the sensor identifier included in the received request signal matches the sensor identifier of the own device, the detection device is obtained.
  • Air pressure signals including air pressure are transmitted wirelessly.
  • the monitoring device receives the air pressure signal transmitted from each detection device, and monitors the air pressure of each tire.
  • TFA Transire Fill Assist
  • Patent Document 1 discloses a keyless entry device having a tire air pressure monitoring function.
  • the keyless entry device sets the receiving unit to the tire pressure monitoring mode when the vehicle ignition switch is turned on, sets the receiving unit to continuous operation, and sets the receiving unit to the keyless entry mode when the ignition switch is turned off. Is set to intermittent operation.
  • the detection device is a detection device that detects the air pressure of a tire provided in a vehicle when a request signal is received, and transmits a pneumatic signal including information on the air pressure obtained by the detection.
  • a transmitting unit that continuously transmits a predetermined signal in accordance with the air pressure
  • a receiving unit that receives a limiting signal instructing limiting transmission of the predetermined signal
  • the receiving unit And a control unit that restricts transmission of the predetermined signal by the transmitting unit when the limiting signal is received.
  • the wireless frequency band used in the vehicle communication system that performs wireless communication with the portable device to lock and unlock the vehicle, etc. is the same as the frequency band of the signal wirelessly transmitted from the detection device of the tire pressure monitoring system. For this reason, radio wave competition may occur, and each system may not operate normally. In particular, when the tire air pressure increases or decreases, a predetermined signal is spontaneously transmitted from the detection device, so that there is a high possibility that a signal transmitted from the detection device and a signal transmitted from the portable device will interfere with each other.
  • An object of the present disclosure is to provide a detection device capable of suppressing interference between a signal transmitted from a portable device used for vehicle locking / unlocking control and the like and a signal transmitted from a detection device used for monitoring tire pressure. It is to provide a tire pressure monitoring system.
  • a detection device capable of suppressing interference between a signal transmitted from a portable device used for control of locking and unlocking of a vehicle and a signal transmitted from a detection device used for monitoring tire pressure, and It is possible to provide a tire pressure monitoring system.
  • a detection device is a detection device that detects the air pressure of a tire provided in a vehicle when a request signal is received, and transmits an air pressure signal including information on the air pressure obtained by the detection.
  • a transmitting unit that continuously transmits a predetermined signal according to the air pressure, and a receiving unit that receives a limiting signal instructing limitation of transmission of the predetermined signal;
  • a control unit configured to limit transmission of the predetermined signal by the transmission unit when the reception unit receives the restriction signal.
  • the detection device when the detection device receives a request signal transmitted from the outside, the detection device transmits an air pressure signal. Further, when the tire air pressure increases or decreases at a speed equal to or higher than the threshold, a predetermined signal is continuously transmitted according to the air pressure. For example, when the tire is filled with air, the detection device continuously transmits a predetermined signal. Further, when the tire air pressure rapidly decreases due to puncture or the like, the detection device continuously transmits a predetermined signal. However, when receiving a restriction signal transmitted from the outside, the detection device restricts transmission of the predetermined signal and suppresses continuous transmission of the predetermined signal. Therefore, by controlling the operation mode of the detection device, it is possible to suppress interference between the signal transmitted from the external communication device and the signal transmitted from the detection device.
  • the external communication device is, for example, a portable device that performs wireless communication with a vehicle in order to lock and unlock the vehicle door.
  • control unit cancels the restriction of the predetermined signal by the transmission unit when the reception unit receives a release signal instructing the release of the restriction.
  • the detection device when the transmission of the predetermined signal is restricted, the detection device removes the restriction when receiving the release signal transmitted from the outside. Therefore, in a situation where interference between the signal transmitted from the external communication device and the signal transmitted from the detection device does not cause a problem, the release signal is transmitted to the detection device, so that the tire can be filled with air or abnormal in air pressure. Monitoring can be resumed.
  • the tire pressure monitoring system performs wireless communication between the detection device of the aspect (1) or the aspect (2) provided in each of the plurality of tires of the vehicle and the detection device, And a monitoring device for monitoring the air pressure of each tire.
  • the monitoring device transmits a control signal to the detection device, thereby transmitting a signal transmitted from an external communication device and a signal transmitted from the detection device. It becomes possible to suppress interference with.
  • the monitoring device transmits the limit signal when a predetermined time has elapsed after the ignition switch of the vehicle is switched from the off state to the on state.
  • the monitoring device transmits the limit signal when an ignition switch of the vehicle is switched from an on state to an off state.
  • wireless communication related to locking / unlocking of the vehicle door is more likely to be important than monitoring of the tire air pressure.
  • the continuous transmission of the signal is restricted, and interference between the signal transmitted from the portable device for locking and unlocking the vehicle door and the signal transmitted from the detection device is suppressed.
  • the monitoring device transmits a release signal instructing release of the restriction when an ignition switch of the vehicle is switched from an off state to an on state.
  • wireless communication related to monitoring the tire air pressure before traveling may be more important than wireless communication related to locking and unlocking of the vehicle door. Because the price is high, the above restriction is lifted. Therefore, at the time of switching on the ignition, it is possible to monitor tire air filling and rapid increase / decrease in tire air pressure.
  • the vehicle has a function of locking and unlocking the vehicle by performing wireless communication with a portable device, and the detection device and the portable device transmit signals using radio waves in overlapping frequency bands.
  • a configuration for transmission is preferable.
  • FIG. 1 is a conceptual diagram showing a configuration example of a vehicle communication system according to an embodiment of the present invention.
  • the vehicle communication system according to the present embodiment functions as a tire air pressure monitoring system, and is applied to each of the vehicle-mounted device (monitoring device) 1 provided at an appropriate location of the vehicle body and the wheels of the plurality of tires 3 provided in the vehicle C.
  • a plurality of detection devices 2 provided and a notification device 4 are provided.
  • the detection device 2 detects the air pressure of the tire 3 provided with the device itself.
  • the vehicle-mounted device 1 wirelessly communicates with each detection device 2 to acquire information related to the air pressure of each tire 3, and the air pressure of each tire 3 is obtained using the notification device 4. Inform.
  • the vehicle communication system includes a portable device 9 that transmits and receives signals to and from the in-vehicle device 1, and the in-vehicle device 1 detects the position of the portable device 9 by performing a radio signal with the portable device 9. .
  • the in-vehicle device 1 and the portable device 9 constitute a smart entry (registered trademark) system that controls the locking and unlocking of the door.
  • a plurality of LF transmission antennas 14 a corresponding to the respective tires 3 are connected to the in-vehicle device 1.
  • the four LF transmitting antennas 14a are provided at the right front, right rear, left rear, and left front tire positions of the vehicle C.
  • the tire position is a position around the tire house and its surroundings, and is a position where the detection device 2 provided in each tire 3 can individually receive a signal transmitted from each LF transmission antenna 14a.
  • an alternate long and short dash line indicates a range in which the detection apparatus 2 can receive a request signal transmitted from each LF transmission antenna 14a.
  • the in-vehicle device 1 is connected to a plurality of LF transmission antennas 14b for detecting the position of the portable device 9.
  • the LF transmission antenna 14b is provided in the vicinity of the vehicle door and in the vehicle.
  • the LF transmission antenna 14a according to the present embodiment also functions as an antenna that transmits a position detection signal for detecting the position of the portable device 9 to the portable device 9, and the in-vehicle device 1 includes the LF transmission antenna 14a and the LF transmission antenna 14a. Wireless communication is performed with the portable device 9 using 14b, and the position of the portable device 9 is detected.
  • a unidirectional communication method and a bidirectional communication method as a method of wireless communication performed by the in-vehicle device 1 with the detection device 2.
  • the vehicle-mounted device 1 receives the air pressure signal mainly by bidirectional communication, and receives the air pressure signal mainly by unidirectional communication when the vehicle C is traveling.
  • the detection device 2 spontaneously transmits an air pressure signal at a predetermined timing.
  • the vehicle-mounted device 1 stores a relationship between each tire position where the tire 3 is provided and a sensor identifier of the detection device 2 provided on the tire 3 at the tire position.
  • each tire 3 is used by using the sensor identifier included in the air pressure signal.
  • the air pressure can be recognized.
  • the detection device 2 continuously transmits a predetermined signal according to the tire pressure.
  • the detection device 2 continuously transmits a predetermined signal when the air pressure of the tire 3 suddenly increases or decreases, for example, when the tire 3 is filled with air.
  • the portable device 9 transmits another predetermined signal when the tire air pressure decreases rapidly.
  • the vehicle-mounted device 1 transmits a request signal for requesting the air pressure signal of the tire 3 to each detection device 2 from each LF transmission antenna 14a to each detection device 2 by radio waves in the LF (Low Frequency) band.
  • the request signal includes the sensor identifier of the detection device 2 provided in the tire 3 at the tire position that is the transmission destination.
  • the detection device 2 receives a request signal including the same sensor identifier as the sensor identifier of its own device, the detection device 2 detects the air pressure of the tire 3, and detects the air pressure obtained by the detection and the air pressure signal including the sensor identifier of the own device as UHF. It transmits to the vehicle-mounted device 1 by radio waves in the (Ultra High Frequency) band.
  • the in-vehicle device 1 includes an RF receiving antenna 13a, receives the air pressure signal transmitted from each detection device 2 by the RF receiving antenna 13a, and acquires information on the air pressure of each tire 3 from the air pressure signal.
  • LF band and the UHF band are examples of a radio wave band used when performing wireless communication, and are not necessarily limited thereto.
  • the notification device 4 is connected to the in-vehicle device 1 via a communication line, and the in-vehicle device 1 transmits information related to the acquired air pressure to the notification device 4.
  • the notification device 4 receives the information transmitted from the in-vehicle device 1 and notifies the air pressure of each tire 3.
  • the vehicle equipment 1 issues a warning by the notification device 4 when the air pressure of the tire 3 is less than a predetermined threshold value. Further, the notification device 4 notifies information such as air filling of the tire 3 and a rapid decrease in tire air pressure.
  • FIG. 2 is a block diagram showing a configuration example of the in-vehicle device 1 according to the embodiment of the present invention.
  • the in-vehicle device 1 includes an in-vehicle control unit 11 that controls the operation of each component of the own device.
  • a storage unit 12, an in-vehicle receiving unit 13, an in-vehicle transmitting unit 14, and an input / output unit 15 are connected to the in-vehicle control unit 11.
  • the in-vehicle control unit 11 is a microcomputer having, for example, one or a plurality of CPUs (Central Processing Units), a multi-core CPU, a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, and the like.
  • the CPU of the in-vehicle control unit 11 is connected to the storage unit 12, the in-vehicle reception unit 13, the in-vehicle transmission unit 14, and the input / output unit 15 through an input / output interface.
  • the in-vehicle controller 11 controls the operation of each component by executing a control program stored in the storage unit 12, and executes a tire pressure monitoring process, a vehicle door locking / unlocking process, and the like according to the present embodiment. .
  • the storage unit 12 is a nonvolatile memory such as an EEPROM (ElectricallyrErasable Programmable ROM) or a flash memory.
  • storage part 12 has memorize
  • the storage unit 12 stores an identifier table.
  • the identifier table corresponds to a plurality of tire positions, an antenna identifier for identifying the LF transmission antenna 14a disposed in the vicinity of the tire position, and a sensor identifier of the detection device 2 provided in the tire 3 at the tire position. I remember it.
  • An RF receiving antenna 13 a is connected to the in-vehicle receiving unit 13.
  • the in-vehicle receiving unit 13 receives a signal transmitted from the detection device 2 or the portable device 9 using radio waves in the RF band by the RF receiving antenna 13a.
  • the in-vehicle receiver 13 is a circuit that demodulates the received signal and outputs the demodulated signal to the in-vehicle controller 11.
  • the in-vehicle receiving unit 13 receives an air pressure signal transmitted from the detection device 2.
  • the in-vehicle receiving unit 13 receives a response signal transmitted from the portable device 9 when detecting the position of the portable device 9.
  • the response signal includes information for detecting the position of the portable device 9.
  • a UHF band of 300 MHz to 3 GHz is used as a carrier wave, but the carrier wave is not limited to this frequency band.
  • the in-vehicle transmission unit 14 is a circuit that modulates the signal output from the in-vehicle control unit 11 into an LF band signal, and transmits the modulated signals to the detection device 2 from the plurality of LF transmission antennas 14a and 14b, respectively.
  • the carrier wave uses the LF band of 30 kHz to 300 kHz, but is not limited to this frequency band. For example, when detecting the air pressure of the tire 3 at an arbitrary timing, the in-vehicle transmission unit 14 transmits a request signal for requesting air pressure information from the LF transmission antenna 14 a to each detection device 2.
  • the in-vehicle transmission unit 14 sends a signal for switching the operation mode of the detection device 2 at a required timing, that is, a restriction signal for restricting the operation of the detection device 2 and a release signal for releasing the restriction from the LF transmission antenna 14a.
  • the restriction signal restricts the operation in which the detection device 2 continuously transmits a predetermined signal using radio waves in the UHF band when the tire 3 is filled with air or when the tire 3 is punctured.
  • the vehicle-mounted transmission part 14 transmits the signal for a position detection from LF transmission antenna 14a, 14b, when performing the position detection of the portable apparatus 9.
  • the input / output unit 15 is an interface for inputting and outputting signals, and is connected to the notification device 4, the vehicle speed sensor 5, the ignition switch 6, the positioning device 7, and the door ECU 8.
  • the input / output unit 15 may be a communication circuit that performs communication according to a communication protocol such as CAN (Controller Area Network) or LIN (Local Interconnect Network).
  • the input / output unit 15 transmits information related to the air pressure of the tire 3 to the notification device 4 under the control of the in-vehicle control unit 11. Also.
  • the in-vehicle control unit 11 acquires signals output from the vehicle speed sensor 5, the ignition switch 6, and the positioning device 7 via the input / output unit 15.
  • the notification device 4 is, for example, a display unit such as a meter display, a multi-information display, a head-up display, or the like that notifies information related to the air pressure of the tire 3 output from the input / output unit 15 by an image.
