KR102163795B1 - System and method for identifying pneumatic sensor of vehicle and control apparatus therefor - Google Patents

Abstract

The present invention relates to a method for identifying an air pressure sensor of an own vehicle and a control device therefor, and a control device for identifying an air pressure sensor according to an embodiment of the present invention includes an air pressure sensor provided in a tire of an own vehicle or another vehicle to measure the air pressure. Receives an RF signal, and identifies whether the air pressure sensor is a sensor provided in the tire of the own vehicle according to whether or not the air pressure sensor satisfies the filtering condition, but the air pressure sensor determines the filtering condition by using at least one of sensor ID, RSSI, and Count information. You can judge whether you are satisfied or not.

Description

A method of identifying the air pressure sensor of the own vehicle, and a control device therefor TECHNICAL FIELD {SYSTEM AND METHOD FOR IDENTIFYING PNEUMATIC SENSOR OF VEHICLE AND CONTROL APPARATUS THEREFOR}

The present invention relates to a method for identifying an air pressure sensor of an own vehicle and a control device therefor, and more particularly, whether the data received from the air pressure sensor provided in the tire is filtered according to a certain condition and whether the signal is received from a sensor provided in the own vehicle. It relates to a method for determining the and a control device therefor.

The tire pressure monitoring system is a technology for preventing accidents due to tire defects by detecting the tire pressure in real time and notifying the user. The tire air pressure monitoring system includes an air pressure sensor in each tire, and the main controller detects the condition of the tire in real time by receiving a signal including measurement data from each sensor.

However, since the signal received from the sensor by the main controller is generally a wireless signal, as shown in Fig. 1, when there is another vehicle driving adjacent to the own vehicle, the main controller provided in the host vehicle also signals from the sensor of the other vehicle. There is a possibility to receive. Therefore, there is a need for a technology to identify whether the received signal is a signal transmitted from a sensor of the own vehicle or a sensor of another vehicle.

In the related art, it was determined whether or not the main controller received a signal from a sensor of the own vehicle using the number of times the signal was received from each sensor. However, in the case of judging based only on the number of signals received as described above, if another vehicle travels in proximity for a certain time or longer, or a truck with a large number of tires travels in proximity, it is still receiving signals from the sensors of other vehicles. There is room for errors in judgment.

Therefore, there is a need for a technology capable of accurately identifying whether a signal received from a specific sensor is received from a sensor provided in a tire of a host vehicle or a sensor provided in a tire of another vehicle. The present invention relates to this.

Republic of Korea Patent Publication No. 10-1326027 (2013.10.28)

The present invention was conceived to solve the above problems, in a tire air pressure monitoring system, providing a system, method, and apparatus for accurately identifying whether the signal is a signal received from a sensor provided in a tire of a host vehicle. It is aimed at.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A control device according to an embodiment of the present invention for achieving the above technical problem includes an RF receiver for receiving an RF signal from an air pressure sensor that is provided in a tire of an own vehicle or another vehicle and measures the air pressure, another control device installed in the own vehicle and a CAN (Controller Area Network) A CAN communication unit for exchanging data through communication, and an MCU performing a logical operation to identify whether the air pressure sensor is a sensor provided in the tire of the host vehicle according to whether or not the air pressure sensor satisfies the filtering condition. , The MCU may determine whether the air pressure sensor satisfies the filtering condition using at least one of sensor ID, device ID, RSSI, and count information.

According to an embodiment, the control device may be installed to be spaced apart from another control device installed in the own vehicle by a predetermined distance or more.

The control device according to an embodiment may further include an RSSI measuring unit that measures Received Signal Strength Indication (RSSI) of the air pressure sensor signal.

According to an embodiment, the CAN communication unit may exchange data including at least one of sensor ID, device ID, RSSI, and count information with other control devices installed in the own vehicle.

According to an embodiment, when the same sensor ID as the air pressure sensor does not exist in the data received from another control device, and both RSSI and Count are equal to or greater than a preset value, the MCU may determine that the filtering condition is satisfied. have.

