KR102152877B1 - Tire performance evaluation system and method thereof - Google Patents

Abstract

The present invention relates to a tire performance evaluation system and a method thereof. Embodiments of the present invention provide the tire performance evaluation system capable of accurately evaluating a water film phenomenon of a tire without a separate wheel speed sensor, and the method thereof. One embodiment of the present invention provides the method for evaluating the performance of a tire through actual driving of a vehicle equipped with the tire, the method comprising the following steps of: entering the vehicle at a preset speed on a test road implementing the wet road surface; measuring engine noise of the vehicle while accelerating the speed of the vehicle on the test road; extracting the speed of the vehicle at the time when the water film phenomenon of the tire occurs using a change in a measured value of the engine noise over time; and evaluating the performance of the tire based on the extracted speed of the vehicle.

Description

Tire performance evaluation system and method {TIRE PERFORMANCE EVALUATION SYSTEM AND METHOD THEREOF}

Embodiments of the present invention relate to a tire performance evaluation system and method.

When a car travels on rainy roads or on a road with water at high speed, water pressure is formed between the tire and the road surface, losing grip and floating on the water. This phenomenon is called hydroplaning. When water screening occurs, the frictional resistance between the tire and the road surface drops sharply, and the steering and braking power decreases, which may cause an accident as the car crosses the center line or slides off the road. In the case of a passenger car, this phenomenon usually occurs when running more than 90 km/h, but even with the same tire, it varies depending on the wear condition and air pressure. If the air pressure is low or the tires are worn, it is very dangerous because it occurs even at a speed of 70 km/h.

Conventionally, a wheel speed sensor was installed to measure the vehicle speed at a specific slip ratio at which the wheel turns away from the road surface to evaluate the tire water film performance.Due to the difference in the circumference of the tire, the wheel speed sensor and the vehicle There were problems such as having to calibrate the speed sensor.

Embodiments of the present invention provide a tire performance evaluation system and method capable of accurately evaluating the water film phenomenon of a tire without a separate wheel speed sensor.

An embodiment of the present invention is a method for evaluating the performance of a tire through actual driving of a vehicle equipped with a tire, the step of entering the vehicle at a preset speed on a test road implementing a wet road surface, on the test road Measuring the engine noise of the vehicle while accelerating the speed of the vehicle, extracting the speed of the vehicle at the time when the water film phenomenon of the tire occurs using a change in the measured value of the engine noise over time And it provides a tire performance evaluation method comprising the step of evaluating the performance of the tire based on the extracted vehicle speed.

In an embodiment of the present invention, in the measuring the engine noise of the vehicle, the engine noise of the vehicle may be measured according to a predetermined time interval.

In one embodiment of the present invention, the extracting of the vehicle speed includes a point in time when the degree of change of the measured value of the engine noise with respect to the time interval becomes greater than or equal to a preset value, when the water film phenomenon of the tire occurs. It is determined as a time point, and the vehicle speed at the time point may be extracted.

In one embodiment of the present invention, the extracting of the vehicle speed comprises determining a time when the measured value of the engine noise over time is a maximum value as a time when the water film phenomenon of the tire occurs, and at the time The vehicle speed can be extracted.

In an embodiment of the present invention, in the measuring of the engine noise of the vehicle, the engine noise of the vehicle may be measured using an acoustic sensor disposed inside the vehicle.

In an embodiment of the present invention, the step of extracting the vehicle speed may be extracted from speed data measured in time series using a GPS sensor mounted on the vehicle.

According to an embodiment of the present invention, in a tire performance evaluation system for evaluating the performance of a tire through actual driving of a vehicle equipped with a tire, an acoustic sensor disposed inside the vehicle and measuring engine noise of the vehicle, A speed sensor mounted on the vehicle to measure the speed of the vehicle to generate speed data, and a measured value of the engine noise and the speed data are provided, and the tire using a change in the measured value of the engine noise over time It provides a tire performance evaluation system including a performance evaluation unit for extracting the speed of the vehicle at the time when the water film phenomenon occurs.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

The tire performance evaluation system and method according to an embodiment of the present invention includes a separate wheel speed sensor by extracting the vehicle speed at the time when the water film phenomenon occurs by using the change in engine noise measured through the acoustic sensor. Without doing so, you can accurately evaluate the performance of your tires.

