WO2017042910A1 - タイヤ状態検出装置、及び車輪位置特定装置 - Google Patents
タイヤ状態検出装置、及び車輪位置特定装置 Download PDFInfo
- Publication number
- WO2017042910A1 WO2017042910A1 PCT/JP2015/075614 JP2015075614W WO2017042910A1 WO 2017042910 A1 WO2017042910 A1 WO 2017042910A1 JP 2015075614 W JP2015075614 W JP 2015075614W WO 2017042910 A1 WO2017042910 A1 WO 2017042910A1
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- Prior art keywords
- angle
- acquisition
- wheel
- difference
- acceleration value
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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
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
- B60C23/0489—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors for detecting the actual angular position of the monitoring device while the wheel is turning
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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
- B60C23/0415—Automatically identifying wheel mounted units, e.g. after replacement or exchange of wheels
- B60C23/0416—Automatically identifying wheel mounted units, e.g. after replacement or exchange of wheels allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
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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
-
- 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
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
- B60C23/0488—Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0025—Measuring of vehicle parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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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
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2240/00—Monitoring, detecting wheel/tire behaviour; counteracting thereof
- B60T2240/03—Tire sensors
Definitions
- the present invention relates to a tire condition detecting device and a wheel position specifying device.
- a wireless tire condition monitoring device has been proposed in which a driver can check the condition of a plurality of tires provided in a vehicle in the passenger compartment.
- each wheel is provided with a tire condition detection device that transmits a data signal related to the tire condition.
- the vehicle body is provided with a receiver that receives a data signal from the tire condition detection device.
- the tire condition monitoring device identifies which tire of the plurality of tires the received data signal is transmitted from. In other words, the position of the wheel associated with the received data signal is identified at the receiver.
- an ABS anti-lock / brake system
- the tire state detection device for each wheel transmits a transmission signal to the receiver when the wheel has a predetermined rotation angle (hereinafter referred to as an angle).
- the predetermined angle is detected by an acceleration sensor that rotates with the wheel.
- the gravitational acceleration value detected by the acceleration sensor changes between ⁇ 1G and + 1G while the wheel rotates once.
- the tire state detection device transmits a transmission signal when the wheel has a predetermined angle based on the gravitational acceleration value detected by the acceleration sensor.
- the receiver receives the transmission signal, the receiver detects the rotational position of the wheel using the ABS.
- the transmission signal is transmitted every time the wheel is at a predetermined angle. For this reason, when the rotational position of each wheel is detected at the time of receiving the transmission signal, the rotational position of the wheel provided with the tire state detection device that transmitted the transmission signal becomes the same every time. Thereby, each tire state detection apparatus can pinpoint which wheel is provided among several wheels.
- the tire condition detection device intermittently acquires the gravitational acceleration value of the acceleration sensor in order to reduce the power consumption of the battery as a power source. For this reason, there exists a time when the tire state detection device cannot acquire the gravitational acceleration value. For this reason, when the transmission signal is transmitted based on the gravitational acceleration value, a deviation occurs in a predetermined angle at which the transmission signal is transmitted due to the frequency of acquisition of the gravitational acceleration value. Thereby, there exists a possibility that time required to pinpoint the position of the wheel in which each tire state detection apparatus was provided may become long.
- An object of the present invention is to provide a tire state detection device and a wheel position specifying device that can shorten the time required to specify the position of a wheel.
- a tire condition detection device provided on each of a plurality of wheels of a vehicle.
- the vehicle includes a rotation position detection unit that detects the rotation positions of the plurality of wheels.
- the tire state detection device includes a state detection unit that detects the state of the tire, an acceleration sensor that rotates together with the wheel and detects a gravitational acceleration value, and an angle that is set in advance while the wheel rotates once.
- the acquisition angle after the acquisition angle at which the gravitational acceleration value decreases from increasing to decreasing or increases from decreasing to increasing A calculation unit that calculates an acceleration difference between a gravitational acceleration value acquired at a certain first acquisition angle and a gravitational acceleration value acquired at a second acquisition angle that is an acquisition angle before the first acquisition angle; and between adjacent acquisition angles
- a storage unit that stores a correction formula that is predetermined based on the angle difference and the angle difference between the first acquisition angle and the second acquisition angle and that corrects the first acquisition angle from the acceleration difference to a predetermined angle; and a tire In addition to information indicating the status of A tire by obtaining a rotational position of a wheel detected by a rotational position detection unit triggered by reception of a transmission signal transmitted from the transmission unit and a transmission signal transmitted from the transmission unit including information indicating a predetermined angle
- the gravitational acceleration value detected by the acceleration sensor changes between + 1G and -1G.
- the gravitational acceleration value is acquired every other time, in other words, the angular difference between adjacent acquisition angles , Can be grasped in advance.
- each acquisition angle is the same angle every time, and the gravity acceleration value is acquired at the same angle every time.
- an angle corresponding to each acquisition angle when one rotation of the wheel (0 degree to 359 degrees) is equally divided by each acquisition angle is set as a predetermined angle.
- the predetermined angle of the first acquisition angle is set as the first predetermined angle
- the predetermined angle of the second acquisition angle is set as the second predetermined angle. If the number of gravitational acceleration values acquired during one rotation of the wheel is always constant, the first acquisition angle is always a first predetermined angle that is a predetermined angle. However, in practice, the first acquisition angle may not be the first predetermined angle due to a change in the rotational speed of the wheels accompanying the acceleration / deceleration of the vehicle, the tolerance of each member constituting the tire state detection device, or the like.
- the inventor correlates the angular difference between the first acquisition angle and the first predetermined angle and the acceleration difference between the gravitational acceleration value acquired at the first acquisition angle and the gravitational acceleration value acquired at the second acquisition angle. I found that a relationship exists. That is, when there is an angle difference between the first acquisition angle and the first predetermined angle, it can be considered that the same angle difference is also generated between the second acquisition angle and the second predetermined angle. When there is an angle difference between the first acquisition angle and the first predetermined angle, acceleration is performed between the gravitational acceleration value acquired at the first acquisition angle and the gravitational acceleration value acquired at the second acquisition angle according to the angle difference. There is a difference. The acceleration difference differs depending on the angle difference between adjacent acquisition angles and the angle difference between the first acquisition angle and the second acquisition angle. However, if the angle difference between adjacent acquisition angles and the angle difference between the first acquisition angle and the second acquisition angle can be grasped in advance, the angle difference between the first acquisition angle and the first predetermined angle can be calculated from the acceleration difference. .
