JP7267390B2 - Signal Receiving and Transmitting Angle Localization Method for Tire Pressure Monitoring System - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wireless tire pressure monitoring and measuring method, and more particularly to a localization method for a tire pressure monitoring system that performs localization based on the transmission/reception angle of radio signals.

Vehicle tires have a very high probability of causing traffic accidents due to abnormal air pressure in the tires. Taking a common four-wheeled vehicle as an example, a tire pressure monitoring system generally has four tire pressure detectors and a receiver. Each tire pressure detector is attached to each tire. When the tire pressure detector is triggered, it will transfer the tire pressure signal to the receiving device at a set time interval, and display the tire pressure value of each tire by the display connected to the receiving device. display and issue a warning signal if any one of the tire pressure detector values is abnormal.

In order to accurately identify the position of the tire with abnormal tire pressure, the tire localization method in the conventional tire pressure monitoring system incorporates a set of identification codes in each tire pressure detector, and its limitation is: When installing the tire pressure detector, it is necessary to install it according to the set position of the tire pressure monitoring system (for example, the set mounting position of the tire pressure detector whose identification code is 3310A is the left front wheel). , and the set installation position of the tire pressure detector whose identification code is 3320B is located at the right front wheel.). Otherwise, the tire pressure monitoring system cannot obtain accurate tire measurements at each location.

However, if you want to replace the tire pressure detector, first read the identification code of each original tire pressure detector, and then input the original identification code to the new tire pressure detector one by one. is necessary. Otherwise, the vehicle control computer will not be able to communicate with the new tire pressure detector via the original identification code. In addition, the task of entering the original identification code into the new tire pressure detector one by one is complicated and takes a lot of man-hours. It is necessary to copy the identification code to the new tire pressure detector. Therefore, the general vehicle owner cannot replace the tire pressure detector by himself, and the original tire pressure detector cannot work normally, so the new tire pressure detector cannot be replaced immediately. , tire pressure monitoring and measurement will be discontinuous, forming a loophole in safe driving.

The main purpose of the present invention is to calculate the angle localization by AOA (Angle of Arrival) localization method or AOD (Angle of Departure) localization method to obtain the final position information. To provide a signal transmission/reception angle localization method for a tire pressure monitoring system. Therefore, the existing radio signal receiving and transmitting device in the system can provide a method for realizing the localization of the tire and the tire pressure detector, and the tire pressure detector can be matched with the radio signal receiving and transmitting device one by one to input can reduce the time to

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, the tire pressure monitoring system comprises tire pressure detectors provided on the tires corresponding to the number of tires, and a receiving device. The tire pressure detector is provided with a transmitter and at least one transmitting antenna, the receiving device is provided with at least one receiving antenna for wireless communication with the transmitting antenna, and the signal receiving/transmitting angle is The steps of the stereotaxic method are:
a signal trigger step of triggering the transmitting antenna of the tire pressure detector to transmit a wireless signal;
a signal receiving step in which the receiving antenna of the receiving device receives the radio signal, and the direction in which the radio signal is transferred from the tire pressure detector to the receiving device is the linear distribution direction;
Calculate the included angle between the linear distribution direction and the intersection of the straight lines connecting any two transmit antennas, or calculate the included angle between the linear distribution direction and the intersection of the straight lines connecting any two receive antennas. an azimuth angle calculation step of calculating and calculating tire azimuth information according to the included angle;
characterized by comprising

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, the inclusion angle is calculated by the AOA localization method.

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, in the azimuth angle calculation step, the included angle at the intersection of the linear distribution direction and the straight line connecting any two receiving antennas is taken as the arrival angle, and the system When calculating the tire position information from the angle of arrival, the transmitter provided in each tire is provided with a transmitting antenna, the vehicle body is provided with a receiving device, and the receiving device has at least two receiving antennas are provided,

According to the signal receiving/transmitting angle localization method for tire pressure monitoring system according to the present invention, the method is characterized by calculating the included angle according to the AOD localization method.

