TWI660865B - Positioning method of wireless tire pressure detection device, positionable wireless tire pressure detection device, and positionable wireless tire pressure detection system - Google Patents

Abstract

A positioning method of a wireless tire pressure detection device, the method includes: receiving a radial acceleration value and a linear acceleration value of a tire; calculating the radial acceleration value and the tangential acceleration value with a gravity acceleration value, To obtain a calculated value of the radial vector and a calculated value of all the line vectors; determine an operation state according to the increase or decrease of the calculated value of the radial vector and the calculated value of the tangent vector; determine whether the operation state is converted; when the operation is determined The state is changed to another operating state, and a position information of the tire is judged according to the switching order of the operating state.

Description

Positioning method of wireless tire pressure detection device and positionable wireless tire pressure detection Device and positionable wireless tire pressure detection system

This creation relates to a positioning method of a wireless tire pressure detection device, a positionable wireless tire pressure detection device, and a positionable wireless tire pressure detection system to determine the position of a tire installed in the wireless tire pressure detection device.

In vehicle driving, tire pressure is a very important factor in driving safety. If the tire pressure is insufficient, the contact area between the tire skin and the ground will increase, increasing the friction between the tire and the ground, which will increase fuel consumption and increase the engine load. In addition, the temperature of the air inside the tire will also rise, with the expansion of the air volume. The condition is not good, even in the case of a flat tire. Therefore, in order to enable the driver to grasp the tire pressure, in order to slow down the speed when he detects abnormal tire pressure while driving, and park the vehicle on the roadside to avoid traffic accidents, the existing wireless tire pressure detector can be installed on the tire of the vehicle. In the middle, the tire pressure of the tire is detected by the wireless tire pressure detector, and the detection result is transmitted to a receiving device (such as the dashboard of the driver's seat or a tire pressure display, etc.) for the driver to check the tire pressure status at any time.

Taking a four-wheeled car as an example, each of its four tires is equipped with a wireless tire pressure detector, which can be divided into two front wheels and two rear wheels, or two left wheels and two right wheels according to the orientation. The judgment method of the front and rear wheels is relatively easy. For example, because the front wheels are closer to the engine, generally, the tire temperature of the front wheels will be higher than the tire temperature of the rear wheels, so the receiving device can judge the wireless tires based on the tire temperature. The tires set by the pressure detector are front wheels or rear wheels. However, the tire temperature characteristics of the left and right wheels are similar. If it is impossible to directly determine whether the tire installed in the wireless tire pressure detector is a left tire or a right tire based on the tire temperature.

Therefore, the main purpose of this creation is to provide a positioning method of a wireless tire pressure detection device, which is used to distinguish whether the tire installed in the wireless tire pressure detection device is a left tire or a right tire.

The positioning method of the creative wireless tire pressure detection device includes: receiving a radial acceleration value and a linear acceleration value of a tire; calculating the radial acceleration value and the tangential acceleration value with a gravity acceleration value, respectively, and the The radial acceleration value and the tangential acceleration value are generated by an acceleration detection module and received by a controller; in order to obtain a calculated value of the radial vector and a calculated value of all line vectors, respectively; and the calculated value according to the radial vector An increase or decrease in the calculated value with the tangent vector determines an operation state; determines whether the operation state has changed; when it is determined that the operation state is converted to another operation state, judges a position information of the tire according to the sequence of the operation state conversion; The operation state includes a first operation state, a second operation state, a third operation state, and a fourth operation state; when the transition of the operation state is from the first operation state to the second operation state, and from the second operation The state is changed to the third operation state, the third operation state is changed to the fourth operation state, or the fourth operation state is changed to the first operation state. The operating state to determine that the position information is a first position; when the operating state is changed from the first operating state to the fourth operating state, from the fourth operating state to the third operating state, and from the third operating state to The second operation state or transition from the second operation state to the first operation state, and the position information is judged to be a second position relative to the first position; wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time , It is judged as the first operation state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is determined as the second operation state; when the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is determined as the third operation State; when the calculated value of the radial vector decreases and the calculated value of the tangent vector increases, it is judged as a fourth operating state.