- the angle difference between the first acquisition angle and the first predetermined angle is calculated from the acceleration difference based on the correlation using the correction formula. Then, by correcting the first acquisition angle to the first predetermined angle, the first acquisition angle can be corrected to a predetermined angle (first predetermined angle).
- the tire condition detection device cannot directly derive the angle difference between the first acquisition angle and the first predetermined angle
- the acceleration difference can be derived because the acceleration sensor can detect the gravitational acceleration value.
- the first acquisition angle is corrected to a predetermined angle from the acceleration difference, so that the rotation position of the wheel provided with the tire state detection device that transmitted the transmission signal and the rotation of other wheels are provided. It becomes easy to grasp the variation from the position (difference in rotational position). For this reason, compared with the case where the correction
- the control unit transmits a transmission signal including information on an angular difference between a first acquisition angle calculated from an acceleration difference and a correction formula and a predetermined angle in addition to information indicating a tire condition. It is preferable to transmit at the first acquisition angle.
- the wheel position specifying device acquires the rotational position of the wheel detected by the rotational position detection unit when the transmission signal is received. Further, the wheel position specifying device reflects the angle difference between the first acquisition angle and the first predetermined angle in the rotation position of the wheel acquired from the rotation position detection unit. Thereby, the rotational position of the wheel acquired from the rotational position detection unit can be corrected to the rotational position acquired at a predetermined angle (first predetermined angle). For this reason, the wheel position specifying device can specify the position of the wheel provided with each tire state detecting device from the rotational position of the wheel acquired at a predetermined angle. Therefore, the time required for specifying which wheel of the plurality of wheels the tire state detection device is provided is shortened.
- the control unit calculates an angle difference between the first acquisition angle and a predetermined angle from the acceleration difference and the correction formula, and determines a predetermined angle from the first acquisition angle based on the angle difference. It is preferable to calculate the time difference until the transmission signal including the time difference information is transmitted at the first acquisition angle.
- the control unit calculates a time difference until the rotational position of the wheel reaches the predetermined angle from the first acquisition angle from the angle difference between the first acquisition angle and the predetermined angle. And a wheel position specific device acquires a rotation position at the time according to the time difference, when a transmission signal is received. For this reason, the wheel position specifying device can specify the position of the wheel provided with each tire state detecting device from the rotational position of the wheel acquired at a predetermined angle. Therefore, the time required for specifying which wheel of the plurality of wheels the tire state detection device is provided is shortened.
- the control unit calculates an angle difference between the first acquisition angle and a predetermined angle from the acceleration difference and the correction formula, and a transmission signal is transmitted according to the calculated angle difference. It is preferable to transmit the transmission signal at a constant angle by delaying the time.
- the angle at which the transmission signal is transmitted deviates from a predetermined angle due to the acquisition frequency.
- the error can be reduced by correcting the first acquisition angle to a predetermined angle.
- the wheel position specifying device acquires the rotational position of the wheel when it receives the transmission signal, the rotational position of the wheel provided with the tire state detection device that transmitted the transmission signal is less likely to vary. Therefore, the time required for specifying which wheel of the plurality of wheels the tire condition detection device is provided is shortened.
- a plurality of tire condition detection devices are provided on the basis of transmission signals transmitted from tire condition detection devices provided on each of a plurality of wheels of the vehicle.
- a wheel position specifying device that specifies which of the wheels is provided is provided.
- the tire state detection device includes a state detection unit that detects the state of the tire, an acceleration sensor that rotates together with the wheel and detects a gravitational acceleration value, and an angle that is set in advance while the wheel rotates once.
- the wheel position specifying device includes a receiving side acquisition unit that acquires a rotation position of each wheel at the time of receiving a transmission signal from a rotation position detection unit mounted on the vehicle, an angle difference between adjacent acquisition angles, and a first acquisition angle.
- a receiving side storage unit storing a correction formula that is predetermined based on an angle difference between the first acquisition angle and the second acquisition angle and that corrects the first acquisition angle from the acceleration difference to a predetermined angle, and acquired by the receiving side acquisition unit
- a specifying unit for specifying which wheel the tire condition detecting device is provided on the basis of the variation in the corrected rotational position by correcting the rotational position to a rotational position at a predetermined angle.
- the receiving side acquisition unit acquires the rotational position of the wheel at the time of receiving the transmission signal from the rotational position detection unit.
- the transmission signal includes information indicating the acceleration difference.
- the rotation signal of the wheel at the time of receiving the transmission signal transmitted at the first acquisition angle using the correction formula stored in the reception-side storage unit is transmitted at a predetermined angle. It can correct
- the variation in the rotational position of the wheel acquired from the rotational position detection unit corresponding to the wheel provided with the tire state detection device that transmitted the transmission signal is reduced. For this reason, the time required to specify the position of the wheel provided with the tire condition detection device is shortened.
- the time required to specify the position of the wheel can be shortened.
- (A) is a schematic block diagram of the vehicle by which the wheel position specific apparatus which concerns on one Embodiment of this invention is mounted
- (b) is a schematic diagram which shows the relationship between the detection axis
- (A) is a schematic block diagram of a rotation sensor unit
- (b) is a schematic diagram for explaining a pulse generated in a detector and a pulse counting method.
- (A) is a graph which shows the change of an acceleration value
- (b) is a graph which shows the change of the acceleration value by a gravitational acceleration value.
- (A) is a graph showing a predetermined angle of each acquisition angle
- (b) is a graph showing a state where each acquisition angle is deviated by ⁇ 15 degrees from the predetermined angle
- (c) is a graph where each acquisition angle is deviated by +15 degrees from the predetermined angle.
- (A)-(c) is a graph which shows the transmission signal transmitted at a fixed angle.
- the vehicle 10 is equipped with an ABS (anti-lock / brake system) 20 and a tire condition monitoring device 30.
- the ABS 20 includes an ABS controller 25 and rotation sensor units 21 to 24 corresponding to the four wheels 11 of the vehicle 10, respectively.