According to an embodiment, when the same sensor ID as the air pressure sensor exists in data received from another control device and the difference in RSSI is greater than or equal to a preset value, the MCU may determine that the filtering condition is satisfied.

According to an embodiment, the MCU may determine the high-rank N sensors (N is the number of tires of the own vehicle) among the sensors satisfying the filtering condition as the sensors of the own vehicle.

In order to achieve the above technical problem, a method for identifying an air pressure sensor of an own vehicle by a control device according to an embodiment of the present invention includes: (a) receiving an RF signal from an air pressure sensor provided in a tire of the own vehicle or another vehicle. The steps of, (b) exchanging data with other control devices installed in the own vehicle through CAN (Controller Area Network) communication, and (c) provided in the tire of the host vehicle according to whether the air pressure sensor satisfies the filtering condition. It includes the step of identifying whether it is a sensor, and the step (c) may determine whether the pneumatic pressure sensor satisfies the filtering condition by using at least one of sensor ID, device ID, RSSI, and count information.

According to an embodiment, the method of identifying the air pressure sensor may further include (a-1) measuring a received signal strength indication (RSSI) of a signal received from the air pressure sensor.

According to an embodiment, in step (c), when the same sensor ID as the air pressure sensor does not exist in the data received from another control device, and both RSSI and Count are equal to or greater than a preset value, the filtering condition is satisfied. I can judge.

According to an embodiment, in step (c), when the same sensor ID as the air pressure sensor exists in data received from another control device, and the difference in RSSI is greater than or equal to a preset value, it is determined that the filtering condition is satisfied. I can.

According to an embodiment, in step (c), among the sensors satisfying the filtering condition, the highest N sensors having a high count (N is the number of tires of the own vehicle) may be determined as the sensors of the own vehicle.

According to the present invention, it is possible to determine whether the air pressure data received by the vehicle controller is a signal received from a sensor provided in the own vehicle's tire, and accurately measure the tire air pressure of the own vehicle from this, There is an effect that can prevent accidents caused by.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a diagram illustrating an example of a sensor recognition error caused by a vehicle traveling in close proximity in the related art.
2A is a view showing a data processing method in a tire air pressure monitoring system equipped with a repeater according to the prior art.
2(b) is a diagram showing a data processing method in a tire air pressure monitoring system using a control device according to an embodiment of the present invention.
3 is a view showing the configuration of a tire air pressure monitoring system using a control device according to an embodiment of the present invention.
4 is a diagram showing the configuration of a control device according to an embodiment of the present invention.
5 is a view for explaining a preferred installation position of a control device in the air pressure monitoring system according to an embodiment of the present invention.
6 is a table showing examples of data exchanged by a control device according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating an example in which data constituting the table shown in FIG. 6 is measured.
8 is a diagram illustrating a method of identifying an air pressure sensor according to an embodiment of the present invention.
9 is a diagram illustrating a method of determining whether a filtering condition is satisfied by a control device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments to be posted below, but may be implemented in various different forms, and only these embodiments make the posting of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs.

In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically. The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase.

As used in the specification, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements, and/or elements, steps, actions and/or elements mentioned. Or does not exclude additions.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, a configuration of the control device 200 according to an embodiment of the present invention will be described with reference to FIG. 4.

Referring to FIG. 4, the control device 200 according to an embodiment of the present invention may include an RF receiver 210, a CAN communication unit 220, an RSSI measurement unit 230, and an MCU 240.

The RF receiver 210 may receive an RF signal from the pneumatic pressure sensor 100 provided in the tire at a constant period. The RF signal received by the RF receiver 210 may be a signal transmitted by a sensor provided in the tire of the own vehicle, a signal transmitted by a sensor provided in the tire of another vehicle, and includes sensor ID and air pressure measurement data. can do. Here, the sensor ID is unique identification information given to each sensor, and is information for distinguishing the tires that have transmitted each signal, and the air pressure measurement data is data obtained by numerically converting the air pressure measured by the air pressure sensor 100.