Another purpose of this creation is to provide a wireless tire pressure detection device that can be positioned in a tire of a vehicle. The wireless tire pressure detection device includes: an acceleration detection module that detects the tire's A radial acceleration value and all linear acceleration values; a wireless transmission module; and a controller electrically connecting the acceleration detection module and the wireless transmission module, the controller connecting the radial acceleration value with the tangent The acceleration value is calculated with a gravitational acceleration value to obtain a radial vector calculation value and all line vector calculation values, respectively, and an operation state is determined according to the increase and decrease of the radial vector calculation value and the tangent vector calculation value; when The controller determines that the operation state is converted to another operation state, determines a position information of the tire according to a sequence of the operation state conversion, and transmits the position information to the outside through the wireless transmission module.

Another purpose of this creation is to provide a positionable wireless tire pressure detection system, including: a plurality of wireless tire pressure detection devices, which are respectively provided in a plurality of tires of a vehicle, and each wireless tire pressure detection device includes a An acceleration detection module and a wireless transmission module. The acceleration detection module detects a radial acceleration value and all linear acceleration values of the tire, and is transmitted by the wireless transmission module. A receiving device is provided for A wireless transmission module of the plurality of wireless tire pressure detection devices is connected to the vehicle, and the receiving device calculates a radial acceleration value and a tangential acceleration value of each wireless tire pressure detection device with a gravity acceleration value, respectively. A calculated value of the radial vector and a calculated value of all the line vectors are obtained, and an operation state is determined according to the increase and decrease of the calculated value of the radial vector and the calculated value of the tangent vector; when the receiving device determines each wireless tire pressure detection device The operation state of the vehicle is converted into another operation state, and a position information of each tire is determined according to the sequence of the operation state conversion; the operation state includes a first operation state A second operating state, a third and a fourth operation state of the operation state; when the reception means judged that the operation state is converted from a first state to a second operating state operation State, transition from the second operation state to the third operation state, from the third operation state to the fourth operation state, or from the fourth operation state to the first operation state, determine that the position information is a first position; when the The receiving device determines that the transition of the operation state is from the first operation state to the fourth operation state, from the fourth operation state to the third operation state, from the third operation state to the second operation state, or from the second operation state. When converted to the first operation state, it is determined that the position information is a second position relative to the first position; wherein when the calculated value of the radial vector and the calculated value of the tangent vector are increased at the same time, it is determined to be the first operation state; When the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is judged as the second operation state; when the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is judged as the third operation state; when the calculated value of the radial vector decreases The calculated value of the tangent vector is increased, and it is determined as the fourth operation state.

Another purpose of this creation is to provide a method for locating a wireless tire pressure detection system, including: through a plurality of wireless tire pressure detection devices each including an acceleration detection module and a wireless transmission module, the acceleration detection The module detects a radial acceleration value and all linear acceleration values of a tire, and is transmitted externally by the wireless transmission module for reception by a receiving device; the radial acceleration value and the tangential acceleration are received by the receiving device. The values are respectively calculated with a gravity acceleration value to obtain a calculated value of a radial vector and a calculated value of all line vectors, respectively; an operation state is determined according to the increase or decrease of the calculated value of the radial vector and the calculated value of the tangent vector; the operation is determined; Whether the state has changed; when the receiving device determines that the operating state of each wireless tire pressure detection device has been changed to another operating state, a position information of the tire is determined according to the order of the operating state transition; the operating state includes a first An operating state, a second operating state, a third operating state, and a fourth operating state; When the receiving device determines that the transition of the operation state is from the first operation state to the second operation state, the second operation state to the third operation state, the third operation state to the fourth operation state, or the fourth operation state When the operation state is changed to the first operation state, the position information is determined to be a first position; when the receiving device determines that the operation state is changed from the first operation state to the fourth operation state, and from the fourth operation state to the first position, Three operation states, transition from a third operation state to a second operation state, or a transition from a second operation state to a first operation state, determine that the position information is a second position relative to the first position; where: when the path When the calculated value of the direction vector and the calculated value of the tangent vector increase at the same time, it is judged as the first operation state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is judged as the second operation state; when the calculated value of the radial vector and the tangent line When the calculated value of the vector decreases at the same time, it is judged as the third operation state. When the calculated value of the radial vector is decreased and the calculated value of the tangent vector is increased, it is judged as the fourth operation state. For the state.

