JP2022021021A - Device for restraining vehicle from generating abnormal noise - Google Patents

Abstract

To restrain a vehicle from generating a groan noise associated with a hydraulic brake.SOLUTION: A device for restraining a vehicle from generating an abnormal noise comprises: detection means (18) for detecting a groan noise; band changing means (16) for changing a use band of hydraulic pressure of a hydraulic brake (11) with respect to each vehicle speed of the vehicle so as to reduce the groan noise, on the basis of the detected groan noise; and control means (14) for controlling an actuator (12) of the hydraulic brake so as to adjust the hydraulic pressure at the changed use band.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical field of a vehicle noise suppressing device for suppressing brake abnormal noise, for example, in a vehicle equipped with a hydraulic brake.

As a device of this type, for example, by controlling the hydraulic band in which a brake abnormal sound called a brake grown, a goo sound or a grone sound (simply referred to as “grown sound” in the present application) is likely to be generated is controlled so as not to be used as much as possible. A technique for preventing the generation of sound has been proposed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 08-0911885

However, according to the above-mentioned Patent Document 1, when the hydraulic band in a predetermined range is not used, the parts and parts related to the brake such as the brake pad, the brake disc, the brake oil, and the actuator output are subject to aging or deterioration over time. As a result, when the grown sound is generated outside the hydraulic band within the predetermined range, there is a technical problem that the generation of the grown sound cannot be prevented.

The present invention has been made in view of, for example, the above-mentioned technical problems, and provides a vehicle noise suppressing device capable of suppressing grown noise even if there is a change over time or deterioration over time in a portion of a vehicle related to a brake or the like. Is the subject.

One aspect of the vehicle noise suppressing device according to the present invention is a vehicle that suppresses the grown sound related to the hydraulic brake in a vehicle provided with a hydraulic brake and an actuator for adjusting the hydraulic pressure in the hydraulic brake in order to solve the above problems. It is a sound suppression device, and based on the detection means for detecting the grown sound and the detected grown sound, the usage band of the hydraulic pressure for each vehicle speed of the vehicle is changed so that the grown sound is reduced. It is characterized by comprising a band changing means and a control means for controlling the actuator so as to adjust the hydraulic pressure in the changed used band.

According to one aspect of the vehicle noise suppressing device according to the present invention, the grown sound is detected by the detecting means while the vehicle is running or when the vehicle starts or stops. Then, based on the collected grown sound, the used band of the hydraulic pressure of the brake is changed by the band changing means so that the grown sound is reduced. Further, the actuator is controlled by the control means so as to adjust the hydraulic pressure in the changed use band. Therefore, the hydraulic band where the grown noise is generated changes due to changes over time or deterioration over time in the parts and parts related to the brake, and the grown noise that would be generated if no measures are taken is generated. Can be prevented.

Such an action and effect according to the present invention will be further clarified by the embodiment of the invention described below.

It is a block diagram of the vehicle noise suppression device which concerns on embodiment. It is a characteristic diagram which shows the region where the grown sound is generated for each vehicle speed and each hydraulic pressure which concerns on embodiment. It is a flowchart which shows the flow of the process carried out by the vehicle noise suppression apparatus which concerns on embodiment. It is a characteristic diagram which shows the calculation of the generation area at the time of the occurrence of the grown sound for each vehicle speed and each hydraulic pressure which concerns on embodiment. It is a characteristic diagram which shows the use band of the hydraulic pressure for each vehicle speed changed to reduce the grown sound which concerns on embodiment as a map.

First, the overall configuration of the embodiment will be described with reference to FIG.

As shown in FIG. 1, the vehicle noise suppressing device 10 according to the embodiment includes a hydraulic brake 11, a brake actuator 12 for adjusting hydraulic pressure, a brake ECU (Engine Control Unit) 13 for controlling the brake actuator 12, and a grown sound. It is configured to include a sensor 18 for detecting.

The hydraulic brake 11 is configured to be pushed by hydraulic pressure in a brake pad (not shown) cylinder holding a disc rotor (not shown) and to obtain braking force by friction. The brake actuator 12 is electrically connected to an actuator control unit 14 described later of the brake ECU 13, and is configured to adjust the hydraulic pressure applied to the hydraulic brake 11 based on control information from the brake ECU 13.

