WO2018003693A1 - Capteur monté sur pneu et dispositif d'estimation de condition de surface de route le comprenant - Google Patents

Capteur monté sur pneu et dispositif d'estimation de condition de surface de route le comprenant Download PDF

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Publication number
WO2018003693A1
WO2018003693A1 PCT/JP2017/023193 JP2017023193W WO2018003693A1 WO 2018003693 A1 WO2018003693 A1 WO 2018003693A1 JP 2017023193 W JP2017023193 W JP 2017023193W WO 2018003693 A1 WO2018003693 A1 WO 2018003693A1
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WO
WIPO (PCT)
Prior art keywords
road surface
tire
change
transmission
data
Prior art date
Application number
PCT/JP2017/023193
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English (en)
Japanese (ja)
Inventor
雅士 森
高俊 関澤
良佑 神林
Original Assignee
株式会社デンソー
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Priority claimed from JP2017110682A external-priority patent/JP2018009974A/ja
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to US16/313,069 priority Critical patent/US20190225227A1/en
Publication of WO2018003693A1 publication Critical patent/WO2018003693A1/fr

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C7/00—Tracing profiles
    • G01C7/02—Tracing profiles of land surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology

Definitions

  • the present disclosure detects a vibration received by a tire, creates a road surface data indicating the road surface state based on the vibration data, and transmits the road surface state to the vehicle side system, and a road surface state estimation that estimates the road surface state based on the vibration data. It relates to the device.
  • a tire mount sensor is provided on the back surface of a tire tread, and vibration applied to the tire is detected by the tire mount sensor, and the detection result of the vibration is transmitted to the vehicle body system to estimate the road surface state.
  • a road surface state estimating device to perform has been proposed.
  • the road surface state is estimated based on a detection signal of a vibration detection unit provided in the tire mount sensor. Specifically, the level of the high frequency component in the detection signal of the vibration detection unit changes according to the road surface state. For this reason, the level of the high-frequency component in the detection signal of the vibration detection unit in the grounding section is defined as the road surface state when the portion corresponding to the placement position of the tire mount sensor in the tire tread is in contact with the road surface.
  • road surface data Used as road surface data.
  • road surface data is transmitted from the tire mount sensor to the vehicle body side system, and the road surface state is estimated based on the road surface data in the vehicle body side system. More specifically, an integrated voltage value obtained by integrating a high-frequency component of a detection signal indicated as a voltage value is used as road surface data.
  • a road surface friction coefficient (hereinafter referred to as road surface ⁇ ) is based on the magnitude of the integrated voltage value. Etc. are estimated.
  • An object of the present disclosure is to provide a tire mount sensor that can reduce power required for data transmission and can quickly transmit a change in a road surface state to a vehicle body side system, and a road surface state estimation device including the tire mount sensor. .
  • the tire mount sensor in one viewpoint of this indication is a tire mount sensor attached to the back of a tire, Comprising: The vibration detection part which outputs the detection signal according to the size of the vibration of a tire, The detection signal of a vibration detection part A signal processing unit that detects a road surface state from vibration data indicated by and a transmission unit that transmits road surface data representing the road surface state, and the signal processing unit responds to changes in the road surface state due to tire rotation. A transmission control unit that sets a transmission interval of road surface data and transmits the road data from the transmission unit.
  • the transmission interval can be changed, and the timing for increasing the transmission interval can be included. For this reason, it is possible to reduce the power required for data transmission at least at the timing of increasing the transmission interval, compared to the case where the transmission interval is always constant.
  • the transmission control unit detects when the road surface state has changed with the rotation of the tire and when the road surface state has not changed. At the time of change, the transmission interval is made shorter than when there is no change, and the road surface data is transmitted from the transmitter.
  • the transmission interval is made shorter than when there is no change, so that the change in the road surface condition can be quickly transmitted to the vehicle body system.
  • a vehicle danger avoidance device 100 including a road surface state estimation device will be described.
  • the vehicle risk avoidance device 100 according to the present embodiment estimates a road surface state during traveling based on vibration applied to a ground contact surface of a tire provided on each wheel of the vehicle, and also determines the risk of the vehicle based on the road surface state. Notification and vehicle motion control are performed.
