JP6193199B2 - Tire condition monitoring device - Google Patents

Description

  The present invention relates to a tire condition monitoring device for monitoring the condition of a tire.

  A plurality of wheels having tires mounted on a wheel portion are provided in a vehicle, and a wireless tire state monitoring device has been proposed as a device that can monitor the state of the tire. This tire condition monitoring device includes a tire sensor unit (wheel side unit) provided in a tire of each wheel of the vehicle, and a receiver (receiver unit) provided on the vehicle body of the vehicle. The tire sensor unit for each wheel is configured to include a transmitter, and wirelessly transmits a transmission signal related to the detected tire state. And a receiver displays the information regarding the state of a tire as needed on the indicator provided in the vehicle interior based on the transmission signal from each transmitter.

  In such a tire condition monitoring device, for example, as shown in Patent Document 1, in the tire sensor unit, a plurality of types of programs for performing communication are stored in advance, and any of the plurality of types of programs is executed. By switching whether or not to perform the communication, there is disclosed a device capable of realizing communication by a plurality of types of communication methods. For example, when the receiver uses a signal in the low frequency band, a communication method for transmitting the signal in the low frequency band is set, and when the receiver uses a signal in the high frequency band, the signal in the high frequency band is The communication method to be transmitted is set.

JP 2012-96764 A

  By the way, in such a tire condition monitoring device, there is a device capable of updating the program in the tire sensor unit by communicating with, for example, a trigger device capable of transmitting a signal for controlling the tire sensor unit. However, if a signal in a high frequency band is used to speed up the program update, power consumption increases in a standby state in which the high frequency band signal is awaited, and power consumption in the tire condition monitoring device increases. There was a fear.

  This invention was made paying attention to the problem which exists in such a prior art, and the objective is to provide the tire condition monitoring apparatus which can suppress power consumption.

  A tire condition monitoring device that solves the above problems is a tire condition monitoring device for monitoring a condition in a tire provided in a vehicle including a wheel with a tire mounted on a wheel portion, and can receive a signal, A first receiving unit controlled in a standby state for waiting for the signal; and a high-frequency signal in a higher frequency band than the signal receivable by the first receiving unit is received; A second receiving unit controlled to a standby state for waiting for the high-frequency signal with high power consumption, and a control unit that controls the first receiving unit and the second receiving unit, the control unit comprising: In a normal state, the first receiving unit is controlled to be in a standby state, and the second receiving unit is controlled to be in a dormant state in which the high-frequency signal is not received to indicate that a program update is started. When the start signal is received by said first receiver, and summarized in that for controlling the second reception unit so as to be received to the standby state program update signal for updating the program.

  According to this, in a normal time, the second receiving unit is controlled to be in a dormant state, and when the first receiving unit receives a program update start signal, the second receiving unit can receive a program update signal for program update. It is controlled to the standby state. For this reason, the second receiving unit can be updated to a standby state with a higher power consumption than the first receiving unit, while the second receiving unit can be in a standby state to update a program using a high-frequency signal. Can be controlled in a dormant state until a program update start signal is input, and power consumption can be suppressed.

  In the tire condition monitoring device, the control unit may control the second receiving unit to a resting state when an end condition is satisfied when the second receiving unit is controlled to be in a standby state.

According to this, when the end condition is satisfied when the second receiving unit is controlled to the standby state, the second receiving unit can be controlled to be in a dormant state, and power consumption can be suppressed.
About the said tire condition monitoring apparatus, the said completion | finish condition is good also as a structure containing that the update of the program received by the said 2nd receiving part was complete | finished.

According to this, when the update of the program is completed, the second receiving unit can be controlled from the standby state to the dormant state, and power consumption can be suppressed.
In the tire condition monitoring apparatus, the termination condition may include a configuration in which the program update signal is not received by the second reception unit for a predetermined time.

  According to this, for example, when a communication abnormality occurs and the program update signal is not received for a predetermined time, the second receiving unit can be controlled from the standby state to the sleep state, and power consumption can be reduced. Can be suppressed.

