KR20210072219A - noise determination apparatus and method for actuator apparatus - Google Patents

Abstract

The present invention discloses a noise determination apparatus and method for measuring noise of an actuator device. The noise determination apparatus may include: an output current detection unit detecting a current supplied from a power supply to the actuator device; a current waveform generation unit receiving the detected current and generating a current waveform of the detected current; and a non-defective product determination unit determining whether or not the actuator device has passed a noise test based on the current waveform. Accordingly, the noise determination apparatus and method can quantitatively measure noise of the actuator device and thereby improve reliability of measurement.

Description

Noise determination apparatus and method for actuator apparatus

The present invention relates to a noise determining device and method for an actuator device.

Various devices are installed in automobiles to improve the safety of the vehicle and the convenience of the driver. Among them, the steering system is a device that allows the driver to freely change the direction of the vehicle by turning the steering wheel. It is a device that assists the driver to move the vehicle in the desired direction by arbitrarily changing the center of rotation in which the

In recent years, as the concept of a vehicle has changed according to an increase in income and an improvement in living standards, the existing simple transportation system is now being established as a living space. In addition, as time spent in automobiles increases, the development of more comfortable and comfortable automobiles is required, and the advancement of various devices is rapidly progressing thanks to this. As one of these trends, the tilt and telescopic steering system using a drive motor that adjusts the relative position of the steering wheel with respect to the driver so that the driver can easily hold the steering wheel and drive comfortably is gradually expanding.

Here, the tilt and telescope steering system using a driving motor (Motor Driven Steering Column System) means adjusting the position of a steering wheel used in a passenger car by the driving force of the motor. and telescope operation.

First, the tilt operation is to adjust the fixed angle of the steering wheel according to the driver's posture sitting in the driver's seat, and the telescope operation is to lengthen or shorten the length of the steering column according to the driver's body type to increase the distance between the steering wheel and the driver. is to regulate

An actuator including a motor is used in the device for such tilt and telescope operation. A separate gearbox may be coupled to the actuator to perform a deceleration function, which generates strong torque and enables smooth operation.

However, a periodic sound (eg, eng-eng) is generated according to the rotation and jogging of the worm wheel operating inside the actuator. These periodic sounds are measured by the examiner using the five senses. Therefore, since measurement of periodic sound using the human senses is a subjective judgment, there is a problem in that measurement reliability is low.

On the other hand, the conventional technology for measuring noise is disclosed in Korean Patent Registration No. 10-1378660. This patent discloses a technique for measuring a dB value for each frequency band. However, according to this patented technology, acoustically audible noise (eg, eng-eng) could not be specified.

Republic of Korea Patent No. 10-1378660

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art as described above, and an object of the present invention is to provide a noise determining device and method capable of quantitatively measuring the noise of an actuator device.

In order to achieve the above object, the noise determination device of the actuator device according to an embodiment of the present invention is a noise determination device for measuring the noise of the actuator device, the output for detecting the current supplied from the power supply to the actuator device current detection unit; a current waveform generator configured to receive the detected current and generate a current waveform of the detected current; and a non-defective product determining unit that determines whether or not the actuator device passes the noise test based on the current waveform.

The noise determination device further includes a deviation extracting unit for extracting a deviation between a maximum value and a minimum value of current from the current waveform, and the quality determination unit determines whether the deviation is equal to or less than a predetermined threshold value, and determines whether the deviation is equal to or less than the predetermined threshold value. If it is less than the threshold value, it may be determined that the actuator device has passed the noise test, and if the deviation is greater than the predetermined threshold value, it may be determined that the actuator device has failed the noise test.

The quality determination unit may determine whether the maximum value of the current waveform is greater than or equal to a first reference value, and when the maximum value of the current waveform is greater than or equal to the first reference value, it may be determined that the actuator device has failed the noise test.