  • the vehicle danger avoidance device 100 includes a tire mount sensor 1 provided on the wheel side and a vehicle body side system 2 including each part provided on the vehicle body side.
  • the vehicle body side system 2 includes a receiver 21, an electronic control device for brake control (hereinafter referred to as a brake ECU) 22, a vehicle communication device 23, a notification device 24, and the like.
  • the vehicle danger avoidance device 100 transmits data representing the road surface condition during traveling, such as data indicating the road surface ⁇ between the tire 3 and the road surface during traveling, from the tire mount sensor 1.
  • data representing the road surface condition during traveling such as data indicating the road surface ⁇ between the tire 3 and the road surface during traveling
  • ⁇ data data representing the road surface state
  • road surface data data representing the road surface state
  • the vehicle danger avoidance device 100 receives road surface data transmitted from the tire mount sensor 1 by the receiver 21 and notifies the road surface state indicated by the road surface data. 24 tells. As a result, it is possible to inform the driver of the road surface condition such as low road surface ⁇ , dry road, wet road or frozen road, and it is possible to warn the driver when the road surface is slippery. Become. Further, the vehicle risk avoidance device 100 transmits the vehicle surface state to the brake ECU 22 that performs vehicle motion control, so that vehicle motion control for avoiding danger is performed.
  • the vehicle danger avoidance device 100 transmits road surface data to the communication center 200 through the vehicle communication device 23 so that the road surface state can be mapped as described later.
  • the tire mount sensor 1 and the receiver 21 are configured as follows.
  • the tire mount sensor 1 is a tire side device provided on the tire side. As shown in FIG. 2, the tire mount sensor 1 includes an acceleration sensor 11, a temperature sensor 12, a control unit 13, an RF circuit 14, and a power source 15. As shown in FIG. 31 is provided on the back side.
  • the acceleration sensor 11 constitutes a vibration detection unit for detecting vibration applied to the tire.
  • the acceleration sensor 11 detects the acceleration as a detection signal corresponding to the vibration in the tire tangential direction indicated by the arrow X in FIG. 3 in the direction in contact with the circular orbit drawn by the tire mount sensor 1 when the tire 3 rotates.
  • the detection signal is output.
  • the acceleration sensor 11 generates, as a detection signal, an output voltage in which one of the two directions indicated by the arrow X is positive and the opposite is negative.
  • the temperature sensor 12 outputs a detection signal corresponding to the temperature, and measures the temperature of the traveling road surface by detecting the temperature at the mounting position of the tire mount sensor 1 in the tire 3.
  • the control unit 13 is a portion corresponding to a signal processing unit, and uses the detection signal of the acceleration sensor 11 as a detection signal representing vibration data in the tire tangential direction, obtains road surface data by processing the detection signal, It plays a role of transmitting it to the RF circuit 14. Specifically, the control unit 13 extracts the ground contact section of the acceleration sensor 11 when the tire 3 rotates based on the detection signal of the acceleration sensor 11, that is, the time change of the output voltage of the acceleration sensor 11. Note that the contact section here means a section in which a portion of the tread 31 of the tire 3 corresponding to the position where the acceleration sensor 11 is disposed is grounded on the road surface.
  • the portion corresponding to the location where the tire mount sensor 1 is disposed in the tread 31 of the tire 3 is the road surface. It is an agreement with the grounded section.
  • the control unit 13 Since the high frequency component included in the detection signal of the acceleration sensor 11 in the contact section represents the road surface state, the control unit 13 extracts the high frequency component from the detection signal and extracts the high frequency component as described later. Is used to detect the road surface condition such as the road surface ⁇ .
  • the control unit 13 since the temperature of the traveling road surface is measured by the temperature sensor 12, the control unit 13 detects the road surface state based on the temperature of the traveling road surface, The road surface condition obtained from the high-frequency component of the detection signal is corrected.