The CAN communication unit 220 may perform CAN (Controller Area Network) communication with internal and external devices in the vehicle, and in particular, the control devices 200-1 and 200-2 according to the present invention control other devices through the CAN communication unit 220 It can communicate with the device to exchange data. Data exchanged between the control devices 200-1 and 200-2 with other control devices may include sensor ID, device ID, RSSI, and count data.

As described above, the sensor ID is unique identification information given to each sensor, and is information for distinguishing the tire that has transmitted each signal, and the device ID is unique identification information given to each control device like the sensor ID, When one control device receives data from another control device, this is information for identifying from which control device the received data is transmitted. RSSI is a numerical value representing the strength of the RF signal received from the sensor by the control device, and Count refers to the number of times the control device receives a signal from the sensor during a certain period.

That is, the plurality of control devices according to the present invention mutually exchange the sensor ID of the pneumatic sensor 100 and the RSSI, which is the strength of the signal received from the corresponding sensor, and the count information, which is the number of times the signal is received from the sensor during a certain period. And, by comparing these and performing filtering, it is possible to determine whether the sensor corresponding to the received sensor ID is the air pressure sensor 100 provided in the own vehicle.

The RSSI measurement unit 230 may measure the received signal strength (RSSI) of the RF signal received from the air pressure sensor 100, where the RSSI is the power intensity of the signal received by the receiver as a numerical value. Is shown. The RSSI has a larger value as the strength of the received signal increases. In the case of transmitting and receiving a wireless signal as in the present invention, the RSSI may be larger as the signal transmission distance is closer, and the RSSI may be smaller as the transmission distance is farther. That is, the RSSI measurement unit 230 provided in the control devices 200-1 and 200-2 measures the strength of the signal received from the air pressure sensor 100 provided in the tire and calculates it as an RSSI value. The RSSI value may be larger as the signal received from the air pressure sensor 100 provided in a tire physically close from the control devices 200-1 and 200-2. That is, RSSI can be used as a kind of index indicating the physical distance between the control device and the sensor.

The microcontroller unit (MCU) 240 may perform a logical operation using data received through the RF receiving unit 210 or the CAN communication unit 220 and determine whether the sensor is a sensor provided in the tire of the host vehicle. .

Hereinafter, in describing the plurality of control devices in the present specification, two control devices of the first control device 200-1 and the second control device 200-2 will be described as examples, but this is only for illustration purposes. Of course, three or more control devices may be included depending on the type or size of the device.

In addition, in the present specification, when it is necessary to separate and describe a plurality of control devices, they will be described as the first control device 200-1 and the second control device 200-2. In describing the common technical features, for convenience of description, the control devices 200-1 and 200-2 will be described.

In addition, the configuration of the control device 200 described above with reference to FIG. 4 is for representatively describing the configuration of a plurality of control devices 200-1 and 200-2 to be described later. The control devices 200-1 and 200-2 may include the same components as the control device 200 illustrated in FIG. 4.

In addition, in the following specification, the control devices 200-1 and 200-2 may be a main controller or a repeater provided inside a vehicle, but are not necessarily limited thereto, and the same configuration as the present invention and It can include any device that performs a function.

Hereinafter, with reference to FIGS. 2 to 3, an air pressure monitoring system using the control devices 200-1 and 200-2 according to an embodiment of the present invention will be described.

2A is a view showing a data processing method in a tire air pressure monitoring system equipped with a repeater according to the prior art.

Referring to FIG. 2(a), the prior art uses a method of receiving a sensor signal using a plurality of devices (main controller and repeater), but in this prior art, the repeater is simply data that the main controller cannot sufficiently receive. It only serves as an intermediary device that receives and transmits it to the main controller, and the determination of whether the signal is a signal received from the sensor of the host vehicle is still performed based on the number of signals received from the sensor or repeater, so that the vehicle runs in proximity. If there is a vehicle, it still has the above problems.

