KR100361012B1 - Running situation checking instrument for tire - Google Patents

Abstract

The present invention relates to a measuring device for detecting a driving state of a tire that enables a driver to easily detect and identify a state of a running tire to enable a more stable driving.

As a technique for measuring a steering angle of a conventional wheel, a steering angle with an encoder is mounted to measure a rotation angle of a steering wheel, and the steering angle is calculated by dividing it by a steering ratio.

However, due to steering compliance, the steering wheel rotates left and right due to steering compliance, and it is difficult to measure the amount of wheel rotation regardless of the steering wheel, especially when the tire is bumpy. According to the present invention, a tire such as a steering angle, a camber angle, a vertical movement of the wheel is attached by attaching a material that can be detected by the sensor to the inside of the wheel on which the tire is mounted, and attaching the sensor to the lower end of the vehicle body to measure the distance. By detecting and displaying the driving state of the wheel, the driving state of the tire can be known by analyzing the behavior of the wheel on which the tire is mounted. By displaying the measured result on the monitor installed inside the vehicle, the driver always observes the driving condition of the tire, thus preventing accidents such as tire puncture or air pressure drop in advance.

Description

Running situation checking instrument for tires

The present invention relates to a measuring device for detecting a driving state of a tire, and more particularly, to detect a driving state of a tire that enables a driver to easily detect a state of a tire that is being driven, thereby enabling more stable driving. It relates to a measuring device.

In general, the factors indicative of the state of the tire and the wheel being driven include the steering angle of the wheel, the camber angle, and the vertical vibration of the wheel.

Here, the steering angle and the camber angle of the wheel provide very important information in analyzing the steering stability of the vehicle.

The steering angle of the wheel is the difference between the steering direction of the vehicle and the driving direction of the wheel on which the tire is mounted, and the camber angle indicates how much the wheel is inclined perpendicularly to the ground.

The change in the steering angle and the camber angle of the wheel has a great influence on the driving, braking force, cornering force and self-alignment of the tire, which is directly related to the steering stability of the vehicle.

Therefore, precisely measuring the steering angle and camber angle of the wheel can be used as important information for tire performance development as well as vehicle performance analysis.

As a technique for measuring a steering angle of a conventional wheel, a steering angle with an encoder is mounted to measure a rotation angle of a steering wheel, and the steering angle is calculated by dividing it by a steering ratio.

However, due to the steering compliance, the steering wheel rotates left and right due to the steering compliance, and it is difficult to measure the amount of wheel rotation regardless of the steering wheel, especially when the tire is bumpy.

In addition, a special device is attached to the handle portion there is a problem in the inconvenience of operation and mounting is not easy.

In addition, in order to specify the camber angle of the wheel in the driving vehicle, it is possible to measure by using special equipment such as a wheel vector sensor, but the equipment is quite expensive and it takes a long time to install.

The present invention is to solve the conventional problems as described above, the present invention is configured by attaching a material that can be detected by the magnetic material or the laser sensor on the inside of the tire wheel and installing a sensor for detecting it on the lower end of the vehicle body.

The distance from the sensor to the wheel is obtained by firing ultrasonic or laser beams from the sensor, and several mathematical equations are used to obtain information about the steering angle and camber angle of the wheel and the driving state of the tire wheel.

1 is an explanatory diagram showing an apparatus for measuring a tire running state of the present invention;

Figure 2 is a schematic diagram showing a driving state calculation process of the present invention

Figure 3 is a side view of the tire showing the measuring position of the present invention

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

1 is a perspective view showing a measuring device of the present invention.

As shown in FIG. 1, the tire is mounted on a wheel and connected to the body of the vehicle by suspension.

In order to measure the driving state of the tire mounted on the vehicle, a sensor is first installed in the vehicle body.

The distance to the six points of the wheel on which the tire is mounted is measured by a sensor attached to the vehicle body.

Here, the sensor detects the position of the magnetic material or the laser sensor installed inside the wheel.

The algorithm for obtaining the steering angle and the camber angle of the wheel indicating the driving state of the tire wheel by using the measured result as described above is as follows.