  • the control unit 13 when the control unit 13 detects the road surface state, the control unit 13 generates road surface data indicating the road surface state, and performs a process of transmitting the road surface data to the RF circuit 14. Thereby, road surface data is transmitted to the receiver 21 through the RF circuit 14. At this time, if road surface data is transmitted from the RF circuit 14 every time the tire 3 makes one revolution, power consumption increases. For this reason, the transmission interval is lengthened to reduce the number of transmissions. However, if the transmission interval is simply increased, the change cannot be quickly transmitted to the vehicle body side system 2 when the road surface state changes. For this reason, the transmission interval is set according to the change in the road surface condition.
  • control unit 13 is configured by a known microcomputer including a CPU, ROM, RAM, I / O, and the like, and performs the above-described processing according to a program stored in the ROM.
  • control part 13 is provided with the area extraction part 13a, the level calculation part 13b, the data generation part 13c, and the transmission control part 13d as a function part which performs those processes.
  • the section extracting unit 13a extracts the ground section by detecting the peak value of the detection signal represented by the output voltage of the acceleration sensor 11.
  • the output voltage waveform of the acceleration sensor 11 during tire rotation is, for example, the waveform shown in FIG.
  • the output voltage of the acceleration sensor 11 takes a maximum value at the start of grounding when the portion of the tread 31 corresponding to the location where the acceleration sensor 11 is disposed begins to ground as the tire 3 rotates.
  • the section extraction unit 13a detects the start of grounding at which the output voltage of the acceleration sensor 11 takes a maximum value as the timing of the first peak value. Further, as shown in FIG.
  • the voltage takes a local minimum.
  • the section extraction unit 13a detects the end of grounding when the output voltage of the acceleration sensor 11 takes a minimum value as the timing of the second peak value.
  • the reason why the output voltage of the acceleration sensor 11 takes a peak value at the above timing is as follows. That is, when the portion of the tread 31 corresponding to the location where the acceleration sensor 11 is disposed contacts with the rotation of the tire 3, the portion of the tire 3 that has been a substantially cylindrical surface is pressed in the vicinity of the acceleration sensor 11. To be flat. By receiving an impact at this time, the output voltage of the acceleration sensor 11 takes the first peak value. Further, when the portion of the tread 31 corresponding to the location where the acceleration sensor 11 is disposed moves away from the grounding surface as the tire 3 rotates, the tire 3 is released from pressing in the vicinity of the acceleration sensor 11 and is substantially flat from the plane. Return to the cylindrical shape.
  • the output voltage of the acceleration sensor 11 takes the second peak value.
  • the output voltage of the acceleration sensor 11 takes the first and second peak values at the start of grounding and at the end of grounding, respectively.
  • the sign of the output voltage is also opposite.
  • the section extraction unit 13a extracts the ground contact section of the acceleration sensor 11 by extracting the detection signal data including the timings of the first and second peak values, and the level calculation unit 13b indicates that it is in the ground contact section. To tell.
  • the section extraction unit 13a sends a detection signal to the transmission control unit 13d at this timing. As a result, the transmission control unit 13d is informed that the tire 3 has made one rotation.
  • the level calculation unit 13b when notified from the section extraction unit 13a that it is in the grounding section, calculates the level of the high-frequency component caused by the vibration of the tire 3 included in the output voltage of the acceleration sensor 11 during that period. Then, the level calculation unit 13b transmits the calculation result to the data generation unit 13c as road surface data such as ⁇ data.
  • the level of the high-frequency component is calculated as an index representing the road surface state such as the road surface ⁇ .
  • FIG. 5A shows a change in the output voltage of the acceleration sensor 11 when traveling on a high ⁇ road surface having a relatively large road surface ⁇ such as an asphalt road.
  • FIG. 5B shows the change in the output voltage of the acceleration sensor 11 when the vehicle is traveling on a low ⁇ road surface where the road surface ⁇ is relatively small to the extent corresponding to the frozen road.
  • the first and second peak values appear at the beginning and end of the contact section, that is, at the start and end of the contact of the acceleration sensor 11, regardless of the road surface ⁇ .
  • the output voltage of the acceleration sensor 11 changes due to the influence of the road surface ⁇ .
  • the road surface ⁇ is low, such as when traveling on a low ⁇ road surface
  • fine high-frequency vibration due to slip of the tire 3 is superimposed on the output voltage.
  • Such a fine high-frequency signal due to the slip of the tire 3 is not superposed when the road surface ⁇ is high, such as when traveling on a high ⁇ road surface.