2(b) is a diagram showing a data processing method in a tire air pressure monitoring system using the control devices 200-1 and 200-2 according to an embodiment of the present invention.

2(b), the tire air pressure monitoring system according to the present invention includes a plurality of control devices 200-1 and 200-2, but unlike the prior art, a plurality of controller area networks (CAN) By exchanging data received by each of the devices and performing filtering according to a certain condition through comparison of the data, it is possible to accurately determine whether the signal is received from the air pressure sensor of the host vehicle.

3 is a diagram showing the configuration of a tire air pressure monitoring system 10 using the control devices 200-1 and 200-2 according to an embodiment of the present invention.

The air pressure sensor 100 may be provided in the tire to measure the air pressure of the tire and transmit the measured data to the control devices 200-1 and 200-2 as RF signals together with the sensor ID.

The control devices 200-1 and 200-2 receive an RF signal from the pneumatic pressure sensor 100 and determine whether the pneumatic pressure sensor 100 is a sensor provided in the tire of the host vehicle according to whether or not the pneumatic pressure sensor 100 satisfies the filtering condition. I can.

At this time, the first control device 200-1 and the second control device 200-2 are positioned at the tire positions as shown in FIG. 5 in order to receive accurate signals from sensors provided in all tires of the vehicle. Accordingly, it is desirable to be installed spaced apart by a certain distance or more inside the vehicle.

Hereinafter, a process of determining whether the control devices 200-1 and 200-2 according to an embodiment of the present invention is a signal received from a sensor of the host vehicle will be described in detail with reference to FIGS. 6 to 7. .

Prior to explaining through examples, as described above, RSSI may be used as a kind of index indicating the physical distance between the control device and the sensor. According to a preferred embodiment of the present invention, a plurality of control devices are separated by a predetermined distance or more. When installed, it is necessary to note that a difference occurs in the strength (RSSI) of the signal received from the air pressure sensor 100 provided in a specific tire of the host vehicle. That is, the high RSSI value is measured in the control devices 200-1 and 200-2 that are close to the physical distance from the air pressure sensor 100 provided in a specific tire, while other control devices 200-1 and 200 installed spaced apart from the air pressure sensor 100 -2) A low RSSI value is measured for the signal received from the same sensor.

6 is a table showing an example of data exchanged between the control devices 200-1 and 200-2 according to an embodiment of the present invention, and FIG. 7 is a table in which data constituting the table shown in FIG. 6 are measured. It is a figure showing an example.

In Fig. 6, the first control device (corresponding to device ID 1) and the second control device (corresponding to device ID 2) receive signals from three air pressure sensors (corresponding to sensor IDs A, B, and C), A situation in which RSSI and Count data of a signal are interchanged is shown as an example. The numerical values in the table of FIG. 6 are described as natural numbers from 1 to 10 for convenience in order to indicate that the numerical values are high and low, but this is for illustration only and does not limit the embodiments of the present invention.

First, in the case of a sensor having a sensor ID of A, it can be confirmed that only data for a signal received by the first control device exists and no data for a signal received by the second control device exists. In this way, when a signal from a specific sensor is received by only one control device (the first control device), if the strength (RSSI) and the number of times of reception (Count) of this signal are sufficiently high, this is shown in FIG. 7(a). As described above, it can be estimated that the signal is received from a sensor provided in a tire of the own vehicle that is physically close to the first control device.

That is, in the control devices 200-1 and 200-2 according to an embodiment of the present invention, the same sensor ID as the sensor does not exist in data received from another control device, and both RSSI and Count are preset values. In the above case, it may be determined that the filtering condition is satisfied.

In the case of a sensor with a sensor ID of B, the first control device and the second control device have almost the same received signal strength (RSSI) for the signal received from the sensor B, and in this case, a sensor with a sensor ID of B is provided. It can be seen that the tire is located at a point where the physical distance between the first control device and the second control device is similar. Therefore, it can be estimated that the sensor B is a sensor provided in the tire of another vehicle as shown in FIG. 7(b).

