WO2017046923A1 - タイヤ状態検出装置 - Google Patents
タイヤ状態検出装置 Download PDFInfo
- Publication number
- WO2017046923A1 WO2017046923A1 PCT/JP2015/076550 JP2015076550W WO2017046923A1 WO 2017046923 A1 WO2017046923 A1 WO 2017046923A1 JP 2015076550 W JP2015076550 W JP 2015076550W WO 2017046923 A1 WO2017046923 A1 WO 2017046923A1
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- WIPO (PCT)
- Prior art keywords
- tire
- unit
- mode
- valve stem
- detection device
- Prior art date
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Classifications
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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
- 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
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0435—Vehicle body mounted circuits, e.g. transceiver or antenna fixed to central console, door, roof, mirror or fender
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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
- 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
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0454—Means for changing operation mode, e.g. sleep mode, factory mode or energy save mode
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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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/24—Wear-indicating arrangements
- B60C11/243—Tread wear sensors, e.g. electronic sensors
-
- 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
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0435—Vehicle body mounted circuits, e.g. transceiver or antenna fixed to central console, door, roof, mirror or fender
- B60C23/0445—Means for changing operating mode, e.g. sleep mode, factory mode or energy saving mode
-
- 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
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0455—Transmission control of wireless signals
- B60C23/0459—Transmission control of wireless signals self triggered by motion sensor
-
- 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
- B60C23/0491—Constructional details of means for attaching the control device
- B60C23/0494—Valve stem attachments positioned inside the tyre chamber
-
- 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
- B60C23/0491—Constructional details of means for attaching the control device
- B60C23/0496—Valve stem attachments positioned outside of the tyre chamber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a tire condition detection device that detects the condition of a wheel tire.
- a plurality of wheels having tires mounted on a wheel portion are provided in a vehicle, and a wireless tire state detection device has been proposed as a device that can detect the state of each tire.
- the tire state detection device is provided in the tire of each wheel of the vehicle, detects the tire state, and wirelessly transmits a signal related to the detected tire state. Each signal is received by the receiver, and information on the state of the corresponding tire is displayed on a display provided in the vehicle interior as necessary.
- the tire condition detection device incorporates a battery for supplying electric power because the tire condition detection device is attached to the wheel.
- the tire condition detection device disclosed in Patent Document 1 can receive a radio signal from an external device such as a portable terminal.
- an external device such as a portable terminal.
- the tire condition detection device is received from an external device.
- a signal related to the tire condition is transmitted.
- An object of the present invention is to provide a tire state detection device capable of reducing power consumption.
- a tire condition detection device that solves the above problem is a tire condition detection device that is attached to a valve stem of a wheel so as to be disposed in a tire of a vehicle wheel, and is configured to detect the condition of the tire.
- a state detection unit a transmission unit configured to wirelessly transmit a signal including information detected by the state detection unit, a reception unit capable of receiving a signal wirelessly transmitted from an external device, and the transmission
- a control unit configured to control the receiving unit, a characteristic detection unit configured to detect an electrical characteristic of the valve stem, and a battery serving as a power source of the tire condition detection device
- the control unit includes a normal mode for maintaining the reception unit in a standby state capable of receiving a wireless transmission signal from the external device, and reception of a wireless transmission signal from the external device.
- the control unit is configured to operate in a control mode selected from a power saving mode that consumes less power than the normal mode, and the control unit detects a change amount of an electrical characteristic of the valve stem detected by the characteristic detection unit. Is switched to the normal mode, and the control mode is switched to the power saving mode when an end condition is satisfied in the normal mode.
- the control mode is switched to the power saving mode in which the power consumption is lower than that in the normal mode for the reception of the wireless transmission signal from the external device. Power consumption for reception of a wireless transmission signal can be reduced.
- the said characteristic detection part may be comprised so that the electrostatic capacitance in the said valve stem may be detected. According to this, when an operator touches the valve stem after the tire has been replaced, the control mode is normally set in response to the change in the valve stem capacitance exceeding the reference change. Switch to mode.
- the said receiving part may be comprised so that the signal of the frequency band of an ultra high frequency can be received.
- the power consumption for receiving the signal is larger than in the case of receiving the signal in the ultra-high frequency band, but the control mode is the normal mode.
- the end condition is that a wireless transmission signal is received from the external device by the receiving unit, and a predetermined time has elapsed since the control mode is switched to the normal mode. And at least one of detecting that the vehicle has traveled may be satisfied.