1 is a diagram schematically showing a configuration for evaluating the performance of a tire on a wet road surface.
2 is a view for explaining a method for evaluating the performance of a tire according to a comparative example of the present invention.
3 and 4 are conceptual diagrams schematically illustrating a tire performance evaluation system according to an embodiment of the present invention.
5 is a view for explaining a tire performance evaluation method according to an embodiment of the present invention.
6 is a diagram showing a measured value of engine noise measured using an acoustic sensor according to an embodiment of the present invention.
7 is a diagram illustrating engine noise in a two-dimensional color map.

Since the present invention can apply various transformations and have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. Effects and features of the present invention, and a method of achieving them will be apparent with reference to the embodiments described later in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, the same or corresponding constituent elements are assigned the same reference numerals, and redundant descriptions thereof will be omitted. .

In the following embodiments, terms such as first and second are not used in a limiting meaning, but are used for the purpose of distinguishing one component from another component.

In the following examples, the singular expression includes the plural expression unless the context clearly indicates otherwise.

In the following embodiments, terms such as include or have means that the features or elements described in the specification are present, and do not preclude the possibility of adding one or more other features or elements in advance.

In the drawings, components may be exaggerated or reduced in size for convenience of description. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to what is shown.

Hereinafter, with reference to the drawings, a tire wear evaluation system according to an embodiment of the present invention and a tire wear evaluation method using the same will be described.

1 is a view schematically showing a configuration for evaluating the performance of a tire on a wet road surface, and FIG. 2 is a view for explaining a method for evaluating the performance of a tire according to a comparative example of the present invention.

Tires are mounted on vehicles to improve vehicle ride comfort and increase friction, and it is important to evaluate and analyze their performance to ensure safety while driving. Tire performance may include the basic static characteristics of the tire, handling, ride, durability, traction, wear, and NVH (noise, vibration, harshness). . The embodiments of the present invention are for evaluating the water film performance of a tire that affects the steering and braking power of a vehicle on a wet road among the performances of the above tires. We would like to provide a system and method that can be used.

Here, hydroplaning refers to a phenomenon in which, when a car travels on a rainy road or a road with water at high speed, water pressure is formed between the tire and the road surface, resulting in loss of traction and floating on the water. The water film phenomenon occurs when the pressure of the water film invading the tread surface of the tire is balanced with the load of the tire, and is caused by the size of the tire, the load, the material properties, the rotation speed, the shape of the tread groove, the thickness of the water film, and the material of the road surface. get affected.

1 and 2, the method for evaluating the performance of the tire against the water film phenomenon described above is to prepare a test road unit 2 implementing a wet road surface, and install a tire on the test road unit 2 It can be evaluated while driving the installed vehicle 1. Methods of testing the water film phenomenon include a straight hydroplaning test (Longitudinal or straight hydroplaning) to evaluate the water film phenomenon that occurs when driving on a straight road, and a diaphragm test (Lateral or curve) to evaluate the water film phenomenon while driving on a curved road. hydroplaning), but hereinafter, the description will focus on the case of evaluating the linear meninges phenomenon.

The test road unit 2 may be in the form of a reservoir containing a liquid such as water to implement a wet road surface. The test road unit 2 can accommodate the above-described liquid at a predetermined height, for example, about 8 mm of water. The length L of the test road unit 2 may have a length sufficient to confirm the water film phenomenon when driving the vehicle.

Conventionally, a vehicle speed sensor mounted on a vehicle to evaluate the water film phenomenon, a wheel speed sensor and a wheel speed sensor mounted on the wheel to measure the rolling speed of the tire are provided, and the slip rate derived from the wheel speed and the vehicle speed The performance of the tire is evaluated by extracting the vehicle speed at the time point A when the (slip ratio) becomes a specific value X1.

Here, the slip rate is given by Equation 1 below.

[Equation 1]

This method has the hassle of attaching and detaching the wheel speed sensor every time an evaluation is performed on different types of tires. If the circumference length of the tire is different, calibration for the wheel speed and the vehicle speed must be performed. Performance evaluation was possible.

The present invention is to solve the above problem, characterized in that the performance of the tire is evaluated without a separate wheel speed sensor. Hereinafter, it will be described in more detail with reference to the drawings.

3 and 4 are conceptual diagrams schematically illustrating a tire performance evaluation system according to an embodiment of the present invention, and FIG. 5 is a view for explaining a tire performance evaluation method according to an embodiment of the present invention. .

3 to 5, the tire performance evaluation system 100 according to an embodiment of the present invention is a system for evaluating the performance of a tire through actual driving of a vehicle 1 equipped with a tire, and an acoustic sensor 110, a speed sensor 130 and a performance evaluation unit 120 may be provided.