In contrast, in the case of a sensor with a sensor ID of C, there is a difference in the received signal strength (RSSI) for a signal received by the first control device and the second control device from the sensor. In this case, a sensor with a sensor ID of C It can be seen that the equipped tire is located at a point where there is a difference in physical distance from the first control device and the second control device. In this case, if the RSSI of the sensor having the highest RSSI measured is sufficiently high, it can be estimated that the sensor is provided in the tire of the host vehicle as shown in FIG. 7C.

That is, when the control devices 200-1 and 200-2 according to an embodiment of the present invention have the same sensor ID as the sensor in data received from another control device, and the difference in RSSI is greater than or equal to a preset value , It can be determined that the filtering condition is satisfied.

The control devices 200-1 and 200-2 perform filtering on the sensor based on the air pressure sensor signal and the interchanged data as described above, and then in the order of the highest Count among the sensors that satisfy the filtering condition. By selecting as many sensors as the number of tires of the own vehicle, it can be determined that these are sensors provided in the tires of the own vehicle.

Meanwhile, according to an embodiment of the present invention, a method of identifying an air pressure sensor of an own vehicle using the above-described control devices 200-1 and 200-2 may be provided.

8 is a diagram illustrating a method of identifying an air pressure sensor according to an embodiment of the present invention.

Referring to FIG. 8, a method of identifying an air pressure sensor of an own vehicle by the control devices 200-1 and 200-2 includes a step of measuring the air pressure of the tire by the air pressure sensor 100 (S810 ), and the control device 200-1 , 200-2) receiving an RF signal including the sensor ID and air pressure measurement data from the air pressure sensor (S820), the control devices 200-1 and 200-2 received an RSSI (Received Signal) of the signal received from the air pressure sensor. Strength Indication) measuring (S830), exchanging data (S840), and determining whether it is a sensor provided in a tire of the host vehicle (S850) according to whether or not a filtering condition is satisfied.

9 is a diagram illustrating a method of determining whether a filtering condition is satisfied by the control devices 200-1 and 200-2 according to an embodiment of the present invention.

Referring to FIG. 9, the air pressure sensor identification method according to an embodiment of the present invention may receive data including sensor ID, device ID, RSSI, and count information from another control device (S910).

When the same sensor ID as the sensor does not exist in the data received from another control device (S920), and both RSSI and Count are equal to or greater than a preset value (S930), or the same sensor ID as the sensor in the data received from another control device When is present (S920) and the difference in RSSI is greater than or equal to a preset value (S940), it may be determined that the filtering condition is satisfied (S950).

According to an embodiment, after filtering data according to the filtering condition as described above, among the sensors satisfying the filtering condition, as many sensors as the number of tires of the own vehicle are selected in the order of the highest Count, these sensors are provided in the tire of the own vehicle. It can be determined to be.

Each step of the air pressure sensor identification method may be performed by each component of the control devices 200-1 and 200-2, and the control device described above even if not described in detail in the description of the air pressure sensor identification method It goes without saying that a method of identifying an air pressure sensor according to various embodiments using functions performed by each of the components of (200-1, 200-2) may be provided.

Embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects.

10: Air pressure sensor identification system
100: air pressure sensor 200, 200-1, 200-2: control device
210: RF receiver 220: CAN communication unit
230: RSSI measuring unit 240: MCU

Claims (12)