  According to the present invention, power consumption can be suppressed.

The schematic block diagram which shows the vehicle by which the tire condition monitoring apparatus of embodiment is mounted. The figure which shows the circuit structure of a tire sensor unit. The flowchart which shows a communication initial setting process. The flowchart which shows a program update related process. (A)-(c) is a figure which shows the communication aspect in each communication system.

Hereinafter, an embodiment in which the tire condition monitoring device is embodied will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the vehicle 10 is equipped with a tire condition monitoring device 30. The four wheels 1 to 4 of the vehicle 10 are composed of a wheel portion 5 and a tire 6 attached to the wheel portion 5.

  The tire condition monitoring device 30 includes a tire sensor unit 13 that is attached to each of the four wheels 1 to 4 of the vehicle 10, and a receiver unit 31 that is installed on the vehicle body of the vehicle 10.

  The wheel unit 5 is provided with a tire sensor unit 13 integrally with the tire valve. The tire sensor unit 13 detects a state of the tire 6 such as an air pressure (tire pressure) and temperature (in-tire temperature) in the tire 6 and wirelessly transmits a transmission signal (detection result information) regarding the detection result.

  Further, the tire sensor unit 13 performs various transmissions such as wireless transmission of a transmission signal related to the state of the tire 6, setting change of the tire sensor unit 13, update of a program of the tire sensor unit 13 in accordance with various trigger signals from the trigger device 50. Execute the process.

  As shown in FIG. 2, each tire sensor unit 13 includes a sensor unit controller 14, a pressure sensor 15, a temperature sensor 16, an LF communication circuit 17, an RF communication circuit 18, and a battery 20. The tire sensor unit 13 operates by supplying power from the battery 20.

The pressure sensor 15 detects the corresponding tire pressure. The temperature sensor 16 detects a corresponding tire internal temperature.
The LF communication circuit 17 is a circuit that transmits and receives signals using radio waves in a predetermined frequency band (135 kHz in the present embodiment). In particular, the LF communication circuit 17 is a signal that requests the state of the tire 6 and the tire sensor unit 13. It is a circuit that receives a signal relating to a setting change.

  The RF communication circuit 18 is a circuit that transmits and receives signals using radio waves in a predetermined frequency band (in this embodiment, 2.4 GHz), and in particular, signals based on detection results from the pressure sensor 15 and the temperature sensor 16. A circuit for transmitting (outputting). The RF communication circuit 18 transmits and receives a high-frequency signal in a higher frequency band than the LF communication circuit 17, and is controlled to a standby state with high power consumption. In the present embodiment, the RF communication circuit 18 can be controlled to a standby state in which a signal is awaited and a pause state in which a signal is not awaited. In the tire sensor unit 13, radio waves from the LF communication circuit 17 and the RF communication circuit 18 are transmitted and received via various antennas, but are not shown in the figure.

  As described above, the tire sensor unit 13 uses two types of communication methods capable of transmitting and receiving radio waves in a predetermined frequency band. In the present embodiment, the LF communication circuit 17 constitutes a first receiving unit, and the RF communication circuit 18 constitutes a second receiving unit.

  The sensor unit controller 14 includes a microcomputer including a CPU 14a and a storage unit 14b (RAM, ROM, etc.). The storage unit 14b of the sensor unit controller 14 stores a program for comprehensively controlling the operation of the tire sensor unit 13 and various set values.

  The sensor unit controller 14 receives detection signals from the pressure sensor 15 at predetermined intervals, and stores pressure data based on these detection signals in the storage unit 14b. The sensor unit controller 14 receives detection signals from the temperature sensor 16 at predetermined intervals, and stores temperature data based on the detection signals in the storage unit 14b.

  A threshold for comparison with the pressure data detected by the pressure sensor 15 is stored in the storage unit 14b of the sensor unit controller 14 in advance. The threshold value is information unique to the tire 6 and is set with a margin more than the pressure data detected when the tire air pressure enclosed by the wheel portion 5 and the tire 6 becomes excessively low. When the pressure data detected by the pressure sensor 15 exceeds the threshold value, the sensor unit controller 14 generates a transmission signal indicating abnormality and causes the RF communication circuit 18 to transmit the transmission signal.