- the radio transmission signal from the external device can be received, and the control unit can be switched from the normal mode to the power saving mode by receiving the radio transmission signal from the external device. Power consumption can be reduced for reception of a wireless transmission signal from an external device.
- control mode when a predetermined time has elapsed since the control mode was switched to the normal mode, the control mode can be switched from the normal mode to the power saving mode, and the frequency with which the receiver enters a standby state is reduced. Power consumption for receiving a wireless transmission signal from an external device can be reduced.
- the receiving unit when the vehicle is detected to travel, the frequency at which the receiving unit receives the wireless transmission signal from the external device tends to be lower than when the vehicle is stopped. For this reason, when it is detected that the vehicle, which is in a situation where the frequency of receiving the wireless transmission signal from the external device is low, is running, the receiving unit is switched by switching the control mode from the normal mode to the power saving mode. The frequency of entering a standby state can also be reduced, and the power consumption for receiving a wireless transmission signal from an external device can be reduced.
- the said control part may be comprised so that the process which specifies the variation
- the control unit executes a process of specifying a change amount of an electrical characteristic of the valve stem when the vehicle is stopped, and the valve when the vehicle is running It may be configured not to execute the process of specifying the change amount of the electrical characteristic of the stem.
- the power consumption of the tire condition detection device can be reduced.
- the schematic block diagram which shows the vehicle by which the sensor unit of one Embodiment was mounted.
- the perspective view which shows the state with which the tire valve of the embodiment was mounted
- the perspective view which shows the tire valve and sensor unit of the embodiment.
- the block diagram which shows the electrical constitution of the sensor unit of the embodiment.
- the flowchart which shows the mode control process of the embodiment.
- Each wheel 13 includes a vehicle wheel 14 and a tire 15 attached to the vehicle wheel 14.
- the tire condition monitoring device 30 includes a sensor unit 31 attached to each wheel 13 and a receiver unit 60 installed on the vehicle body of the vehicle 10. As shown in FIG. 2, the sensor unit 31 is attached to the tire valve 17 attached to the rim 16 of the vehicle wheel 14 and integrated with the tire valve 17, and the tire attached to the vehicle wheel 14. 15 is arranged.
- the tire valve 17 includes a valve stem 18 that is formed into a cylindrical shape from a metal material, and a rubber body 19 that is attached to the outer peripheral surface of the valve stem 18.
- An introduction path (not shown) is formed in the valve stem 18.
- a valve mechanism (not shown) is built in the distal end side of the valve stem 18, and a cap 20 is attached to the distal end of the valve stem 18.
- a pressure sensor 42 and a capacitance sensor 45 In the housing 32 of the sensor unit 31, various electronic components such as a pressure sensor 42 and a capacitance sensor 45, a battery, an antenna, and the like are accommodated.
- the pressure sensor 42 detects the pressure of the tire 15, and the capacitance sensor 45 is electrically connected to the tire valve 17 in order to detect the capacitance of the tire valve 17.
- each sensor unit 31 includes a sensor unit controller 41, a pressure sensor 42, a temperature sensor 43, an acceleration sensor 44, a capacitance sensor 45, an RF communication circuit 46, an RF communication antenna 47, and a battery 48. Is provided.
- the sensor unit 31 operates by supplying power from the battery 48.
- the pressure sensor 42 as a state detection unit detects the air pressure in the tire 15.
- the temperature sensor 43 as a state detection unit detects the temperature in the tire 15. That is, the pressure sensor 42 and the temperature sensor 43 detect the state of the tire 15.
- the acceleration sensor 44 rotates integrally with the wheel 13 to detect acceleration acting on the acceleration sensor 44.
- the capacitance sensor 45 as a characteristic detection unit detects the capacitance of the valve stem 18 of the tire valve 17 in the wheel 13.
- the RF communication circuit 46 serving as a transmission unit and a reception unit is a circuit that transmits and receives signals through the RF communication antenna 47 using radio waves in a very high frequency band (in this embodiment, 2.4 GHz).
- the RF communication circuit 46 is in a standby state in which a signal (trigger signal) wirelessly transmitted from an external device (for example, the receiver unit 60 or a trigger signal transmitter portable by an operator) can be received; A signal wirelessly transmitted from an external device can be set to a dormant state where reception is impossible.
- a signal trigger signal
- an external device for example, the receiver unit 60 or a trigger signal transmitter portable by an operator
- the sensor unit controller 41 is a control circuit or processor including a CPU 41a, a storage unit 41b (RAM, ROM, etc.), a microcomputer including an input / output port, and the like.