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, in the azimuth angle calculation step, the included angle at the intersection of the linear distribution direction and the straight line connecting any two transmitting antennas is taken as the transmission angle, and the system When calculating tire position information from the transmission angle, at least two transmitting antennas are provided in the tire pressure detector provided in each tire, and a receiving device is provided in the vehicle body. and the receiving device is provided with a receiving antenna,

According to the signal receiving/transmitting angle localization method for tire pressure monitoring system according to the present invention, in the signal triggering step, the transmitter is actively triggered by tire rotation, and outputs a wireless signal after detecting tire pressure. characterized by

According to the signal receiving/transmitting angle localization method for tire pressure monitoring system according to the present invention, in the signal triggering step, the transmitter is triggered by receiving the signal output from the device, detects the tire pressure, and then wirelessly It is characterized by outputting a signal.

According to the signal receiving/transmitting angular localization method for a tire pressure monitoring system according to the present invention, the wireless signal includes a tire pressure value and a tire temperature value.

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, in the azimuth angle calculation step, the included angle is calculated and obtained by the receiving device or each tire pressure detector.

According to the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, the angle localization is calculated by the AOA (Angle of Arrival) localization method or the AOD (Angle of Departure) localization method. to obtain the final position information, which provides a way to realize the localization of the tire and the tire pressure detector by the existing radio signal receiving and transmitting device in the system, and the tire pressure detector is There is an effect that the input time can be shortened by matching with the radio signal receiving/transmitting device one by one.

1 shows the architecture of a tire pressure monitoring system according to the present invention; FIG. 4 is a flow chart showing the steps of a method for angular localization of signals for a tire pressure monitoring system according to the present invention; Fig. 3 shows the process of steps of an embodiment of the method according to the invention; FIG. 2 is a diagram showing the architecture of a system in which the present invention calculates the angle of a transmitter to a receiver according to the AOA localization method; FIG. 4 is a diagram showing a configuration of installing an antenna according to the AOA localization method of the present invention; FIG. 4 is a diagram of calculating an angle according to the AOA localization method of the present invention; Fig. 2 shows the architecture of the system in which the present invention calculates the angle of the transmitter to the receiver by the AOD localization method; FIG. 4 is a diagram showing a configuration of installing an antenna according to the AOD localization method of the present invention; FIG. 4 is a diagram of calculating an angle according to the AOD localization method of the present invention; 1 is a diagram showing that a receiving device according to the present invention is provided in a four-wheeled vehicle body and positioned in a driver's seat; FIG. 1 is a diagram showing that a receiving device according to the present invention is provided in a four-wheeled vehicle body and positioned in a front passenger's seat; FIG. FIG. 2 is a diagram showing that a receiving device according to the present invention is provided on a six-wheeled vehicle body and positioned inside the left front wheel; FIG. 2 is a diagram showing that a receiving device according to the present invention is provided on a two-wheeled vehicle body and positioned behind the front wheels;

An embodiment of the method according to the invention will now be described with reference to FIGS.
Starting with Bluetooth® 5.1, a direction finding mechanism is introduced into the protocol. Many antenna Bluetooth receivers measure the phase of the Bluetooth broadcast signal at two or more antennas to estimate the angle or direction of the Bluetooth transmitter. The receiver quickly switches between predefined antenna arrays to measure the phase shift caused by small differences in radio wave path lengths to different antennas. This is called the phase difference and provides direction finding of the transmitted signal.

In addition, in the embodiment of the present invention, the purpose of detecting the direction of the transmitted signal is achieved by wireless communication between multiple antenna receiving devices and the transmitter through Bluetooth or radio frequency (315MHz or 433MHz). . Also, many antenna receivers are receivers having two or more (including two) antennas.

The tire pressure monitoring system according to the present invention is attached to a vehicle body 10 having tires and is used to detect numerical values such as tire pressure and temperature at any time. Risk exposure can be avoided. Shown in FIG. 1 is a vehicle body 10 provided with four tires 11 . A tire pressure monitoring system according to the present invention includes a tire pressure detector 20 and a receiver 30 (Receiver). The number of tire pressure detectors 20 corresponds to the number of tires 11, ie in each tire 11 there is a respective tire pressure detector 20 mounted. Each tire pressure detector 20 comprises a transmitter 21 (Transmit) and a transmitting antenna 22 (see FIGS. 5 and 8) connected to the transmitter 21 . A receiving antenna 31 is connected to the receiving device 30 . By connecting the tire pressure detector 20 and the receiving device 30 via wireless communication between the transmitting antenna 22 and the receiving antenna 31, tire pressure information including tire pressure and temperature is output to the receiving device 30. do.