  In addition, a threshold for comparison with temperature data detected by the temperature sensor 16 is stored in the storage unit 14b of the sensor unit controller 14 in advance. The threshold value is information unique to the tire 6 and is set with a margin more than temperature data detected when the temperature inside the tire enclosed by the wheel portion 5 and the tire 6 becomes excessively high. When the temperature data detected by the temperature sensor 16 exceeds the threshold value, the sensor unit controller 14 generates a transmission signal indicating an abnormality and causes the RF communication circuit 18 to transmit it.

  On the other hand, when the pressure data detected by the pressure sensor 15 does not exceed the threshold value and the temperature data detected by the temperature sensor 16 does not exceed the threshold value, the sensor unit controller 14 transmits an abnormality. Do not generate a signal.

  In the present embodiment, the sensor unit controller 14 is configured to perform predetermined times (for example, four times) even when the pressure data detected by the pressure sensor 15 or the temperature data detected by the temperature sensor 16 does not exceed the threshold value. ) Causes the RF communication circuit 18 to transmit a normal transmission signal. Therefore, in this embodiment, the sensor unit controller 14 constitutes a control unit that performs control for monitoring (determining) the state of the tire 6 such as the tire air pressure and the tire internal temperature.

  In the present embodiment, when the LF communication circuit 17 receives the state request signal from the trigger device 50, the sensor unit controller 14 sends a signal related to the state of the tire 6 stored in the storage unit 14 b from the LF communication circuit 17. The trigger device 50 is transmitted. When the LF communication circuit 17 receives the setting change signal from the trigger device 50, the sensor unit controller 14 changes the setting value stored in the storage unit 14b. Further, when the LF communication circuit 17 and the RF communication circuit 18 receive a signal related to program update from the trigger device 50, the sensor unit controller 14 updates the program stored in the storage unit 14b.

  The trigger device 50 includes an operation unit 51 that can be operated by a user, an LF communication circuit 52, an RF communication circuit 53, a display unit 54 that can display a predetermined image, and a trigger controller 55. The LF communication circuit 52 can transmit and receive signals to and from the LF communication circuit 17 of the tire sensor unit 13, and the RF communication circuit 53 can transmit and receive signals to and from the RF communication circuit 18 of the tire sensor unit 13. In the trigger device 50, radio waves from the LF communication circuit 52 and the RF communication circuit 53 are transmitted and received via various antennas, but are not shown in the drawing.

  The trigger controller 55 includes a microcomputer including a CPU 55a and a storage unit 55b (RAM, ROM, etc.). A program for comprehensively controlling the operation of the trigger device 50 is stored in the storage unit 55b of the trigger controller 55. Further, a program for updating the program of the tire sensor unit 13 can be stored.

  When the trigger controller 55 transmits a state request signal from the LF communication circuit 52 in response to an operation of the operation unit 51 and receives a signal related to the state of the tire 6 from the tire sensor unit 13, the trigger controller 55 receives the signal about the tire 6 based on the signal. Information about the state is displayed on the display unit 54. Further, the trigger controller 55 transmits a setting change signal from the LF communication circuit 52 according to the operation of the operation unit 51, and causes the tire sensor unit 13 to change the setting. In addition, the trigger controller 55 causes the tire sensor unit 13 to update the program by causing the LF communication circuit 52 and the RF communication circuit 53 to transmit a signal related to program update in accordance with the operation of the operation unit 51.

  As shown in FIG. 1, the receiver unit 31 as a receiver includes a receiver unit controller 33 and an RF receiving circuit 35. A display unit 38 is connected to the receiver unit controller 33 of the receiver unit 31. The receiver unit controller 33 is composed of a microcomputer including a CPU and a storage unit (ROM, RAM, etc.), and a program for comprehensively controlling the operation of the receiver unit 31 is stored in the storage unit. The RF reception circuit 35 demodulates the RF signal (transmission signal) received from each tire sensor unit 13 through the RF reception antenna 32 and sends it to the receiver unit controller 33.