- the storage unit 41b of the sensor unit controller 41 stores a program that comprehensively controls the operation of the sensor unit 31.
- An ID code that is identification information unique to each sensor unit 31 is registered in the storage unit 41b. This ID code is information used to identify each sensor unit 31 in the receiver unit 60.
- the sensor unit controller 41 functions as a control unit.
- the sensor unit controller 41 determines in advance the tire air pressure detected by the pressure sensor 42, the in-tire temperature detected by the temperature sensor 43, and the acceleration (gravity acceleration) detected by the acceleration sensor 44. Acquire at the acquisition frequency.
- the sensor unit 31 including the sensor unit controller 41, the pressure sensor 42, and the temperature sensor 43 functions as a tire state detection device attached to the valve stem 18 so as to be disposed in the tire 15.
- the sensor unit controller 41 can specify the acceleration acting on the sensor unit 31, specifically the acceleration sensor 44, based on the acceleration signal from the acceleration sensor 44.
- the sensor unit controller 41 determines whether the vehicle 10 is stopped or traveling based on the acceleration signal from the acceleration sensor 44. For example, the sensor unit controller 41 determines that the vehicle 10 is traveling when the acceleration detected by the acceleration sensor 44 changes within a predetermined range (for example, a range of ⁇ 1G to + 1G).
- the sensor unit controller 41 outputs transmission data including tire pressure data, tire temperature data, and an ID code to the RF communication circuit 46 when a predetermined output condition is satisfied.
- the RF communication circuit 46 modulates transmission data output from the sensor unit controller 41 to generate a transmission signal, and wirelessly transmits the transmission signal from the RF communication antenna 47.
- the output condition is satisfied every time a predetermined time elapses. That is, the sensor unit controller 41 performs a transmission operation every time a predetermined time elapses.
- the output condition may further include that the tire air pressure or the tire internal temperature is determined to be abnormal.
- the tire unit valve 41 When the sensor unit controller 41 determines that the vehicle 10 is stopped and determines that the RF communication circuit 46 is controlled to be in a resting state, the tire unit valve 41 is based on a signal from the capacitance sensor 45. The capacitance of the seventeen valve stems 18 is specified, and capacitance data indicating the specified capacitance is stored in the storage unit 41b. In the present embodiment, the sensor unit controller 41 executes a series of processes for specifying the capacitance and storing the capacitance data in about 1 ms every predetermined period (for example, 1 s).
- the sensor unit controller 41 determines whether or not the amount of change in the capacitance of the identified valve stem 18 exceeds a predetermined reference change amount. Since the operator touches the valve stem 18 of the tire valve 17 when the tire 15 is replaced, the reference change amount is defined as a change amount of the capacitance that can be estimated that the operator has touched the valve stem 18. Yes.
- the sensor unit controller 41 determines that the vehicle 10 is traveling, or when it is determined that the RF communication circuit 46 is controlled to be in a standby state, the sensor unit controller 41 performs a process of specifying the capacitance of the valve stem 18. do not do.
- the receiver unit 60 includes a receiver unit controller 61, an RF receiving circuit 62, and a receiving antenna 64.
- a display unit 63 is connected to the receiver unit controller 61.
- the receiver unit controller 61 is a processor including a microcomputer including a CPU and a storage unit (ROM, RAM, and the like), and a program that comprehensively controls the operation of the receiver unit 60 is stored in the storage unit.
- the RF receiving circuit 62 demodulates the signal transmitted from each sensor unit 31 and received through the receiving antenna 64 and sends the demodulated signal to the receiver unit controller 61.
- the receiver unit controller 61 specifies the state of the tire 15 (tire pressure and temperature in the tire) corresponding to the sensor unit 31 of the transmission source based on the signal demodulated by the RF receiving circuit 62.
- the receiver unit controller 61 displays information related to the state of the tire 15 on the display unit 63.
- the sensor unit controller 41 selects one of a normal mode and a power saving mode that can reduce power consumption as compared with the normal mode for receiving a wireless transmission signal from an external device. Can be set as The sensor unit controller 41 sets the control mode by setting a value indicating the normal mode or a value indicating the power saving mode in the control mode flag assigned to the storage unit 41b.
- the sensor unit controller 41 sets the RF communication circuit 46 in a standby state.
- the sensor unit controller 41 sets the RF communication circuit 46 to a dormant state.