  • the notification device 4 displays the air pressure information of each tire 3 provided in the vehicle C as an image and a numerical value imitating the vehicle C. Further, the notification device 4 notifies the tire 3 that the air pressure is filled, the air pressure of the tire 3 is rapidly decreasing, based on the information transmitted from the in-vehicle control unit 11.
  • the notification device 4 may be an audio device or the like provided with a display unit or a speaker for notification by image or sound.
  • the display unit is a liquid crystal display, an organic EL display, or the like.
  • the notification device 4 may be configured to include a buzzer.
  • the buzzer is an audio output device that outputs a warning sound notifying that the tire 3 is filled with air pressure, a decrease in tire air pressure, or the like.
  • the in-vehicle control unit 11 can output a warning sound by outputting a buzzer on signal to the buzzer via the input / output unit 15.
  • the vehicle speed sensor 5 includes, for example, a magnetic pickup that transmits a signal proportional to the rotational speed of an axle provided in the vehicle C, a non-contact sensor that includes a hall element, and a counting circuit that measures the number of pulses from the non-contact sensor. And detecting the speed of the vehicle C by measuring the number of pulses.
  • the non-contact sensor is an example of the vehicle speed sensor 5 and is not limited to such a structure.
  • the vehicle speed sensor 5 may be configured to acquire information on the position of the vehicle C detected by GPS and detect the speed of the vehicle C based on a change in the position of the vehicle C.
  • An ignition switch 6 signal corresponding to the operation state of the ignition switch 6 is input to the input / output unit 15, and the vehicle-mounted control unit 11 receives the ignition switch 6 based on the ignition switch 6 signal input to the input / output unit 15. Can be recognized.
  • the positioning device 7 includes a GPS receiver.
  • the GPS receiver constitutes a GPS system together with an artificial satellite (GPS satellite), receives radio waves from the artificial satellite, and detects its own position.
  • the positioning device 7 outputs the current position information to the in-vehicle control unit 11 in response to the request from the in-vehicle control unit 11.
  • the door ECU 8 includes an actuator that drives a locking / unlocking device that locks and unlocks the vehicle door.
  • the vehicle-mounted device 1 detects the position of the portable device 9, authenticates the portable device 9, determines whether the portable device 9 is outside the vehicle,
  • a lock signal or an unlock signal is transmitted to the door ECU 8.
  • the vehicle equipment 1 detects the position of the portable device 9 when the ignition switch 6 is turned off and the vehicle door is opened and closed.
  • the in-vehicle device 1 transmits a locking signal to the door ECU 8.
  • the door ECU 8 drives the locking / unlocking device to lock the vehicle door. Further, the door ECU 8 can control the operation of the locking / unlocking device in accordance with the operation of the locking / unlocking switch in the vehicle, and can lock or unlock the vehicle door, and communicates information indicating the locking / unlocking state of the vehicle door. It can transmit to the vehicle equipment 1 via a line. The in-vehicle device 1 can recognize the locked / unlocked state of the vehicle door by receiving the information transmitted from the door ECU 8 at the input / output unit 15.
  • FIG. 3 is a block diagram showing a configuration example of the detection apparatus 2 according to the embodiment of the present invention.
  • the detection device 2 includes a sensor control unit (control unit) 21 that controls the operation of each component of the detection device 2.
  • a sensor storage unit 22, a sensor transmission unit (transmission unit) 23, a sensor reception unit (reception unit) 24, an air pressure detection unit 25, a temperature detection unit 26, and an acceleration sensor 27 are connected to the sensor control unit 21.
  • the sensor control unit 21 is a microcomputer having, for example, one or a plurality of CPUs, a multi-core CPU, a ROM, a RAM, an input / output interface, and the like.
  • the CPU of the sensor control unit 21 is connected to the sensor storage unit 22, the sensor transmission unit 23, the sensor reception unit 24, the air pressure detection unit 25, the temperature detection unit 26, and the acceleration sensor 27 via an input / output interface.
  • the sensor control unit 21 reads a control program stored in the sensor storage unit 22 and controls each unit.
  • the detection device 2 includes a battery (not shown) and operates with electric power from the battery.
  • the sensor storage unit 22 is a nonvolatile memory.
  • the sensor storage unit 22 stores a control program for the CPU of the sensor control unit 21 to perform processing related to detection and transmission of the air pressure of the tire 3. Further, a unique sensor identifier for identifying the own device and the other detection device 2 is stored.
  • An RF transmission antenna 23 a is connected to the sensor transmission unit 23.
  • the sensor transmission unit 23 modulates the air pressure signal generated by the sensor control unit 21 into a UHF band signal, and transmits the modulated air pressure signal using the RF transmission antenna 23a.
  • the sensor transmission part 23 transmits a predetermined signal continuously using RF transmission antenna 23a, when the air pressure of the tire 3 increases / decreases rapidly. For example, when the air filling of the tire 3 is performed, and the air pressure of the tire 3 is rapidly reduced, a predetermined signal is transmitted.
  • the sensor receiving unit 24 is connected to an LF receiving antenna 24a.
  • the sensor receiving unit 24 receives a signal transmitted from the vehicle-mounted device 1 using radio waves in the LF band by the LF receiving antenna 24 a and outputs the received signal to the sensor control unit 21.
  • the signal transmitted from the vehicle-mounted device 1 is, for example, a request signal for requesting air pressure information, a signal for instructing switching of the operation mode of the detection device 2, that is, a restriction signal, a release signal, or the like.
  • the air pressure detection unit 25 includes a diaphragm, for example, and detects the air pressure of the tire 3 based on the deformation amount of the diaphragm that changes depending on the magnitude of the pressure.
  • the air pressure detection unit 25 outputs a signal indicating the detected air pressure of the tire 3 to the sensor control unit 21.
  • the temperature detection unit 26 includes, for example, an element whose electric resistance changes with temperature, and detects the temperature of the tire 3 based on the voltage between the elements that changes with temperature change.
  • the temperature detection unit 26 outputs a signal indicating the detected temperature of the tire 3 to the sensor control unit 21.
  • the acceleration sensor 27 detects the acceleration applied to the detection device 2 by the rotation of the tire 3 and outputs an acceleration signal to the sensor control unit 21.
  • the sensor control unit 21 acquires the air pressure and temperature information of the tire 3 from the air pressure detection unit 25 and the temperature detection unit 26 according to the request signal by executing the control program, and sends the information to the air pressure, temperature and detection device 2.
  • a pneumatic signal including a unique sensor identifier or the like is generated and output to the sensor transmission unit 23.
  • the sensor control unit 21 when the tire 3 rotates and an acceleration signal is output from the acceleration sensor 27, the sensor control unit 21 generates an air pressure signal including air pressure, temperature, a sensor identifier unique to the detection device 2, and the like, and a sensor transmission unit To 23. Further, the sensor control unit 21 outputs a predetermined signal to the sensor transmission unit 23 when the air pressure of the tire 3 rapidly increases or decreases. However, when operating in a restriction mode that receives a restriction signal and restricts transmission of the predetermined signal, the sensor control unit 21 does not output the predetermined signal even if air filling or puncture of the tire 3 is detected. .
  • FIG. 4 is a block diagram showing a configuration example of the portable device 9 according to the embodiment of the present invention.
  • the portable device 9 includes a portable control unit 91 that controls the operation of each component of the portable device 9.
  • the portable side control unit 91 is a microcomputer having, for example, one or a plurality of CPUs, a multi-core CPU, and the like.
  • the portable side control unit 91 includes a portable side reception unit 92, a portable side transmission unit 93, a portable side storage unit 94, and a received signal strength measurement unit 95.
  • the portable side control unit 91 reads out a control program, which will be described later, stored in the portable side storage unit 94 and controls the operation of each component unit, thereby controlling the operation of each component unit.
  • the process which transmits the information required for the position detection of 9 to the vehicle equipment 1 is performed.
  • the portable storage unit 94 is a non-volatile memory similar to the storage unit 12.
  • the portable storage unit 94 transmits a response signal including information for detecting the position of the portable device 9 to the in-vehicle device 1 by the portable control unit 91 controlling the operation of each component of the portable device 9.
  • a control program for executing the processing to be performed is stored.
  • the portable-side receiving unit 92 is connected to the portable-side LF receiving antenna 92 a, receives various signals such as a position detection signal transmitted from the vehicle-mounted device 1 using radio waves in the LF band, and sends it to the portable-side control unit 91. Output.
  • the portable-side LF reception antenna 92a is, for example, a three-axis antenna, and a constant received signal strength can be obtained regardless of the orientation or posture of the portable device 9 with respect to the vehicle C.
  • the received signal strength measuring unit 95 detects the received signal strength of each position detection signal transmitted from the plurality of LF transmitting antennas 14a and received by the portable LF receiving antenna 92a, and the detected received signal strength is detected by the portable control unit.
  • 91 is a circuit that outputs the data to 91.
  • the portable side transmission unit 93 is connected to the portable side RF transmission antenna 93a, and transmits a signal corresponding to the signal transmitted from the portable device 9 according to the control of the portable side control unit 91.
  • the portable-side transmitter 93 receives information for detecting the position of the portable device 9 relative to the vehicle-mounted device 1 according to the control of the portable-side controller 91.
  • 95 transmits a response signal including the received signal strength measured.
  • the portable-side transmitter 93 transmits a response signal using UHF radio waves.
  • the UHF band is an example of a radio wave band for transmitting signals, and is not necessarily limited to this.
  • the in-vehicle device 1 can monitor the air pressure of the tire 3 by performing wireless communication with the detection device 2. Specifically, the in-vehicle device 1 transmits a request signal from the LF transmission antenna 14a at an arbitrary timing, and receives an air pressure signal transmitted from the detection device 2 in response to the request signal, whereby the air pressure of each tire 3 is received. Can be detected and monitored. While the vehicle C is traveling, an air pressure signal is spontaneously transmitted from the detection device 2, and the vehicle-mounted device 1 monitors the air pressure of each tire 3 by receiving the air pressure signal transmitted from each detection device 2. can do.
  • a predetermined signal is transmitted from the detection device 2, and the in-vehicle device 1 receives the predetermined signal, thereby filling the air pressure of the tire 3; A puncture or the like can be detected, and the abnormality can be notified using the notification device 4.
  • the vehicle-mounted device 1 detects the position of the portable device 9 at a required timing such as when the request switch is operated, when the engine start button is operated, when the vehicle door is opened and closed after the engine stops, Depending on the position of the machine 9, predetermined processing such as locking / unlocking of the vehicle door, engine starting, and the like is executed.
  • FIG. 5 and 6 are flowcharts showing a processing procedure related to switching of the operation mode of the detection apparatus 2
  • FIG. 7 is a timing chart showing a method of switching the operation mode of the detection apparatus 2.
  • Vehicle state indicates whether the vehicle C is in a parked state, a stopped state, or a traveling state.
  • IG switch state indicates whether the ignition switch 6 is in an on state or an off state.
  • Switchching signal indicates the transmission timing of a switching signal such as a restriction signal and a release signal transmitted from the on-vehicle device 1.
  • a rectangular block with hatching indicates a switching signal for instructing switching to a restriction mode that restricts transmission of a predetermined signal that is transmitted when the tire pressure rapidly increases and decreases. The switching signal which instruct
  • the “TPMS radio signal (detection device)” indicates the operation mode of the detection device 2. For example, “only the trigger response pneumatic signal” indicated by hatching indicates a restriction mode in which transmission of a predetermined signal is restricted and a pneumatic signal is transmitted only when there is a request from the vehicle-mounted device 1. A white portion indicates an unrestricted mode in which transmission of a predetermined signal is not restricted.
  • “Wireless signal for locking / unlocking (portable device)” is a response signal transmitted from the portable device 9 in the process of wireless communication with the in-vehicle device 1 such as locking / unlocking of the vehicle door, confirmation of the presence / absence of the portable device 9 while traveling It is shown that.
  • the “key operation radio signal (portable device)” indicates that a signal is transmitted from the portable device 9 by a locking / unlocking operation of the vehicle door using the portable device 9.
  • the detection device 2 when the ignition switch 6 is switched from the off state to the on state, the detection device 2 is switched to the unrestricted mode.
  • the detection device 2 When a predetermined time has elapsed since the ignition switch 6 was switched on, the detection device 2 is switched to the restriction mode, and when the vehicle C starts traveling, the detection device 2 is switched to the non-restriction mode again. Finally, when the vehicle C stops and the ignition switch 6 is turned off, the detection device 2 is switched to the restriction mode again.
  • wireless communication with the portable device 9 is important, such as operating the detection device 2 in an unrestricted mode and locking and unlocking the vehicle door. In such a situation, interference between the signal transmitted from the portable device 9 and the signal transmitted from the detection device 2 can be suppressed by setting the detection device 2 in the restriction mode.
  • the vehicle-mounted control unit 11 of the vehicle-mounted device 1 monitors the operation state of the ignition switch 6 and determines whether or not the ignition switch 6 has changed from the off state to the on state (step S11). When it determines with the ignition switch 6 being an OFF state (step S11: NO), the vehicle-mounted control part 11 returns a process to step S11, and waits.
  • step S11 When it is determined that the ignition switch 6 has changed from the off state to the on state (step S11: YES), the in-vehicle control unit 11 transmits a switching signal instructing switching to the non-restricted mode, that is, a release signal to the in-vehicle transmission unit 14. (Step S12).
  • the detection apparatus 2 that has received the release signal shifts from the restricted mode to the non-restricted mode.
  • vehicle-mounted control part 11 detects and monitors the air pressure of each tire 3 by performing radio
  • step S14 determines whether or not a predetermined time has elapsed after instructing the switching to the non-restricted mode.
  • step S14 determines whether or not a predetermined time has elapsed after instructing the switching to the non-restricted mode.