The acoustic sensor 110 is disposed inside the vehicle 1 and can measure the engine noise of the vehicle 1. The acoustic sensor 110 may be disposed outside the vehicle 1, but if it is disposed outside the vehicle 1, it is difficult to accurately measure the engine noise due to external noise, so it is placed inside the vehicle 1 Can be. In particular, the acoustic sensor 110 may be disposed on the driver's seat 10, in particular, the headrest of the driver's seat 10 in order to minimize an error of detecting other vibration noise as engine noise. Through this, the acoustic sensor 110 may more accurately measure the engine noise transmitted to the vehicle interior space (I).

The acoustic sensor 110 may transmit the detected engine noise to the performance evaluation unit 120. The acoustic sensor 110 may transmit a measured value of engine noise detected in time series through known wired/wireless communication to the performance evaluation unit 120.

The speed sensor 130 may be mounted on the vehicle 1 to measure the speed of the vehicle 1 to generate speed data. The speed sensor 130 may be any means capable of measuring the speed of the vehicle 1, but for a more accurate measurement, for example, the speed of the vehicle 1 can be measured using a satellite navigation system (GPS). I can.

The performance evaluation unit 120 may receive a measurement value of engine noise from the acoustic sensor 110 and may receive speed data from the speed sensor 130. The performance evaluation unit 120 may be disposed outside the vehicle 1 by having a wireless communication module, but hereinafter, for convenience of explanation, a case where the performance evaluation unit 120 is disposed on the vehicle 1 will be mainly described. The performance evaluation unit 120 may include a device capable of processing data such as a processor, and may include an acoustic analysis simulator to analyze a measured value of engine noise provided from the acoustic sensor 110. .

Here, the'processor' may refer to a data processing device embedded in hardware having a circuit physically structured to perform a function represented by a code or instruction included in a program. As an example of such a data processing device built into the hardware, a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, and an ASIC (Application-Specific Integrated) Circuit) and processing devices such as a Field Programmable Gate Array (FPGA) may be covered, but the scope of the present invention is not limited thereto.

The performance evaluation unit 120 may extract the vehicle speed at the time when the water film phenomenon of the tire occurs by using the change in the measured value of the engine noise over time. The performance evaluation unit 120 may evaluate the performance of the tire through the extracted vehicle speed.

Hereinafter, a method of evaluating the performance of a tire according to an embodiment of the present invention will be described in detail.

In the method for evaluating the performance of a tire having the above-described configuration, first, the vehicle 1 enters the vehicle 1 at a preset speed on the test road unit 2 implementing a wet road surface. Since the water film phenomenon of tires is a phenomenon that occurs when driving at high speed on the wet road surface, the tire performance evaluation method is to increase the efficiency of the evaluation process by entering the vehicle 1 into the test road unit 2 at a certain speed or higher. I can. For example, when entering the test road, the speed of the vehicle 1 may be a value between 50 km/h and 60 km/h.

Next, the tire performance evaluation method uses the acoustic sensor 110, measures the engine noise of the vehicle 1 while accelerating the speed of the vehicle 1 on the test road, and evaluates the measured value of the measured engine noise. It can be provided as part 120. In this case, in the step of measuring the engine noise of the vehicle, the engine noise of the vehicle may be measured according to a predetermined time interval while accelerating the vehicle to the maximum. In other words, the acoustic sensor 110 measures the engine noise of the vehicle in time series and transmits the measured value measured over time to the performance evaluation unit 120.

Next, the tire performance evaluation method may extract the vehicle speed at the time when the water film phenomenon of the tire occurs by using a change in the measured value of the engine noise over time. Specifically, when the water film phenomenon of the tire occurs, the tire becomes idle while a slip phenomenon arises from the ground, so that the engine RPM increases instantaneously. In other words, the engine noise may also increase rapidly when the tire water film phenomenon occurs. The present invention is a method of evaluating the performance of a tire using this principle, by measuring the engine noise of the vehicle 1 being accelerated using the acoustic sensor 110 disposed inside the vehicle 1, and at this time, the measured engine It is possible to evaluate the performance of the tire by judging the point at which the change in the measured value of noise increases rapidly as the point at which the water film phenomenon occurs.

As an embodiment, in the step of extracting the vehicle speed, the point at which the degree of change of the measured value of the engine noise with respect to the time interval becomes greater than or equal to a preset value is determined as the point at which the water film phenomenon of the tire occurs (A), By extracting the vehicle speed at the time point (A), it is possible to evaluate the performance of the tire. Through this principle, the tire performance evaluation method according to an embodiment of the present invention can evaluate the performance of the tire without measuring the wheel speed and calculating the slip ratio using the wheel speed.