The quality determination unit detects the maximum value of the current from the current waveform and counts the number of times the maximum value of the current is greater than or equal to the second reference value, and if the number of times the maximum value of the current is greater than or equal to the second reference value is greater than or equal to a predetermined number of times, the actuator device is It can be judged that the noise test has failed.

The quality determination unit determines whether the average of the maximum values of the current for a set time is obtained from the current waveform, determines whether the average of the maximum values of the current is equal to or greater than a third reference value, and the average of the maximum values of the current is the second 3 If it is higher than the standard value, it can be determined that the actuator device has failed the noise test.

A noise determination method of an actuator device according to another embodiment of the present invention comprises the steps of: detecting a current supplied from a power supply to the actuator device; receiving the detected current and generating a current waveform of the detected current; and determining whether the actuator device passes a noise test based on the current waveform.

The noise determination method further comprises the step of extracting a deviation between a maximum value and a minimum value of the current from the current waveform, and the step of determining whether the actuator device passes the noise test includes the step of determining whether the deviation is a predetermined threshold judging whether the deviation is less than or equal to the predetermined threshold value, determining that the actuator device has passed the noise test, and if the deviation is greater than the predetermined threshold value, the actuator apparatus performs the noise test It may include a step of judging that it has been rejected.

The step of determining whether the actuator device passes the noise test includes determining whether the maximum value of the current waveform is greater than or equal to a first reference value, and if the maximum value of the current waveform is greater than or equal to the first reference value, the actuator apparatus may include determining that the noise test has failed.

The step of determining whether the actuator device passes the noise test includes: detecting a maximum value of the current from the current waveform; counting the number of times the maximum value of the current is equal to or greater than a second reference value; and the maximum of the current. If the number of times the value is greater than or equal to the second reference value is greater than or equal to a predetermined number of times, the method may include determining that the corresponding actuator device has failed the noise test.

The step of determining whether the actuator device passes the noise test includes: obtaining an average of the maximum current values for a set time from the current waveform; determining whether the average of the maximum current values is equal to or greater than a third reference value , and when the average of the maximum values of the current is equal to or greater than the third reference value, determining that the corresponding actuator device has failed the noise test.

According to the noise determination device according to the present invention as discussed above, noise can be quantitatively measured, and accordingly, the problem of low measurement reliability when judging the size of noise using the five senses of a conventional inspector has been solved. .

1 is a perspective view showing the configuration of a gearbox-integrated actuator device to which the present invention is applied.
Figure 2 is a perspective view showing a connection structure between the motor shaft and the operating means constituting the gearbox-integrated actuator device of Figure 1;
3 is a view showing a connection relationship between the noise determination device and the actuator device according to the present invention.
4 is a view showing a block diagram of a noise determining device according to the present invention.
5 is a diagram showing an example of a current waveform generated according to the present invention.
6 is a view showing a method of measuring noise in the noise determining device according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the components from other components, and the essence, order, or order of the components are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

The present invention discloses a noise determination device for measuring the noise of an actuator device. For example, the present invention can be applied to a gear assembly-integrated actuator device.

1 is a perspective view showing an example of a gearbox-integrated actuator device to which the present invention is applied, and FIG. 2 is a perspective view showing a connection structure between a motor shaft and an operating means constituting the gearbox-integrated actuator device of FIG. 1 .

A gear assembly-integrated actuator device to which the present invention is applied (hereinafter referred to as an 'actuator device') is a device for adjusting a tilt operation of a steering device, that is, a fixed angle of the steering device.

1 and 2, when the interlocking shaft 65 is rotated in the gear assembly-integrated actuator device, the lead nut 80 moves linearly while rotating the hinge (not shown) and finally the steering device is operated. rotate As a result, the actuator device enables linear movement of the lead nut 80 .

The outer appearance and skeleton of the actuator device are formed by the housing 10 . The housing 10 is positioned between the power means 30 and the operation means, and therein is a deceleration means. At least a part of the power means 30 and at least a part of the operation means are installed inside the housing 10 . The housing 10 may be made of a light plastic injection molding material, but in this embodiment, it is manufactured by die casting.