  • the vehicle-mounted control unit 11 determines whether or not the detection device 2 is currently in the non-restricted mode (step S15). When it determines with it being in non-restriction mode (step S15: YES), the vehicle-mounted control part 11 transmits the switching signal which instruct
  • step S16 When the process of step S16 is completed, when it is determined that it is not the non-restricted mode (step S15: NO), the in-vehicle control unit 11 acquires a signal from the vehicle speed sensor 5 and determines whether or not the vehicle C is traveling. Is determined (step S17). When it determines with the vehicle C not driving
  • the in-vehicle control unit 11 causes the in-vehicle transmission unit 14 to transmit a switching signal for instructing switching to the non-restricted mode (step S18). ).
  • the detection apparatus 2 that has received the release signal shifts to the non-restricted mode.
  • the vehicle-mounted control part 11 detects and monitors the air pressure of each tire 3 by performing radio
  • the vehicle-mounted control unit 11 determines whether or not the ignition switch 6 has changed from the on state to the off state (step S20). When it determines with the ignition switch 6 being an ON state (step S20: NO), the vehicle-mounted control part 11 returns a process to step S19, and continues monitoring of a tire air pressure.
  • the in-vehicle control unit 11 causes the in-vehicle transmission unit 14 to transmit a switching signal that instructs switching to the restriction mode, that is, the restriction signal. (Step S21), the process ends.
  • the detection device 2 is in the non-restricted mode for a predetermined time, and air pressure monitoring has priority. That is, the in-vehicle device 1 can monitor the air filling of the tire 3 and the rapid increase / decrease state of the tire air pressure.
  • the predetermined time When the predetermined time has elapsed, the importance of air pressure monitoring decreases, so that the detection device 2 enters the restriction mode, and transmission of the predetermined signal from the portable device 9 is suppressed. In this state, interference between the signal transmitted from the detection device 2 and the signal transmitted from the portable device 9 is suppressed.
  • the detection device 2 is switched to the non-restricted mode, and it becomes possible to monitor a rapid increase / decrease in tire pressure.
  • the importance of wireless communication with the portable device 9 is higher than the monitoring of the air pressure, so that the detection device 2 is in the non-restricted mode and transmitted from the detection device 2 Interference between the transmitted signal and the signal transmitted from the portable device 9 is suppressed.
  • the detection device 2 shifts to the non-restricted mode when the ignition switch 6 is switched from the off state to the on state.
  • the vehicle-mounted device 1 may be configured to transmit a release signal.
  • the in-vehicle device 1 stores a specific position where the tire 3 may be filled with air, such as a gas station or a home.
  • the in-vehicle device 1 transmits a release signal to the detection device 2 by the in-vehicle transmission unit 14 and the position of the vehicle C is not the specific position.
  • the release signal is not transmitted, and the detection device 2 is left in the restriction mode.
  • the detection device 2 is operated in the restriction mode. By doing so, interference between the signal transmitted from the detection device 2 and the signal transmitted from the portable device 9 can be effectively suppressed.
  • In-vehicle device (monitoring device) 2 Detection Device 3 Tire 4 Notification Device 5 Vehicle Speed Sensor 6 Ignition Switch 7 Positioning Device 8 Door ECU DESCRIPTION OF SYMBOLS 9 Portable machine 11 Car-mounted control part 12 Memory

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Tires In General (AREA)

Abstract

The present invention is provided with: a transmission unit for continuously transmitting a predetermined signal to a detection device when the increase/decrease rate of tire air pressure is equal to or greater than a threshold value, wherein the detection device detects the air pressure of a tire provided in a vehicle and transmits an air pressure signal including information on the detected air pressure, when a request signal is received; a reception unit for receiving a restriction signal that instructs the restriction of transmission of the predetermined signal; and a control unit for restricting the transmission, by the transmission unit, of the predetermined signal when the reception unit receives the restriction signal

Description

検出装置及びタイヤ空気圧監視システムDetection device and tire pressure monitoring system
　本発明は、検出装置及びタイヤ空気圧監視システムに関する。
　本出願は、２０１７年５月１２日出願の日本出願第２０１７－９５７９９号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。 The present invention relates to a detection device and a tire pressure monitoring system.
This application claims priority based on Japanese Patent Application No. 2017-95799 filed on May 12, 2017, and incorporates all the description content described in the above Japanese application.
　車両に設けられたタイヤの空気圧を検出し、検出した空気圧に異常があった場合、使用者に警告等を発するタイヤ空気圧監視システム（ＴＰＭＳ：Tire Pressure Monitoring System）がある。タイヤ空気圧監視システムは、タイヤの空気圧を検出し、検出して得た空気圧の情報を含む空気圧信号をＵＨＦ帯の電波を用いて無線送信する検出装置と、当該検出装置から無線送信された空気圧信号を受信し、受信した空気圧信号に基づいてタイヤの空気圧を監視する監視装置とを備える。 There is a tire pressure monitoring system (TPMS: Tire Pressure 空 気 圧 Monitoring System) that detects the air pressure of the tires installed in the vehicle and issues a warning to the user if the detected air pressure is abnormal. A tire air pressure monitoring system detects a tire air pressure, wirelessly transmits a pneumatic signal including information on the air pressure obtained by the detection using a radio wave in the UHF band, and a pneumatic signal wirelessly transmitted from the detection device And a monitoring device that monitors the tire air pressure based on the received air pressure signal.
　監視装置は、車体に設けられており、各検出装置のセンサ識別子を、車両にタイヤが設けられる４つのタイヤ位置に関連付けてメモリに記憶している。また、監視装置には、各タイヤの近傍にそれぞれ配された４本のＬＦ送信アンテナが接続されている。監視装置は、各タイヤ位置に対応するＬＦ送信アンテナから、対応するセンサ識別子を含む要求信号をＬＦ（Low Frequency）帯の電波を用いて、各タイヤ位置へ送信する。各ＬＦ送信アンテナの通信範囲は、基本的に対応するタイヤ位置の範囲に限定されているため、監視装置は、各タイヤに設けられた検出装置へ各別に要求信号を送信することができる。 The monitoring device is provided in the vehicle body, and the sensor identifier of each detection device is stored in the memory in association with the four tire positions where the tire is provided in the vehicle. The monitoring device is connected to four LF transmitting antennas arranged in the vicinity of each tire. The monitoring device transmits a request signal including a corresponding sensor identifier from each LF transmission antenna corresponding to each tire position to each tire position using a radio wave in an LF (Low Frequency) band. Since the communication range of each LF transmission antenna is basically limited to the range of the corresponding tire position, the monitoring device can transmit a request signal to each detection device provided in each tire.
　検出装置は、右前、左前、右後及び左後の各タイヤにそれぞれ設けられており、受信した要求信号に含まれるセンサ識別子が、自装置のセンサ識別子と一致する場合、検出して得られた空気圧を含む空気圧信号を無線送信する。監視装置は、各検出装置から送信された空気圧信号を受信し、各タイヤの空気圧を監視する。 The detection device is provided in each of the right front, left front, right rear, and left rear tires, and when the sensor identifier included in the received request signal matches the sensor identifier of the own device, the detection device is obtained. Air pressure signals including air pressure are transmitted wirelessly. The monitoring device receives the air pressure signal transmitted from each detection device, and monitors the air pressure of each tire.
　また、タイヤに空気圧が充填された際に所定信号を継続的に送信し、タイヤに空気圧が充填されたことを監視装置へ通知するＴＦＡ（Tire Fill Assist）機能がある。また、タイヤの空気圧が急激に減少した際に他の所定信号を送信し、タイヤ空気圧の減少を監視装置へ通知する機能がある。 Also, there is a TFA (Tire Fill Assist) function that continuously transmits a predetermined signal when the tire is filled with air pressure and notifies the monitoring device that the tire is filled with air pressure. Further, there is a function of transmitting another predetermined signal when the tire air pressure rapidly decreases and notifying the monitoring device of the decrease in the tire air pressure.
　一方、特許文献１には、タイヤ空気圧の監視機能を有するキーレスエントリ装置が開示されている。当該キーレスエントリ装置は、車両のイグニッションスイッチがオン状態になったときにタイヤ空気圧監視モードにして受信部を連続動作に設定し、イグニッションスイッチがオフ状態になったときにキーレスエントリモードにして受信部を間欠動作に設定する。 On the other hand, Patent Document 1 discloses a keyless entry device having a tire air pressure monitoring function. The keyless entry device sets the receiving unit to the tire pressure monitoring mode when the vehicle ignition switch is turned on, sets the receiving unit to continuous operation, and sets the receiving unit to the keyless entry mode when the ignition switch is turned off. Is set to intermittent operation.
特開２００３－８１０５９号公報JP 2003-81059 A
　本態様に係る検出装置は、要求信号を受信した場合、車両に設けられたタイヤの空気圧を検出し、検出して得た空気圧の情報を含む空気圧信号を送信する検出装置であって、タイヤの空気圧の増減速度が閾値以上である場合、該空気圧に応じて所定信号を継続的に送信する送信部と、前記所定信号の送信の制限を指示する制限信号を受信する受信部と、該受信部にて前記制限信号を受信した場合、前記送信部による前記所定信号の送信を制限させる制御部とを備える。 The detection device according to the present aspect is a detection device that detects the air pressure of a tire provided in a vehicle when a request signal is received, and transmits a pneumatic signal including information on the air pressure obtained by the detection. When the increase / decrease speed of the air pressure is equal to or greater than a threshold value, a transmitting unit that continuously transmits a predetermined signal in accordance with the air pressure, a receiving unit that receives a limiting signal instructing limiting transmission of the predetermined signal, and the receiving unit And a control unit that restricts transmission of the predetermined signal by the transmitting unit when the limiting signal is received.
本発明の実施形態に係る車両用通信システムの一構成例を示す概念図である。It is a conceptual diagram which shows one structural example of the communication system for vehicles which concerns on embodiment of this invention. 本発明の実施形態に係る車載機の一構成例を示すブロック図である。It is a block diagram which shows the example of 1 structure of the vehicle equipment which concerns on embodiment of this invention. 本発明の実施形態に係る検出装置の一構成例を示すブロック図である。It is a block diagram which shows the example of 1 structure of the detection apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る携帯機の一構成例を示すブロック図である。It is a block diagram which shows the example of 1 structure of the portable device which concerns on embodiment of this invention. 検出装置の動作モードの切り替えに係る処理手順を示すフローチャートである。It is a flowchart which shows the process sequence which concerns on switching of the operation mode of a detection apparatus. 検出装置の動作モードの切り替えに係る処理手順を示すフローチャートである。It is a flowchart which shows the process sequence which concerns on switching of the operation mode of a detection apparatus. 検出装置の動作モードの切り替え方法を示すタイミングチャートである。It is a timing chart which shows the switching method of the operation mode of a detection apparatus.
［本開示が解決しようとする課題］
　携帯機との間で無線通信を行い車両の施解錠等を行う車両用通信システムで用いられる無線の周波数帯は、タイヤ空気圧監視システムの検出装置から無線送信される信号の周波数帯と共通であるため、電波競合が発生し、各システムが正常に作動しなくなるおそれがあった。
　特にタイヤ空気圧が増減した際、検出装置から所定信号が自発的に送信されるため、検出装置から送信される信号と、携帯機から送信される信号とが混信する可能性が高くなる。 [Problems to be solved by the present disclosure]
The wireless frequency band used in the vehicle communication system that performs wireless communication with the portable device to lock and unlock the vehicle, etc. is the same as the frequency band of the signal wirelessly transmitted from the detection device of the tire pressure monitoring system. For this reason, radio wave competition may occur, and each system may not operate normally.
In particular, when the tire air pressure increases or decreases, a predetermined signal is spontaneously transmitted from the detection device, so that there is a high possibility that a signal transmitted from the detection device and a signal transmitted from the portable device will interfere with each other.
　本開示の目的は、車両の施解錠等制御に用いられる携帯機から送信される信号と、タイヤ空気圧の監視に用いられる検出装置から送信される信号との混信を抑制することができる検出装置及びタイヤ空気圧監視システムを提供することにある。 An object of the present disclosure is to provide a detection device capable of suppressing interference between a signal transmitted from a portable device used for vehicle locking / unlocking control and the like and a signal transmitted from a detection device used for monitoring tire pressure. It is to provide a tire pressure monitoring system.
［本開示の効果］
　本開示によれば、車両の施解錠等制御に用いられる携帯機から送信される信号と、タイヤ空気圧の監視に用いられる検出装置から送信される信号との混信を抑制することができる検出装置及びタイヤ空気圧監視システムを提供することが可能となる。 [Effects of the present disclosure]
According to the present disclosure, a detection device capable of suppressing interference between a signal transmitted from a portable device used for control of locking and unlocking of a vehicle and a signal transmitted from a detection device used for monitoring tire pressure, and It is possible to provide a tire pressure monitoring system.
［本願発明の実施形態の説明］
　最初に本発明の実施態様を列記して説明する。また、以下に記載する実施形態の少なくとも一部を任意に組み合わせてもよい。 [Description of Embodiment of Present Invention]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.
（１）本態様に係る検出装置は、要求信号を受信した場合、車両に設けられたタイヤの空気圧を検出し、検出して得た空気圧の情報を含む空気圧信号を送信する検出装置であって、タイヤの空気圧の増減速度が閾値以上である場合、該空気圧に応じて所定信号を継続的に送信する送信部と、前記所定信号の送信の制限を指示する制限信号を受信する受信部と、該受信部にて前記制限信号を受信した場合、前記送信部による前記所定信号の送信を制限させる制御部とを備える。 (1) A detection device according to this aspect is a detection device that detects the air pressure of a tire provided in a vehicle when a request signal is received, and transmits an air pressure signal including information on the air pressure obtained by the detection. When the increase / decrease speed of the tire air pressure is equal to or higher than the threshold value, a transmitting unit that continuously transmits a predetermined signal according to the air pressure, and a receiving unit that receives a limiting signal instructing limitation of transmission of the predetermined signal; A control unit configured to limit transmission of the predetermined signal by the transmission unit when the reception unit receives the restriction signal.