Please refer to FIGS. 1, 4 and 7. FIG. The upper side of the drawing is the front side of the vehicle body 10 , and the lower side of the drawing is the rear side of the vehicle body 10 . As shown in FIGS. 4 and 7, the vehicle body 10 is provided with a tire 11A (front right wheel), a tire 11B (front left wheel), a tire 11C (rear right wheel), and a tire 11D (rear left wheel). The system is provided in the order of transmitter 21A, transmitter 21B, transmitter 21C, and transmitter 21D corresponding to tires 11A to 11D. As shown in FIG. 1 , the receiving device 30 receives the radio signal output from the transmitter 21 to the transmitting antenna 22 through the receiving antenna 31 . The direction in which the wireless signal is transferred from the tire pressure detector 20 (transmitter 21) to the receiver 30 is defined as a linear distribution direction SD, and as shown in FIGS. The order of the radio signals in between is linear distribution direction SD1, linear distribution direction SD2, linear distribution direction SD3 and linear distribution direction SD4. In addition, in the signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention, the linear distribution direction is the linear distribution direction between the transmitter 21 and the receiver 30, so the linear distribution direction is Furthermore, the radio signal is not limited to one-way delivery, including the delivery direction from the receiving device 30 to the transmitter 21 .

Please refer to FIGS. 2, 5 and 8. FIG. A signal receiving/transmitting angle localization method for a tire pressure monitoring system according to the present invention includes a signal triggering step S1, a signal receiving step S2, and an azimuth angle calculating step S3.

A signal triggering step S1 triggers the transmitting antenna 22 of the transmitter 21 to transmit a radio signal.

In the signal receiving step S2, the receiving antenna 31 of the receiving device 30 receives the radio signal. The direction in which the radio signal is transferred from the transmitter 21 to the receiver 30 is assumed to be a linear distribution direction SD.

The azimuth angle calculation step S3 calculates the included angle between the linear distribution direction SD and the intersection of a straight line connecting any two transmitting antennas 22, or connecting the linear distribution direction SD and any two receiving antennas 31. The included angle between the intersection of the straight lines is calculated, and the azimuth information of the tire 11 is calculated from the included angle.

The method according to the invention obtains the angle of the transmitter 21 with respect to the receiver 30 by calculation. Thereby, the direction of the corresponding tire 11 can be known. As shown in FIG. 2, the method according to the invention may optionally include a tire position calculation step S4. Thereby, a more accurate azimuth of the tire 11 can be known. On the other hand, as shown in FIG. 12, when the vehicle body 10 is a vehicle with six or more wheels (including six wheels), the transmitter 21 and By calculating the straight-line distance to the receiving device 30 , it is converted into information on the fixed point position of the tire 11 .

In the embodiment of the present invention, the tire pressure detector 20 is triggered by the rotation of the tire 11 to detect the tire pressure, and transmits the measured tire pressure information as a radio signal from the transmitter 21 to the transmission antenna 22 . to the receiving antenna 31 and received by the receiving device 30 . The tire pressure detector 20 is triggered to detect the tire pressure after receiving the command signal output from the receiver 30 through the transmitting antenna 22 and the transmitter 21, and to provide the measured tire pressure information. Return to the receiving device 30 .

Shown in FIG. 3 is a specific embodiment of the method according to the invention. In the signal triggering step S1, the receiving device 30 outputs a trigger command (localization notification command) to the transmitter 21 to trigger the tire pressure detector 20 to detect the tire pressure. Then, in a signal receiving step S2, the tire pressure detector 20 transmits a radio signal (including orientation and tire pressure information) via the transmitter 21 . After reception, the receiving device 30 uses the AOA (Angle of Arrival) localization method or the AOD (Angle of Departure) localization method to calculate the azimuth angle of the transmitter 21 for the receiving device 30 in step S3. Calculate the angle. Finally, in the tire position calculation step S4, the tire position is calculated based on the angle.