This creation mainly uses the calculation of the radial acceleration value, tangential acceleration value, and gravity acceleration value, and determines the sequence of the operation state to determine whether the position information of the wireless tire pressure detection device belongs to the left tire or the right tire. By further combining the judgment results of the front and rear wheels described in the prior art, it can be accurately determined whether each wireless tire pressure detection device is installed on the left front wheel, the left rear wheel, the right front wheel, or the right rear wheel. The following examples are used to illustrate this creation to make the scope of the requested creation clearer.

100‧‧‧Wireless tire pressure detection device

200‧‧‧ receiving device

101‧‧‧Wireless tire pressure detection device on the left

102‧‧‧Wireless tire pressure detection device on the right

10‧‧‧Acceleration detection module

11‧‧‧Acceleration detection module

12‧‧‧Acceleration detection module

20‧‧‧Wireless transmission module

30‧‧‧controller

40‧‧‧tire

41‧‧‧Motion Path

51‧‧‧Left tire

52‧‧‧Right tire

60‧‧‧ Vehicle

Figure 1: Schematic circuit block diagram of the wireless tire pressure detection device of this creation.

Figure 2: Schematic diagram of the acceleration detection module in this creation.

Figure 3: Schematic diagram of the use of the acceleration detection module in this creation.

Figure 4: Schematic diagram of the use status of this creative wireless tire pressure detection device.

Figure 5: Schematic diagram of the installation of a wireless tire pressure detection device on a vehicle.

Fig. 6A: A schematic diagram of the use state of the acceleration detection module of the left tire in this creation (1).

Figure 6B: Schematic diagram of the use state of the acceleration detection module of the left tire in this creation (2).

Fig. 6C: A schematic diagram of the use state of the acceleration detection module of the left tire in this creation (3).

Figure 6D: A schematic diagram of the use state of the acceleration detection module of the left tire in this creation (4).

Figure 7: A schematic diagram of the waveforms of the calculated radial vector and tangent vector of the left tire.

Fig. 8A: A schematic diagram of the use state of the acceleration detection module of the right tire in this creation (1).

Figure 8B: A schematic diagram of the use state of the acceleration detection module of the right tire in this creation (2).

Fig. 8C: A schematic diagram of the use state of the acceleration detection module of the right tire in this creation (3).

Figure 8D: A schematic diagram of the usage status of the acceleration detection module of the right tire in this creation (4).

Figure 9: A schematic diagram of the waveforms of the calculated radial vector and tangent vector for the right tire.

This creative wireless tire pressure detection device is intended to be installed in the tire of a vehicle. Please refer to FIG. 1. This creative wireless tire pressure detection device 100 includes an acceleration detection module 10, a wireless transmission module 20 and One controller 30.

The acceleration detection module 10 may be a gravity acceleration detection module (G-sensor), which includes a circuit board and an acceleration detection integrated circuit (IC) provided on the circuit board to detect a plurality of axes. Acceleration value. In this preferred embodiment, please refer to FIG. 2. The axial direction includes the x-axis and the z-axis of the three-dimensional space coordinate. When the acceleration detection module 10 moves, an x-axis acceleration value and a z-axis are correspondingly generated. The acceleration value, the y-axis is the rotation axis of the tire. Please refer to FIG. 3 because the acceleration detection module 10 is installed in the tire 40. When the tire 40 rotates, the acceleration detection module 10 follows a generally circular motion path. When the axis 41 moves, the x-axis acceleration value is equal to all linear acceleration values ax when the acceleration detection module 10 moves along the motion path 41, and the z-axis acceleration value is equal to a radial acceleration value az.