　本態様によれば、検出装置は、外部から送信される要求信号を受信した場合、空気圧信号を送信する。また、タイヤの空気圧が閾値以上の速度で増減した場合、当該空気圧に応じて所定信号を継続的に送信する。例えば、タイヤに空気が充填された場合、検出装置は所定信号を継続的に送信する。また、パンク等によりタイヤの空気圧が急速に減少している場合、検出装置は所定信号を継続的に送信する。
　しかし、検出装置は、外部から送信される制限信号を受信した場合、上記所定信号の送信を制限し、所定信号の継続的送信を抑制する。従って、検出装置の動作モードを制御することによって、外部の通信機器から送信される信号と、検出装置から送信される信号との混信を抑制することが可能になる。
　外部の通信機器は、例えば車両ドアの施解錠を行うために車両との間で無線通信を行う携帯機である。 According to this aspect, when the detection device receives a request signal transmitted from the outside, the detection device transmits an air pressure signal. Further, when the tire air pressure increases or decreases at a speed equal to or higher than the threshold, a predetermined signal is continuously transmitted according to the air pressure. For example, when the tire is filled with air, the detection device continuously transmits a predetermined signal. Further, when the tire air pressure rapidly decreases due to puncture or the like, the detection device continuously transmits a predetermined signal.
However, when receiving a restriction signal transmitted from the outside, the detection device restricts transmission of the predetermined signal and suppresses continuous transmission of the predetermined signal. Therefore, by controlling the operation mode of the detection device, it is possible to suppress interference between the signal transmitted from the external communication device and the signal transmitted from the detection device.
The external communication device is, for example, a portable device that performs wireless communication with a vehicle in order to lock and unlock the vehicle door.
（２）前記制御部は、前記受信部にて前記制限の解除を指示する解除信号を受信した場合、前記送信部による前記所定信号の制限を解除する構成が好ましい。 (2) Preferably, the control unit cancels the restriction of the predetermined signal by the transmission unit when the reception unit receives a release signal instructing the release of the restriction.
　本態様によれば、所定信号の送信を制限している場合において、外部から送信された解除信号を受信したとき、検出装置は、上記制限を解除する。従って、外部の通信機器から送信される信号と、検出装置から送信される信号との混信が問題とならない状況においては、検出装置に解除信号を送信することによって、タイヤの空気充填、空気圧異常の監視を再開させることができる。 According to this aspect, when the transmission of the predetermined signal is restricted, the detection device removes the restriction when receiving the release signal transmitted from the outside. Therefore, in a situation where interference between the signal transmitted from the external communication device and the signal transmitted from the detection device does not cause a problem, the release signal is transmitted to the detection device, so that the tire can be filled with air or abnormal in air pressure. Monitoring can be resumed.
（３）本態様に係るタイヤ空気圧監視システムは、前記車両の複数のタイヤにそれぞれ設けられた態様（１）又は態様（２）の検出装置と、前記検出装置との間で無線通信を行い、各タイヤの空気圧を監視する監視装置とを備える。 (3) The tire pressure monitoring system according to this aspect performs wireless communication between the detection device of the aspect (1) or the aspect (2) provided in each of the plurality of tires of the vehicle and the detection device, And a monitoring device for monitoring the air pressure of each tire.
　本態様によれば、タイヤ空気圧監視システムにおいて、態様（１）同様、監視装置は検出装置に制御信号を送信することによって、外部の通信機器から送信される信号と、検出装置から送信される信号との混信を抑制することが可能になる。 According to this aspect, in the tire pressure monitoring system, as in the aspect (1), the monitoring device transmits a control signal to the detection device, thereby transmitting a signal transmitted from an external communication device and a signal transmitted from the detection device. It becomes possible to suppress interference with.
（４）前記監視装置は、前記車両のイグニッションスイッチがオフ状態からオン状態に切り替えられてから所定時間が経過した場合、前記制限信号を送信する構成が好ましい。 (4) Preferably, the monitoring device transmits the limit signal when a predetermined time has elapsed after the ignition switch of the vehicle is switched from the off state to the on state.
　本態様によれば、イグニッションスイッチがオフ状態からオン状態に切り替えられてから所定時間が経過した場合、空気圧の充填に係る通知が不要になっている可能性が高いため、検出装置による所定信号の継続的な送信を制限し、混信を抑制する。 According to this aspect, when the predetermined time has elapsed since the ignition switch was switched from the off state to the on state, there is a high possibility that the notification relating to the filling of the air pressure is unnecessary. Limit continuous transmission and suppress interference.
（５）前記監視装置は、前記車両が走行を開始した場合、前記制限の解除を指示する解除信号を送信する構成が好ましい。 (5) When the said vehicle starts driving | running | working, the structure with which the said monitoring apparatus transmits the cancellation | release signal which instruct | indicates cancellation | release of the said limitation is preferable.
　本態様によれば、車両走行中は、上記制限が解除されるため、タイヤ空気圧の急激な減少を監視することができる。
　一方、車両走行中においては、車両ドアの施解錠が行われることは無く，車両ドアの施解錠を行う携帯機から送信される信号と、検出装置から送信される信号との混信は大きな問題にならない。 According to this aspect, since the restriction is released while the vehicle is traveling, it is possible to monitor a rapid decrease in tire air pressure.
On the other hand, when the vehicle is running, the vehicle door is not locked and unlocked, and the interference between the signal transmitted from the portable device that locks and unlocks the vehicle door and the signal transmitted from the detection device is a major problem. Don't be.
（６）前記監視装置は、前記車両のイグニッションスイッチがオン状態からオフ状態に切り替えられた場合、前記制限信号を送信する構成が好ましい。 (6) Preferably, the monitoring device transmits the limit signal when an ignition switch of the vehicle is switched from an on state to an off state.
　本態様によれば、イグニッションスイッチがオン状態からオフ状態に切り替えられた場合、タイヤ空気圧の監視に比べ、車両ドアの施解錠に係る無線通信が重要になる可能性が高いため、検出装置による所定信号の継続的な送信を制限し、車両ドアの施解錠を行うための携帯機から送信される信号と、検出装置から送信される信号との混信を抑止する。 According to this aspect, when the ignition switch is switched from the on-state to the off-state, wireless communication related to locking / unlocking of the vehicle door is more likely to be important than monitoring of the tire air pressure. The continuous transmission of the signal is restricted, and interference between the signal transmitted from the portable device for locking and unlocking the vehicle door and the signal transmitted from the detection device is suppressed.
（７）前記監視装置は、前記車両のイグニッションスイッチがオフ状態からオン状態に切り替えられた場合、前記制限の解除を指示する解除信号を送信する構成が好ましい。 (7) Preferably, the monitoring device transmits a release signal instructing release of the restriction when an ignition switch of the vehicle is switched from an off state to an on state.
　本態様によれば、イグニッションスイッチがオフ状態からオン状態に切り替えられた場合、走行前におけるタイヤ空気圧の監視に係る無線通信が、車両ドアの施解錠に係る無線通信に比べて重要になる可能性が高いため、上記制限を解除する。従って、イグニッションオン切替時においては、タイヤの空気充填、タイヤ空気圧の急激な増減を監視することができる。 According to this aspect, when the ignition switch is switched from the off state to the on state, wireless communication related to monitoring the tire air pressure before traveling may be more important than wireless communication related to locking and unlocking of the vehicle door. Because the price is high, the above restriction is lifted. Therefore, at the time of switching on the ignition, it is possible to monitor tire air filling and rapid increase / decrease in tire air pressure.
（８）前記車両は、携帯機と無線通信を行うことによって前記車両の施解錠を行う機能を有しており、前記検出装置及び前記携帯機は、重複する周波数帯の電波を用いて信号を送信する構成が好ましい。 (8) The vehicle has a function of locking and unlocking the vehicle by performing wireless communication with a portable device, and the detection device and the portable device transmit signals using radio waves in overlapping frequency bands. A configuration for transmission is preferable.
　本態様によれば、車両の施解錠を行うための携帯機から送信される信号と、タイヤの空気圧を監視するための検出装置から送信される信号との混信を抑制することができる。 According to this aspect, it is possible to suppress interference between a signal transmitted from a portable device for locking and unlocking a vehicle and a signal transmitted from a detection device for monitoring tire air pressure.
［本発明の実施形態の詳細］
　本発明の実施形態に係る車両用通信システムの具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 [Details of the embodiment of the present invention]
A specific example of a vehicle communication system according to an embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.
　図１は、本発明の実施形態に係る車両用通信システムの一構成例を示す概念図である。本実施形態に係る車両用通信システムは、タイヤ空気圧監視システムとして機能し、車体の適宜箇所に設けられた車載機（監視装置）１と、車両Ｃに設けられた複数のタイヤ３のホイールそれぞれに設けられた複数の検出装置２と、報知装置４とを備える。検出装置２は、自装置が設けられたタイヤ３の空気圧を検出する。本実施形態の車両用通信システムでは、車載機１が各検出装置２と無線通信を行うことにより、各タイヤ３の空気圧に係る情報を取得し、報知装置４を用いて各タイヤ３の空気圧を報知する。
　一方、車両用通信システムは、車載機１との間で信号を送受信する携帯機９を備え、車載機１は、携帯機９と無線信号を行うことによって、当該携帯機９の位置を検出する。車載機１は、携帯機９と共に、ドアの施解錠を制御するスマートエントリ（登録商標）システム等を構成している。 FIG. 1 is a conceptual diagram showing a configuration example of a vehicle communication system according to an embodiment of the present invention. The vehicle communication system according to the present embodiment functions as a tire air pressure monitoring system, and is applied to each of the vehicle-mounted device (monitoring device) 1 provided at an appropriate location of the vehicle body and the wheels of the plurality of tires 3 provided in the vehicle C. A plurality of detection devices 2 provided and a notification device 4 are provided. The detection device 2 detects the air pressure of the tire 3 provided with the device itself. In the vehicular communication system of the present embodiment, the vehicle-mounted device 1 wirelessly communicates with each detection device 2 to acquire information related to the air pressure of each tire 3, and the air pressure of each tire 3 is obtained using the notification device 4. Inform.
On the other hand, the vehicle communication system includes a portable device 9 that transmits and receives signals to and from the in-vehicle device 1, and the in-vehicle device 1 detects the position of the portable device 9 by performing a radio signal with the portable device 9. . The in-vehicle device 1 and the portable device 9 constitute a smart entry (registered trademark) system that controls the locking and unlocking of the door.
　車載機１には、各タイヤ３に対応する複数のＬＦ送信アンテナ１４ａが接続されている。例えば、４本のＬＦ送信アンテナ１４ａは車両Ｃの右前、右後、左後及び左前のタイヤ位置に設けられている。タイヤ位置は、タイヤハウス及びその周辺の位置であり、各ＬＦ送信アンテナ１４ａからそれぞれ送信される信号を、各タイヤ３に設けられた検出装置２が各別に受信できる位置である。図１中、一点鎖線は、各ＬＦ送信アンテナ１４ａから送信される要求信号を検出装置２が受信可能な範囲を示している。
　また、車載機１には、携帯機９の位置を検出するための複数のＬＦ送信アンテナ１４ｂが接続されている。例えば、ＬＦ送信アンテナ１４ｂは、車両ドア近傍及び車内に設けられている。
　本実施形態に係るＬＦ送信アンテナ１４ａは、携帯機９の位置を検出するための位置検出用信号を、当該携帯機９へ送信するアンテナとしても機能し、車載機１は、ＬＦ送信アンテナ１４ａ及び１４ｂを用いて携帯機９と無線通信を行い、携帯機９の位置を検出する。 A plurality of LF transmission antennas 14 a corresponding to the respective tires 3 are connected to the in-vehicle device 1. For example, the four LF transmitting antennas 14a are provided at the right front, right rear, left rear, and left front tire positions of the vehicle C. The tire position is a position around the tire house and its surroundings, and is a position where the detection device 2 provided in each tire 3 can individually receive a signal transmitted from each LF transmission antenna 14a. In FIG. 1, an alternate long and short dash line indicates a range in which the detection apparatus 2 can receive a request signal transmitted from each LF transmission antenna 14a.
The in-vehicle device 1 is connected to a plurality of LF transmission antennas 14b for detecting the position of the portable device 9. For example, the LF transmission antenna 14b is provided in the vicinity of the vehicle door and in the vehicle.
The LF transmission antenna 14a according to the present embodiment also functions as an antenna that transmits a position detection signal for detecting the position of the portable device 9 to the portable device 9, and the in-vehicle device 1 includes the LF transmission antenna 14a and the LF transmission antenna 14a. Wireless communication is performed with the portable device 9 using 14b, and the position of the portable device 9 is detected.
　車載機１が検出装置２との間で行う無線通信の方式には、単方向通信方法と、双方向通信方法とがある。例えば、車載機１は、車両Ｃが停止している場合、主に双方向通信によって、空気圧信号を受信し、車両Ｃが走行している場合、主に単方向通信によって空気圧信号を受信する。
　単方向通信方式において、検出装置２は、所定のタイミングで空気圧信号を自発的に送信する。車載機１は、後述するように、タイヤ３が設けられる各タイヤ位置と、該タイヤ位置のタイヤ３に設けられた検出装置２のセンサ識別子との関係を記憶している。車載機１は、各タイヤ位置と、該タイヤ位置のタイヤ３に設けられた検出装置２のセンサ識別子との関係を記憶しているため、空気圧信号に含まれるセンサ識別子を用いて、各タイヤ３の空気圧を認識することができる。また、検出装置２は、タイヤ空気圧の増減速度が閾値以上である場合、当該タイヤ空気圧に応じて所定信号を継続的に送信する。検出装置２は、タイヤ３の空気圧が急激に増減した場合、例えばタイヤ３に空気が充填された場合、所定信号を継続的に送信する。また、携帯機９は、タイヤ空気圧が急激に減少した場合、他の所定信号を送信する。
　双方向通信方式において、車載機１は、タイヤ３の空気圧信号を要求する要求信号を、各ＬＦ送信アンテナ１４ａからＬＦ（Low Frequency）帯の電波により各検出装置２それぞれへ各別に送信する。要求信号には、送信先であるタイヤ位置のタイヤ３に設けられた検出装置２のセンサ識別子が含まれている。検出装置２は、自装置のセンサ識別子と同一のセンサ識別子を含む要求信号を受信した場合、タイヤ３の空気圧を検出し、検出して得た空気圧及び自装置のセンサ識別子を含む空気圧信号をＵＨＦ（Ultra High Frequency）帯の電波により車載機１へ送信する。車載機１は、ＲＦ受信アンテナ１３ａを備え、各検出装置２から送信された空気圧信号をＲＦ受信アンテナ１３ａにて受信し、該空気圧信号から各タイヤ３の空気圧の情報を取得する。 There are a unidirectional communication method and a bidirectional communication method as a method of wireless communication performed by the in-vehicle device 1 with the detection device 2. For example, when the vehicle C is stopped, the vehicle-mounted device 1 receives the air pressure signal mainly by bidirectional communication, and receives the air pressure signal mainly by unidirectional communication when the vehicle C is traveling.