- the first rotation sensor unit 21 corresponds to the left front wheel FL provided on the front left side
- the second rotation sensor unit 22 corresponds to the right front wheel FR provided on the front right side
- the third rotation sensor unit 23 corresponds to the left rear wheel RL provided on the rear left side
- the fourth rotation sensor unit 24 corresponds to the right rear wheel RR provided on the rear right side.
- Each wheel 11 includes a vehicle wheel 12 and a tire 13 attached to the vehicle wheel 12.
- the ABS controller 25 is formed of a microcomputer or the like, and obtains the rotation position (rotation angle) of each wheel 11 based on the pulse count values from the rotation sensor units 21 to 24.
- each of the rotation sensor units 21 to 24 as the rotation position detector includes a gear 26 that rotates integrally with the wheel 11 and a detector that is disposed so as to face the outer peripheral surface of the gear 26. 27.
- a plurality of (48 in this embodiment) teeth are provided at equal angular intervals.
- the detector 27 detects a pulse generated by the rotation of the gear 26.
- the ABS controller 25 is wired to each detector 27 and determines the rotational position of each wheel 11 based on the pulse count value of each detector 27 (hereinafter, pulse count value). Specifically, every time the gear 26 rotates, the detector 27 generates a number of pulses corresponding to the number of teeth.
- the ABS controller 25 counts pulses generated in the detector 27.
- the ABS controller 25 grasps how many times the gear 26 has rotated per pulse count by dividing 360 degrees by the number of pulses generated in the detector 27 while the wheel 11 makes one rotation (360 degrees).
- the ABS controller 25 counts from 0 to 95 by counting the rise and fall of the pulse. For this reason, every time the wheel 11 rotates 3.75 degrees, the pulse count value increases by one.
- the tire condition monitoring device 30 includes a transmitter 31 attached to each of the four wheels 11 and a receiver 50 installed on the vehicle body of the vehicle 10. Each transmitter 31 is disposed in the internal space of the tire 13, and the tire 13 is attached to the vehicle wheel 12. Each transmitter 31 as a tire condition detection device detects the condition of the corresponding tire 13 and wirelessly transmits a signal including data indicating the tire condition.
- each transmitter 31 includes a pressure sensor 32, a temperature sensor 33, an acceleration sensor 34, a controller 35, a transmission circuit 36, a transmission antenna 38, and a battery 37 serving as a power source for the transmitter 31. Yes.
- the transmitter 31 is operated by the power supplied from the battery 37, and the controller 35 comprehensively controls the operation of the transmitter 31.
- the pressure sensor 32 detects a corresponding pressure in the tire 13 (in-tire pressure).
- the temperature sensor 33 detects the temperature in the corresponding tire 13 (in-tire temperature). The pressure in the tire 13 and the temperature in the tire 13 are detected as the state of the tire 13 using the pressure sensor 32 and the temperature sensor 33 as the state detection unit.
- the acceleration sensor 34 rotates integrally with the wheel 11 to detect acceleration acting on itself.
- the acceleration sensor 34 is provided so that the detection shaft 34a faces downward in the vertical direction when the transmitter 31 is located at the lowest position of the wheel 11.
- the detection shaft 34a detects the centrifugal acceleration value as a direct current component and detects the gravitational acceleration value as an alternating current component. From the acceleration sensor 34, an acceleration value obtained by adding a gravitational acceleration value to a centrifugal acceleration value is output.
- the vehicle 10 accelerates to time T1, travels at a constant speed from time T1 to time T2, and decelerates from time T2.
- the acceleration value detected by the acceleration sensor 34 increases until the time T1 due to the increase in the centrifugal acceleration value due to the acceleration of the vehicle 10, and decreases from the time T2 due to the decrease in the centrifugal acceleration value due to the deceleration of the vehicle 10.
- the acceleration value is substantially constant from time T1 to time T2 when the vehicle 10 is traveling at a constant speed.
- the acceleration value includes a gravitational acceleration value as an AC component. For this reason, the acceleration value changes in a sine wave shape according to the gravitational acceleration.
- FIG. 4 (b) shows an enlarged view of the portion indicated by reference numeral A1 in FIG. 4 (a).
- the AC component included in the acceleration value changes in a sine wave shape between ⁇ 1 G (corresponding to a voltage) due to the rotation of the wheel 11.
- the angle of the wheel 11 when the transmitter 31 is located at the foremost position of the wheel 11 is 0 degree, and the angle when the wheel 11 moves forward in the direction in which the vehicle 10 moves forward is positive.
- the acceleration sensor 34 detects an acceleration value obtained by adding 0 G as a gravity acceleration value to the centrifugal acceleration value.
- the transmitter 31 (acceleration sensor 34) is located at the lowest position of the wheel 11, and the acceleration sensor 34 detects an acceleration value obtained by adding + 1G as a gravity acceleration value to the centrifugal acceleration value. To do.
- the transmitter 31 is located at the last position of the wheel 11, and the acceleration sensor 34 detects an acceleration value obtained by adding 0 G as a gravity acceleration value to the centrifugal acceleration value.
- the acceleration sensor 34 detects an acceleration value obtained by adding ⁇ 1G as an acceleration value to the centrifugal acceleration value.
- the controller 35 includes a CPU 35a, a microcomputer including a storage unit (RAM, ROM, etc.) 35b and a timer 35c.
- An ID that is identification information unique to each transmitter 31 is registered in the storage unit 35b.
- the ID is information used to identify each transmitter 31 in the receiver 50.
- the ID of the transmitter 31 provided on the left front wheel FL is “1”
- the ID of the transmitter 31 provided on the right front wheel FR is “2”
- the ID of the transmitter 31 provided on the right rear wheel RR is “4”.
- the ID is expressed as “1” to “4”, but is not limited thereto.
- the controller 35 as an acquisition unit acquires the in-tire pressure data from the pressure sensor 32, the in-tire temperature data from the temperature sensor 33, and the acceleration data from the acceleration sensor 34 at a predetermined acquisition frequency.
- the acquisition frequency of each data may be the same or different depending on the data.