The power means 30 is installed in the vertical direction of the housing 10 and provided with a motor serves to provide rotational force. The power means 30 is largely composed of a yoke assembly, an armature assembly and a brush card assembly 50 .

A driving gear 48 is provided on the rotor shaft 45 of the armature assembly.

In the housing 10, the rotor shaft 45 of the power means 30 and the driving gear 48 constituting the deceleration means are positioned. In addition, the interlocking shaft 65 of the operating means is accommodated in the housing 10 perpendicular to the rotor shaft 45 of the power means 30 . A worm wheel gear 68 constituting a reduction means is positioned at a portion of the end of the interlocking shaft 65 . Accordingly, the driving gear 48 and the worm wheel gear 68 of the horizontal part 25 are engaged to constitute a deceleration means.

In other words, the driving gear 48 constitutes a reduction means together with the worm wheel gear 68 , and is rotated together with the rotor shaft 45 . In this embodiment, the driving gear 48 is a worm gear.

The brush card assembly 50 supports the brush through a brush holder (not shown) and a brush spring (not shown). The brush card assembly 50 transmits an externally applied current through the main power supply unit 51 to the rotor of the armature assembly.

The operating means serves to convert the rotational motion into a linear motion of the lead nut 80 while rotating by receiving the rotational force of the power means 30 . The operating means 60 is installed in the housing 10 in the other direction orthogonal to the power means 30 .

The operating means (60) is rotated in association with the rotation of the rotor shaft (45) and has a rotation shaft in a direction perpendicular to the rotor shaft (45) and at least a part of the interlocking shaft ( 65). As a result, the interlocking shaft 65 has a rotation shaft perpendicular to the rotor shaft 45 . At least a part of the interlocking shaft 65 is located inside the housing 10 .

In this way, both the rotor shaft 45 and the interlocking shaft 65 are located inside one housing 10 .

A lead screw 66 is provided on the outer surface of the interlocking shaft 65 . The lead screw 66 is a screw thread, and may be integrally formed with the interlocking shaft 65 or assembled to the interlocking shaft 65 after being made as a separate product. The lead screw 66 is a portion to which the lead nut 80 is coupled, and is engaged with the lead nut 80 to allow the lead nut 80 to move in a straight line.

The interlocking shaft 65 has a worm wheel gear 68 . The worm wheel gear 68 is coupled to the interlocking shaft 65 and rotates together, and is meshed with the driving gear 48 of the rotor shaft 45 . The worm wheel gear 68 interlocks with the driving gear 48 to make the rotation direction of the interlocking shaft 65 orthogonal to the rotation direction of the rotor shaft 45 . To this end, in the present embodiment, the driving gear 48 is a worm gear, and the worm wheel gear 68 is configured as a worm wheel meshing with the worm gear.

The driving gear 48 and the worm wheel gear 68 constitute a deceleration means. The decelerating means is for reducing the rotational speed by the power means 30 and increasing the power at the same time, and is primarily decelerated by interlocking the driving gear 48 and the worm wheel gear 68 . As described above, the driving gear 48 is a worm gear, and the worm wheel gear 68 is composed of a worm wheel, and a reduction ratio is determined according to a gear ratio between the worm gear and the worm wheel. The housing 10 may also be viewed as a part constituting the deceleration means.

Next, we will look at the operation of the actuator. As the lead nut 80 moves, the bracket (hinge) coupled to the lead nut 80 rotates to change the fixed angle of the steering device. The linear movement of the lead nut 80 can be made naturally by the power means 30 and the operation means 60 and the deceleration means provided therebetween.

First, when no current is applied from the outside through the main power supply unit 51 to the brush card assembly 50, it is transmitted to the rotor of the armature assembly and the rotor shaft is rotated. Accordingly, the worm gear which is the driving gear 48 connected to the rotor shaft 45 is also rotated.