- the sensor unit controller 41 reads a value from the control mode flag assigned to the storage unit 41b, and determines whether or not it is the normal mode based on the value (step S11). ). When it is determined that the normal mode is selected, the sensor unit controller 41 determines whether or not the RF communication circuit 46 has received the trigger signal (step S12).
- the trigger signal is used to confirm that the sensor unit 31 is operating normally when the tire is replaced or that the tire state is appropriate, or the ID code of the sensor unit 31 is It is a control signal transmitted from an external device to control the sensor unit 31 when set.
- the sensor unit controller 41 executes processing according to the control information included in the trigger signal and sets the control mode flag assigned to the storage unit 41b. Then, a value indicating the power saving mode is set, and the control mode is set to the power saving mode (step S15).
- the sensor unit controller 41 determines whether a specified time has elapsed since the control mode was set to the normal mode (step S13). When it is determined that the specified time has elapsed since the control mode is set to the normal mode, the sensor unit controller 41 sets a value indicating the power saving mode in the control mode flag assigned to the storage unit 41b, and performs control. The mode is set to the power saving mode (step S15).
- the sensor unit controller 41 determines whether or not the vehicle 10 is traveling (step S14). When it is determined that the vehicle 10 is traveling, the sensor unit controller 41 sets a value indicating the power saving mode in the control mode flag assigned to the storage unit 41b, and sets the control mode to the power saving mode. (Step S15). If it is not determined that the vehicle 10 is traveling, the sensor unit controller 41 ends the mode control process without executing step S15.
- the sensor unit controller 41 determines whether or not the change amount of the capacitance exceeds the reference change amount (step) S16). When it is determined that the amount of change in capacitance exceeds the reference amount of change, the sensor unit controller 41 sets a value indicating the normal mode in the control mode flag assigned to the storage unit 41b, and sets the control mode to the normal mode. (Step S17). When it is determined in the power saving mode that the change amount of the capacitance does not exceed the reference change amount, the sensor unit controller 41 ends the mode control process without executing Step S15.
- the start condition of the normal mode (that is, the end condition of the power saving mode) is satisfied when the change amount of the capacitance of the valve stem 18 exceeds the reference change amount.
- the normal mode end condition (that is, the power saving mode start condition) is that when the RF communication circuit 46 receives a trigger signal in the normal mode, a specified time has elapsed since the control mode was set to the normal mode. And when at least one of the case where the vehicle 10 is traveling is satisfied.
- each sensor unit 31 in the normal mode the RF communication circuit 46 is controlled in a standby state in which a wireless transmission signal from an external device can be received.
- the RF communication circuit 46 is maintained in a dormant state in which a wireless transmission signal from an external device cannot be received.
- the process for specifying the capacitance of the valve stem 18 is not executed.
- the process for specifying the capacitance of the valve stem 18 is executed.
- the control mode is switched from the mode to the power saving mode.
- the control mode is switched to the normal mode on the assumption that the operator touches the valve stem 18 when replacing the tire.
- the control mode is switched to the power saving mode in which the power consumption for receiving the radio transmission signal from the external device is smaller than that in the normal mode. Power consumption for signal reception can be reduced.
- the RF communication circuit 46 uses radio waves in the ultra-high frequency band.
- the power consumption for signal reception is larger than when radio waves in the ultra-short frequency band are used, but the control mode is switched to the power saving mode so that the RF communication circuit 46 can receive signals.
- the frequency of the state can also be reduced, and the power consumption for receiving the wireless transmission signal from the external device can be reduced.
- the trigger signal can be received by maintaining the standby state of the RF communication circuit 46 in the normal mode.
- the control mode can be switched from the normal mode to the power saving mode, and the power consumption for receiving the wireless transmission signal from the external device can be reduced.
- the control mode can be switched from the normal mode to the power saving mode, and the frequency at which the RF communication circuit 46 enters the standby state is set.
- the power consumption for receiving the wireless transmission signal from the external device can be reduced.
- the frequency with which the RF communication circuit 46 receives the trigger signal tends to be lower than when the vehicle 10 is stopped. Therefore, when it is detected that the vehicle 10 that is in a situation where the frequency of receiving the trigger signal is low, the RF communication circuit 46 is set in the standby state by switching the control mode from the normal mode to the power saving mode. Can be reduced, and power consumption for reception of a wireless transmission signal from an external device can be reduced.