- the controller 35 acquires acceleration data every time the wheel 11 is located at eight acquisition angles P1 to P8 during one rotation (one cycle). Although the rotation speed of the wheel 11 changes due to acceleration / deceleration by the driver, the controller 35 calculates the time required for the wheel 11 to make one rotation from the acceleration value of the acceleration sensor 34. As described above, since the acceleration value of the acceleration sensor 34 changes depending on the speed of the vehicle 10, the speed of the vehicle 10, and thus the time required for the wheel 11 to make one rotation can be calculated from the acceleration value. The controller 35 determines an acquisition frequency obtained by equally dividing the time required for the wheel 11 to make one rotation by 8, and acquires acceleration data from the acceleration sensor 34 at the determined acquisition frequency. As a result, the controller 35 acquires acceleration data from the acceleration sensor 34 at every 45 degrees that is an angle difference between the acquisition angles P1 to P8 while the wheel 11 makes one rotation.
- the controller 35 as a control unit outputs data including tire pressure data, tire temperature data, and ID to the transmission circuit 36.
- a transmission circuit 36 as a transmission unit modulates data from the controller 35 to generate a transmission signal. Then, the transmission circuit 36 wirelessly transmits the transmission signal from the transmission antenna 38.
- the receiver 50 includes a reception controller 51, a reception circuit 52, and a reception antenna 54.
- a display device 53 is connected to the reception controller 51.
- the reception controller 51 includes a microcomputer including a reception side CPU 51a, a reception side storage unit (ROM, RAM, etc.) 51b, and a reception side timer 51c.
- a program for comprehensively controlling the operation of the receiver 50 is stored in the reception-side storage unit 51b.
- the reception circuit 52 demodulates the transmission signal received from each transmitter 31 through the reception antenna 54 and sends it to the reception controller 51.
- the reception controller 51 grasps the tire internal pressure and the tire internal temperature as the state of the tire 13 corresponding to the transmission source transmitter 31 based on the transmission signal from the reception circuit 52.
- the reception controller 51 displays information related to the tire internal pressure on the display unit 53.
- the reception controller 51 is connected to the ABS controller 25 and can acquire the pulse count values of the rotation sensor units 21 to 24 through the ABS controller 25.
- a wheel position specifying process for specifying which of the wheels 11 each transmitter 31 is provided will be described with reference to FIGS. 5 (a) to 5 (c). First, the transmitter 31 will be described in detail.
- the controller 35 of the transmitter 31 acquires acceleration data at each of the acquisition angles P1 to P8.
- the controller 35 compares the acceleration value acquired at one acquisition angle with the acceleration value acquired at the acquisition angle one time before the acquisition angle. Then, the controller 35 determines whether the acceleration value acquired at each acquisition angle has increased or decreased from the acceleration value acquired at the previous acquisition angle.
- “+” is added when the acceleration value is larger than the acceleration value acquired at the previous acquisition angle, and acquired at the previous acquisition angle.
- “ ⁇ ” Is added when the acceleration value is smaller than the acceleration value.
- an acquisition angle in which the acceleration value has increased from the previous time is expressed as “+”, and an acquisition angle in which the acceleration value has decreased from the previous time is expressed as “ ⁇ ”.
- the acceleration value is a value obtained by adding the gravity acceleration value to the centrifugal acceleration value, it is unlikely that the speed of the vehicle 10 rapidly changes while the wheel 11 makes one revolution. Therefore, the change in the centrifugal acceleration value can be ignored. Therefore, a change in acceleration value between the acquisition angles P1 to P8 can be regarded as a change due to the gravitational acceleration value. Therefore, the acceleration sensor 34 can be regarded as detecting the gravitational acceleration value.
- the timing at which the acceleration value acquired at each acquisition angle P1 to P8 reverses from increasing to decreasing or decreasing to increasing is when the transmitter 31 crosses the lowest position of the wheel 11 or the highest position.
- the acquisition angles in the forward direction of the vehicle 10 are in the order of “+” “ ⁇ ”, or “ ⁇ ” “+”. Line up in the order.
- the acquisition angles are arranged in the order of “+” and “ ⁇ ”, it can be understood that the transmitter 31 has straddled the lowest position of the wheel 11.
- the transmission signal is transmitted at the timing of “ ⁇ ” of “+” and “ ⁇ ”, so that the transmission signal is transmitted from the transmitter 31 at the timing when the transmitter 31 straddles the lowest position of the wheel 11. Is done.
- the acquisition angles are arranged in the order of “ ⁇ ” and “+”, it can be understood that the transmitter 31 has straddled the uppermost position of the wheel 11.
- the transmission signal is transmitted at the timing “+” of “ ⁇ ” and “+”, so that the transmission signal is transmitted from the transmitter 31 at the timing when the transmitter 31 straddles the uppermost position of the wheel 11.
- the transmission signal may be transmitted due to accidental reversal of increase / decrease in the acceleration value due to disturbance or the like.
- the transmitter 31 straddles the lowest position of the wheel 11. It is considered.
- the controller 35 causes the transmitter 31 to transmit a transmission signal at the acquisition angle that is the second “ ⁇ ” in the transmission pattern.
- the number of times the acceleration value is acquired while the wheel 11 makes one revolution is eight times. 0 degrees to 359 degrees are equally divided by eight acquisition angles P1 to P8, and the respective acquisition angles P1 to P8 are set at intervals of 45 degrees, with 0 degrees being P1.
- the angle of the wheel 11 is 90 degrees
- the acquisition angle P5 that is advanced by two from the acquisition angle P3 the angle of the wheel 11 is 180 degrees.
- the transmission signal is always transmitted from the transmitter 31 when the wheel 11 is 180 degrees.
- the acceleration value corresponding to each acquisition angle is acquired intermittently.
- the acquisition angles P1 to P8 do not become the same angle every time due to tolerances and measurement errors of the members constituting the transmitter 31 and a slight speed change during one rotation of the wheel 11. Variation occurs.
- the reception controller 51 of the receiver 50 acquires the pulse count values of the rotation sensor units 21 to 24, that is, the rotational position of the wheel 11 from the ABS controller 25 when receiving the transmission signal. And the receiving controller 51 specifies which wheel 11 each transmitter 31 is provided.
- the description will be given focusing on, for example, the wheel 11 provided with the transmitter 31 having the ID “1” among the four wheels 11.