  The receiver unit controller 33, based on the RF signal from the RF receiving circuit 35, when the data relating to the state of the tire 6 (tire pressure or temperature in the tire) corresponding to the tire sensor unit 13 as the transmission source exceeds a threshold value. Information on the state of the tire 6 is displayed on the display 38. The indicator 38 is disposed in the visible range of the passenger of the vehicle 10 such as in the passenger compartment, and displays (notifies) an abnormality in the state of the tire 6 specified by the receiver unit controller 33.

Here, the program update control in the tire sensor unit 13 will be described in detail with reference to FIGS. 3 and 4.
In the tire sensor unit 13, when power is turned on, communication initial setting processing related to communication in the LF communication circuit 17 and the RF communication circuit 18 is executed.

  As shown in FIG. 3, in the communication initial setting process, the sensor unit controller 14 performs various initial setting processes for performing communication (step S11). The sensor unit controller 14 controls the LF communication circuit 17 to the standby state (step S12), controls the RF communication circuit 18 to the sleep state (step S13), and ends the communication initial setting process. As a result, the sensor unit controller 14 controls the LF communication circuit 17 to be in a standby state during normal times such as when no transmission signal is transmitted to the receiver unit 31 or when a program is not updated. The communication circuit 18 is controlled to be in a dormant state.

In the tire sensor unit 13, when the communication initial setting process ends, normal control is performed, and the program update related process is executed at a predetermined cycle.
As shown in FIG. 4, in the program update related processing, the sensor unit controller 14 determines whether or not a program update start signal is received by the LF communication circuit 17 (step S21). This program update start signal is a signal transmitted from the trigger device 50 in response to an update operation of the operation unit 51.

  If it is determined that the sensor unit controller 14 has not received the program update start signal, the process proceeds to step S23 without executing step S22. On the other hand, if it is determined that the program unit update start signal has been received, the sensor unit controller 14 controls the RF communication circuit 18 to a standby state (step S22), and a preparation completion signal indicating that the program update preparation has been completed. Is transmitted from the LF communication circuit 17. This preparation completion signal is a signal that can be received by the LF communication circuit 52 of the trigger device 50.

  In the trigger device 50, when the trigger controller 55 receives a preparation completion signal after a predetermined time elapses after transmitting a program update start signal, the trigger controller 55 transmits a program update signal for updating the program by RF communication. Transmit from the circuit 53. This program update signal is a signal indicating the program itself to be updated.

  In the tire sensor unit 13, the sensor unit controller 14 determines whether or not the RF communication circuit 18 is in a standby state and the RF communication circuit 18 has received a program update signal (step S23). If it is determined that the program unit update signal has not been received, the sensor unit controller 14 proceeds to step S25 without executing step S24. On the other hand, when it is determined that the RF communication circuit 18 is in the standby state and the program update signal has been received, the sensor unit controller 14 executes a program update process for updating the program of the tire sensor unit 13 (step S24). . In the present embodiment, the sensor unit controller 14 stores data specified by the received program update signal in the storage unit 14b, and updates all the programs collectively after all the program update signals are received. To control.

  Next, the sensor unit controller 14 determines whether or not the RF communication circuit 18 is in a standby state and an end condition for program update is satisfied (step S25). If it is determined that the end condition for program update is not satisfied, the sensor unit controller 14 ends the program update related processing without executing step S26. On the other hand, if it is determined that the termination condition for the program update is satisfied, the sensor unit controller 14 terminates the program update and controls the RF communication circuit 18 to the sleep state (step S26). The process ends.

  In the present embodiment, the end condition includes a plurality of types of conditions, and when at least one of the plurality of types of conditions is satisfied, it is determined as affirmative in step S25.

