KR0174580B1 - Apparatus for measuring and analyzing the vibration of a car handle - Google Patents

Abstract

An apparatus for measuring and analyzing vibration of a steering wheel of a vehicle, comprising: a vibration detector comprising one accelerometer disposed at the left and right sides of the steering wheel in the same direction and an accelerometer disposed at opposite sides of the steering wheel; and a vibration signal for amplifying the vibration signal detected by the vibration detector. It is attached to an amplifier, a vibration signal separation detecting unit for separating the vibration signal amplified by the vibration signal amplifier into a digital signal by detecting the shimmy, shake and total vibration signal, and a slip ring installed to be rotatable with the axles of the front wheels. Vibration measurement of the steering wheel of the vehicle comprising a phase detector configured to attach an optical sensor and a rotary encoder to the adapter, and a detection signal processor formed of a computer, a monitor, and a peripheral device to process and display the separated detected vibration signal and the detected phase. And an analysis device.

Description

Vibration measurement and analysis device of car steering wheel

1 is a schematic configuration diagram of the present invention.

2 is a diagram showing that there is a phase difference between two front wheels measured using the present invention.

3 is a diagram showing the rate at which there is no phase difference between two wheels measured using the present invention.

* Explanation of symbols for main parts of the drawings

1,2: accelerometer 3: handle

4A, 4B: Optical sensor 5A, 5B: Rotary encoder

6A, 6B: Slip ring 7A, 7B: Adapter

9: axle 10A, 10B: wheels

100: vibration detection unit 200: vibration signal separation detection unit

300: phase detection unit 400: detection signal processing unit

θ: Phase difference 500: Vibration signal amplifier

The present invention relates to an apparatus for measuring and analyzing vibration of a vehicle steering wheel.

Generally, vibrations caused by misalignment of the vehicle and unbalance of tires during vehicle driving are transmitted through the suspension to the steering wheel and the inside of the vehicle. At this time, the steering wheel of the car is transmitted by the vibration vibration shake up, down, left and right and the shimmy vibration trembling in the circumferential direction, such vibration lowers the driver's riding comfort and increases the fatigue of the driver when driving for a long time to harm the health do.

Conventionally, in order to determine the cause of the vibration of the steering wheel, one accelerometer was installed above and below the steering wheel to measure and analyze the vibration of the steering wheel. However, the vibration of the handle thus measured represents only the total vibration, and it is difficult to identify the cause of vibration because the vibration cannot be separately measured by the shake and the shimmy vibration. In addition, the phase difference between the two wheels could not be measured, and thus the effect of the phase difference between the two wheels on the steering wheel vibration could not be evaluated.

Accordingly, an object of the present invention is to provide a vibration measurement and analysis device for a vehicle handle that can determine the vibration cause of the steering wheel by analyzing the vibration of the steering wheel and shake and shimmy vibration while driving the vehicle.

Another object of the present invention is to provide a vibration measuring and analyzing device of a car steering wheel that can measure the phase difference of the front wheels while driving the vehicle to identify the cause of the vibration of the steering wheel, and to evaluate the effect of the phase difference of the front wheels on the vibration of the steering wheel. It is to.

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

As shown in FIG. 1, the present invention provides a vibration detecting unit comprising a handle 3, one accelerometer 2 installed in the same direction on the left and right sides of the handle 3, and an accelerometer 1 installed in the opposite direction on the upper and lower sides. (100), the vibration signal amplifier 500 for amplifying the vibration signal detected by the vibration detection unit 100, and the vibration signal amplified by the vibration signal amplifier 500 is separated into a shimmy, a shake and a total vibration signal To the adapter (7A, 7B) attached to the vibration signal separation detection unit 200 for converting into a digital signal, and slip rings (6A, 6B) rotatably installed with the axles (9) of the front wheels (10A, 10B). Phase detection unit 300 comprising optical sensors 4A and 4B and rotary encoders 5A and 5B, and a computer, a monitor, and a peripheral device to process and display the separated detected vibration signal and the detected phase. It consists of a detection signal processing unit 400.