In the unidirectional communication method, the detection device 2 spontaneously transmits an air pressure signal at a predetermined timing. As will be described later, the vehicle-mounted device 1 stores a relationship between each tire position where the tire 3 is provided and a sensor identifier of the detection device 2 provided on the tire 3 at the tire position. Since the vehicle-mounted device 1 stores the relationship between each tire position and the sensor identifier of the detection device 2 provided in the tire 3 at the tire position, each tire 3 is used by using the sensor identifier included in the air pressure signal. The air pressure can be recognized. Moreover, when the increase / decrease speed of the tire pressure is equal to or greater than the threshold value, the detection device 2 continuously transmits a predetermined signal according to the tire pressure. The detection device 2 continuously transmits a predetermined signal when the air pressure of the tire 3 suddenly increases or decreases, for example, when the tire 3 is filled with air. Moreover, the portable device 9 transmits another predetermined signal when the tire air pressure decreases rapidly.
In the two-way communication method, the vehicle-mounted device 1 transmits a request signal for requesting the air pressure signal of the tire 3 to each detection device 2 from each LF transmission antenna 14a to each detection device 2 by radio waves in the LF (Low Frequency) band. The request signal includes the sensor identifier of the detection device 2 provided in the tire 3 at the tire position that is the transmission destination. When the detection device 2 receives a request signal including the same sensor identifier as the sensor identifier of its own device, the detection device 2 detects the air pressure of the tire 3, and detects the air pressure obtained by the detection and the air pressure signal including the sensor identifier of the own device as UHF. It transmits to the vehicle-mounted device 1 by radio waves in the (Ultra High Frequency) band. The in-vehicle device 1 includes an RF receiving antenna 13a, receives the air pressure signal transmitted from each detection device 2 by the RF receiving antenna 13a, and acquires information on the air pressure of each tire 3 from the air pressure signal.
　なおＬＦ帯及びＵＨＦ帯は無線通信を行う際に用いる電波帯域の一例であり、必ずしもこれに限定されない。 Note that the LF band and the UHF band are examples of a radio wave band used when performing wireless communication, and are not necessarily limited thereto.
　更に、車載機１には通信線を介して報知装置４が接続されており、車載機１は取得した空気圧に係る情報を報知装置４へ送信する。報知装置４は車載機１から送信された情報を受信し、各タイヤ３の空気圧を報知する。また、車載機１は、タイヤ３の空気圧が所定の閾値未満である場合、報知装置４にて警告を発する。更に、報知装置４は、タイヤ３の空気充填、タイヤ空気圧の急激な減少等の情報を通知する。 Furthermore, the notification device 4 is connected to the in-vehicle device 1 via a communication line, and the in-vehicle device 1 transmits information related to the acquired air pressure to the notification device 4. The notification device 4 receives the information transmitted from the in-vehicle device 1 and notifies the air pressure of each tire 3. Moreover, the vehicle equipment 1 issues a warning by the notification device 4 when the air pressure of the tire 3 is less than a predetermined threshold value. Further, the notification device 4 notifies information such as air filling of the tire 3 and a rapid decrease in tire air pressure.
　図２は、本発明の実施形態に係る車載機１の一構成例を示すブロック図である。車載機１は、自装置の各構成部の動作を制御する車載制御部１１を備える。車載制御部１１には、記憶部１２、車載受信部１３、車載送信部１４、入出力部１５が接続されている。 FIG. 2 is a block diagram showing a configuration example of the in-vehicle device 1 according to the embodiment of the present invention. The in-vehicle device 1 includes an in-vehicle control unit 11 that controls the operation of each component of the own device. A storage unit 12, an in-vehicle receiving unit 13, an in-vehicle transmitting unit 14, and an input / output unit 15 are connected to the in-vehicle control unit 11.
　車載制御部１１は、例えば一又は複数のＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）、入出力インタフェース等を有するマイコンである。車載制御部１１のＣＰＵは入出力インタフェースを介して記憶部１２、車載受信部１３、車載送信部１４、入出力部１５に接続している。車載制御部１１は記憶部１２に記憶されている制御プログラムを実行することにより、各構成部の動作を制御し、本実施形態に係るタイヤ空気圧監視処理、車両ドアの施解錠処理等を実行する。 The in-vehicle control unit 11 is a microcomputer having, for example, one or a plurality of CPUs (Central Processing Units), a multi-core CPU, a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, and the like. The CPU of the in-vehicle control unit 11 is connected to the storage unit 12, the in-vehicle reception unit 13, the in-vehicle transmission unit 14, and the input / output unit 15 through an input / output interface. The in-vehicle controller 11 controls the operation of each component by executing a control program stored in the storage unit 12, and executes a tire pressure monitoring process, a vehicle door locking / unlocking process, and the like according to the present embodiment. .
　記憶部１２は、ＥＥＰＲＯＭ（Electrically Erasable Programmable ROM）、フラッシュメモリ等の不揮発性メモリである。記憶部１２は、車載制御部１１が車載機１の各構成部の動作を制御することにより、タイヤ空気圧監視処理及び施解錠処理を実行するための制御プログラムを記憶している。また、記憶部１２は、識別子テーブルを記憶している。識別子テーブルは、複数のタイヤ位置と、当該タイヤ位置近傍に配されたＬＦ送信アンテナ１４ａを識別するためのアンテナ識別子と、当該タイヤ位置のタイヤ３に設けられた検出装置２のセンサ識別子とを対応付けて記憶している。 The storage unit 12 is a nonvolatile memory such as an EEPROM (ElectricallyrErasable Programmable ROM) or a flash memory. The memory | storage part 12 has memorize | stored the control program for performing a tire pressure monitoring process and a locking / unlocking process, when the vehicle-mounted control part 11 controls operation | movement of each structure part of the vehicle equipment 1. FIG. The storage unit 12 stores an identifier table. The identifier table corresponds to a plurality of tire positions, an antenna identifier for identifying the LF transmission antenna 14a disposed in the vicinity of the tire position, and a sensor identifier of the detection device 2 provided in the tire 3 at the tire position. I remember it.
　車載受信部１３には、ＲＦ受信アンテナ１３ａが接続されている。車載受信部１３は、検出装置２又は携帯機９からＲＦ帯の電波を用いて送信された信号を、ＲＦ受信アンテナ１３ａにて受信する。車載受信部１３は、受信した信号を復調し、復調された信号を車載制御部１１へ出力する回路である。例えば、車載受信部１３は、検出装置２から送信される空気圧信号を受信する。また、車載受信部１３は、携帯機９の位置検出を行う際に、携帯機９から送信される応答信号等を受信する。応答信号には携帯機９の位置を検出するための情報が含まれている。
　なお、搬送波としては３００ＭＨｚ～３ＧＨｚのＵＨＦ帯を使用するが、この周波数帯に限定するものでは無い。 An RF receiving antenna 13 a is connected to the in-vehicle receiving unit 13. The in-vehicle receiving unit 13 receives a signal transmitted from the detection device 2 or the portable device 9 using radio waves in the RF band by the RF receiving antenna 13a. The in-vehicle receiver 13 is a circuit that demodulates the received signal and outputs the demodulated signal to the in-vehicle controller 11. For example, the in-vehicle receiving unit 13 receives an air pressure signal transmitted from the detection device 2. The in-vehicle receiving unit 13 receives a response signal transmitted from the portable device 9 when detecting the position of the portable device 9. The response signal includes information for detecting the position of the portable device 9.
Note that a UHF band of 300 MHz to 3 GHz is used as a carrier wave, but the carrier wave is not limited to this frequency band.
　車載送信部１４は、車載制御部１１から出力された信号をＬＦ帯の信号に変調し、変調された信号を複数のＬＦ送信アンテナ１４ａ、１４ｂからそれぞれ各別に検出装置２へ送信する回路である。搬送波としては３０ｋＨｚ～３００ｋＨｚのＬＦ帯を使用するが、この周波数帯に限定するものでは無い。
　車載送信部１４は、例えば、任意のタイミングでタイヤ３の空気圧を検出する際、空気圧情報を要求する要求信号をＬＦ送信アンテナ１４ａから各検出装置２へ送信する。また、車載送信部１４は、所要のタイミングで、検出装置２の動作モードを切り替えるための信号、即ち検出装置２の動作を制限する制限信号、当該制限を解除する解除信号をＬＦ送信アンテナ１４ａから送信する。制限信号は、具体的には、タイヤ３の空気充填時、タイヤ３のパンク時等に、検出装置２がＵＨＦ帯の電波を用いて継続的に所定信号を送信する動作を制限するものである。更に、車載送信部１４は、携帯機９の位置検出を行う場合、ＬＦ送信アンテナ１４ａ、１４ｂから位置検出用信号を送信する。 The in-vehicle transmission unit 14 is a circuit that modulates the signal output from the in-vehicle control unit 11 into an LF band signal, and transmits the modulated signals to the detection device 2 from the plurality of LF transmission antennas 14a and 14b, respectively. . The carrier wave uses the LF band of 30 kHz to 300 kHz, but is not limited to this frequency band.
For example, when detecting the air pressure of the tire 3 at an arbitrary timing, the in-vehicle transmission unit 14 transmits a request signal for requesting air pressure information from the LF transmission antenna 14 a to each detection device 2. Further, the in-vehicle transmission unit 14 sends a signal for switching the operation mode of the detection device 2 at a required timing, that is, a restriction signal for restricting the operation of the detection device 2 and a release signal for releasing the restriction from the LF transmission antenna 14a. Send. Specifically, the restriction signal restricts the operation in which the detection device 2 continuously transmits a predetermined signal using radio waves in the UHF band when the tire 3 is filled with air or when the tire 3 is punctured. . Furthermore, the vehicle-mounted transmission part 14 transmits the signal for a position detection from LF transmission antenna 14a, 14b, when performing the position detection of the portable apparatus 9. FIG.
　入出力部１５は、信号を入出力するインタフェースであり、報知装置４、車速センサ５、イグニッションスイッチ６、測位装置７及びドアＥＣＵ８に接続されている。なお、入出力部１５は、ＣＡＮ（Controller Area Network）又はＬＩＮ（Local Interconnect Network）等の通信プロトコルに従って通信を行う通信回路であっても良い。
　入出力部１５は、車載制御部１１の制御に従って、タイヤ３の空気圧に係る情報を報知装置４へ送信する。また。車載制御部１１は、入出力部１５を介して車速センサ５、イグニッションスイッチ６及び測位装置７から出力される信号を取得する。 The input / output unit 15 is an interface for inputting and outputting signals, and is connected to the notification device 4, the vehicle speed sensor 5, the ignition switch 6, the positioning device 7, and the door ECU 8. The input / output unit 15 may be a communication circuit that performs communication according to a communication protocol such as CAN (Controller Area Network) or LIN (Local Interconnect Network).
The input / output unit 15 transmits information related to the air pressure of the tire 3 to the notification device 4 under the control of the in-vehicle control unit 11. Also. The in-vehicle control unit 11 acquires signals output from the vehicle speed sensor 5, the ignition switch 6, and the positioning device 7 via the input / output unit 15.
　報知装置４は、例えば、入出力部１５から出力されたタイヤ３の空気圧に係る情報を画像によって報知するメータディスプレイ、マルチインフォメーションディスプレイ、ヘッドアップディスプレイ等の表示部である。例えば、報知装置４は、車両Ｃに設けられた各タイヤ３の空気圧情報を、車両Ｃを模した画像及び数値で表示する。また、報知装置４は、車載制御部１１から送信される情報に基づいて、タイヤ３に空気圧が充填されたこと、タイヤ３の空気圧が急激に減少していること等を報知する。報知装置４は、画像又は音声によって報知する表示部又はスピーカを備えたオーディオ機器等であっても良い。表示部は液晶ディスプレイ、有機ＥＬディスプレイ等である。
　また、報知装置４は、ブザーを含む構成であっても良い。ブザーは、タイヤ３の空気圧充填、タイヤ空気圧の低下等を知らせる警告音を出力する音声出力装置である。車載制御部１１は、入出力部１５を介して、ブザーオン信号をブザーへ出力することによって、警告音を出力させることができる。 The notification device 4 is, for example, a display unit such as a meter display, a multi-information display, a head-up display, or the like that notifies information related to the air pressure of the tire 3 output from the input / output unit 15 by an image. For example, the notification device 4 displays the air pressure information of each tire 3 provided in the vehicle C as an image and a numerical value imitating the vehicle C. Further, the notification device 4 notifies the tire 3 that the air pressure is filled, the air pressure of the tire 3 is rapidly decreasing, based on the information transmitted from the in-vehicle control unit 11. The notification device 4 may be an audio device or the like provided with a display unit or a speaker for notification by image or sound. The display unit is a liquid crystal display, an organic EL display, or the like.
Further, the notification device 4 may be configured to include a buzzer. The buzzer is an audio output device that outputs a warning sound notifying that the tire 3 is filled with air pressure, a decrease in tire air pressure, or the like. The in-vehicle control unit 11 can output a warning sound by outputting a buzzer on signal to the buzzer via the input / output unit 15.