  The termination condition includes a case where all program update signals are received. The last program update signal includes information that can be identified as the last program update signal, and the sensor unit controller 14 determines whether or not it is the last program update signal based on the information. And determine whether an end condition is satisfied.

  The termination condition includes a case where the next program update signal is not received even if a predetermined time-out period elapses after the program update signal is received. When the sensor unit controller 14 receives the program update signal, the sensor unit controller 14 sets a timeout time in the timeout counter assigned to the storage unit 14b, and updates the timeout counter as time elapses to determine whether the timeout time has elapsed. And whether or not the end condition is satisfied is determined.

  The termination condition includes a case where a program update stop signal for stopping program update is received from the LF communication circuit 17. This program update stop signal is a signal transmitted from the LF communication circuit 52 in response to the operation of the operation unit 51 in the trigger device 50. The sensor unit controller 14 determines whether a program update stop signal is received from the LF communication circuit 17 and determines whether an end condition is satisfied.

  In the present embodiment, the program update signal is a signal (data) having a larger size than the program update start signal, the preparation completion signal, the program update stop signal, the status request signal, and the setting change signal.

Next, the operation of the tire condition monitoring device of this embodiment will be described.
In the present embodiment, during normal times, the LF communication circuit 17 is controlled to be in a standby state, and the RF communication circuit 18 is controlled to be in a sleep state. When the LF communication circuit 17 receives the program update start signal, the RF communication circuit 18 is controlled to be in a standby state, and the RF communication circuit 18 can receive the program update signal. When the program update signal is received from the RF communication circuit 18, the program of the tire sensor unit 13 is updated based on the program update signal. And if the completion | finish condition about the update of the program of the tire sensor unit 13 is satisfied, the RF communication circuit 18 will be controlled to a dormant state.

  As a specific example, as shown in FIG. 5 (a), when the tire sensor unit 13 is powered on, the LF communication circuit 17 is controlled to a standby state at the timing indicated by reference numeral T10, and RF communication is performed. The circuit 18 is controlled to the sleep state. When the program update start signal transmitted from the trigger device 50 is received by the LF communication circuit 17 at the timing indicated by T11, the RF communication circuit 18 is controlled to be in a standby state at the timing indicated by T12. . Thereafter, the program update signal transmitted from the trigger device 50 is received by the RF communication circuit 18 from the timing indicated by reference numeral T13. Then, when the reception of the program update signal is completed at the timing indicated by reference symbol T14, the termination condition is satisfied, and the RF communication circuit 18 is controlled to be in a dormant state at the timing indicated by reference symbol T15.

  Further, as shown in FIG. 5B, when the next program update signal is not received after the program update signal is received by the RF communication circuit 18 at the timing indicated by T16, the timeout time t0 has elapsed. Then, the termination condition is satisfied, and the RF communication circuit 18 is controlled to be in a dormant state at the timing indicated by the symbol T17.

  Further, as shown in FIG. 5C, when the program update signal is received, and the program update stop signal is received by the LF communication circuit 17 at the timing indicated by T18, the termination condition is satisfied. Thus, the RF communication circuit 18 is controlled to be in a dormant state at the timing indicated by the symbol T19.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) In a normal state, the RF communication circuit 18 is controlled to be in a dormant state. When the LF communication circuit 17 receives a program update start signal, the RF communication circuit 18 waits so that a program update signal for updating the program can be received. Controlled to a receiving state. Therefore, it is possible to update the program using the high-frequency signal by setting the RF communication circuit 18 in the standby state, and the RF communication circuit 18 controlled to the standby state with high power consumption is supplied with the program update start signal. Can be controlled in a sleep state until power is input, and power consumption can be suppressed.

  (2) When the end condition is satisfied when the RF communication circuit 18 is controlled to be in the standby state, the RF communication circuit 18 can be controlled to be in a dormant state, and power consumption can be suppressed.

(3) When the program update is completed, the RF communication circuit 18 can be controlled from the standby state to the hibernation state, and power consumption can be suppressed.
(4) For example, when a communication abnormality occurs and the program update signal is not received for a predetermined time, the RF communication circuit 18 can be controlled from the standby state to the hibernation state, thereby reducing power consumption. be able to.