The controller 30 is electrically connected to the acceleration detection module 10 and the wireless transmission module 20. The controller 30 stores a gravity acceleration value g as a preset value. After the controller 30 receives the tangential acceleration value ax and the radial acceleration value az from the acceleration detection module 10, it calculates the tangential acceleration value ax, the radial acceleration value az, and the gravity acceleration value g respectively to obtain The calculated value of all the line vectors and the calculated value of a radial vector, and the radial acceleration value az and the tangential acceleration value ax are generated by an acceleration detection module 10 and received by the controller 30; and according to the tangent The increase or decrease of the calculated value of the vector and the calculated value of the radial vector is defined as an operation state among a plurality of operation states, and it is determined whether the operation state is switched. The plural operation states of this creation include a first operation state, a second operation state, a third operation state, and a fourth operation state, as shown in the following table:

For example, the tire set in this creative wireless tire pressure detection device is a 15-inch tire. When the tire rotates once, it is equivalent to moving the ground 1.9 meters. Assuming that the vehicle travels at a speed of 30 kilometers per hour, it is equivalent. At 8.3 meters per second, the time required for a tire to make one full revolution is approximately 228 milliseconds (ms). If the sampling frequency of the tangential acceleration value ax and the radial acceleration value az of the acceleration detection module 10 is 125 Hz (that is, the sampling frequency is every 8 milliseconds), 28 tangential acceleration values ax can be detected after one revolution of the tire. And the radial acceleration value az for the controller 30 to calculate the tangent vector calculation value and the radial vector calculation value. After calculating the calculated value of the tangent vector and the calculated value of the radial vector, the controller 30 compares two adjacent ones. Whether the calculated value of the tangent vector of the sub-sampling increases or decreases, and whether the calculated value of the radial vector of two consecutive samples is increased or decreased at the same time, thereby defining the aforementioned operating state.

When the controller 30 determines that the operation state is converted to another operation state, it determines a position information according to the sequence of the operation state conversion. In this preferred embodiment, when it is determined that the transition of the operation state is from the first operation state to the second operation state, from the second operation state to the third operation state, and from the third operation state to the fourth operation state. When the fourth operation state is changed to the first operation state, the position information may be judged to be a first position. In addition, when the controller 30 determines that the operation state is changed from the first operation state to the fourth operation state . From the fourth operation state to the third operation state, from the third operation state to the second operation state, or from the second operation state to the first operation state, it can be determined that the position information is relative to the first position. A second position. Wherein, when the first position is the left tire of the vehicle, the second position is the right tire; conversely, when the first position is the right tire of the vehicle, the second position is the left tire.

In the following description, please refer to FIG. 4 and FIG. 5. The first and second positions respectively take the left and right tires 51 and 52 as examples. Generally speaking, the left and right wireless tire pressure detection devices 101 and 102 are opposite in the front and rear directions. When the vehicle 60 moves forward, the wireless tire pressure detection devices 101 and 102 follow the tires. 51, 52 rotate and move along their respective motion paths.

First, the left-side wireless tire pressure detection device 101 is taken as an example, and for convenience of explanation, only the first to fourth positions P1 to P4 are described. Please refer to FIG. 6A. When the acceleration detection module 11 is located at the first position P1 (that is, directly above the delivery tire), the radial acceleration value az and the gravity acceleration value g are in opposite directions to each other. The gravity acceleration value g is subtracted from the radial acceleration value az to obtain a radial vector calculation value (g-az); please refer to FIG. 6B. When the acceleration detection module 11 is located at the second position P2, the radial direction The z-axis component of the acceleration value az is 0, so the magnitude of the calculated value of the radial vector is g; please refer to FIG. 6C. When the acceleration detection module 11 is located at the third position P3, the radial acceleration value az and gravity The acceleration values g are in the same direction as each other, and the controller 30 adds the gravitational acceleration value g to the radial acceleration value az. Size to obtain the calculated value of the radial vector (g + az); please refer to FIG. 6D, when the acceleration detection module 11 is located at the fourth position P4, the z-axis component of the radial acceleration value az is 0, so the diameter The magnitude of the calculated value to the vector is g. Therefore, whenever the left tire 51 rotates once, the acceleration detection module 11 of the left wireless tire pressure detection device 101 starts from the first position P1, passes through the second to fourth positions P2 to P4 in order, and then returns to The first position P1, please refer to FIG. 7, the calculated value of the radial vector is sequentially increased from the minimum value (g-az) to the intermediate value g, from the intermediate value g to the maximum value (g + az), and from the maximum value. The value (g + az) is reduced to the intermediate value g, and from the intermediate value g to the minimum value (g-az).