In addition, it is not easy to obtain the phase difference directly because the antenna of the receiving device continuously switches the received electromagnetic wave signal in the ON/OFF mode specified by the host. Therefore, the phase difference can be obtained by the method of sampling the IQ samples. A receiving device (receiver) is required to sample for each antenna signal alone, and samples sampled from the same input signal are "In-phase" (abbreviated I). and "Quadrature-phase" (abbreviation is Q), hence the term "IQ samples". In the specification of Bluetooth 5.1, the receiving device 30 switches the antennas (31A to 31D), acquires the IQ sample information of the transmission signal from the transmitter 21, and according to the IQ sample information, the transmission from the transmitter 21 A phase difference of signals arriving at different antennas of the receiving device 30 is calculated, and an angle of arrival is calculated according to the phase difference. The calculation of the phase difference is done in the base layer of the receiver 30 IC. For the IQ samples, the phase difference is calculated using the raw data received by the array antenna as I samples and the phase displacement π/2 as Q samples. Therefore, the phase difference ψ=−5√3π is directly calculated in the base layer of the IC of the receiver 30 .

More specifically, the hypothetical values are as follows.

In embodiments of the present invention, the algorithm can define the number of comparisons. For example, when calculating the angle of the transmitters 21 (four) of a four-wheeled vehicle with respect to the receiver 30 (one) by the AOA localization method, the receiver 30 calculates the number of transmitters 21 (the number of tires 11 and ) and is provided with four receiving antennas 31 which are array antennas. As shown in FIGS. 5 and 6, the receiving antennas 31 are antennas 31A, 31B, 31C, and 31D, respectively, according to the array arrangement order. Thus, by comparing the calculated angles of antennas 31B and 31C with the calculated angles of antennas 31A and 31C, the more array antennas, the more information can be compared, and thus the more calculated angles. be accurate.

4, 5 and 6 show the arrangement of the equipment of the system when the method according to the invention calculates the angle of the transmitter 21 to the receiver 30 by the AOA localization method.

Please refer to FIG. The tire pressure detector 20 has a transmitter 21 and a transmission antenna 22 . The transmitting antenna 22 is connected to the transmitter 21 and outputs radio signals. The receiving device 30 comprises at least two receiving antennas 31 , an antenna switching unit 32 , a receiver 33 and an AOA estimation unit 34 . The receiving antenna 31 is connected to the antenna switching unit 32 . A receiver 33 is connected between the antenna switching unit 32 and the AOA estimation unit 34 . Thereby, the receiving device 30 controls switching of the receiving antenna 31 via the antenna switching unit 32 and receives the radio signal output from the transmitting antenna 22 . After the radio signal is received by the receiving antenna 31, it is distributed to the receiver 33 via the antenna switching unit 32, and after signal reception is completed, the signal is distributed from the receiver 33 to the AOA estimation unit 34. , to estimate the angle of arrival.

More specifically, the method according to the present invention, in the AOA application example, requires only one antenna (transmitting antenna 22) to be attached to the transmitting end (transmitter 21), and the data packet (tire pressure information) periodically. It is necessary to attach two or more antennas (receiving antenna 31) to the receiving end (receiving device 30). This constitutes an array antenna. The antennas receive data packets transmitted from different transmitters 21 . When the signal from the transmitting end is received via the array antenna (receiving antenna 31), the receiving device 30 obtains the phase difference of the signal by each receiving antenna 31 in the array and calculates the angle of arrival (θ _AOA ) as Calculate again.

On the other hand, as shown in FIG. 4, in the AOA application example, the receiving device 30 receives the radio signal transmitted from the transmitter 21A by switching the array antenna (receiving antenna 31). Then, the angle of the radio signal with respect to the array antenna is calculated and converted into the direction of the transmitter 21A with respect to the receiver 30. By analogy with this, the directions of the transmitters 21B, 21C and 21D can be obtained, Then, the fixed point position of the tire 11 can be localized.

7, 8 and 9 show the arrangement of the equipment of the system when the method according to the invention calculates the angle of the transmitter 21 to the receiver 30 by the AOD localization method.