- the reception controller 51 When receiving the transmission signal transmitted from the transmitter 31 with ID “1”, the reception controller 51 obtains the pulse count value of each of the rotation sensor units 21 to 24 from the ABS controller 25 when the transmission signal is received. To do. The rotational speed of each wheel 11 varies depending on the influence of the differential gear. For this reason, when the pulse count value of each of the rotation sensor units 21 to 24 is acquired a plurality of times when the transmission signal transmitted from the transmitter 31 with ID “1” is received, the transmitter 31 with ID “1” is provided. Only the pulse count values of the rotation sensor units 21 to 24 corresponding to the received wheel 11 are reduced in variation. If the transmission signal is always transmitted at a predetermined angle (180 degrees), the pulse count value of one rotation sensor unit among the plurality of rotation sensor units 21 to 24 is always the same value.
- the reception controller 51 receives a transmission signal a plurality of times. Each time the reception controller 51 receives a transmission signal, the reception controller 51 acquires the pulse count values of the rotation sensor units 21 to 24 and obtains the difference between the pulse count values of the rotation sensor units 21 to 24. The reception controller 51 specifies that the transmitter 31 having ID “1” is provided on the wheel corresponding to the rotation sensor unit having the smallest variation.
- the pulse count value of the rotation sensor unit 21 corresponding to the left front wheel FL shows a constant value. Therefore, it can be understood that the wheel 11 provided with the transmitter 31 with the ID “1” is provided on the left front wheel FL of the vehicle 10.
- the transmitters 31 with IDs “2”, “3”, and “4” it is possible to specify which wheel 11 the transmitter 31 with each ID is provided by performing the same processing as described above. .
- the transmission signal is not always transmitted at a predetermined angle (180 degrees). That is, the angle at which the transmission signal is transmitted varies slightly. As shown in FIG. 5A, an angle corresponding to each acquisition angle obtained by equally dividing 0 to 359 degrees of one rotation of the wheel 11 by eight acquisition angles P1 to P8 is defined as a predetermined angle.
- the acquisition angle P5 at which the controller 35 transmits a transmission signal is defined as a first acquisition angle P5
- a predetermined angle of the first acquisition angle P5 is defined as a first predetermined angle.
- the time required for the wheel 11 to make one rotation is very short. For this reason, a rapid speed change is unlikely to occur while the wheel 11 rotates once. Therefore, the deviations of the acquisition angles P1 to P8 from the predetermined angle can be regarded as the same angle between the acquisition angles P1 to P8.
- the deviation (angle difference) between the acquisition angles P1 to P8 and the predetermined angle is at most half of the angle difference between adjacent acquisition angles.
- the maximum deviation between the acquisition angle and the predetermined angle is ⁇ 22.5 degrees.
- the pulse count acquired by the rotation sensor unit corresponding to the wheel 11 provided with the transmitter 31 that has transmitted the transmission signal is the ideal pulse count value.
- the pulse count value acquired by the rotation sensor unit corresponding to the wheel 11 provided with the transmitter 31 that transmits the transmission signal is As shown in FIG. 7, the pulse count value is shifted from the ideal pulse count value by ⁇ 6 pulse count values (pulse count values for ⁇ 22.5 degrees).
- the wheel position specifying process is always performed from the pulse count value at a predetermined angle in the receiver 50 by correcting the first acquisition angle.
- one of the acquisition angles P1 to P8 before the first acquisition angle P5 that triggers transmission of a transmission signal is set as the second acquisition angle.
- the acquisition angle P1 four times before the first acquisition angle P5 is defined as a second acquisition angle P1
- a predetermined angle of the second acquisition angle P1 is defined as a second predetermined angle.
- the first predetermined angle is 180 degrees
- the second predetermined angle is 0 degrees (360 degrees).
- the angular difference between the first acquisition angle P5 and the first predetermined angle, and the acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1 (first acquisition).
- the acceleration value acquired at the angle P5 and the acceleration value acquired at the second acquisition angle P1 is the second acquisition angle P1.
- the acceleration difference between the first acquisition angle P5 and the second acquisition angle P1 is a difference between the gravitational acceleration value acquired at the first acquisition angle P5 and the gravitational acceleration value acquired at the second acquisition angle P1. I can say that.
- the acceleration difference from the value is 0G.
- the acceleration difference from the acceleration value acquired at is + 0.765G.
- the correlation between the angle difference between the first acquisition angle P5 and the first predetermined angle and the above-described acceleration difference is the angle difference between the adjacent acquisition angles P1 to P8 (45 degrees in the present embodiment) and the first acquisition angle. It differs depending on the angle difference (180 degrees in this embodiment) between the angle P5 and the second acquisition angle P1.
- the number of acquisition angles P1 to P8 during one rotation of the wheel 11 and the angle difference between the first acquisition angle P5 and the second acquisition angle P1 are set in advance. Therefore, the angular difference between the first acquisition angle P5 and the first predetermined angle can be calculated from the acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1. it can.
- the correction angle Y is given by the following correction formula (1).
- ⁇ is a half value of the angle difference between the acquisition angles P1 to P8, in other words, the absolute value of the maximum value of the deviation of the first acquisition angle P5 from the first predetermined angle. Therefore, ⁇ can be derived from the angle difference between the acquisition angles P1 to P8.
- ⁇ is the absolute value of the maximum value of the acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1.
- ⁇ can be derived from the relationship between the angular difference between the first acquisition angle P5 and the second acquisition angle P1 and the acceleration value.
- X is an acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1.
- the correction equation (1) is an approximate equation when it is assumed that the acceleration difference changes linearly according to the angle difference between the first acquisition angle P5 and the first predetermined angle.
- the correction formula (1) indicates the angular difference per acceleration difference, that is, the angular difference between the first acquisition angle P5 and the first predetermined angle.
- the acceleration difference changes in a sine wave shape according to the angle difference between the first acquisition angle and the first predetermined angle, and therefore, a correction formula that takes these into account is employed. You can also.
- the correction formula (2) is stored in the storage unit 35b of the controller 35.
- the controller 35 as a calculation unit calculates an acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1, and calculates a correction angle (first acquisition angle) from the acceleration difference. An angle difference between P5 and the first predetermined angle is calculated.
- the controller 35 also includes correction angle data in addition to the data indicating the tire state in the transmission signal, and transmits the transmission signal to the receiver 50.
- the reception controller 51 acquires the pulse count value of each of the rotation sensor units 21 to 24 at the time of transmitting the transmission signal, and replaces the correction angle included in the transmission signal with the pulse count value (correction angle / 3.75). .