  • the frequency analysis of the output voltage during the grounding section is performed for each of the cases where the road surface ⁇ is high and low, the result shown in FIG. 6 is obtained.
  • the level is high when the road surface ⁇ is high or low, but in the high frequency range of 1 kHz or higher, the level is higher when the road surface ⁇ is low than when it is high. .
  • the level of the high frequency component of the output voltage of the acceleration sensor 11 serves as an index representing the road surface state.
  • the level calculation unit 13b calculates the level of the high frequency component of the output voltage of the acceleration sensor 11 during the grounding section by the level calculation unit 13b. Therefore, by calculating the level of the high frequency component of the output voltage of the acceleration sensor 11 during the grounding section by the level calculation unit 13b, this can be converted to ⁇ data. Further, from the ⁇ data, for example, when the road surface ⁇ is low, the road surface type corresponding to the road surface ⁇ can be detected as a road surface state, such as determining that the road is frozen.
  • the level of the high frequency component can be calculated by extracting the high frequency component from the output voltage of the acceleration sensor 11 and integrating the extracted high frequency component during the grounding section.
  • the high frequency components of the frequency bands fa to fb that are assumed to change according to the road surface condition and the road surface ⁇ are extracted by filtering or the like, and the voltages of the high frequency components of the frequency bands fa to fb extracted by the frequency analysis are obtained. Integrate.
  • a capacitor (not shown) is charged. In this way, the amount of charge increases when the road surface ⁇ is low, such as when traveling on a low ⁇ road surface, rather than when the road surface ⁇ is high, such as when traveling on a high ⁇ road surface. .
  • this charge amount as the ⁇ data it is possible to estimate the road surface ⁇ such that the larger the charge amount indicated by the ⁇ data, the lower the road surface ⁇ .
  • the data generation unit 13c basically generates road surface data based on the calculation result of the level calculation unit 13b.
  • the data generation unit 13c adopts ⁇ data as it is as road surface data, obtains a road surface state such as a frozen road or an asphalt road from ⁇ data, and generates data indicating the road surface data as road surface data.
  • the temperature of the traveling road surface is measured by the temperature sensor 12.
  • the data generation unit 13c acquires the road surface temperature by inputting the detection signal of the temperature sensor 12, detects the type of the road surface from the acquired road surface temperature, or obtains from ⁇ data correction or ⁇ data. The type of road is corrected.
  • the data generation unit 13c detects that the road surface is frozen as the type of the road surface. Furthermore, the data generation unit 13c corrects the ⁇ data obtained from the high frequency component of the detection signal of the acceleration sensor 11 or the road surface type indicated by the ⁇ data when the road surface temperature detected by the temperature sensor 12 does not match. Or not adopted as a road surface condition detection result. For example, when the road surface type obtained from the high-frequency component of the detection signal of the acceleration sensor 11 is in a frozen state, and the road surface temperature detected by the temperature sensor 12 is 40 ° C., the road surface type of the frozen state is set. It is thought that there is an error in the detection result.
  • the data generation unit 13c does not adopt the result transmitted from the level calculation unit 13b as the detection result of the road surface type.
  • the road surface ⁇ indicated by the ⁇ data does not match the type of road surface obtained from the road surface temperature, for example, if the road surface ⁇ indicated by the ⁇ data is high even though the road surface temperature is detected as frozen, the ⁇ data Is corrected to a lower value than before the correction.
  • the transmission control unit 13d detects a change in road surface state based on the road surface data generated by the data generation unit 13c. Then, the transmission control unit 13d sets the transmission interval of road surface data by the RF circuit 14 according to the detected change in the road surface state, in other words, the transmission cycle, and the transmission trigger for the RF circuit 14 according to the interval. Is output. For example, when changing from dry road to wet road, conversely changing from wet road to dry road, changing from high ⁇ road to low ⁇ road, changing from low ⁇ road to high ⁇ road, etc. It is detected as a change in road surface condition. Then, a transmission trigger is output from the transmission control unit 13d when, for example, the road surface state changes according to the change in the road surface state.
  • the transmission trigger is output, for example, every one rotation or a plurality of rotations of the tire 3 according to a change in the road surface state.