As for the calculated value of the tangent vector, please refer to FIG. 6A. When the acceleration detection module 11 is located at the first position P1, the z-axis component of the tangent acceleration value ax is 0, so the magnitude of the calculated value of the tangent vector is g; please Referring to FIG. 6B, when the acceleration detection module 11 is located at the second position P2, the tangential acceleration value ax and the gravity acceleration value g are in the same direction with each other, and the controller 30 adds the gravity acceleration value g to the tangential acceleration value. The size of ax to obtain the calculated value of the tangent vector (g + ax); please refer to FIG. 6C. When the acceleration detection module 11 is located at the third position P3, the z-axis component of the tangent acceleration value ax is 0, so the tangent The magnitude of the vector calculation value is g; please refer to FIG. 6D. When the acceleration detection module 11 is located at the fourth position P4, the tangential acceleration value ax and the gravity acceleration value g are in opposite directions to each other. The controller 30 applies the gravity The magnitude of the tangential acceleration value ax is subtracted from the acceleration value g to obtain a tangent vector calculation value (g-ax). Whenever the left tire 51 makes one turn, please refer to FIG. 7. The calculated value of the tangent vector is sequentially increased from the intermediate value g to the maximum value (g + ax) and decreased from the maximum value (g + ax) to the intermediate value g. , Decrease from the intermediate value to the minimum value (g-ax), and increase from the minimum value (g-ax) to the intermediate value g.

Therefore, in the process of the acceleration detection module 11 moving from the first position P1 to the second position P2, the calculated value of the radial vector and the calculated value of the tangent vector are increased at the same time, corresponding to the first operating state in the table above; In the process of the acceleration detection module 11 moving from the second position P2 to the third position P3, the calculated value of the radial vector is increased and the calculated value of the tangent vector is decreased, corresponding to the second operation shown in the table above. State; in the process of the acceleration detection module 11 moving from the third position P3 to the fourth position P4, The calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, corresponding to the third operating state shown in the table above. During the movement of the acceleration detection module 11 from the fourth position P4 to the first position P1, the radial direction The calculated value of the vector decreases and the calculated value of the tangent vector increases, corresponding to the fourth operating state shown in the table above.

In this way, when the controller 30 determines that the acceleration detection module 11 transitions from the first operation state to the second operation state, from the second operation state to the third operation state, and from the third operation state to the third operation state, When the four operation states or the fourth operation state is changed to the first operation state, it can be determined that the acceleration detection module 11 belongs to the left wireless tire pressure detection device 101, and the installed tire is the left tire 51.