- the control mode is changed to the normal mode by performing processing for specifying the capacitance of the valve stem 18 while the vehicle 10 is stopped. Can be switched. Since the tire 15 is not exchanged when the vehicle 10 is traveling, the processing for specifying the capacitance of the valve stem 18 is not performed while the vehicle 10 is traveling, and power consumption can be reduced correspondingly. it can.
- a normal mode start condition when other conditions different from the conditions of the above embodiment are satisfied, such as when a predetermined time elapses after the change amount of the capacitance of the valve stem 18 exceeds the reference change amount. May be established.
- the sensor unit 31 may control the RF communication circuit 46 to a standby state in the power saving mode if the power consumption is lower than that in the normal mode.
- the RF communication circuit 46 in the normal mode, is controlled to a first standby state in which a wireless transmission signal from an external device can be received at a first specified period.
- the RF communication circuit 46 In the power saving mode, the RF communication circuit 46 may be controlled to a second standby state in which a wireless transmission signal from an external device can be received at a second predetermined period longer than the first predetermined period.
- the sensor unit 31 may make a determination on the capacitance of the valve stem 18 while the vehicle 10 is traveling. That is, the sensor unit 31 may perform processing for specifying the capacitance of the valve stem 18 regardless of whether the vehicle is stopped or traveling.
- the sensor unit 31 may make a determination on the capacitance of the valve stem 18 in the normal mode (standby state of the RF communication circuit 46). That is, regardless of the control mode, a process for specifying the capacitance of the valve stem 18 may be performed.
- the transmission circuit and the reception circuit may be provided separately, and the frequency bands used for the transmission circuit and the reception circuit may be different.
- the sensor unit 31 transmits a signal using radio waves in the ultra-high frequency band, but may transmit signals using radio waves in a frequency band other than the ultra-high frequency.
- the control mode may be switched to the normal mode according to the measurement result of the complex impedance including the inductor and the resistance value. That is, it is only necessary that the electrical characteristics of the tire valve 17 can be detected so that contact with the tire valve 17 can be estimated when the tire 15 is replaced.
- the normal mode end condition may be satisfied due to the trigger signal reception, the passage of the specified time, and other factors different from the traveling of the vehicle 10, or the combination of these factors may satisfy the normal mode end condition. Good.
- the sensor unit 31 detects the air pressure and temperature in the tire as the state of the tire. However, either one of these parameters may be detected, and other parameters such as the degree of tire wear may be detected. Also good.
- the sensor unit 31 is not limited to application to the tire 15 in a four-wheel vehicle, and may be applied to tires in one to three-wheeled vehicles and five or more vehicles.