  • the timing at which the transmission trigger is output at any timing of the rotation of the tire 3 is arbitrary.
  • the transmission trigger is output at the end of the grounding, that is, at the timing when the output voltage of the acceleration sensor 11 reaches the second minimum peak value. To be.
  • the transmission control unit 13d performs transmission so that road surface data is transmitted at a predetermined transmission interval as regular transmission when the road surface state indicated by the data generated by the data generation unit 13c does not change. Generate a trigger. At the time of no change, the road surface every time the tire 3 rotates a plurality of times in order to improve the battery life by reducing the power consumption or to prevent the receiver 21 from receiving data due to duplication of data transmission with other wheels.
  • the transmission interval at which data is transmitted once is used. For example, road surface data is transmitted at a rate of once every time the tire 3 rotates five times. In this case, the road surface data is transmitted to the vehicle body side system 2 every time the vehicle travels approximately 10 m.
  • the transmission control unit 13d transmits the road surface data at a predetermined transmission interval that is shorter than that when there is no change as short cycle transmission when the road surface state indicated by the data generated by the data generation unit 13c changes. Generate a transmission trigger. For example, at the time of change, the transmission interval is set so that road surface data is transmitted every time the tire 3 makes one rotation. At this time, it is good also as a transmission interval by which road surface data is transmitted only once for every rotation of the tire 3, and furthermore, the same road surface data is transmitted a plurality of times for each rotation of the tire 3. You can also.
  • the transmission control unit 13d determines that the tire is based on the detection signal.
  • the number of rotations of 3 can be detected.
  • a detection signal is sent every time the output voltage of the acceleration sensor 11 takes the first peak value from the section extraction unit 13a, or a detection signal is sent every time a ground section is extracted. Even if it makes it, it can detect the rotation speed of the tire 3 similarly.
  • the RF circuit 14 constitutes a transmission unit that transmits road surface data such as ⁇ data transmitted from the data generation unit 13c to the receiver 21, and in the case of the present embodiment, transmission from the transmission control unit 13d.
  • Road surface data is transmitted based on the trigger.
  • Communication between the RF circuit 14 and the receiver 21 can be performed by a known short-range wireless communication technique such as Bluetooth (registered trademark).
  • the timing for transmitting the road surface data is arbitrary, but as described above, in this embodiment, when the road surface condition is unchanged, the road surface data is transmitted at a rate of once every time the tire 3 rotates a plurality of times. ing. When the road surface condition changes, the transmission interval is shorter than when there is no change, and the road surface data is transmitted every time the tire 3 makes one revolution.
  • the road surface data is sent together with the unique identification information (hereinafter referred to as ID information) of the wheels provided in advance for each tire 3 provided in the vehicle.
  • ID information unique identification information
  • the position of each wheel can be specified by a well-known wheel position detection device that detects which position of the vehicle the wheel is attached to. Therefore, by transmitting road surface data together with ID information to the receiver 21, data on which wheel is detected. Can be determined.
  • the power source 15 is constituted by a battery, for example, and supplies power for driving each part of the tire mount sensor 1.
  • the receiver 21 receives the road surface data transmitted from the tire mount sensor 1, estimates the road surface state based on the road surface data, and transmits the estimated road surface state to the notification device 24, and from the notification device 24 as necessary. Inform the driver of the road surface condition. As a result, the driver tries to drive corresponding to the road surface condition, and the danger of the vehicle can be avoided.
  • the estimated road surface state may be always displayed through the notification device 24, or the estimated road surface state needs to be operated more carefully such as a wet road, a frozen road, a low ⁇ road, or the like. Only when the road surface condition is displayed, the driver may be warned.
  • the road surface state is transmitted from the receiver 21 to the ECU for executing the vehicle motion control such as the brake ECU 22, and the vehicle motion control is executed based on the transmitted road surface state. Furthermore, the receiver 21 performs a process of outputting road surface data to the vehicle communication device 23. Based on this, road surface data is sent from the vehicle communication device 23 to the communication center 200 collecting road information and the like.