As for the right-side wireless tire pressure detection device 102, the calculation method of the radial vector calculation value is the same as that of the left-side wireless tire pressure detection device 101, and details are not described herein. Please refer to FIGS. 8A to 8D. When the acceleration detection module 12 of the right wireless tire pressure detection device 102 is located at the first to fourth positions Q1 to Q4, the magnitudes of the calculated values of the radial vectors are g-az, g, g + az and g. As for the tangent vector calculation value, because the installation direction of the right wireless tire pressure detection device 102 is opposite to that of the left wireless tire pressure detection device 101, please refer to FIG. 8A. When the acceleration detection module 12 is located at the first position Q1 When the z-axis component of the tangent acceleration value ax is 0, the magnitude of the calculated value of the tangent vector is g; please refer to FIG. 8B. When the acceleration detection module 12 is located at the second position Q2, the tangential acceleration value ax The gravity acceleration value g is opposite to each other. The controller 30 subtracts the tangential acceleration value ax from the gravity acceleration value g to obtain a tangent vector calculation value (g-ax). Please refer to FIG. 8C. When the measurement module 12 is located at the third position Q3, the z-axis component of the tangent acceleration value ax is 0, so the magnitude of the calculated value of the tangent vector is g; please refer to FIG. 8D, when the acceleration detection module 12 is located at the fourth At position Q4, the tangential acceleration value ax and the gravitational acceleration value g are in the same direction with each other, and the controller 30 adds the gravitational acceleration value g to the magnitude of the tangential acceleration value ax to obtain a tangent vector calculation value (g + ax), Whenever the right tire 52 makes one revolution, the The calculated value of the tangent vector is sequentially reduced from the intermediate value g to the minimum value (g-ax), from the minimum value (g-ax) to the intermediate value g, from the intermediate value g to the maximum value (g + ax), and from the maximum The value (g + ax) is reduced to the intermediate value g.

Yes. During the movement of the acceleration detection module 12 from the first position Q1 to the second position Q2, the calculated value of the radial vector is increased and the calculated value of the tangent vector is decreased, corresponding to the second operating state shown in the table above; In the process of the acceleration detection module 12 moving from the second position Q2 to the third position Q3, the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time, corresponding to the first operating state in the table above; During the acceleration detection module 12 moving from the third position Q3 to the fourth position Q4, the calculated value of the radial vector decreases and the calculated value of the tangent vector increases, corresponding to the fourth operating state shown in the table above. During the movement of the measurement module 12 from the fourth position Q4 to the first position Q1, the calculated value of the radial vector and the calculated value of the tangent vector decrease simultaneously, corresponding to the third operating state shown in the table above.

As such, when the controller 30 determines that the acceleration detection module 12 transitions from the first operation state to the fourth operation state, from the fourth operation state to the third operation state, and from the third operation state to the third operation state, When the second operation state or the second operation state is changed to the first operation state, it can be determined that the acceleration detection module 12 belongs to the right wireless tire pressure detection device 102 and the installed tire is the right tire 52.

The main function of the wireless tire pressure detection device 100 is to detect the tire pressure information of the tire. Please refer to FIG. 1 and FIG. 5. When the controller 30 determines the position information of the wireless tire pressure detection device 100, The combined position information is transmitted to a receiving device 200 provided in the vehicle 60 through the wireless transmission module, and the receiving device 200 can distinguish the tire pressure information of the left tire 51 and the tire pressure information of the right tire 52 according to the location information.

This creation also provides a wireless tire pressure detection system. Figure 5 is an example. The system includes a plurality of wireless tire pressure detection devices 101 and 102 and a receiving device 200. Each wireless tire pressure detection device 101 and 102 includes FIG. The acceleration detection module 10 and the wireless transmission module 20 are shown. As mentioned above, the acceleration detection module 10 is responsible for detecting the tangential acceleration value ax and the radial acceleration value az of the tire. The wireless transmission module 20 Responsible for transmitting the tangential acceleration value ax and the radial acceleration value az to the receiving device 200. When the receiving device 200 receives the tangential acceleration value transmitted from each wireless tire pressure detecting device 101, 102 After the ax and the radial acceleration value az, the receiving device 200 judges the position information of each of the line tire pressure detecting devices 101 and 102 according to the above table and the order of operation state conversion.