- SYMBOLS 10 ... Vehicle, 13 ... Wheel, 14 ... Vehicle wheel, 15 ... Tire, 17 ... Tire valve, 18 ... Valve stem, 30 ... Tire condition monitoring device, 31 ... Sensor unit, 41 ... Sensor unit controller, 42 ... Pressure sensor , 43 ... temperature sensor, 44 ... acceleration sensor, 45 ... capacitance sensor, 46 ... RF communication circuit, 48 ... battery, 60 ... receiver unit.
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Abstract
Description
この発明の目的は、消費電力を低減することができるタイヤ状態検出装置を提供することにある。
これによれば、タイヤの交換が行われた後などにおいてバルブステムに作業者が触れた場合に、バルブステムの静電容量の変化量が基準変化量を超えることを契機として、制御モードが通常モードに切り替えられる。
これによれば、極超短波の周波数帯域の信号が受信可能であることにより、超短波の周波数帯域の信号を受信する場合よりも、信号の受信についての消費電力が大きくなるが、制御モードが通常モードから省電力モードに切り替えられることによって、受信部が信号を受信可能な待機状態となる頻度も低くすることができ、外部機器からの無線送信信号の受信についての消費電力を低減することができる。
上記タイヤ状態検出装置について、前記制御部は、前記車両が停止中であるときに前記バルブステムの電気的特性の変化量を特定する処理を実行し、前記車両が走行中であるときに前記バルブステムの電気的特性の変化量を特定する処理を実行しないように構成されてもよい。
図1に示すように、車両10には、4つの車輪13が取り付けられており、タイヤ状態監視装置30が搭載されている。各車輪13は、車両用ホイール14と、車両用ホイール14に装着されたタイヤ15とから構成されている。
図2に示すように、センサユニット31は、車両用ホイール14のリム16に装着されるタイヤバルブ17に取り付けられて該タイヤバルブ17に一体化されるとともに、車両用ホイール14に装着されたタイヤ15内に配置される。
最初に、図5に示すように、センサユニットコントローラ41は、記憶部41bに割り当てられた制御モードフラグから値を読み出し、その値に基づいて、通常モードであるか否かを判定する(ステップS11)。通常モードであると判定された場合、センサユニットコントローラ41は、RF通信回路46がトリガ信号を受信したか否かを判定する(ステップS12)。本実施形態において、トリガ信号は、タイヤ交換が行われた場合にセンサユニット31が正常に動作していることやタイヤの状態が適正であることを確認するとき、或いはセンサユニット31のIDコードが設定されるときに、センサユニット31を制御すべく外部機器から送信される制御信号である。RF通信回路46がトリガ信号を受信したと判定された場合、センサユニットコントローラ41は、トリガ信号中に含まれる制御情報に応じた処理を実行するとともに、記憶部41bに割り当てられた制御モードフラグに、省電力モードを示す値を設定し、制御モードを省電力モードに設定する(ステップS15)。
各センサユニット31において、通常モードでは、外部機器からの無線送信信号を受信可能な待機状態にRF通信回路46が制御される。一方、省電力モードでは、外部機器からの無線送信信号を受信不可能な休止状態にRF通信回路46が維持される。車両10が走行中であるとき、又は、RF通信回路46が待機状態に制御されているときには、バルブステム18の静電容量を特定する処理が実行されない。車両10が停止中であり、かつ、RF通信回路46が休止状態に制御されているときには、バルブステム18の静電容量を特定する処理が実行される。
(1)通常モード時において終了条件が成立することにより、外部機器からの無線送信信号の受信について通常モードよりも消費電力が小さい省電力モードに制御モードが切り替えられるので、外部機器からの無線送信信号の受信についての消費電力を低減することができる。
○ バルブステム18の静電容量の変化量が基準変化量を超えてから予め定めた時間が経過するなど、上記実施形態の条件とは異なる他の条件が成立したときに、通常モードの開始条件が成立してもよい。
○ センサユニット31は、極超短波の周波数帯域の電波を用いて信号を送信したが、極超短波以外の周波数帯域の電波を用いて信号を送信してもよい。
Claims (6)
- 車両の車輪のタイヤ内に配置されるように前記車輪のバルブステムに取り付けられるタイヤ状態検出装置であって、
前記タイヤの状態を検出するように構成される状態検出部と、
前記状態検出部によって検出された情報を含む信号を無線送信するように構成される送信部と、
外部機器から無線送信された信号を受信可能な受信部と、
前記送信部及び前記受信部の制御を行うように構成される制御部と、
前記バルブステムの電気的特性を検出するように構成される特性検出部と、
前記タイヤ状態検出装置の電力源となる電池と、を備え、
前記制御部は、前記受信部を前記外部機器からの無線送信信号を受信可能な待機状態に維持する通常モードと、前記外部機器からの無線送信信号の受信について前記通常モードよりも消費電力が小さい省電力モードとから選択された制御モードで動作するように構成され、
前記制御部は、前記特性検出部によって検出された前記バルブステムの電気的特性の変化量が基準変化量を超えた場合に、前記制御モードを前記通常モードに切り替えるとともに、前記通常モード時において終了条件が成立したときに前記制御モードを前記省電力モードに切り替えるように構成されるタイヤ状態検出装置。 - 前記特性検出部は、前記バルブステムにおける静電容量を検出するように構成される請求項1に記載のタイヤ状態検出装置。
- 前記受信部は、極超短波の周波数帯域の信号を受信可能である請求項1又は請求項2に記載のタイヤ状態検出装置。
- 前記終了条件は、前記受信部により前記外部機器からの無線送信信号が受信されたこと、前記制御モードが前記通常モードに切り替えられてから予め定められた時間が経過したこと、及び、車両の走行を検知したことの少なくとも何れかが満たされることにより成立する請求項1~請求項3のうち何れか一項に記載のタイヤ状態検出装置。
- 前記制御部は、前記通常モード時において前記バルブステムの電気的特性の変化量を特定する処理を実行しないように構成される請求項1~請求項4のうち何れか一項に記載のタイヤ状態検出装置。
- 前記制御部は、前記車両が停止中であるときに前記バルブステムの電気的特性の変化量を特定する処理を実行し、前記車両が走行中であるときに前記バルブステムの電気的特性の変化量を特定する処理を実行しないように構成される請求項1~請求項5のうち何れか一項に記載のタイヤ状態検出装置。
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