- the reception controller 51 corrects the acquired pulse count value by adding (or subtracting) the correction angle to the pulse count value of each of the rotation sensor units 21 to 24.
- the pulse count values of the rotation sensor units 21 to 24 can be regarded as pulse count values when the first acquisition angle P5 is corrected to a predetermined angle.
- the reception controller 51 acquires the pulse count value of each of the rotation sensor units 21 to 24 when receiving the transmission signal, the rotation sensor unit corresponding to the wheel 11 provided with the transmitter 31 that transmits the transmission signal. Compared to the pulse count value, the corrected pulse count value has less variation.
- the following effects can be obtained. (1) Between the angle difference between the first acquisition angle P5 and the first predetermined angle, and the acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1. There is a correlation. Since the correction formula derived from this correlation is stored in the storage unit 35b, the reception controller 51 can correct the first acquisition angle P5 to a predetermined angle (first predetermined angle). For this reason, the receiver 50 specifies which wheel 11 of each of the plurality of wheels 11 is provided with each transmitter 31 from the variation in the pulse count value that can be regarded as acquired at a predetermined angle. be able to. Therefore, the time required for specifying which wheel 11 among the plurality of wheels 11 each transmitter 31 is provided is shortened.
- the transmitter 31 transmits the transmission signal including information on the correction angle calculated from the acceleration difference and the correction formula.
- the reception controller 51 adds or subtracts the pulse count value corresponding to the correction angle to the pulse count value in each of the rotation sensor units 21 to 24 at the time when the transmission signal is received. Thereby, the reception controller 51 can obtain a pulse count value that can be regarded as acquired when the wheel 11 has a predetermined angle. For this reason, the dispersion
- the controller 35 transmits the transmission signal including the correction angle data from the transmitter 31 to the receiver 50. While calculating the angle difference between the first acquisition angle P5 and the first predetermined angle, From the angle difference, a time difference until the wheel 11 reaches the first predetermined angle from the first acquisition angle P5 may be calculated. Then, the controller 35 may cause the transmitter 31 to transmit a transmission signal including time difference data.
- the reception controller 51 obtains a pulse count value at a time difference from the time when the transmission signal is received. Since the receiver 50 stores the past pulse count value, the pulse count value is acquired retroactively from the time when the transmission signal is received. This pulse count value can be regarded as a pulse count value when the transmission signal is transmitted at a predetermined angle. Therefore, the position of the wheel 11 on which the transmitter 31 is provided can be specified using this pulse count value. Therefore, the time required for specifying which wheel 11 among the plurality of wheels 11 each transmitter 31 is provided is shortened.
- the controller 35 transmits a transmission signal including correction angle data from the transmitter 31, but as shown in FIGS. 9A to 9C, the acceleration difference and the correction equation From this, the angle difference between the first acquisition angle P5 and the first predetermined angle may be calculated, the transmission timing of the transmission signal may be delayed according to this angle difference, and the transmission signal may always be transmitted at a constant angle. For example, when there is no angle difference between the first acquisition angle P5 and the first predetermined angle, the timing for transmitting the transmission signal is delayed by 27.5 degrees. When the angle difference between the first acquisition angle P5 and the first predetermined angle is ⁇ 22.5 degrees, the transmission signal transmission timing is delayed by 50 degrees.
- the transmission signal transmission timing is delayed by 5 degrees.
- the transmission signal is always transmitted at an angle shifted by 27.5 degrees from the first predetermined angle.
- the reception controller 51 specifies the position of the wheel 11 provided with each transmitter 31 from the variation in the pulse count value of each rotation sensor unit 21 to 24 at the time when the transmission signal is received.
- the pulse count value varies slightly due to an error or the like, since the transmission signal is always transmitted at a constant angle, the pulse count value of the rotation sensor unit corresponding to the wheel 11 provided with the transmitter 31 that transmits the transmission signal is Difficult to vary. Therefore, the time required for specifying which wheel 11 among the plurality of wheels 11 each transmitter 31 is provided is shortened.
- the “information indicating the predetermined angle” is not limited to the data included in the transmission signal, and the transmission signal is transmitted at a constant angle that is shifted by a predetermined angle (27.5 degrees) from the predetermined angle. The angle determined by transmission is also included.
- the correction formula is stored in the storage unit 35b of the transmitter 31, but may be stored in the reception-side storage unit 51b of the receiver 50 that functions as a wheel position specifying device.
- the transmitter 31 transmits a transmission signal including data of an acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1 at the first acquisition angle P5.
- the reception controller 51 as a reception side acquisition unit acquires the pulse count value of each of the rotation sensor units 21 to 24 at the time when the transmission signal is received. Furthermore, the reception controller 51 can obtain the acceleration difference between the acceleration value acquired at the first acquisition angle P5 and the acceleration value acquired at the second acquisition angle P1 from the data included in the transmission signal.
- the reception controller 51 can calculate the angle difference between the first acquisition angle at which the transmission signal is transmitted and the first predetermined angle from the acceleration difference and the correction formula stored in the reception-side storage unit 51b.
- the reception controller 51 adds (or subtracts) the pulse count value corresponding to the angle difference between the first acquisition angle and the first predetermined angle to the pulse count value when the transmission signal is received.
- the pulse count value which can be considered that the angle of the wheel 11 is a pulse count value at the first predetermined angle can be obtained. Therefore, it is possible to specify which wheel 11 each transmitter 31 is provided using these pulse count values. Therefore, it is possible to shorten the time required for specifying which wheel 11 among the plurality of wheels 11 each transmitter 31 is provided.
- the transmitter 31 receives the acceleration value data acquired at the first acquisition angle P5 and the acceleration value data acquired at the second acquisition angle P1.
- the included transmission signal may be transmitted to the receiver 50.
- the reception controller 51 determines the acceleration value of the first acquisition angle P5 and the acceleration of the second acquisition angle P1 from the acceleration value data acquired at the first acquisition angle P5 and the acceleration value data acquired at the second acquisition angle P1.
- the acceleration difference from the value is calculated, and the correction angle is calculated from the acceleration difference and the correction formula.