The driving gear 48 rotates the worm wheel gear 68 while rotating inside the housing 10 to perform a deceleration function. The driving gear 48 and the worm wheel gear 68 serve as decelerating means, and at the same time convert the rotational direction of the rotor shaft 45 and the rotational direction of the interlocking shaft 65 orthogonally, and reduce the rotational speed to perform a deceleration function. . Of course, in this process, the torque is increased so that the tilt angle of the steering system can be smoothly rotated.

As shown in FIG. 2 , the rotor shaft 45 is magnetized by the current supplied through the brush card assembly 50 and is rotated in the direction of the arrow ①. According to the rotation of the rotor shaft 45, the driving gear 48 is rotated in the direction of the arrow ②. When the driving gear 48 is rotated in the direction of the arrow ②, it is engaged with the driving gear 48 and the interlocking shaft 65 is rotated in the direction of the arrow ③. According to the rotation of the driving gear 48, the interlocking shaft 65 is rotated in the direction of the arrow ④.

The interlocking shaft 65 is rotated in the direction of the arrow ④, and on the outer surface of the interlocking shaft 65, the lead nut 80 coupled to the lead screw 66 is engaged with the lead screw 66 to linearly move in the direction of the arrow ⑤

As described above, when the driving gear 48 is rotated according to the rotation of the rotor shaft 45 , it is engaged with the driving gear 48 and the interlocking shaft 65 is rotated. That is, when the driving gear 48 is rotated, the worm wheel gear formed on the outer ring of the interlocking shaft 65, that is, the worm wheel gear 68 formed on the outer ring of the worm wheel is rotated. The worm wheel gear 68 has a rotational roundness (Run-Out) of 0 to 0.1 and generates a periodic noise. In other words, a regular load noise is generated according to the rotation period of the driving gear 48 and the worm wheel gear 68 .

The worm wheel gear 68 is a plastic injection gear, and a difference in load noise (negative pressure) occurs due to a difference in the runout of the gear part. That is, the injection gear inside the motor has a unique positive rotational roundness, and a unique audible noise is generated for each rotation cycle according to the magnitude of this positive rotation.

The inventor of the present application found that the cycle of periodic noise according to the amount of run-out of the injection gear is similar to the cycle of variation of the operating current of the actuator device. Accordingly, the present invention can measure the noise quantitatively by detecting the variation amount of the operating current of the actuator device.

Rotational roundness (Run-out) is a quantity indicating the defective state of roundness and verticality existing on the axis of the rotating machine, and it is one of the items to be checked before aligning the axis. The shafts, coupling hubs, impellers, or other parts rigidly attached to the shaft of any rotating machine also have some degree of rotational roundness (from 1 nm for small ones to 3 mm for large ones).

3 is a diagram illustrating a connection relationship between the noise determination device and the actuator device according to the present invention, and FIG. 4 is a block diagram of the noise determination device according to the present invention.

Referring to FIG. 3 , the power supply 100 supplies power to the main power unit included in the brush card assembly 50 of the actuator device. The noise determination device 200 detects a driving current supplied from the power supply 100 to the actuator device.

When the noise determination device 200 detects the driving current supplied to the actuator device, the detected driving current is drawn as a graph over time to generate a current waveform.

After generating the current waveform, the noise determination device 200 extracts a deviation obtained by subtracting the minimum value from the maximum value of the current from the current waveform. The noise determination device 200 compares the current deviation with a threshold value and uses it as a pass or fail criterion for periodic noise.

Referring to FIG. 4 , the noise determining device 200 includes an output current detecting unit 210 , a current waveform generating unit 220 , a deviation extracting unit 230 , and a non-defective product determining unit 240 .

The output current detection unit 210 detects a driving current supplied from the power supply 100 to the actuator device. The current waveform generator 220 generates a current waveform by drawing the detected driving current as a graph over time.