The positioning method of the wireless tire pressure detection system described above is described as follows: Through a plurality of wireless tire pressure detection devices 101 and 102 each including an acceleration detection module 10 and a wireless transmission module 20, the acceleration detection The measurement modules 101 and 102 detect a radial acceleration value az and all linear acceleration values ax of a tire 40, and are transmitted externally by the wireless transmission module 20 for reception by a receiving device 200; through the receiving device 200 Calculate the radial acceleration value az and the tangential acceleration value ax with a gravitational acceleration value g, respectively, to obtain a radial vector calculation value and a calculation value of all line vectors; respectively, based on the radial vector calculation value and the tangent vector calculation The increase or decrease of the value determines an operating state; determines whether the operating state has changed; when the receiving device 200 determines that the operating state of each wireless tire pressure detection device 101, 102 is switched to another operating state, according to the switching of the operating state Sequentially determine a position information of the tire; the operation state includes a first operation state, a second operation state, a third operation state, and a fourth operation State; when the receiving device 200 determines that the operation state transition is from the first operation state to the second operation state, from the second operation state to the third operation state, from the third operation state to the fourth operation state, or Transition from the fourth operation state to the first operation state, and determine that the position information is a first position; when the receiving device 200 determines that the transition of the operation state is from the first operation state to the fourth operation state, and from the fourth operation The state is changed to the third operation state, the third operation state is changed to the second operation state, or the second operation state is changed to the first operation state, and the position information is determined to be a second position relative to the first position; Wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time, it is judged as the first operation state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is judged as the second operation state; When the calculated value of the vector and the calculated value of the tangent vector decrease at the same time, it is determined as the third operation state; when the calculated value of the radial vector decreases and the calculated value of the tangent vector increases, it is determined as the fourth operation state; the receiving device 200 according to the above table and operation The state transition order judges the position information of each line tire pressure detection device 101, 102.

Claims (9)