In another embodiment, in the step of extracting the vehicle speed, the time when the measured value of the engine noise over time is the maximum value is determined as the time (A) at which the water film phenomenon of the tire occurs, and the vehicle at the time (A) You can extract the speed.

FIG. 6 is a diagram showing a measurement value of engine noise measured using an acoustic sensor according to an embodiment of the present invention, and FIG. 7 is a diagram showing engine noise as a two-dimensional color map.

Referring to FIG. 6, when the water film phenomenon does not occur (P2), the measured value of the engine noise is maintained within a certain range, whereas when the water film phenomenon occurs (P1), at the time (A) when the water film phenomenon occurs. It can be seen that the measured value of the engine noise has a maximum value. Similarly, referring to FIG. 7, it can be seen that the measured value of the engine noise has a maximum value at the time point A when the water film phenomenon occurs.

Table 1 shows the results of evaluation of the performance of tires according to Comparative Examples and Examples of the present invention. Here, the performance evaluation item of the tire is the vehicle speed at the time when the water film phenomenon occurs. In Table 1, the tire performance evaluation method according to the Comparative Examples and Examples indicates the case where the vehicle, the tire, the test road condition, the entry speed, and the acceleration method are the same.

division Comparative example Example A tire 90.9 km/h 90.8 km/h B tire 88.3 km/h 88.9 km/h C tire 82.7 km/h 83.0 km/h

Referring to Table 1, the vehicle speed at the point of occurrence of the water film phenomenon derived through the tire performance evaluation method according to an embodiment of the present invention is equal to the vehicle speed derived from the comparative example using a specific slip ratio. It can be seen that it represents. Specifically, in the above table, it was confirmed that the coefficient of determination R2 of Comparative Example and Example was very similar to 0.994. As described above, in the tire performance evaluation system and method according to the embodiments of the present invention, by extracting the vehicle speed at the time when the water film phenomenon occurs by using the change in engine noise measured through the acoustic sensor, It is possible to accurately evaluate the performance of tires without having a wheel speed sensor.

As described above, the present invention has been described with reference to an embodiment shown in the drawings, but this is only exemplary, and those of ordinary skill in the art will understand that various modifications and variations of the embodiment are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

1: vehicle
2: test road unit
100: tire performance evaluation system
110: acoustic sensor
120: performance evaluation unit
130: speed sensor

Claims (7)

In the tire performance evaluation method through actual driving of a vehicle equipped with a tire,
Entering the vehicle at a preset speed on a test road implementing a wet road surface;
Measuring engine noise of the vehicle while accelerating the speed of the vehicle on the test road;
Extracting the speed of the vehicle at the time when the water film phenomenon of the tire occurs by using a change in the measured value of the engine noise over time; And
Including, evaluating the performance of the tire based on the extracted vehicle speed. The method of claim 1,
Measuring the engine noise of the vehicle,
A tire performance evaluation method for measuring engine noise of the vehicle at regular time intervals. The method of claim 2,
The step of extracting the vehicle speed,
The time when the degree of change of the measured value of the engine noise with respect to the time interval becomes more than a preset value is determined as the time when the water film phenomenon of the tire occurs, and the vehicle speed at the time is extracted. How to evaluate performance. The method of claim 1,
The step of extracting the vehicle speed,
A method of evaluating tire performance, determining a time point at which the measured value of the engine noise over time is the maximum value as a time point at which the water film phenomenon of the tire occurs, and extracting the vehicle speed at the time point. The method of claim 1,
Measuring the engine noise of the vehicle,
A tire performance evaluation method for measuring engine noise of the vehicle by using an acoustic sensor disposed inside the vehicle. The method of claim 1,
The step of extracting the vehicle speed,
Extracting from speed data measured in time series using a GPS sensor mounted on the vehicle, a tire performance evaluation method. In the tire performance evaluation system that evaluates the performance of the tire through actual driving of a vehicle equipped with a tire,
An acoustic sensor disposed inside the vehicle to measure engine noise of the vehicle;
A speed sensor mounted on the vehicle to measure the speed of the vehicle to generate speed data; And
A performance evaluation unit receiving the measured value of the engine noise and the speed data, and extracting the speed of the vehicle at the time when the water film phenomenon of the tire occurs by using a change in the measured value of the engine noise over time; Tire performance evaluation system comprising a.

Images