　車速センサ５は、例えば車両Ｃに備えられた車軸の回転数に比例した信号を発信する磁気ピックアップ、ホール素子等を備えた非接触センサ、及び当該非接触センサからのパルス数を計測する計数回路を備え、パルス数を計測することによって車両Ｃの速度を検出する。非接触センサは車速センサ５の一例であり、かかる構造に限定されるものでは無い。例えば、ＧＰＳにて検出した車両Ｃの位置の情報を取得し、車両Ｃの位置の変化に基づいて、車両Ｃの速度を検出するように車速センサ５を構成しても良い。 The vehicle speed sensor 5 includes, for example, a magnetic pickup that transmits a signal proportional to the rotational speed of an axle provided in the vehicle C, a non-contact sensor that includes a hall element, and a counting circuit that measures the number of pulses from the non-contact sensor. And detecting the speed of the vehicle C by measuring the number of pulses. The non-contact sensor is an example of the vehicle speed sensor 5 and is not limited to such a structure. For example, the vehicle speed sensor 5 may be configured to acquire information on the position of the vehicle C detected by GPS and detect the speed of the vehicle C based on a change in the position of the vehicle C.
　入出力部１５には、イグニッションスイッチ６の操作状態に応じたイグニッションスイッチ６信号が入力しており、車載制御部１１は、入出力部１５に入力したイグニッションスイッチ６信号に基づいて、イグニッションスイッチ６の操作状態を認識することができる。 An ignition switch 6 signal corresponding to the operation state of the ignition switch 6 is input to the input / output unit 15, and the vehicle-mounted control unit 11 receives the ignition switch 6 based on the ignition switch 6 signal input to the input / output unit 15. Can be recognized.
　測位装置７は、ＧＰＳ受信機を備える。ＧＰＳ受信機は、人工衛星（ＧＰＳ衛星）と共にＧＰＳシステムを構成しており、人工衛星からの電波を受信し、自身の位置を検出する。測位装置７は、車載制御部１１の求めに応じて、現在の位置情報を車載制御部１１へ出力する。 The positioning device 7 includes a GPS receiver. The GPS receiver constitutes a GPS system together with an artificial satellite (GPS satellite), receives radio waves from the artificial satellite, and detects its own position. The positioning device 7 outputs the current position information to the in-vehicle control unit 11 in response to the request from the in-vehicle control unit 11.
　ドアＥＣＵ８は、車両ドアの施錠及び解錠を行う施解錠装置を駆動するアクチュエータを備える。車載機１は、車両ドアのリクエストスイッチが操作された場合、携帯機９の位置検出を行い、携帯機９を認証すると共に当該携帯機９が車外にあるか否かを判定し、正規の携帯機９が操作されたリクエストスイッチの車外周辺に位置している場合、施錠信号又は解錠信号をドアＥＣＵ８へ送信する。また、車載機１は、イグニッションスイッチ６がオフ状態で車両ドアの開閉が行われた場合、携帯機９の位置を検出する。携帯機９が車両から離れた場合、車載機１は、施錠信号をドアＥＣＵ８へ送信する。ドアＥＣＵ８は、施錠信号を受信した場合、施解錠装置を駆動させ、車両ドアを施錠する。
　また、ドアＥＣＵ８は、車内の施解錠スイッチの操作に応じて、施解錠装置の動作を制御し、車両ドアを施錠又は解錠することができ、車両ドアの施解錠状態を示す情報を、通信線を介して車載機１へ送信することができる。車載機１は、ドアＥＣＵ８から送信される当該情報を入出力部１５にて受信することによって、車両ドアの施解錠状態を認識することができる。 The door ECU 8 includes an actuator that drives a locking / unlocking device that locks and unlocks the vehicle door. When the request switch on the vehicle door is operated, the vehicle-mounted device 1 detects the position of the portable device 9, authenticates the portable device 9, determines whether the portable device 9 is outside the vehicle, When the machine 9 is located in the periphery of the operated request switch, a lock signal or an unlock signal is transmitted to the door ECU 8. Moreover, the vehicle equipment 1 detects the position of the portable device 9 when the ignition switch 6 is turned off and the vehicle door is opened and closed. When the portable device 9 leaves the vehicle, the in-vehicle device 1 transmits a locking signal to the door ECU 8. When the door ECU 8 receives the locking signal, the door ECU 8 drives the locking / unlocking device to lock the vehicle door.
Further, the door ECU 8 can control the operation of the locking / unlocking device in accordance with the operation of the locking / unlocking switch in the vehicle, and can lock or unlock the vehicle door, and communicates information indicating the locking / unlocking state of the vehicle door. It can transmit to the vehicle equipment 1 via a line. The in-vehicle device 1 can recognize the locked / unlocked state of the vehicle door by receiving the information transmitted from the door ECU 8 at the input / output unit 15.
　図３は、本発明の実施形態に係る検出装置２の一構成例を示すブロック図である。検出装置２は、該検出装置２の各構成部の動作を制御するセンサ制御部（制御部）２１を備える。センサ制御部２１には、センサ用記憶部２２、センサ送信部（送信部）２３、センサ受信部（受信部）２４、空気圧検出部２５、温度検出部２６及び加速度センサ２７が接続されている。 FIG. 3 is a block diagram showing a configuration example of the detection apparatus 2 according to the embodiment of the present invention. The detection device 2 includes a sensor control unit (control unit) 21 that controls the operation of each component of the detection device 2. A sensor storage unit 22, a sensor transmission unit (transmission unit) 23, a sensor reception unit (reception unit) 24, an air pressure detection unit 25, a temperature detection unit 26, and an acceleration sensor 27 are connected to the sensor control unit 21.
　センサ制御部２１は、例えば一又は複数のＣＰＵ、マルチコアＣＰＵ、ＲＯＭ、ＲＡＭ、入出力インタフェース等を有するマイコンである。センサ制御部２１のＣＰＵは入出力インタフェースを介してセンサ用記憶部２２、センサ送信部２３、センサ受信部２４、空気圧検出部２５、温度検出部２６及び加速度センサ２７に接続している。センサ制御部２１はセンサ用記憶部２２に記憶されている制御プログラムを読み出し、各部を制御する。検出装置２は、図示しない電池を備え、当該電池からの電力により動作する。 The sensor control unit 21 is a microcomputer having, for example, one or a plurality of CPUs, a multi-core CPU, a ROM, a RAM, an input / output interface, and the like. The CPU of the sensor control unit 21 is connected to the sensor storage unit 22, the sensor transmission unit 23, the sensor reception unit 24, the air pressure detection unit 25, the temperature detection unit 26, and the acceleration sensor 27 via an input / output interface. The sensor control unit 21 reads a control program stored in the sensor storage unit 22 and controls each unit. The detection device 2 includes a battery (not shown) and operates with electric power from the battery.
　センサ用記憶部２２は不揮発性メモリである。センサ用記憶部２２には、センサ制御部２１のＣＰＵがタイヤ３の空気圧の検出及び送信に係る処理を行うための制御プログラムが記憶されている。また、自装置と、他の検出装置２とを識別するための固有のセンサ識別子を記憶している。 The sensor storage unit 22 is a nonvolatile memory. The sensor storage unit 22 stores a control program for the CPU of the sensor control unit 21 to perform processing related to detection and transmission of the air pressure of the tire 3. Further, a unique sensor identifier for identifying the own device and the other detection device 2 is stored.
　センサ送信部２３には、ＲＦ送信アンテナ２３ａが接続されている。センサ送信部２３は、センサ制御部２１が生成した空気圧信号をＵＨＦ帯の信号に変調し、変調した空気圧信号を、ＲＦ送信アンテナ２３ａを用いて送信する。
　また、センサ送信部２３は、タイヤ３の空気圧が急激に増減した場合、ＲＦ送信アンテナ２３ａを用いて所定信号を継続的に送信する。例えば、タイヤ３の空気充填が行われた場合、タイヤ３の空気圧が急激に減少した場合、所定信号が送信される。 An RF transmission antenna 23 a is connected to the sensor transmission unit 23. The sensor transmission unit 23 modulates the air pressure signal generated by the sensor control unit 21 into a UHF band signal, and transmits the modulated air pressure signal using the RF transmission antenna 23a.
Moreover, the sensor transmission part 23 transmits a predetermined signal continuously using RF transmission antenna 23a, when the air pressure of the tire 3 increases / decreases rapidly. For example, when the air filling of the tire 3 is performed, and the air pressure of the tire 3 is rapidly reduced, a predetermined signal is transmitted.
　センサ受信部２４には、ＬＦ受信アンテナ２４ａが接続されている。センサ受信部２４は、車載機１からＬＦ帯の電波を用いて送信された信号を、ＬＦ受信アンテナ２４ａにて受信し、受信した信号をセンサ制御部２１へ出力する。車載機１から送信される信号は、例えば、空気圧情報を要求する要求信号、検出装置２の動作モードの切り替えを指示する信号、即ち制限信号、解除信号等である。 The sensor receiving unit 24 is connected to an LF receiving antenna 24a. The sensor receiving unit 24 receives a signal transmitted from the vehicle-mounted device 1 using radio waves in the LF band by the LF receiving antenna 24 a and outputs the received signal to the sensor control unit 21. The signal transmitted from the vehicle-mounted device 1 is, for example, a request signal for requesting air pressure information, a signal for instructing switching of the operation mode of the detection device 2, that is, a restriction signal, a release signal, or the like.
　空気圧検出部２５は、例えばダイヤフラムを備え、圧力の大きさによって変化するダイヤフラムの変形量に基づき、タイヤ３の空気圧を検出する。空気圧検出部２５は検出したタイヤ３の空気圧を示す信号をセンサ制御部２１へ出力する。 The air pressure detection unit 25 includes a diaphragm, for example, and detects the air pressure of the tire 3 based on the deformation amount of the diaphragm that changes depending on the magnitude of the pressure. The air pressure detection unit 25 outputs a signal indicating the detected air pressure of the tire 3 to the sensor control unit 21.
　温度検出部２６は、例えば温度によって電気抵抗が変化する素子を備え、温度変化によって変化する素子間の電圧に基づき、タイヤ３の温度を検出する。温度検出部２６は検出したタイヤ３の温度を示す信号をセンサ制御部２１へ出力する。 The temperature detection unit 26 includes, for example, an element whose electric resistance changes with temperature, and detects the temperature of the tire 3 based on the voltage between the elements that changes with temperature change. The temperature detection unit 26 outputs a signal indicating the detected temperature of the tire 3 to the sensor control unit 21.
　加速度センサ２７は、タイヤ３の回転によって検出装置２に加わる加速度を検出し、加速度信号をセンサ制御部２１へ出力する。 The acceleration sensor 27 detects the acceleration applied to the detection device 2 by the rotation of the tire 3 and outputs an acceleration signal to the sensor control unit 21.
　センサ制御部２１は、制御プログラムを実行することにより、要求信号に応じて、空気圧検出部２５及び温度検出部２６からタイヤ３の空気圧及び温度の情報を取得し、空気圧、温度及び検出装置２に固有のセンサ識別子等を含む空気圧信号を生成し、センサ送信部２３へ出力する。
　また、センサ制御部２１は、タイヤ３が回転し、加速度センサ２７から加速度信号が出力された場合、空気圧、温度及び検出装置２に固有のセンサ識別子等を含む空気圧信号を生成し、センサ送信部２３へ出力する。
　更に、センサ制御部２１は、タイヤ３の空気圧が急激に増減した場合、所定信号をセンサ送信部２３へ出力する。
　但し、制限信号を受信し、所定信号の送信を制限する制限モードで動作している場合、センサ制御部２１は、タイヤ３の空気充填、パンク等が検出されても所定信号の出力を行わない。 The sensor control unit 21 acquires the air pressure and temperature information of the tire 3 from the air pressure detection unit 25 and the temperature detection unit 26 according to the request signal by executing the control program, and sends the information to the air pressure, temperature and detection device 2. A pneumatic signal including a unique sensor identifier or the like is generated and output to the sensor transmission unit 23.
In addition, when the tire 3 rotates and an acceleration signal is output from the acceleration sensor 27, the sensor control unit 21 generates an air pressure signal including air pressure, temperature, a sensor identifier unique to the detection device 2, and the like, and a sensor transmission unit To 23.
Further, the sensor control unit 21 outputs a predetermined signal to the sensor transmission unit 23 when the air pressure of the tire 3 rapidly increases or decreases.
However, when operating in a restriction mode that receives a restriction signal and restricts transmission of the predetermined signal, the sensor control unit 21 does not output the predetermined signal even if air filling or puncture of the tire 3 is detected. .
　図４は、本発明の実施形態に係る携帯機９の一構成例を示すブロック図である。携帯機９は、該携帯機９の各構成部の動作を制御する携帯側制御部９１を備える。携帯側制御部９１は、例えば一又は複数のＣＰＵ、マルチコアＣＰＵ等を有するマイコンである。携帯側制御部９１には、携帯側受信部９２、携帯側送信部９３、携帯側記憶部９４及び受信信号強度測定部９５が設けられている。 FIG. 4 is a block diagram showing a configuration example of the portable device 9 according to the embodiment of the present invention. The portable device 9 includes a portable control unit 91 that controls the operation of each component of the portable device 9. The portable side control unit 91 is a microcomputer having, for example, one or a plurality of CPUs, a multi-core CPU, and the like. The portable side control unit 91 includes a portable side reception unit 92, a portable side transmission unit 93, a portable side storage unit 94, and a received signal strength measurement unit 95.
　携帯側制御部９１は、携帯側記憶部９４に記憶されている後述の制御プログラムを読み出し、各構成部の動作を制御することにより、各構成部の動作を制御し、車載機１に対する携帯機９の位置検出に必要な情報を車載機１へ送信する処理を実行する。 The portable side control unit 91 reads out a control program, which will be described later, stored in the portable side storage unit 94 and controls the operation of each component unit, thereby controlling the operation of each component unit. The process which transmits the information required for the position detection of 9 to the vehicle equipment 1 is performed.
　携帯側記憶部９４は、記憶部１２と同様の不揮発性メモリである。携帯側記憶部９４は、携帯側制御部９１が携帯機９の各構成部の動作を制御することにより、携帯機９の位置を検出するための情報を含む応答信号等を車載機１へ送信する処理を実行するための制御プログラムを記憶している。 The portable storage unit 94 is a non-volatile memory similar to the storage unit 12. The portable storage unit 94 transmits a response signal including information for detecting the position of the portable device 9 to the in-vehicle device 1 by the portable control unit 91 controlling the operation of each component of the portable device 9. A control program for executing the processing to be performed is stored.