First, the tire was set to X _b Y _b Z _b coordinate system to the XYZ coordinate system and the sensor attached to the vehicle body attached to the center portion of the wood wheel position. Here, the origins of the XYZ and X _b Y _b Z _b coordinate systems in space are represented by 0 and 0 _b , respectively. The ultrasonic or laser sensor fires at the pre-designated point P1-P6 on the wheel and measures the return time to determine the distance L1-L6.

Variables already known in the system are summarized as follows.

1. Origin of the X _b Y _b Z _b coordinate system: 0 _b

2.Wheel attitude with respect to XYZ coordinate system: P1, P2, P3, P4, P5, P6

3. Distance from sensor to wheel: L1, L2, L3, L4, L5, L6

In order to obtain the tire / wheel driving information about the body, the relationship of XYZ to the X _b Y _b Z _b coordinate system is known.

This is easily solved by finding the zero and Euler parameters of the XYZ coordinate system, as is well documented in the literature. Therefore, the variables to be obtained are summarized as follows.

1. Origin of XYZ coordinate system: 0 = {x, y, z}

Euler factor: _e 0, _e 1, _e 2, _e 3

here Using this constraint, the unknowns are reduced to six. Therefore, six constraint equations are required to find the six unknowns.

These six constraint equations can be obtained by using the distance from the sensor to the wheel: L1, L2, L3, L4, L5, L6.

Constraints: , i = 1,2,3,4,5,6 (1)

here (i = 1, ...., 6) is the position of P1-P6 with respect to the X _b Y _b Z _b coordinate system.

, i = 1, 2, 3, 4, 5, 6 (2)

[A] = 2

Of formula (2) If we solve the solution of six nonlinear equations by substituting for Eq. (1), we can find the above unknowns, and we can know the relationship of XYZ with respect to the X _b Y _b Z _b coordinate system.

Finally, from the XYZ information on X _b Y _b Z _b coordinate system with respect to find out how to obtain the traffic information of the tire / wheel.

In the XYZ coordinate system, a normal vector N = {0,1,0} perpendicular to the wheel plane is mapped to the X _b Y _b Z _b coordinate system as follows.

N '= [A] N

= {x _b y _b z _b } (3)

From the above equation (3), the steer angle (δ) and camber angle (γ) of the wheel representing the tire / wheel travel information are obtained as follows.

Wheel steer angles: (4)

Wheel camber each: (5)

All the above calculations to obtain the driving information of the tire / wheel as described above are performed by a computer as shown in Fig. 2. When the address L (i-1, ..., 6) measured by the sensor is input to the room (rom) where the operation process is stored, the data is automatically processed. In addition, the calculated result is output on the screen of the vehicle so that the driver can always observe the driving state of the tire.

In the present invention described so far, the structure of the tire / wheel can be obtained by attaching a material that can be recognized by the sensor to the inside of the automobile wheel and mounting the sensor to the vehicle body, so that the structure is considerably simpler than the conventional method. have.

In addition, since the amount of rotation of the wheel is directly measured, the amount generated from the compliance of the steering system can be accurately measured, and since the sensor is attached to the outside of the vehicle, it does not inconvenience the driver at all.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

The effect obtained by applying this technique is described as follows.

1. It is possible to know the driving condition of tires by analyzing the behavior of tire-mounted wheels in driving vehicles. By displaying the measured result on the monitor installed inside the vehicle, the driver always observes the driving condition of the tire, thereby preventing accidents such as tire punk or air pressure drop in advance.

2. It extracts data about steer angle and camber angle of tire which directly affects vehicle movement and can be effectively used for tire / vehicle performance analysis.

3. In this system, the data related to the up and down vibration of the wheel can be measured, so that the uneven information of the road surface can be predicted, and this information can be used to control the active suspension.

Claims (5)

Attaching a material that can be detected by the sensor to the inside of the wheel on which the tire is mounted, and attaching the sensor to the lower end of the vehicle body to detect the driving state of the tire / wheel by measuring the distance, and to display it, the inside of the wheel 3 positions are set correctly in the vehicle body and the sensor fixed to the lower part of the body measures the distance to these three points so that the driving condition of the tire / wheel can be recognized, and the distances from the center of the wheel to these three points d1, d2, d3 From constraints Equation (3) and three constraints of equation (1) are used to solve the nonlinear equations using a total of six equations to obtain the center point of the wheel and the Euler factor to obtain the driving condition of the tire / wheel. Measuring device for detecting the running state of the tire. delete delete delete delete