Please refer to FIG. The tire pressure detector 20 comprises a transmitter 21 , at least two transmitting antennas 22 and an antenna switching unit 23 . The antenna switching unit 23 is connected between the transmitter 21 and the transmitting antenna 22, and switches the antenna that outputs the radio signal. The receiving device 30 comprises a receiving antenna 31 , a receiver 33 and an AOD estimation unit 35 . Receiver 33 is connected between receive antenna 31 and AOD estimation unit 35 . Thereby, the tire pressure detector 20 controls the switching of the transmission antenna 22 that outputs the radio signal by the antenna switching unit 23 . Said radio signal is output to the transmitting antenna 22, then received by the receiving antenna 31 and delivered to the receiver 33 to complete signal reception, and finally delivered to the AOD estimation unit 35 for transmission angle estimation. I do.

More specifically, the method according to the present invention requires that, in the AOD application example, two or more antennas (transmitting antenna 22) be attached to the transmitting end (transmitter 21) to form an array antenna. , periodically transmits data packets (tire pressure information). Only one antenna (receiving antenna 31) is attached to the receiving end (receiving device 30). The array antenna at the transmitting end transmits data packets in order. The transmitting end includes the antenna transformation order architecture in a signal and transmits the signal to a receiving device. The receiving device 30 obtains the relative position of the tire pressure detector according to the angle.

On the other hand, as shown in FIG. 7, in the AOD application example, the method according to the present invention causes the transmitter 21A to switch the radio signal from the array antenna (transmitting antenna 22) and transmit it to the receiving device 30. The angle of the radio signal with respect to the array antenna is calculated, the angle is returned to the receiving device 30, and the direction of the transmitter 21A with respect to the receiving device 30 is converted. By such an analogy, the directions of the other transmitters 21B, 21C, 21D relative to the receiving device 30 can be obtained respectively, and the fixed point position of the tire 11 can be localized.

In an embodiment of the present invention, the angle of the radio signal to the antenna is calculated entirely by the receiving device or tire pressure detector in AOA or AOD applications.

In an embodiment of the present invention, the receiving device 30 may be a communication device fixed inside the vehicle body 10, or a mobile communication device (for example, mobile phone, tablet computer, laptop computer, etc.). FIG. 1 shows that the receiving device 30 of the system according to the invention is a stationary communication device mounted on a vehicle body 10 having four tires 11 and located inside the right front wheel. FIG. 10 shows that the receiving device 30 of the system according to the present invention is a mobile communication device, mounted on a vehicle body 10 having four tires 11 and located in the driver's seat. FIG. 11 shows that the receiving device 30 of the system according to the present invention is a mobile communication device, which is mounted on a vehicle body 10 having four wheels 11 and is located in the passenger compartment. Fig. 12 shows that the receiving device 30 of the system according to the present invention is a fixed communication device, with six tires 11 (two tires 11 in the front and two tires 11 in the rear left and right). ), and is positioned inside the left front wheel. FIG. 13 shows that the receiving device 30 of the system according to the invention is a fixed communication device or a mobile communication device, mounted on a vehicle body 10 with two tires 11 and behind the front wheels. To position. It should be noted that the method of installing the receiving device 30 of the system according to the present invention is not limited to the above embodiment, and the signal receiving/transmitting angle localization method for the tire pressure monitoring system according to the present invention has various numbers of tires. It can be applied to vehicles and automobiles, for example trucks with eight tires or automobiles with three tires.

10 vehicle body 11 tire 20 tire pressure detector 21 transmitter 22 transmitting antenna 23 antenna switching unit 30 receiving device 31 receiving antenna 32 antenna switching unit 33 receiver 34 AOA estimation unit SD linear distribution direction 11A tire 11B tire 11C tire 11D tire 21A Transmitter 21B Transmitter 21C Transmitter 21D Transmitter SD1 Linear distribution direction SD2 Linear distribution direction SD3 Linear distribution direction SD4 Linear distribution direction 31A Antenna 31B Antenna 31C Antenna 31D Antenna 22A Antenna 22B Antenna 22C Antenna 22D Antenna

Claims (10)