  • Brake ECU22 comprises the brake control apparatus which performs various brake control. Specifically, the brake ECU 22 controls the braking force by driving the brake fluid pressure control actuator to increase or decrease the wheel cylinder pressure. The brake ECU 22 can also control the braking force of each wheel independently.
  • the braking force is controlled as vehicle motion control based on the road surface state. For example, when the transmitted road surface state indicates that the road surface is a frozen road, the brake ECU 22 weakens the braking force generated with respect to the amount of brake operation performed by the driver as compared with the case where the road surface ⁇ is large. . Thereby, wheel slip can be suppressed and it becomes possible to avoid the danger of a vehicle.
  • the vehicle communication device 23 can perform road-to-vehicle communication, and exchanges information with the communication center 200 via a communication system (not shown) installed on a road, for example.
  • the vehicle communication device 23 transmits road surface data transmitted from the receiver 21 to the communication center 200.
  • the vehicle communication device 23 can also receive more accurate road surface data from the communication center 200.
  • the notification device 24 is composed of, for example, a meter display and is used when notifying the driver of the road surface state.
  • the notification device 24 is configured by a meter display
  • the notification device 24 is disposed in a place where the driver can visually recognize the vehicle while driving, for example, in an instrument panel in the vehicle.
  • the meter display can visually notify the driver of the road surface state by performing display in such a manner that the road surface state can be grasped.
  • the notification device 24 can be configured by a buzzer or a voice guidance device. In that case, the notification device 24 can audibly notify the driver of the road surface state by a buzzer sound or voice guidance.
  • the meter display device is exemplified as the notification device 24 that performs visual notification, the notification device 24 may be configured by a display device that displays information such as a head-up display.
  • each part which comprises the vehicle body side system 2 is connected through in-vehicle LAN (abbreviation of Local * AreaNetwork) by CAN (abbreviation for Controller
  • in-vehicle LAN abbreviation of Local * AreaNetwork
  • CAN abbreviation for Controller
  • the communication center 200 that exchanges information on road surface data with the vehicle danger avoidance device 100 performs a business of collecting road information and providing road information to vehicles and the like.
  • the communication center 200 and the vehicle communication device 23 may be configured to directly communicate with each other, but the communication center 200 can communicate with the vehicle communication device 23 through a communication system installed in various places such as roads. Yes.
  • the communication center 200 manages the road surface state information for each road location in the map data as a database, and maps the road surface state that changes every moment based on the received road surface data. Is going. That is, the communication center 200 updates the road surface state information for each road location in the map data based on the received road surface data.
  • the communication center 200 provides road surface data to the vehicle from the database.
  • the communication center 200 collects road surface data of the road on which the vehicle traveled from the vehicle travels, and updates the road surface data of each road in the map data based on the road surface data.
  • the communication center 200 also collects weather information and the like, corrects each road surface data based on the weather information and updates it as more reliable road surface data.
  • the communication center 200 acquires information on the amount of snow and the frozen road surface as weather information, and more accurate road surface data is sequentially stored by updating the snow covered road surface and the frozen road surface to the corresponding road surface data. I try to do it.
  • the communication center 200 provides the vehicle with the road surface data stored in the database so that more accurate road surface data is transmitted to the vehicle.
  • the communication center 200 collects road surface data from a large number of vehicles and updates the road surface data of each road in the map data stored in the database. As well as road surface data of a road to be traveled can be acquired.
  • the control unit 13 executes a road surface data transmission process shown in FIG. This process is executed, for example, every time the tire 3 makes one rotation based on the power supply from the power supply 15.
  • step S100 road surface condition detection processing is performed. Specifically, a high-frequency component is extracted from the detection signal of the acceleration sensor 11, that is, the output voltage, and the road surface ⁇ is detected based on the high-frequency component extracted during the contact section, or the type of the road surface is detected. Detect road surface condition. Then, ⁇ data indicating the road surface ⁇ or road surface data including the type of the road surface is created.
  • step S110 the road surface state obtained in step S100 is compared with the road surface state obtained during the previous tire rotation to determine whether or not the road surface state has changed. For example, when the type of the road surface changes so as to switch from a wet road to a dry road, or when the road surface ⁇ changes so that the road surface ⁇ switches from a state higher than a predetermined threshold to a low state, the road surface state changes. Judge that there was.