  (5) When a program update stop signal indicating that program update is to be stopped is received, the RF communication circuit 18 can be controlled from a standby state to a sleep state, and power consumption can be suppressed. .

  (6) Even if a program update start signal for starting program update is received by the LF communication circuit 17, the LF communication circuit 17 is continuously controlled in the standby state. Even in such a case, communication in the LF communication circuit 17 such as a program update stop signal becomes possible.

In addition, you may change embodiment as follows.
The tire sensor unit 13 does not need to transmit a preparation completion signal to the trigger device 50, and after the time sufficient for controlling the RF communication circuit 18 in the standby state in the tire sensor unit 13 has elapsed, the trigger device 50 May be configured to transmit a program update signal.

  A reception completion signal indicating that the reception of the program update signal has been completed from the tire sensor unit 13 to the trigger device 50 may be transmitted from the LF communication circuit 17 or the RF communication circuit 18 to the trigger device 50, and the reception completion signal is transmitted. The RF communication circuit 18 may be controlled to be in a sleep state before and after the operation.

In the tire sensor unit 13, a program update end signal indicating that the program update itself has ended may be transmitted from the LF communication circuit 17 or the RF communication circuit 18.
For example, the program update itself may be started even if reception of all program update signals is not completed.

  -It is not limited to the termination condition in the said embodiment, At least any of termination conditions may be prescribed | regulated. Further, for example, another end condition may be defined when a predetermined time has elapsed since the program update start signal was received, and there is no problem even if the end condition is not defined.

In the tire sensor unit 13, at least one of the LF communication circuit 17 and the RF communication circuit 18 may not have a transmission function.
The tire sensor unit 13 is not limited to the frequency bands of signals used in a plurality of types of communication methods, but has a low frequency signal in a low frequency band and a high frequency band that can be standby with higher power consumption than the low frequency signal. What is necessary is just to be able to transmit a high frequency signal.

  The signal transmitted from the tire sensor unit 13 to the receiver unit 31 may be a signal transmitted from the LF communication circuit 17 instead of the RF communication circuit 18 or a combination thereof.

  For example, the RF communication circuit 18 may be controlled to be in a dormant state other than when the transmission signal is not transmitted from the tire sensor unit 13 to the receiver unit 31 or when the program is not updated. Further, when the signal is transmitted from the LF communication circuit 17 to the receiver unit 31, the RF communication circuit 18 is in the sleep state even when the transmission signal is transmitted from the tire sensor unit 13 to the receiver unit 31. May be controlled. That is, it is only necessary to be able to control the hibernation state at least during normal times when the program is not updated, and it is only necessary to control the standby state when starting the program update.

  When the tire sensor unit 13 receives a program update start signal, when the RF communication circuit 18 is controlled to be in a standby state, it is not determined whether or not the RF communication circuit 18 is in a dormant state May be. Further, when the RF communication circuit 18 is controlled to be in a dormant state when the end condition is satisfied, it may or may not be determined whether or not the RF communication circuit 18 is in a standby state.

The LF communication circuit 17 may be controlled to be in a sleep state when a predetermined condition is satisfied, for example, when a program update signal is received from the RF communication circuit 18.
-When the tire pressure drops below the threshold value, it is determined that the tire pressure is abnormal. However, the present invention is not limited to this. For example, when the change amount of the tire pressure is larger than the threshold value, the tire pressure is abnormal. It may be determined, or a combination of these may be used.

  -When the temperature inside the tire rises above the threshold, it is determined that the temperature inside the tire is abnormal. However, the present invention is not limited to this. For example, when the amount of change in the temperature inside the tire is larger than the threshold, It may be determined that it is abnormal, or a combination of these may be used.