A positioning method of a wireless tire pressure detection device includes: receiving a radial acceleration value and a linear acceleration value of a tire; calculating the radial acceleration value and the tangential acceleration value with a gravity acceleration value, and the The radial acceleration value and the tangential acceleration value are generated by an acceleration detection module and received by a controller; in order to obtain a calculated value of the radial vector and a calculated value of all line vectors, respectively; and the calculated value according to the radial vector An increase or decrease in the calculated value with the tangent vector determines an operation state; determines whether the operation state has changed; when it is determined that the operation state is converted to another operation state, judges a position information of the tire according to the sequence of the operation state conversion; The operation state includes a first operation state, a second operation state, a third operation state, and a fourth operation state; when the transition of the operation state is from the first operation state to the second operation state, and from the second operation The state is changed to the third operation state, the third operation state is changed to the fourth operation state, or the fourth operation state is changed to the first operation state. The operating state to determine that the position information is a first position; when the operating state is changed from the first operating state to the fourth operating state, from the fourth operating state to the third operating state, and from the third operating state to The second operation state or transition from the second operation state to the first operation state, and the position information is judged to be a second position relative to the first position; wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time , It is judged as the first operation state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is determined as the second operation state; when the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is determined as the third operation State; when the calculated value of the radial vector decreases and the calculated value of the tangent vector increases, it is judged as a fourth operating state. The positioning method of the wireless tire pressure detection device according to claim 1, wherein the first position is a left tire of the vehicle, and the second position is a right tire of the vehicle. A positionable wireless tire pressure detection device is provided in a tire of a vehicle. The wireless tire pressure detection device includes an acceleration detection module that detects a radial acceleration value and all lines of the tire. Acceleration value; a wireless transmission module; and a controller that electrically connects the acceleration detection module and the wireless transmission module, the controller separately sets the radial acceleration value and the tangential acceleration value with a gravity acceleration value Perform operations to obtain a calculated value of the radial vector and a calculated value of all the line vectors, and determine an operating state according to the increase or decrease of the calculated value of the radial vector and the calculated value of the tangent vector; when the controller determines the operating state When it is converted into another operation state, a position information of the tire is judged according to the conversion order of the operation state, and the position information is transmitted to the outside through the wireless transmission module. The positionable wireless tire pressure detection device according to claim 3, wherein the operation states include a first operation state, a second operation state, a third operation state, and a fourth operation state; when the controller determines The operation state is changed from the first operation state to the second operation state, from the second operation state to the third operation state, from the third operation state to the fourth operation state, or from the fourth operation state to the first operation state. An operation state, determining that the position information is a first position; when the controller determines that the transition of the operation state is from the first operation state to the fourth operation state, from the fourth operation state to the third operation state, The third operation state is changed to the second operation state or from the second operation state to the first operation state, and it is determined that the position information is a second position relative to the first position. The positionable wireless tire pressure detection device according to claim 4, wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time, it is determined as the first operation state; when the calculated value of the radial vector increases, the tangent When the calculated value of the vector decreases, it is judged as the second operating state; when the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is judged as the third operating state; when the calculated value of the radial vector decreases and the calculated value of the tangent vector increases, judge It is the fourth operation state. The positionable wireless tire pressure detection device according to claim 4 or 5, wherein the first position is a left tire of the vehicle, and the second position is a right tire of the vehicle. A positionable wireless tire pressure detection system includes a plurality of wireless tire pressure detection devices respectively provided in a plurality of tires of a vehicle. Each wireless tire pressure detection device includes an acceleration detection module and a wireless Transmission module, the acceleration detection module detects a radial acceleration value and all linear acceleration values of the tire, and is transmitted externally by the wireless transmission module; a receiving device is provided in the vehicle and is connected to the plurality A wireless transmission module of a wireless tire pressure detection device. The receiving device calculates a radial acceleration value and a tangential acceleration value of each wireless tire pressure detection device with a gravity acceleration value respectively to obtain a radial vector calculation value. And the calculated value of the line vector, and an operation state is determined according to the increase or decrease of the calculated value of the radial vector and the calculated value of the tangent vector; when the receiving device determines that the operation state of each wireless tire pressure detection device is switched to another operation Status, judging a position information of each tire according to the conversion order of the operating status; the operating status includes a first operating status, a second operating status, a first An operating state and a fourth operating state; when the receiving device determines that the transition of the operating state is from the first operating state to the second operating state, from the second operating state to the third operating state, and from the third operating state It is the fourth operation state or is converted from the fourth operation state to the first operation state, and the position information is determined to be a first position; when the receiving device determines that the operation state transition is from the first operation state to the fourth operation state , From the fourth operation state to the third operation state, from the third operation state to the second operation state, or from the second operation state to the first operation state, determine that the position information is a relative to the first position The second position; wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time, it is determined as the first operation state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is determined as the second operation state; When the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is determined as the third operation state; when the calculated value of the radial vector decreases, the Vector calculation value increases, it is determined that the fourth operating state. The positionable wireless tire pressure detection system according to claim 7, wherein the first position is a left tire of the vehicle, and the second position is a right tire of the vehicle. A method for locating a wireless tire pressure detection system includes: through a plurality of wireless tire pressure detection devices each including an acceleration detection module and a wireless transmission module, the acceleration detection module detects one of a tire The radial acceleration value and all linear acceleration values are externally transmitted by the wireless transmission module and received by a receiving device; the radial acceleration value and the tangential acceleration value are respectively performed with a gravity acceleration value through the receiving device. Operations to obtain a calculated value of the radial vector and a calculated value of all the line vectors; determine an operation state according to the increase or decrease of the calculated value of the radial vector and the calculated value of the tangent vector; determine whether the operation state is converted; The device determines that the operation state of each wireless tire pressure detection device is converted to another operation state, and judges a position information of the tire according to the order of the operation state conversion; the operation state includes a first operation state and a second operation state A third operation state and a fourth operation state; when the receiving device determines that the transition of the operation state is from the first operation state The state is changed to the second operation state, the second operation state to the third operation state, the third operation state to the fourth operation state, or the fourth operation state to the first operation state, and the position information is judged to be one. First position; when the receiving device determines that the transition of the operating state is from the first operating state to the fourth operating state, from the fourth operating state to the third operating state, and from the third operating state to the second operating state Or the second operation state is changed to the first operation state, and the position information is judged to be a second position relative to the first position; wherein: when the calculated value of the radial vector and the calculated value of the tangent vector increase at the same time, it is judged as the first position An operating state; when the calculated value of the radial vector increases and the calculated value of the tangent vector decreases, it is judged as the second operating state; when the calculated value of the radial vector and the calculated value of the tangent vector decrease at the same time, it is judged as the third operating state; The calculation value of the radial vector decreases and the calculation value of the tangent vector increases, and it is determined that the fourth operation state.