  • step S110 If a negative determination is made in step S110, the process proceeds to step S120, and periodic transmission processing is performed so that road surface data is transmitted at a transmission interval when there is no change in the road surface state. That is, as shown in FIG. 8A, road surface data is transmitted from the RF circuit 14 to the receiver 21 at a predetermined transmission interval set as regular transmission, for example, every time the tire 3 rotates a plurality of times. So that FIG. 8A shows a case where the vehicle continuously travels on a dry road as an example of no change.
  • step S110 the process proceeds to step S130, and a short cycle transmission process is performed so that road surface data is transmitted at the transmission interval at the time of change, which is shorter than the time of no change.
  • the road surface data is sent from the RF circuit 14 to the receiver 21 at a predetermined transmission interval set as short cycle transmission, for example, once or every time the tire 3 rotates once.
  • FIG. 8B shows, as an example at the time of change, a case where the vehicle travels on a road surface that switches from a dry road to a wet road and then switches to a dry road.
  • the road surface data is transmitted at a rate of once or a plurality of times each time the tire 3 rotates a plurality of times when the road surface state does not change, and when the road surface state changes, the transmission interval is made shorter than when there is no change. Data can be sent.
  • the vehicle danger avoidance device 100 sets the transmission interval of road surface data in accordance with changes in road surface conditions.
  • the transmission interval can be changed, and the transmission interval can be included in a timing for increasing the transmission interval. For this reason, it is possible to reduce the power required for data transmission at least at the timing of increasing the transmission interval, compared to the case where the transmission interval is always constant.
  • road surface data is transmitted at a rate of once every time the tire 3 rotates a plurality of times so that the power consumption of the power source 15 is reduced when the road surface state is unchanged.
  • the vehicle danger avoidance device 100 is configured to transmit road surface data when the road surface state changes, with a transmission interval shorter than when there is no change. In this way, it is possible to reduce the power required for data transmission by reducing the transmission of road surface data when there is no change in the road surface condition. Further, at the time of change, the transmission interval is made shorter than that at the time of no change, and for example, every time the tire 3 makes one rotation, the circuit surface data is transmitted once. For this reason, it becomes possible to quickly transmit the change in the road surface state to the vehicle body side system 2.
  • any one of the plurality of transmission data can be received by the receiver 21 such as a null. Even if not, the remaining transmission data can be received by the receiver 21. Therefore, transmission data can be more reliably transmitted to the vehicle body side system 2.
  • the transmission interval is shorter than when there is no change.
  • An example to do This is merely an example of setting the transmission interval of road surface data, and other forms may be used.
  • the transmission interval of road surface data may be made shorter when the road surface state is unchanged than when the road surface state is changed. Even in this case, since it is possible to include the timing to increase the transmission interval, the power required for data transmission is reduced at least at the timing to increase the transmission interval, as compared with the case where the transmission interval is always constant. Is possible.
  • both the change time and no change time are detected, but only the change time is detected, and the road surface data transmission interval is shortened compared to before detection at the time of change, etc. It may be changed.
  • the transmission interval of road surface data is set according to the change.
  • changes in the road surface condition may be detected due to noise or the like, if the changed road surface condition continues during the subsequent tire rotation after the change in the road surface condition is detected, the change in the road surface condition A corresponding transmission interval may be set. In this way, it is possible to prevent the driver from being notified until a change in the road surface state is detected in noise.
  • the timing at which the notification by the notification device 24 and the control corresponding to the road surface state in the vehicle motion control are performed may be made different. That is, the notification by the notification device 24 is not performed immediately after a change in the road surface state is detected, but is performed when the changed road surface state continues for a plurality of rotations of the tire 3. And about vehicle motion control, you may make it perform vehicle motion control according to the road surface state after changing immediately after detecting the change of a road surface state.
  • a ground contact area is identified from the detection signal of the acceleration sensor 11 which comprises a vibration detection part, and the road surface data by which the road surface state was shown by the calculation result of the level of the high frequency component in the detection signal in a ground contact area. It is used as. However, this is only an example of a method for detecting the road surface state using the detection signal at the vibration detection unit, and even if the road surface state is detected by another method using the detection signal at the vibration detection unit. good.