Effects of the present invention configured as described above are as follows.

Vibration caused by misalignment of the vehicle and unbalance of tires during vehicle driving is transmitted to the steering wheel 3 of the vehicle. The vibration detector 100 amplifies the vibration signal transmitted to the handle 3 with the vibration signal amplifier 500 by accelerometers 1 and 2 installed on the top, bottom, left and right sides of the handle 3 to the vibration signal separation detector 100. send .

The vibration signal separation detecting unit 200 synthesizes two vibration signals detected by the accelerometer 1 and amplified by the vibration signal amplifier 500, thereby canceling the shake vibrations up, down, left, and right, and thus shaking the shimmy vibration in the circumferential direction. A signal is detected, and a shake vibration signal that is shaken up, down, left, and right is detected by synthesizing two vibration signals detected by the accelerometer 2 and amplified by the vibration signal amplifier 500 to cancel the shimmy vibration that is circulated in the circumferential direction. In addition, the vibration signal separated by the shake and the Shimi are synthesized and the average vibration signal is detected, and the data obtained by converting the shake, Shimi and all vibration signals into digital signals are sent to the detection signal processor 400.

On the other hand, the phase detector 300 detects that the front wheels 10A, 10B rotate by the optical sensors 4A, 4B, and generates a pulse for each revolution, and each wheel 10A by the rotary encoders 5A, 5B. 1B intervals of 10B are read at 1 degree intervals, and the detected phases of the wheels 10A and 10B are sent to the detection signal processing unit 400.

The detection signal processing unit 400 compares the shake, shimmy and total vibration signal data input from the vibration signal separation detection unit 200 with the respective standard signal data to handle misalignment of the vehicle, unbalance of the tire, and abnormality of the steering system. Determine the cause of vibration in (3). Also, by comparing the phases of the two wheels 10A and 10B detected by the phase detection unit 300 using the encoder, if the phase difference θ exists as shown in FIG. 2, the cause of vibration of the handle 3 may be caused by the unbalance of the tire. It judges that it originated, and evaluates the influence which the phase difference (theta) of two wheels 10A, 10B has on the vibration of the handle 3. And if the phase difference (theta) of the two wheels 10A and 10B does not exist like FIG. 3, it is determined that the vibration cause of the steering wheel 3 is due to the misalignment of the vehicle.

As described above, according to the present invention, the vibration of the steering wheel of the car is measured separately by shake, shimmy, and total vibration, and compared with each of the standard vibrations, so that the cause of vibration of the steering wheel can be accurately understood. In addition, by measuring the phase of the two front wheels, it is easy to determine whether the steering wheel vibration is due to misalignment of the vehicle or the tire unbalance due to the phase difference of the two wheels. The effect is to assess the impact.

Claims (1)

In the vibration measuring and analyzing apparatus of the automobile steering wheel, a vibration detection unit comprising a handle (3), one accelerometer (2) installed in the same direction on the left and right of the handle (3) and an accelerometer (1) installed in the opposite direction up and down ( 100), the vibration signal amplifier 500 for amplifying the vibration signal inspected by the vibration detection unit 100, and the vibration signal amplified by the vibration signal amplifier 500 is separated into a shimmy, a shake and a total vibration signal Adapters 7A and 7B attached to the vibration signal separation detecting unit 200 for converting into a digital signal and slip rings 6A and 6B rotatably installed with the axles 9 of the front wheels 10A and 10B. Phase detection unit 300, which is equipped with optical sensors 4A, 4B and rotary encoders 5A, 5B, and a computer, monitor, and peripheral device to process and display the separately detected vibration signal data and the detected phase. Automobile handle having a detection signal processing unit 400 formed of Vibration measurement and analysis apparatus.