According to an embodiment, the current waveform generator 220 may provide the detected driving current to the deviation extractor 230 .

When the current waveform is provided from the current waveform generator 220 , the deviation extractor 230 extracts a deviation obtained by subtracting the minimum value from the maximum value of the current from the current waveform. 5 shows an example of a current waveform generated according to the present invention.

Referring to FIG. 5 , the driving current supplied to the actuator may be represented by a current waveform as shown in FIG. 5 . The maximum and minimum values of the current in the current waveform can be obtained.

For example, the deviation extractor 230 may calculate the deviation of the current waveform according to Equation 1 below.

Here, Max is the maximum value of the current, Min is the minimum value of the current, and Δy is the deviation.

According to an embodiment, the non-defective product determining unit 240 receives the deviation of the current waveform from the deviation extracting unit 230 and compares the deviation of the current waveform with a predetermined threshold value. If the deviation of the current waveform is less than a predetermined threshold value, the non-defective product determination unit 240 determines that the actuator device has passed the noise test. If the deviation of the current waveform is greater than a predetermined threshold value, the non-defective unit 240 determines that the corresponding actuator device has failed the noise test.

According to another exemplary embodiment, the current waveform generating unit 220 provides the detected driving current to the non-defective product determining unit 240 . In this case, the non-defective unit 240 detects the maximum value of the current from the current waveform, and when the maximum value of the current is equal to or greater than the first reference value, it may be determined that the actuator device has failed the noise test.

According to another embodiment, the non-defective product determining unit 240 detects the maximum value of the current from the current waveform and counts the number of times the maximum value of the current is equal to or greater than the second reference value. If the number of times the maximum value of the current is equal to or greater than the second reference value is equal to or greater than a predetermined number of times, the non-defective unit 240 may determine that the actuator device has failed the noise test.

According to another embodiment, the non-defective product determination unit 240 obtains an average of the maximum values of the current for a set time from the current waveform, determines whether the average of the maximum values of the current is equal to or greater than a third reference value, and If the average of the maximum values is equal to or greater than the third reference value, it may be determined that the corresponding actuator device has failed the noise test.

6 is a diagram illustrating a method of measuring noise in a noise determining device according to an embodiment of the present invention.

First, the noise determination device 200 detects an output current output from the power supply to the actuator device in step S310.

When the noise determination device 200 detects the driving current supplied to the actuator device in step S320, the detected driving current is drawn as a graph over time to generate a current waveform.

The noise determination device 200 generates a current waveform in step S330, and then extracts a deviation from the current waveform by subtracting the minimum value from the maximum value of the current. Next, the noise determination device 200 compares the current deviation with a threshold value in step S340 of the noise determination device 200 . Specifically, the noise determination apparatus 200 determines whether the deviation of the current waveform is less than or equal to a predetermined threshold in step S340.

When the deviation of the current waveform is less than or equal to a predetermined threshold value, the noise determination device 200 may determine that the corresponding actuator device has passed the noise test in step S350 .

Also, when the deviation of the current waveform is greater than a predetermined threshold value, the noise determination device 200 may determine that the corresponding actuator device has failed the noise test.

According to another embodiment, although not shown in the flowchart of the method, the noise determination apparatus 200 determines whether the maximum value of the current waveform is greater than or equal to a first reference value, and if the maximum value of the current waveform is greater than or equal to the first reference value, It may be determined that the actuator device has failed the noise test.

According to another embodiment, although not shown in the flowchart of the method, the noise determination device 200 detects the maximum value of the current from the current waveform and counts the number of times the maximum value of the current is greater than or equal to a second reference value, and the current If the number of times the maximum value of is equal to or greater than the second reference value is equal to or greater than a predetermined number of times, it may be determined that the actuator device has failed the noise test.

According to another embodiment, although not shown in the flowchart of the method, the noise determination device 200 obtains the average of the maximum values of the current for a set time from the current waveform, and determines whether the average of the maximum values of the current is equal to or greater than the third reference value. and if the average of the maximum values of the current is equal to or greater than the third reference value, it may be determined that the corresponding actuator device has failed the noise test.