- the reception controller 51 corrects the pulse count value based on the calculated correction angle, and specifies which wheel 11 each transmitter 31 is provided on using the corrected pulse count value. Therefore, the “information indicating the acceleration difference” may be information on the acceleration difference itself or information used for calculating the acceleration difference in the receiver 50.
- the transmission pattern is “+” “+” “ ⁇ ” “ ⁇ ”, but “+” “ ⁇ ”, “ ⁇ ” “ ⁇ ” “+” “+”, “ ⁇ ” It may be “+”, “+”, “+” or “ ⁇ ” “ ⁇ ”. That is, an arbitrary transmission pattern can be set from a pattern generated while the wheel 11 rotates once. Furthermore, these patterns may be combined.
- the 2nd acquisition angle should just be an acquisition angle before a 1st acquisition angle, and is not restricted to the acquisition angle before 4 times.
- the second acquisition angle may be an acquisition angle three times before the first acquisition angle, or may be an acquisition angle having a period different from the first acquisition angle (period before the first acquisition angle).
- the correction formula differs depending on the angle difference between adjacent acquisition angles and the angle difference between the first acquisition angle and the second acquisition angle. For this reason, the first acquisition angle can be corrected to the first predetermined angle by deriving a correction formula in advance and storing it in the storage unit 35b or the reception-side storage unit 51b.
- the acceleration sensor 34 may be arranged so that the detection shaft 34a faces the vertical direction when the acceleration sensor 34 is located at the uppermost position of the wheel 11. In this case, the sign of the gravitational acceleration value detected by the acceleration sensor 34 during one rotation of the wheel 11 is reversed from the above embodiment.
- the acceleration sensor 34 may be configured such that the detection axis faces the vertical direction when the acceleration sensor 34 is located at the foremost position of the wheel 11 or when it is located at the last position of the wheel 11. In this case, the increase and decrease of the gravitational acceleration value detected by the detection axis is reversed at the foremost position of the wheel 11 and the last position of the wheel 11. For this reason, the transmission signal may be transmitted at a timing at which the increase / decrease in the gravitational acceleration value is reversed.
- the number of pulses generated in the detector 27 each time the wheel 11 rotates may be changed as appropriate by changing the number of teeth of the gear 26. Moreover, you may change the pulse count number during one rotation of the wheel 11 by counting either rising or falling.
- Expression (4) is stored in the storage unit 35b or the reception-side storage unit 51b. Then, the controller 35 or the reception controller 51 can calculate the correction angle from the equation (4).
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Abstract
Description
図1(a)に示すように、車両10は、ABS(アンチロック・ブレーキシステム)20及びタイヤ状態監視装置30を搭載している。ABS20は、ABSコントローラ25と、車両10の4つの車輪11にそれぞれ対応する回転センサユニット21~24とを備えている。第1回転センサユニット21は、前側左側に設けられた左前車輪FLに対応し、第2回転センサユニット22は、前側右側に設けられた右前車輪FRに対応している。第3回転センサユニット23は、後側左側に設けられたに左後車輪RLに対応し、第4回転センサユニット24は、後側右側に設けられた右後車輪RRに対応している。各車輪11は、車両用ホイール12と、車両用ホイール12に装着されたタイヤ13とから構成されている。ABSコントローラ25は、マイクロコンピュータ等よりなり、回転センサユニット21~24からのパルスカウント値に基づき各車輪11の回転位置(回転角度)を求める。
図1(a)に示すように、タイヤ状態監視装置30は、4つの車輪11にそれぞれ取り付けられた送信機31と、車両10の車体に設置される受信機50とを備えている。各送信機31は、タイヤ13の内部空間に配置され、そのタイヤ13は、車両用ホイール12に取り付けられている。タイヤ状態検出装置としての各送信機31は、対応するタイヤ13の状態を検出して、タイヤ状態を示すデータを含む信号を無線送信する。
次に、各送信機31が各車輪11のうちのどの車輪11に設けられているかを特定する車輪位置特定処理について、図5(a)~図5(c)を参照して説明する。まず、送信機31について詳細に説明する。
図1に示すように、受信機50の受信コントローラ51は、送信信号を受信した時点で、ABSコントローラ25から各回転センサユニット21~24のパルスカウント値、即ち車輪11の回転位置を取得する。そして、受信コントローラ51は、各送信機31がどの車輪11に設けられているかを特定する。以下、4つの車輪11のうち、例えば、ID「1」の送信機31が設けられた車輪11に着目して説明を行う。
図5(a)に示すように、車輪11が1回転する0度~359度を8個の取得角P1~P8で等分した各取得角に対応する角度を、所定角とする。また、コントローラ35が送信信号を送信する取得角P5を第1取得角P5とし、第1取得角P5の所定角を第1所定角とする。