  • the vibration detection part can also be comprised by the element which can perform another vibration detection, for example, a piezoelectric element.
  • the power source 15 is not limited to a battery, and may be configured by a power generation element or the like. For example, if a vibration detection element is used, the power supply 15 can be configured while the vibration detection unit is configured by the vibration detection element.
  • the receiver 21 plays a role as a control unit that determines a change in road surface state based on road surface data.
  • a control unit may be provided separately from the receiver 21, or another ECU such as the brake ECU 22 may function as the control unit.
  • the road surface state estimation device is incorporated in the vehicle danger avoidance device.
  • the portion that estimates the road surface state for example, in the case of the above embodiment, the tire mount sensor 1 and the receiver 21 correspond to the road surface state estimation device. It is good also as a structure only.

Abstract

Dans le cadre de la présente invention, lorsqu'une condition de surface de route ne change pas, des données de surface de route sont transmises par un capteur monté sur pneu (1) à une fréquence d'une fois à chaque fois qu'un pneu (3) tourne plusieurs fois, afin de réduire la consommation d'énergie électrique d'une source d'alimentation électrique. En outre, lorsque la condition de surface de route change, les données de surface de route sont transmises par le capteur monté sur pneu (1) avec un intervalle de transmission qui est plus court que lorsque la condition de surface de route ne change pas. De cette manière, la réduction de la quantité de données de surface de route qui est transmise lorsque la condition de surface de route ne change pas permet de réduire la quantité d'énergie électrique requise pour la transmission de données. En outre, l'utilisation d'un intervalle de transmission qui est plus court lorsque la condition de surface de route change que lorsque la condition de surface de route ne change pas permet aux changements de la condition de surface de route d'être communiqués rapidement à un système côté carrosserie de véhicule (2).
PCT/JP2017/023193 2016-07-01 2017-06-23 Capteur monté sur pneu et dispositif d'estimation de condition de surface de route le comprenant WO2018003693A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/313,069 US20190225227A1 (en) 2016-07-01 2017-06-23 Tire-mounted sensor and road surface condition estimation device including same

Applications Claiming Priority (4)

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JP2016-131789 2016-07-01
JP2016131789 2016-07-01
JP2017110682A JP2018009974A (ja) 2016-07-01 2017-06-05 タイヤマウントセンサおよびそれを含む路面状態推定装置
JP2017-110682 2017-06-05

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WO2019151415A1 (fr) * 2018-02-01 2019-08-08 株式会社デンソー Dispositif de détermination de l'état de la surface d'une route
CN111114550A (zh) * 2018-10-30 2020-05-08 长城汽车股份有限公司 车辆控制方法和控制装置及车辆和存储介质

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JP2010241342A (ja) * 2009-04-08 2010-10-28 Mitsubishi Electric Corp 路面状況判定装置及び路面状況判定方法
JP2015038516A (ja) * 2014-11-27 2015-02-26 株式会社ブリヂストン 路面状態推定方法
JP2015174638A (ja) * 2014-03-18 2015-10-05 株式会社日本自動車部品総合研究所 路面状況推定装置

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JP2008100610A (ja) * 2006-10-19 2008-05-01 Yokohama Rubber Co Ltd:The 走行路面状態検出システム及びそのセンサユニット
JP2010241342A (ja) * 2009-04-08 2010-10-28 Mitsubishi Electric Corp 路面状況判定装置及び路面状況判定方法
JP2015174638A (ja) * 2014-03-18 2015-10-05 株式会社日本自動車部品総合研究所 路面状況推定装置
JP2015038516A (ja) * 2014-11-27 2015-02-26 株式会社ブリヂストン 路面状態推定方法

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* Cited by examiner, † Cited by third party
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WO2019151415A1 (fr) * 2018-02-01 2019-08-08 株式会社デンソー Dispositif de détermination de l'état de la surface d'une route
CN111114550A (zh) * 2018-10-30 2020-05-08 长城汽车股份有限公司 车辆控制方法和控制装置及车辆和存储介质
CN111114550B (zh) * 2018-10-30 2021-11-23 长城汽车股份有限公司 车辆控制方法和控制装置及车辆和存储介质

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