As described above, in the present invention, since the noise determination device 200 can quantitatively measure noise, the problem of poor measurement reliability when judging the size of noise using the five senses of an inspector has been solved.

In the above, even though all components constituting the embodiment according to the present invention have been described as being combined or operated in combination as one, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be inherent, unless otherwise stated, excluding other components. Rather, it should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Commonly used terms such as terms defined in the dictionary should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: power supply 200: noise determination device
210: output current detection unit 220: current waveform generation unit
230: deviation extraction unit 240: good product determination unit

Claims (10)

In the noise determination device for an actuator device,
an output current detection unit for detecting a current supplied from a power supply to the actuator device;
a current waveform generator configured to receive the detected current and generate a current waveform of the detected current; and
and a non-defective product judging unit for judging whether or not the actuator device passes the noise test based on the current waveform. According to claim 1,
Further comprising a deviation extracting unit for extracting a deviation between the maximum value and the minimum value of the current in the current waveform,
The quality determination unit determines whether the deviation is less than or equal to a predetermined threshold, and if the deviation is less than or equal to the predetermined threshold, it is determined that the actuator device has passed the noise test, and if the deviation is greater than the predetermined threshold, the actuator Noise determination device, characterized in that the device determines that the noise test has failed. According to claim 1,
The quality determination unit determines whether the maximum value of the current waveform is greater than or equal to a first reference value, and if the maximum value of the current waveform is greater than or equal to the first reference value, it is determined that the actuator device has failed the noise test judgment device. According to claim 1,
The quality determination unit detects the maximum value of the current from the current waveform and counts the number of times the maximum value of the current is greater than or equal to a second reference value, and if the number of times the maximum value of the current is greater than or equal to the second reference value is greater than or equal to a predetermined number of times, the actuator device is a noise judging device, characterized in that it is determined that the noise test has failed. According to claim 1,
The quality determination unit obtains an average of the maximum values of the currents for a set time from the current waveform, determines whether the average of the maximum values of the currents is equal to or greater than a third reference value, and if the average of the maximum values of the currents is equal to or greater than the third reference value, A noise determination device, characterized in that it is determined that the actuator device has failed the noise test. In the noise determination method for an actuator device,
detecting a current supplied from a power supply to the actuator device;
receiving the detected current and generating a current waveform of the detected current; and
and determining whether the actuator device passes the noise test based on the current waveform. 7. The method of claim 6,
Further comprising the step of extracting a deviation between the maximum value and the minimum value of the current in the current waveform,
The step of determining whether the actuator device passes the noise test is
determining whether the deviation is less than or equal to a predetermined threshold;
determining that the actuator device has passed the noise test if the deviation is equal to or less than the predetermined threshold value; and
and determining, by the actuator device, that the noise test has failed if the deviation is greater than the predetermined threshold value. 7. The method of claim 6,
The step of determining whether the actuator device passes the noise test is
determining whether the maximum value of the current waveform is equal to or greater than a first reference value; and
and determining that the actuator device has failed the noise test if the maximum value of the current waveform is equal to or greater than the first reference value. 7. The method of claim 6,
The step of determining whether the actuator device passes the noise test is
detecting a maximum value of the current from the current waveform;
counting the number of times the maximum value of the current is equal to or greater than a second reference value; and
and determining that the actuator device has failed the noise test if the number of times the maximum value of the current is equal to or greater than the second reference value is greater than or equal to a predetermined number of times. 7. The method of claim 6,
The step of determining whether the actuator device passes the noise test is
obtaining an average of the maximum values of current for a set time from the current waveform;
determining whether the average of the maximum values of the current is equal to or greater than a third reference value; and
and determining that the actuator device has failed the noise test if the average of the maximum values of the current is equal to or greater than the third reference value.

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