　携帯側受信部９２は携帯側ＬＦ受信アンテナ９２ａに接続されており、車載機１からＬＦ帯の電波を用いて送信された位置検出用信号等の各種信号を受信し、携帯側制御部９１へ出力する。携帯側ＬＦ受信アンテナ９２ａは例えば３軸アンテナであり、車両Ｃに対する携帯機９の向き又は姿勢に拘わらず、一定の受信信号強度が得られる。 The portable-side receiving unit 92 is connected to the portable-side LF receiving antenna 92 a, receives various signals such as a position detection signal transmitted from the vehicle-mounted device 1 using radio waves in the LF band, and sends it to the portable-side control unit 91. Output. The portable-side LF reception antenna 92a is, for example, a three-axis antenna, and a constant received signal strength can be obtained regardless of the orientation or posture of the portable device 9 with respect to the vehicle C.
　受信信号強度測定部９５は、複数のＬＦ送信アンテナ１４ａから送信され、携帯側ＬＦ受信アンテナ９２ａが受信した各位置検出用信号の受信信号強度を検出し、検出した受信信号強度を携帯側制御部９１へ出力する回路である。 The received signal strength measuring unit 95 detects the received signal strength of each position detection signal transmitted from the plurality of LF transmitting antennas 14a and received by the portable LF receiving antenna 92a, and the detected received signal strength is detected by the portable control unit. 91 is a circuit that outputs the data to 91.
　携帯側送信部９３は携帯側ＲＦ送信アンテナ９３ａに接続されており、携帯側制御部９１の制御に従って、携帯機９から送信された信号に応じた信号を送信する。位置検出用信号を携帯機９が受信した場合、携帯側制御部９１の制御に従って携帯側送信部９３は、車載機１に対する携帯機９の位置を検出するための情報として、受信信号強度測定部９５が測定した受信信号強度を含む応答信号を送信する。携帯側送信部９３はＵＨＦ帯の電波を用いて応答信号を送信する。なおＵＨＦ帯は信号を送信する電波帯域の一例であり、必ずしもこれに限定されない。 The portable side transmission unit 93 is connected to the portable side RF transmission antenna 93a, and transmits a signal corresponding to the signal transmitted from the portable device 9 according to the control of the portable side control unit 91. When the portable device 9 receives the position detection signal, the portable-side transmitter 93 receives information for detecting the position of the portable device 9 relative to the vehicle-mounted device 1 according to the control of the portable-side controller 91. 95 transmits a response signal including the received signal strength measured. The portable-side transmitter 93 transmits a response signal using UHF radio waves. The UHF band is an example of a radio wave band for transmitting signals, and is not necessarily limited to this.
　このように構成された車両用通信システムにおいては、車載機１は検出装置２との間で無線通信を行うことにより、タイヤ３の空気圧を監視することができる。具体的には、車載機１は、任意のタイミングでＬＦ送信アンテナ１４ａから要求信号を送信し、要求信号に応じて検出装置２から送信される空気圧信号を受信することによって、各タイヤ３の空気圧を検出し、監視することができる。また、車両Ｃの走行中においては、検出装置２から自発的に空気圧信号が送信され、車載機１は各検出装置２から送信される空気圧信号を受信することによって、各タイヤ３の空気圧を監視することができる。更に、タイヤ３の空気充填、パンク等によってタイヤ３の空気圧が急激に増減した場合、検出装置２から所定信号が送信され、車載機１は所定信号を受信することによって、タイヤ３の空気圧充填、パンク等を検知することができ、報知装置４を用いて当該異常を報知することができる。 In the vehicle communication system configured as described above, the in-vehicle device 1 can monitor the air pressure of the tire 3 by performing wireless communication with the detection device 2. Specifically, the in-vehicle device 1 transmits a request signal from the LF transmission antenna 14a at an arbitrary timing, and receives an air pressure signal transmitted from the detection device 2 in response to the request signal, whereby the air pressure of each tire 3 is received. Can be detected and monitored. While the vehicle C is traveling, an air pressure signal is spontaneously transmitted from the detection device 2, and the vehicle-mounted device 1 monitors the air pressure of each tire 3 by receiving the air pressure signal transmitted from each detection device 2. can do. Further, when the air pressure of the tire 3 is suddenly increased or decreased due to air filling, puncture or the like of the tire 3, a predetermined signal is transmitted from the detection device 2, and the in-vehicle device 1 receives the predetermined signal, thereby filling the air pressure of the tire 3; A puncture or the like can be detected, and the abnormality can be notified using the notification device 4.
　一方、車載機１は、リクエストスイッチが操作された場合、エンジンスタートボタンが操作された場合、エンジン停止後、車両ドアが開閉した場合等、所要のタイミングで携帯機９の位置検出を行い、携帯機９の位置に応じて、車両ドアの施解錠、エンジン始動等の所定の処理を実行する。 On the other hand, the vehicle-mounted device 1 detects the position of the portable device 9 at a required timing such as when the request switch is operated, when the engine start button is operated, when the vehicle door is opened and closed after the engine stops, Depending on the position of the machine 9, predetermined processing such as locking / unlocking of the vehicle door, engine starting, and the like is executed.
　次に、検出装置２の動作モードの切り替え方法について説明する。
　図５及び図６は、検出装置２の動作モードの切り替えに係る処理手順を示すフローチャート、図７は検出装置２の動作モードの切り替え方法を示すタイミングチャートである。 Next, a method for switching the operation mode of the detection device 2 will be described.
5 and 6 are flowcharts showing a processing procedure related to switching of the operation mode of the detection apparatus 2, and FIG. 7 is a timing chart showing a method of switching the operation mode of the detection apparatus 2.
　図７中、「車両状態（車両）」は、車両Ｃが駐車、停車、走行のいずれの状態にあるか否かを示している。「ＩＧスイッチ状態」は、イグニッションスイッチ６がオン状態にあるか、オフ状態にあるかを示している。「切替信号（車載機）」は、車載機１から送信される制限信号、解除信号等の切替信号の送信タイミングを示している。ハッチングが付された矩形ブロックは、タイヤ空気圧の急激な増減時に送信される所定信号の送信を制限する制限モードへの切り替えを指示する切替信号を示し、白抜きの矩形ブロックは、上記制限モードが解除された非制限モードへの切り替えを指示する切替信号を示す。「ＴＰＭＳ無線信号（検出装置）」は、検出装置２の動作モードを示している。例えば、ハッチングが付された「トリガ応答の空気圧信号のみ」は、所定信号の送信が制限され、車載機１からの要求があったときに限り、空気圧信号を送信する制限モードを示している。白抜き部分は、所定信号の送信が制限されていない非制限モードを示している。「施解錠等無線信号（携帯機）」は、車両ドアの施解錠、走行中における携帯機９の存否確認等、車載機１との無線通信の過程で携帯機９から応答信号が送信されることを示している。「キー操作無線信号（携帯機）」は、携帯機９を用いた車両ドアの施解錠操作によって、携帯機９から信号が送信されることを示している。 7, “Vehicle state (vehicle)” indicates whether the vehicle C is in a parked state, a stopped state, or a traveling state. “IG switch state” indicates whether the ignition switch 6 is in an on state or an off state. “Switching signal (on-vehicle device)” indicates the transmission timing of a switching signal such as a restriction signal and a release signal transmitted from the on-vehicle device 1. A rectangular block with hatching indicates a switching signal for instructing switching to a restriction mode that restricts transmission of a predetermined signal that is transmitted when the tire pressure rapidly increases and decreases. The switching signal which instruct | indicates switching to the canceled non-restriction mode is shown. The “TPMS radio signal (detection device)” indicates the operation mode of the detection device 2. For example, “only the trigger response pneumatic signal” indicated by hatching indicates a restriction mode in which transmission of a predetermined signal is restricted and a pneumatic signal is transmitted only when there is a request from the vehicle-mounted device 1. A white portion indicates an unrestricted mode in which transmission of a predetermined signal is not restricted. “Wireless signal for locking / unlocking (portable device)” is a response signal transmitted from the portable device 9 in the process of wireless communication with the in-vehicle device 1 such as locking / unlocking of the vehicle door, confirmation of the presence / absence of the portable device 9 while traveling It is shown that. The “key operation radio signal (portable device)” indicates that a signal is transmitted from the portable device 9 by a locking / unlocking operation of the vehicle door using the portable device 9.
　図７に示すように本実施形態１に係る車両用通信システムにおいては、イグニッションスイッチ６がオフ状態からオン状態へ切り替えられた場合、検出装置２は非制限モードに切り替えられる。そして、イグニッションスイッチ６がオン状態に切り替えられてから所定時間が経過した場合、検出装置２は、制限モードに切り替えられ、車両Ｃが走行を開始すると再び検出装置２は非制限モードに切り替えられる。最後に車両Ｃが停車し、イグニッションスイッチ６がオフ状態になると、再び検出装置２は制限モードに切り替えられる。
　このように動作モードを切り替えることによって、タイヤ空気圧の監視が重要な状況においては、検出装置２を非制限モードで動作させ、車両ドアの施解錠を行う等、携帯機９との無線通信が重要な状況においては検出装置２を制限モードとすることによって、携帯機９から送信される信号と、検出装置２から送信される信号との混信を抑制することができる。 As shown in FIG. 7, in the vehicle communication system according to the first embodiment, when the ignition switch 6 is switched from the off state to the on state, the detection device 2 is switched to the unrestricted mode. When a predetermined time has elapsed since the ignition switch 6 was switched on, the detection device 2 is switched to the restriction mode, and when the vehicle C starts traveling, the detection device 2 is switched to the non-restriction mode again. Finally, when the vehicle C stops and the ignition switch 6 is turned off, the detection device 2 is switched to the restriction mode again.
By switching the operation mode in this manner, in a situation where it is important to monitor the tire pressure, wireless communication with the portable device 9 is important, such as operating the detection device 2 in an unrestricted mode and locking and unlocking the vehicle door. In such a situation, interference between the signal transmitted from the portable device 9 and the signal transmitted from the detection device 2 can be suppressed by setting the detection device 2 in the restriction mode.
　以下、検出装置２の動作モードの切り替えに係る車載機１の具体的な処理手順を説明する。
　車載機１の車載制御部１１は、イグニッションスイッチ６の操作状態を監視しており、イグニッションスイッチ６がオフ状態からオン状態になったか否かを判定する（ステップＳ１１）。イグニッションスイッチ６がオフ状態であると判定した場合（ステップＳ１１：ＮＯ）、車載制御部１１は処理をステップＳ１１へ戻し待機する。イグニッションスイッチ６がオフ状態からオン状態になったと判定した場合（ステップＳ１１：ＹＥＳ）、車載制御部１１は、非制限モードへの切り替えを指示する切替信号、即ち解除信号を車載送信部１４に送信させる（ステップＳ１２）。当該解除信号を受信した検出装置２は、制限モードから非制限モードへ移行する。 Hereinafter, a specific processing procedure of the vehicle-mounted device 1 related to switching of the operation mode of the detection device 2 will be described.
The vehicle-mounted control unit 11 of the vehicle-mounted device 1 monitors the operation state of the ignition switch 6 and determines whether or not the ignition switch 6 has changed from the off state to the on state (step S11). When it determines with the ignition switch 6 being an OFF state (step S11: NO), the vehicle-mounted control part 11 returns a process to step S11, and waits. When it is determined that the ignition switch 6 has changed from the off state to the on state (step S11: YES), the in-vehicle control unit 11 transmits a switching signal instructing switching to the non-restricted mode, that is, a release signal to the in-vehicle transmission unit 14. (Step S12). The detection apparatus 2 that has received the release signal shifts from the restricted mode to the non-restricted mode.
　そして、車載制御部１１は、各検出装置２と無線通信を行うことにより、各タイヤ３の空気圧を検出及び監視する（ステップＳ１３）。 And the vehicle-mounted control part 11 detects and monitors the air pressure of each tire 3 by performing radio | wireless communication with each detection apparatus 2 (step S13).
　次いで、車載制御部１１は、非制限モードへの切り替えを指示してから所定時間が経過したか否かを判定する（ステップＳ１４）。所定時間が経過していないと判定した場合（ステップＳ１４：ＮＯ）、車載制御部１１は処理をステップＳ１３へ戻す。 Next, the in-vehicle control unit 11 determines whether or not a predetermined time has elapsed after instructing the switching to the non-restricted mode (step S14). When it determines with predetermined time not having passed (step S14: NO), the vehicle-mounted control part 11 returns a process to step S13.
　所定時間が経過したと判定した場合（ステップＳ１４：ＹＥＳ）、車載制御部１１は、現在、検出装置２が非制限モードにあるか否かを判定する（ステップＳ１５）。非制限モードにあると判定した場合（ステップＳ１５：ＹＥＳ）、車載制御部１１は、制限モードへの切り替えを指示する切替信号、即ち制限信号を車載送信部１４に送信させる（ステップＳ１６）。当該制限信号を受信した検出装置２は、制限モードへ移行する。 When it is determined that the predetermined time has elapsed (step S14: YES), the vehicle-mounted control unit 11 determines whether or not the detection device 2 is currently in the non-restricted mode (step S15). When it determines with it being in non-restriction mode (step S15: YES), the vehicle-mounted control part 11 transmits the switching signal which instruct | indicates switching to restriction | limiting mode, ie, a restriction signal, to the vehicle-mounted transmission part 14 (step S16). The detection device 2 that has received the restriction signal shifts to the restriction mode.