  Any one of the tire air pressure and the tire internal temperature may be detected as the state of the tire 6, and other than the tire air pressure and the tire internal temperature may be detected. For example, the wear signal of the tire 6, abnormal vibration, abnormality of the sensor unit controller 14 itself, abnormality of the pressure sensor 15 itself, abnormality of the temperature sensor 16 itself, voltage drop of the battery 20, etc. may be detected and a transmission signal may be transmitted. A combination of these may also be used.

  The tire sensor unit 13 may not determine whether the state of the tire 6 is normal or abnormal. That is, the tire sensor unit 13 may detect the state of the tire 6 and output a signal related to the detection result.

  For example, the tire sensor unit 13 may be attached to the inner peripheral surface of the tread portion of the tire 6. As a result, the identification information unique to the tire 6 is stored, so that, for example, it is possible to save the trouble of inputting the identification information unique to the tire 6 when changing the combination of the wheel portion 5 and the tire 6. Can be improved.

  The tire sensor unit 13 may be disposed on each of the wheels 1 to 4, and the tire condition monitoring device may be disposed on the vehicle 10 including the wheels 1 to 4 and the vehicle body. In other words, the tire condition monitoring device may include the tire sensor unit 13 disposed on each of the wheels 1 to 4 without including the receiver unit 31.

  The communication target of the RF communication circuit 18 may not be the receiver unit 31 or the trigger device 50 mounted on the vehicle body of the vehicle 10, but may be equipment such as a portable terminal or a roadway. That is, the tire state monitoring device may be configured to include at least the tire sensor unit 13. Moreover, about the signal regarding the update of the program in the tire sensor unit 13, you may implement | achieve by not only communication with the trigger apparatus 50 but communication with the receiver unit 31, a portable terminal device, etc., for example.

  The tire condition monitoring device 30 is not limited to the application to the tire 6 in the four-wheel vehicle 10, and may be applied to a tire in a vehicle other than four wheels such as 1 to 3 wheels, 5 wheels or more.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) The termination condition includes that a program update stop signal indicating that the update of the program is stopped is received by the first receiving unit or the second receiving unit.

  (B) The control unit continues to control the first reception unit in a standby state even when a program update start signal for starting program update is received by the first reception unit. .

  DESCRIPTION OF SYMBOLS 1-4 ... Wheel, 5 ... Wheel part, 6 ... Tire, 10 ... Vehicle, 13 ... Tire sensor unit, 14 ... Sensor unit controller, 15 ... Pressure sensor, 16 ... Temperature sensor, 17 ... LF communication circuit, 18 ... RF Communication circuit 20 ... Battery 30 ... Tire condition monitoring device 33 ... Receiver unit controller 35 ... RF receiving circuit 50 ... Trigger device 51 ... Operation unit 52 ... LF communication circuit 53 ... RF communication circuit 54 ... display section, 55 ... trigger controller.

Claims (4)

A tire condition monitoring device for monitoring a condition in a tire provided in a vehicle including a wheel having a tire mounted on a wheel part,
A first receiving unit capable of receiving a signal and controlled to a standby state for waiting for the signal;
The first receiving unit is capable of receiving a high-frequency signal in a higher frequency band than the signal receivable by the first receiving unit, and is controlled to a standby state in which the high-frequency signal is awaited with higher power consumption than the first receiving unit. Two receivers;
A control unit that controls the first receiving unit and the second receiving unit,
The controller is
In a normal time, the first receiving unit is controlled to be in a standby state, and the second receiving unit is controlled to be in a dormant state where the high frequency signal is not received.
When a program update start signal indicating start of program update is received by the first receiver, the second receiver is controlled to be in a standby state so that a program update signal for updating the program can be received. Tire condition monitoring device.   The tire state monitoring device according to claim 1, wherein the control unit controls the second receiving unit to a resting state when an end condition is satisfied when the second receiving unit is controlled to be in a standby state.   The tire condition monitoring apparatus according to claim 2, wherein the end condition includes that the update of the program received by the second receiving unit has ended.   The tire condition monitoring device according to claim 2 or 3, wherein the end condition includes that the program update signal is not received for a predetermined time by the second reception unit.