An RF receiver for receiving an RF signal from an air pressure sensor that is provided in a tire of the own vehicle or another vehicle and measures the air pressure;
A CAN communication unit for exchanging data through CAN (Controller Area Network) communication with another control device installed in the own vehicle; And
And an MCU that performs a logical operation for identifying whether the air pressure sensor is a sensor provided in the tire of the host vehicle according to whether the air pressure sensor satisfies the filtering condition, and
The CAN communication unit,
Interchange data including any one or more of sensor ID, device ID, RSSI, and count information with other control devices installed in the own vehicle,
The MCU,
It is determined whether the air pressure sensor satisfies the filtering condition by using at least one of sensor ID, device ID, RSSI, and Count information,
A control device that determines that a filtering condition is satisfied when the same sensor ID as the air pressure sensor does not exist in the data received from another control device, and both RSSI and Count are equal to or greater than a preset value. An RF receiver for receiving an RF signal from an air pressure sensor that is provided in a tire of the own vehicle or another vehicle and measures the air pressure;
A CAN communication unit for exchanging data through CAN (Controller Area Network) communication with another control device installed in the own vehicle; And
And an MCU that performs a logical operation for identifying whether the air pressure sensor is a sensor provided in the tire of the host vehicle according to whether the air pressure sensor satisfies the filtering condition, and
The CAN communication unit,
Interchange data including any one or more of sensor ID, device ID, RSSI, and count information with other control devices installed in the own vehicle,
The MCU,
It is determined whether the air pressure sensor satisfies the filtering condition by using at least one of sensor ID, device ID, RSSI, and Count information,
A control device that determines that a filtering condition is satisfied when the same sensor ID as the air pressure sensor exists in data received from another control device and the difference in RSSI is greater than or equal to a preset value. The method according to claim 1 or 2,
An RSSI measuring unit that measures a received signal strength indication (RSSI) of the air pressure sensor signal;
Further comprising a control device. The method according to claim 1 or 2,
The CAN communication unit,
Sensor ID, device ID, RSSI, and count information to exchange data including any one or more of the other control devices installed in the vehicle
controller. delete delete The method according to claim 1 or 2,
The MCU,
Among the sensors satisfying the filtering condition, the highest N sensors (N is the number of tires of the own vehicle) are determined as the sensors of the own vehicle.
controller. In the method for identifying an air pressure sensor of an own vehicle by a control device,
The control device,
(a) receiving an RF signal from an air pressure sensor provided in a tire of an own vehicle or another vehicle;
(b) exchanging data with another control device installed in the host vehicle through CAN (Controller Area Network) communication; And
(c) identifying whether the air pressure sensor is a sensor provided in the tire of the host vehicle according to whether the air pressure sensor satisfies the filtering condition; and
The step of measuring RSSI (Received Signal Strength Indication) of the signal received from the air pressure sensor (a-1); further includes,
The step (c),
Determining whether the air pressure sensor satisfies the filtering condition using at least one of sensor ID, device ID, RSSI, and Count information; further comprising,
When the same sensor ID as the air pressure sensor does not exist in the data received from another control device, and both RSSI and Count are equal to or greater than a preset value, the method for identifying a pneumatic pressure sensor is determined to satisfy a filtering condition. In the method for identifying an air pressure sensor of an own vehicle by a control device,
The control device,
(a) receiving an RF signal from an air pressure sensor provided in a tire of an own vehicle or another vehicle;
(b) exchanging data with another control device installed in the host vehicle through CAN (Controller Area Network) communication; And
(c) identifying whether the air pressure sensor is a sensor provided in the tire of the host vehicle according to whether the air pressure sensor satisfies the filtering condition; and
The step of measuring RSSI (Received Signal Strength Indication) of the signal received from the air pressure sensor (a-1); further includes,
The step (c),
Determining whether the air pressure sensor satisfies the filtering condition using at least one of sensor ID, device ID, RSSI, and Count information; further comprising,
When the same sensor ID as the air pressure sensor exists in the data received from another control device, and the difference between the RSSI is greater than or equal to a preset value, the method of identifying a pneumatic pressure sensor is determined to satisfy a filtering condition. delete delete The method according to claim 8 or 9,
The step (c),
Among the sensors satisfying the filtering condition, the highest N sensors (N is the number of tires of the own vehicle) are determined as the sensors of the own vehicle.
How to identify the air pressure sensor.

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