　ステップＳ１６の処理を終えた場合、非制限モードで無いと判定した場合（ステップＳ１５：ＮＯ）、車載制御部１１は、車速センサ５からの信号を取得し、車両Ｃが走行しているか否かを判定する（ステップＳ１７）。車両Ｃが走行していないと判定した場合（ステップＳ１７：ＮＯ）、車載制御部１１は処理をステップＳ１３へ戻す。 When the process of step S16 is completed, when it is determined that it is not the non-restricted mode (step S15: NO), the in-vehicle control unit 11 acquires a signal from the vehicle speed sensor 5 and determines whether or not the vehicle C is traveling. Is determined (step S17). When it determines with the vehicle C not driving | running | working (step S17: NO), the vehicle-mounted control part 11 returns a process to step S13.
　車両Ｃが走行していると判定した場合（ステップＳ１７：ＹＥＳ）、車載制御部１１は、非制限モードへの切り替えを指示する切替信号、即ち解除信号を車載送信部１４に送信させる（ステップＳ１８）。当該解除信号を受信した検出装置２は、非制限モードへ移行する。 When it is determined that the vehicle C is traveling (step S17: YES), the in-vehicle control unit 11 causes the in-vehicle transmission unit 14 to transmit a switching signal for instructing switching to the non-restricted mode (step S18). ). The detection apparatus 2 that has received the release signal shifts to the non-restricted mode.
　そして、車載制御部１１は、各検出装置２と無線通信を行うことにより、各タイヤ３の空気圧を検出及び監視する（ステップＳ１９）。次いで、車載制御部１１は、イグニッションスイッチ６がオン状態からオフ状態になったか否かを判定する（ステップＳ２０）。イグニッションスイッチ６がオン状態であると判定した場合（ステップＳ２０：ＮＯ）、車載制御部１１は処理をステップＳ１９へ戻し、タイヤ空気圧の監視を継続する。イグニッションスイッチ６がオン状態からオフ状態になったと判定した場合（ステップＳ２０：ＹＥＳ）、車載制御部１１は、制限モードへの切り替えを指示する切替信号、即ち制限信号を車載送信部１４に送信させ（ステップＳ２１）、処理を終える。 And the vehicle-mounted control part 11 detects and monitors the air pressure of each tire 3 by performing radio | wireless communication with each detection apparatus 2 (step S19). Next, the vehicle-mounted control unit 11 determines whether or not the ignition switch 6 has changed from the on state to the off state (step S20). When it determines with the ignition switch 6 being an ON state (step S20: NO), the vehicle-mounted control part 11 returns a process to step S19, and continues monitoring of a tire air pressure. When it is determined that the ignition switch 6 has changed from the on state to the off state (step S20: YES), the in-vehicle control unit 11 causes the in-vehicle transmission unit 14 to transmit a switching signal that instructs switching to the restriction mode, that is, the restriction signal. (Step S21), the process ends.
　このように構成された車両用通信システムによれば、車両Ｃの施解錠等制御に用いられる携帯機９から送信される信号と、タイヤ空気圧の監視に用いられる検出装置２から送信される信号との混信を抑制することができる。 According to the vehicle communication system configured as described above, a signal transmitted from the portable device 9 used for controlling the locking and unlocking of the vehicle C, and a signal transmitted from the detection device 2 used for monitoring the tire air pressure. Interference can be suppressed.
　また、イグニッションスイッチ６がオフ状態からオン状態へ切り替えられた後、所定時間の間、検出装置２は非制限モードとなり、空気圧の監視が優先される。つまり、車載機１は、タイヤ３の空気充填、タイヤ空気圧の急激な増減状態を監視することができる。 In addition, after the ignition switch 6 is switched from the off state to the on state, the detection device 2 is in the non-restricted mode for a predetermined time, and air pressure monitoring has priority. That is, the in-vehicle device 1 can monitor the air filling of the tire 3 and the rapid increase / decrease state of the tire air pressure.
　上記所定時間が経過した場合、空気圧監視の重要度が低下するため、検出装置２は制限モードとなり、携帯機９からの所定信号の送信が抑制される。当該状態においては、検出装置２から送信される信号と、携帯機９から送信される信号との混信が抑制される。 When the predetermined time has elapsed, the importance of air pressure monitoring decreases, so that the detection device 2 enters the restriction mode, and transmission of the predetermined signal from the portable device 9 is suppressed. In this state, interference between the signal transmitted from the detection device 2 and the signal transmitted from the portable device 9 is suppressed.
　更に、車両走行中においては、検出装置２は非制限モードに切り替えられ、タイヤ空気圧の急激な増減を監視することが可能になる。 Furthermore, while the vehicle is running, the detection device 2 is switched to the non-restricted mode, and it becomes possible to monitor a rapid increase / decrease in tire pressure.
　車両走行後、イグニッションスイッチ６がオフ状態になった場合、空気圧の監視よりも、携帯機９との無線通信の重要度が高くなるため、検出装置２は非制限モードとなり、検出装置２から送信される信号と、携帯機９から送信される信号との混信が抑制される。 When the ignition switch 6 is turned off after traveling the vehicle, the importance of wireless communication with the portable device 9 is higher than the monitoring of the air pressure, so that the detection device 2 is in the non-restricted mode and transmitted from the detection device 2 Interference between the transmitted signal and the signal transmitted from the portable device 9 is suppressed.
（変形例）
　なお、上記実施形態では、イグニッションスイッチ６がオフ状態からオン状態に切り替えられた場合、検出装置２が非制限モードへ移行する例を説明したが、タイヤ３の空気圧充填が行われる可能性が高い位置に車両Ｃが位置する場合に限り、車載機１は解除信号を送信するように構成しても良い。例えば、車載機１は、ガソリンスタンド、自宅等、タイヤ３の空気充填が行われる可能性がある特定位置を記憶している。車載機１は、測位装置７にて検出された車両Ｃの位置が特定位置である場合、車載送信部１４にて検出装置２へ解除信号を送信し、車両Ｃの位置が特定位置で無い場合、解除信号を送信せず、検出装置２を制限モードのままとする。
　このように構成された車両用通信システムによれば、車両Ｃが駐車又は停車している場合であって、タイヤ３の空気充填が行われる可能性が低い場合、検出装置２を制限モードで動作させることにより、検出装置２から送信される信号と、携帯機９から送信される信号との混信を効果的に抑制することができる。 (Modification)
In the above embodiment, the example in which the detection device 2 shifts to the non-restricted mode when the ignition switch 6 is switched from the off state to the on state has been described. However, there is a high possibility that the tire 3 is filled with air pressure. Only when the vehicle C is located at the position, the vehicle-mounted device 1 may be configured to transmit a release signal. For example, the in-vehicle device 1 stores a specific position where the tire 3 may be filled with air, such as a gas station or a home. When the position of the vehicle C detected by the positioning device 7 is a specific position, the in-vehicle device 1 transmits a release signal to the detection device 2 by the in-vehicle transmission unit 14 and the position of the vehicle C is not the specific position. The release signal is not transmitted, and the detection device 2 is left in the restriction mode.
According to the vehicle communication system configured as described above, when the vehicle C is parked or stopped and the possibility that the tire 3 is filled with air is low, the detection device 2 is operated in the restriction mode. By doing so, interference between the signal transmitted from the detection device 2 and the signal transmitted from the portable device 9 can be effectively suppressed.
　今回開示された実施形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上記した意味ではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined not by the above-described meaning but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
　１　車載機（監視装置）
　２　検出装置
　３　タイヤ
　４　報知装置
　５　車速センサ
　６　イグニッションスイッチ
　７　測位装置
　８　ドアＥＣＵ
　９　携帯機
　１１　車載制御部
　１２　記憶部
　１３　車載受信部
　１３ａ　ＲＦ受信アンテナ
　１４　車載送信部
　１４ａ，１４ｂ　ＬＦ送信アンテナ
　１５　入出力部
　２１　センサ制御部（制御部）
　２２　センサ用記憶部
　２３　センサ送信部（送信部）
　２３ａ　ＲＦ送信アンテナ
　２４　センサ受信部（受信部）
　２４ａ　ＬＦ受信アンテナ
　２５　空気圧検出部
　２６　温度検出部
　２７　加速度センサ
　９１　携帯側制御部
　９２　携帯側受信部
　９２ａ　携帯側ＬＦ受信アンテナ
　９３　携帯側送信部
　９３ａ　携帯側ＲＦ送信アンテナ
　９４　携帯側記憶部
　９５　受信信号強度測定部
　Ｃ　車両
  1 In-vehicle device (monitoring device)
2 Detection Device 3 Tire 4 Notification Device 5 Vehicle Speed Sensor 6 Ignition Switch 7 Positioning Device 8 Door ECU
DESCRIPTION OF SYMBOLS 9 Portable machine 11 Car-mounted control part 12 Memory | storage part 13 Car-mounted receiving part 13a RF receiving antenna 14 Car-mounted transmitting part 14a, 14b LF transmitting antenna 15 Input / output part 21 Sensor control part (control part)
22 Sensor storage unit 23 Sensor transmission unit (transmission unit)
23a RF transmission antenna 24 Sensor receiver (receiver)
24a LF reception antenna 25 air pressure detection unit 26 temperature detection unit 27 acceleration sensor 91 portable side control unit 92 portable side reception unit 92a portable side LF reception antenna 93 portable side transmission unit 93a portable side RF transmission antenna 94 portable side storage unit 95 received signal Strength measurement unit C Vehicle

Claims (8)

  1. 　要求信号を受信した場合、車両に設けられたタイヤの空気圧を検出し、検出して得た空気圧の情報を含む空気圧信号を送信する検出装置であって、
    　タイヤの空気圧の増減速度が閾値以上である場合、該空気圧に応じて所定信号を継続的に送信する送信部と、
    　前記所定信号の送信の制限を指示する制限信号を受信する受信部と、
    　該受信部にて前記制限信号を受信した場合、前記送信部による前記所定信号の送信を制限させる制御部と
    　を備える検出装置。     When a request signal is received, it is a detection device that detects the air pressure of a tire provided in a vehicle and transmits an air pressure signal including information on the air pressure obtained by the detection,
    When the increase / decrease speed of the tire air pressure is equal to or higher than the threshold, a transmission unit that continuously transmits a predetermined signal according to the air pressure;
    A receiving unit that receives a restriction signal instructing restriction of transmission of the predetermined signal;
    And a control unit configured to limit transmission of the predetermined signal by the transmission unit when the reception unit receives the restriction signal.
  2. 　前記制御部は、
    　前記受信部にて前記制限の解除を指示する解除信号を受信した場合、前記送信部による前記所定信号の制限を解除する
    　請求項１に記載の検出装置。     The controller is
    The detection device according to claim 1, wherein when the release unit receives a release signal instructing the release of the restriction, the restriction of the predetermined signal by the transmission unit is released.
  3. 　前記車両の複数のタイヤにそれぞれ設けられた請求項１又は請求項２に記載の検出装置と、
    　前記検出装置との間で無線通信を行い、各タイヤの空気圧を監視する監視装置と
    　を備えるタイヤ空気圧監視システム。     The detection device according to claim 1 or 2, provided on each of a plurality of tires of the vehicle,
    A tire pressure monitoring system comprising: a monitoring device that performs wireless communication with the detection device and monitors the pressure of each tire.
  4. 　前記監視装置は、
    　前記車両のイグニッションスイッチがオフ状態からオン状態に切り替えられてから所定時間が経過した場合、前記制限信号を送信する
    　請求項３に記載のタイヤ空気圧監視システム。     The monitoring device
    The tire pressure monitoring system according to claim 3, wherein the limit signal is transmitted when a predetermined time has elapsed since the ignition switch of the vehicle was switched from an off state to an on state.
  5. 　前記監視装置は、
    　前記車両が走行を開始した場合、前記制限の解除を指示する解除信号を送信する
    　請求項３又は請求項４に記載のタイヤ空気圧監視システム。     The monitoring device
    The tire pressure monitoring system according to claim 3 or 4, wherein when the vehicle starts running, a release signal instructing release of the restriction is transmitted.
  6. 　前記監視装置は、
    　前記車両のイグニッションスイッチがオン状態からオフ状態に切り替えられた場合、前記制限信号を送信する
    　請求項３～請求項５までのいずれか一項に記載のタイヤ空気圧監視システム。     The monitoring device
    The tire pressure monitoring system according to any one of claims 3 to 5, wherein the limit signal is transmitted when an ignition switch of the vehicle is switched from an on state to an off state.
  7. 　前記監視装置は、
    　前記車両のイグニッションスイッチがオフ状態からオン状態に切り替えられた場合、前記制限の解除を指示する解除信号を送信する
    　請求項３～請求項６までのいずれか一項に記載のタイヤ空気圧監視システム。     The monitoring device
    The tire pressure monitoring system according to any one of claims 3 to 6, wherein when the ignition switch of the vehicle is switched from an off state to an on state, a release signal instructing release of the restriction is transmitted.
  8. 　前記車両は、携帯機と無線通信を行うことによって前記車両の施解錠を行う機能を有しており、
    　前記検出装置及び前記携帯機は、重複する周波数帯の電波を用いて信号を送信する
    　請求項３～請求項７までのいずれか一項に記載のタイヤ空気圧監視システム。     The vehicle has a function of locking and unlocking the vehicle by performing wireless communication with a portable device,
    The tire pressure monitoring system according to any one of claims 3 to 7, wherein the detection device and the portable device transmit signals using radio waves in overlapping frequency bands.
PCT/JP2018/016388 2017-05-12 2018-04-23 Detection device and tire air pressure monitoring system WO2018207596A1 (en)

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JP7424249B2 (en) * 2020-08-28 2024-01-30 株式会社デンソー tire pressure monitoring system

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JP2003081059A (en) * 2001-09-13 2003-03-19 Alps Electric Co Ltd Keyless entry device serving also as tire inflation pressure monitor
JP2005157511A (en) * 2003-11-21 2005-06-16 Toyota Motor Corp Vehicular information processing system and wheel information processing system
JP2007076457A (en) * 2005-09-13 2007-03-29 Denso Corp Tire pneumatic pressure detection device
JP2012101707A (en) * 2010-11-11 2012-05-31 Tokai Rika Co Ltd Onboard communication instrument
JP2013043535A (en) * 2011-08-24 2013-03-04 Honda Motor Co Ltd In-vehicle device of vehicle with smart key system and tire air pressure monitoring system

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