A tire pressure monitoring system comprises a plurality of tire pressure detectors provided on tires corresponding to the number of tires, and a receiving device, wherein each tire pressure detector includes a transmitter and at least one transmitter. An antenna is provided, and the receiving device is provided with a plurality of receiving antennas that perform wireless communication with the transmitting antenna, and the signal receiving/transmitting angle localization method includes:
a signal triggering step of triggering the transmitting antenna of the tire pressure detector to transmit a wireless signal;
a signal receiving step in which the receiving antenna of the receiving device receives the radio signal and the direction in which the radio signal is transferred from the tire pressure detector to the receiving device is set as a linear distribution direction;
An azimuth angle for calculating the position information of each tire according to the angle between the linear distribution direction and the intersection of the straight line connecting any two of the receiving antennas by the AOA localization method. a calculation step;
A signal receiving/transmitting angle localization method for a tire pressure monitoring system, comprising:

2. The signal transmission/reception angle localization method for a tire pressure monitoring system according to claim 1, wherein: In the azimuth angle calculation step, when the included angle at the intersection of the straight line connecting the linear distribution direction and any of the two receiving antennas is taken as an arrival angle, and the system calculates the tire position information based on the arrival angle. The transmitter provided in each tire is provided with the transmitting antenna, the receiving device is provided in the vehicle body, and the receiving device is provided with at least two receiving antennas. and
Thereby, the transmitting antenna of each transmitter is triggered at the set timing to output the radio signal, and the receiving device switches the receiving antennas at the set timing, and the order from the transmitting antenna is switched. so that the straight line connecting any of the two receiving antennas and the radio signal form a right-angled triangle, the formula

Signal receiving and transmitting angular localization method for air pressure monitoring system. A tire pressure monitoring system includes a plurality of tire pressure detectors provided on tires corresponding to the number of tires, and a receiver, wherein each tire pressure detector includes a transmitter and a plurality of transmitting antennas. and the receiving device is provided with at least one receiving antenna that performs wireless communication with the transmitting antenna, and the signal receiving/transmitting angle localization method includes:
a signal triggering step of triggering the transmitting antenna of the tire pressure detector to transmit a wireless signal;
a signal receiving step in which the receiving antenna of the receiving device receives the radio signal and the direction in which the radio signal is transferred from the tire pressure detector to the receiving device is set as a linear distribution direction;
An azimuth angle for calculating the position information of each tire according to the angle between the linear distribution direction and the intersection of the straight line connecting any two of the transmitting antennas by the AOD localization method. a calculation step;
A signal receiving/transmitting angle localization method for a tire pressure monitoring system, comprising:

5. The signal transmission/reception angle localization method for a tire pressure monitoring system according to claim 4, wherein: In the azimuth angle calculation step, a transmission angle is defined as an included angle at the intersection of a straight line connecting the linear distribution direction and any of the two transmission antennas, and the system calculates tire position information based on the transmission angle. at least two of the transmitting antennas are provided in the tire pressure detector provided in each tire, the receiving device is provided in the vehicle body, and the receiving device is provided with the receiving antenna is provided,
Thereby, the transmitting antennas of the respective transmitters are triggered at set timings to output the radio signals, and the receiving antennas of the receiving device are output in order from the transmitting antennas provided on different tires. A straight line connecting any of said two transmitting antennas provided on the same tire pressure detector and said radio signal form a right-angled triangle.

Signal receiving and transmitting angular localization method for tire pressure monitoring system. The tire according to claim 1 or 4 , characterized in that in the signal triggering step, the transmitter is actively triggered by tire rotation to output a wireless signal after detecting tire pressure. Signal receiving and transmitting angular localization method for air pressure monitoring system. 5. The method according to claim 1 or 4, wherein in the signal triggering step, the transmitter is triggered by receiving a signal output from a device to output a wireless signal after detecting tire pressure. A signal receiving/transmitting angular localization method for a tire pressure monitoring system as described. 5. The method of claim 1 or 4 , wherein the wireless signal includes a tire pressure value and a tire temperature value. 5. The signal receiving/transmitting device for a tire pressure monitoring system according to claim 1 or 4 , wherein in said azimuth angle calculation step, said included angle is calculated and obtained by said receiving device or each of said tire pressure detectors. Angular localization method.

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