まず、複数の取得角P1~P8のうち、送信信号を送信するための契機となる第1取得角P5以前の取得角P1~P8のうちの一つを第2取得角とする。第1取得角P5よりも4つ前の取得角P1を第2取得角P1とし、第2取得角P1の所定角を第2所定角とする。第1所定角は180度であり、第2所定角は0度(360度)である。
(1)第1取得角P5と第1所定角との角度差と、第1取得角P5で取得される加速度値と第2取得角P1で取得される加速度値との加速度差との間には、相関関係が存在する。この相関関係から導出された補正式は記憶部35bに記憶されているため、受信コントローラ51は、第1取得角P5を予め決められた角度(第1所定角)に補正することができる。このため、受信機50は、予め決められた角度で取得されたとみなすことができるパルスカウント値のばらつきから、各送信機31が複数の車輪11のうちどの車輪11に設けられているかを特定することができる。したがって、各送信機31が複数の車輪11のうちどの車輪11に設けられているかを特定するのに要する時間が短くなる。
・上記実施形態では、コントローラ35は、補正角度のデータを含む送信信号を送信機31から受信機50に送信させたが、第1取得角P5と第1所定角の角度差を算出するとともに、角度差から、車輪11が第1取得角P5から第1所定角に至るまでの時間差を算出してもよい。そして、コントローラ35は、時間差のデータを含む送信信号を送信機31から送信させてもよい。受信コントローラ51は、送信信号を受信した時点から時間差分ずれた時点でのパルスカウント値を取得する。受信機50は、過去のパルスカウント値を記憶しているため、送信信号を受信した時点から遡って、パルスカウント値を取得する。このパルスカウント値は、送信信号が予め決められた角度で送信されたときのパルスカウント値とみなすことができる。よって、このパルスカウント値を用いて、送信機31が設けられている車輪11の位置を特定することができる。従って、各送信機31が複数の車輪11のうちどの車輪11に設けられているかを特定するのに要する時間が短くなる。
Claims (5)
- 車両の複数の車輪のそれぞれに設けられるタイヤ状態検出装置であって、前記車両は前記複数の車輪のそれぞれの回転位置を検出する回転位置検出部を有する、タイヤ状態検出装置であって、
タイヤの状態を検出する状態検出部と、
前記車輪と一体となって回転するとともに、重力加速度値を検出する加速度センサと、
前記車輪が1回転する間に、予め定められた角度置きに前記重力加速度値を取得する取得部と、
前記重力加速度値が取得されるときの前記車輪の角度を取得角とした場合、前記重力加速度値が増加から減少又は減少から増加へ反転する取得角以降の取得角である第1取得角で取得される前記重力加速度値と前記第1取得角以前の取得角である第2取得角で取得される前記重力加速度値との加速度差を算出する算出部と、
隣り合う取得角間の角度差及び前記第1取得角と前記第2取得角との角度差に基づいて予め定められかつ前記加速度差から前記第1取得角を予め決められた角度に補正する補正式が記憶された記憶部と、
前記タイヤの状態を示す情報に加えて前記予め決められた角度を示す情報を含む送信信号を送信する送信部と、
前記送信部から送信された送信信号の受信を契機として前記回転位置検出部によって検出される前記車輪の回転位置を取得することで前記タイヤ状態検出装置が前記複数の車輪のうちのどの車輪に設けられているかを特定する車輪位置特定装置に向けて、前記送信信号を送信させる制御部と
を備えたタイヤ状態検出装置。 - 前記制御部は、前記タイヤの状態を示す情報に加えて前記加速度差及び前記補正式から算出した前記第1取得角と前記予め決められた角度との角度差の情報を含む前記送信信号を前記第1取得角で送信させる、請求項1に記載のタイヤ状態検出装置。
- 前記制御部は、前記加速度差及び前記補正式から前記第1取得角と前記予め決められた角度との角度差を算出し、前記角度差に基づき前記第1取得角から前記予め決められた角度までの時間差を算出し、更に、前記時間差の情報を含む前記送信信号を前記第1取得角で送信させる、請求項1に記載のタイヤ状態検出装置。
- 前記制御部は、前記加速度差及び前記補正式から前記第1取得角と前記予め決められた角度との角度差を算出し、算出された角度差に応じて前記送信信号が送信される時刻を遅延させることで、一定角度で前記送信信号を送信させる、請求項1に記載のタイヤ状態検出装置。
- 車両の複数の車輪のそれぞれに設けられたタイヤ状態検出装置から送信される送信信号に基づいて、前記タイヤ状態検出装置が前記複数の車輪のうちのどの車輪に設けられているかを特定する車輪位置特定装置であって、
前記タイヤ状態検出装置は、
タイヤの状態を検出する状態検出部と、
車輪と一体となって回転するとともに、重力加速度値を検出する加速度センサと、
前記車輪が1回転する間に、予め定められた角度置きに前記重力加速度値を取得する取得部と、
前記重力加速度値が取得されるときの前記車輪の角度を取得角とした場合、前記重力加速度値が増加から減少又は減少から増加へ反転する前記取得角以降の取得角である第1取得角で取得される前記重力加速度値と前記第1取得角以前の取得角である第2取得角で取得される前記重力加速度値との加速度差を示す情報を前記送信信号に含めて前記第1取得角で送信する送信部とを備え、
前記車輪位置特定装置は、
前記送信信号を受信した時点での各車輪の回転位置を、前記車両に搭載された回転位置検出部から取得する受信側取得部と、
隣り合う取得角間の角度差及び前記第1取得角と前記第2取得角との角度差に基づいて予め定められかつ前記加速度差から前記第1取得角を予め決められた角度に補正する補正式が記憶された受信側記憶部と、
前記受信側取得部によって取得された回転位置を前記予め決められた角度での回転位置に補正して、補正された回転位置のばらつきから、前記タイヤ状態検出装置がどの車輪に設けられているかを特定する特定部と
を備えた車輪位置特定装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/022,785 US10464380B2 (en) | 2015-09-09 | 2015-09-09 | Tire state detecting device and wheel position specifying device |
KR1020167007149A KR101790906B1 (ko) | 2015-09-09 | 2015-09-09 | 타이어 상태 검출 장치 및 차륜 위치 특정 장치 |
JP2016514183A JP6147919B1 (ja) | 2015-09-09 | 2015-09-09 | タイヤ状態検出装置、及び車輪位置特定装置 |
CN201580001926.5A CN107107687B (zh) | 2015-09-09 | 2015-09-09 | 轮胎状态检测装置和车轮位置确定装置 |
EP15839136.7A EP3168066B1 (en) | 2015-09-09 | 2015-09-09 | Tire condition detection device, and wheel position identification device |
PCT/JP2015/075614 WO2017042910A1 (ja) | 2015-09-09 | 2015-09-09 | タイヤ状態検出装置、及び車輪位置特定装置 |
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CN109153297B (zh) * | 2017-04-27 | 2020-10-27 | 太平洋工业株式会社 | 接收器 |
TWI633430B (zh) * | 2017-06-27 | 2018-08-21 | 橙的電子股份有限公司 | Wheel position determination system and wheel position determination method |
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CN112203874B (zh) * | 2018-10-01 | 2022-10-14 | 太平洋工业株式会社 | 轮胎状态监视系统、发送器以及接收器 |
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KR101790906B1 (ko) | 2017-10-26 |
US20170259627A1 (en) | 2017-09-14 |
EP3168066A1 (en) | 2017-05-17 |
JPWO2017042910A1 (ja) | 2017-09-07 |
EP3168066B1 (en) | 2019-07-03 |
US10464380B2 (en) | 2019-11-05 |
JP6147919B1 (ja) | 2017-06-14 |
EP3168066A4 (en) | 2018-01-24 |
CN107107687A (zh) | 2017-08-29 |
KR20170040780A (ko) | 2017-04-13 |
CN107107687B (zh) | 2019-06-07 |
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