The brake ECU 13 includes an actuator control unit 14 that constitutes an example of the "control means" according to the present embodiment, a grown sound determination unit 15 that constitutes an example of the "determination means" according to the present embodiment, and a "glone sound determination unit 15" according to the present embodiment. It is configured to include a map changing unit 16 that constitutes an example of "band changing means".

As described above, the actuator control unit 14 controls the brake actuator 12 so that the hydraulic brake 11 is loaded with hydraulic pressure that can avoid the generation of a grown sound by referring to the map 17 described later when the vehicle is braked. It is configured as follows.

The grown sound determination unit 15 is configured to determine whether or not a grown sound has been generated based on the detection result of the sensor 18 that detects the grown sound in the hydraulic brake 11. As will be described later, the determination may be made in light of a predetermined criterion (for example, a predetermined threshold value such as an occurrence rate).

The sensor 18 constitutes an example of the "detection means" according to the present embodiment, and detects the frequency characteristics and the magnitude of the sound specified as the grone sound (for example, about 100 Hz to 300 Hz). The sensor 18 may be configured to include, for example, a sound collecting microphone, or may be configured to include, in addition to or in place of the sound collecting microphone, an accelerometer having sensitivity in a band capable of detecting grown sound. May be good. In the present embodiment, the sensor 18 and the grown sound determination unit 15 are configured to detect the occurrence rate or the occurrence frequency of the grown sound whose volume is louder than a predetermined threshold value.

The map changing unit 16 is electrically connected to the map 17, and when it is determined by the grown sound determining unit 15 that a grown sound is detected, the map changing unit 16 is configured to update the map 17 indicating the grown sound generating region. The grown sound generation region is a region specified with the vehicle speed and the hydraulic pressure as parameters, and is a region associated with the hydraulic pressure of the hydraulic brake 11 which is considered to easily generate the grown sound for each vehicle speed. By not using the hydraulic pressure in the grown sound generation region as the hydraulic pressure during braking as much as possible (passing through in a short time), it is possible to prevent the generation of the grown sound.

FIG. 2 shows an example of the grown sound generation region A1 (dot pattern portion) shown by the map 17. In this example, the vehicle speed and the hydraulic pressure at the boundary between the grown sound generation region A1 and the hydraulic pressure usage band A2 (the region outside the grown sound generation region A1) have a linear relationship, and the boundary is the vehicle speed (Y-axis). It is shown as the first linear graph G1 in the two-dimensional coordinates of hydraulic pressure (X-axis). However, the aspect of the map 17 is not limited to the aspect shown in FIG. The mode of the boundary between the grown sound generation region A1 and the used band A2 can be set based on, for example, the vehicle type, the braking performance, the sensor performance, and the like.

The map 17 is rewritten by the brake ECU 13 when a predetermined condition is satisfied with respect to the grown sound. An example of a processing routine performed by the brake ECU 13 for the rewriting will be described with reference to FIG. This processing routine is repeated periodically, irregularly, or continuously in a moving vehicle.

In this processing routine, first, it is determined whether or not a grown sound is generated based on the detection result of the sensor 18 (step S100). Specifically, the determination is based on various information obtained from the detection result of the sensor 18 (for example, the generation rate and frequency of the grown sound that is louder than the predetermined threshold value, the volume of the grown sound and the vibration, etc.). Judgment is made in light of. Therefore, it is possible to semi-determine whether or not the generation state of the grown sound is such that the map 17 needs to be rewritten.

If the negative determination in step 100 is made (step S100: No), the processing routine is terminated. On the other hand, if an affirmative determination is made (step S100: Yes), it is determined whether or not the hydraulic pressure for the current vehicle speed (that is, when the grown sound is generated) is outside the grown sound generation region (step S101). Specifically, on the map 17, it is determined whether or not the current point P indicating the current vehicle speed and hydraulic pressure status (that is, when the grown sound is generated) is in a region (used band A2) outside the grown sound generation region A1. do. An example of the current state point P is shown in FIG. As shown in FIG. 4, when it is determined that the current point P is in the region (used band A2) outside the grown sound generation region A1, that is, when the affirmative determination is made in step S101 (step S101: Yes). The process proceeds to step S102. On the other hand, if it is not determined that the current point P is in the region (used band A2) outside the grown sound generation region A1, that is, if a negative determination is made in step S101 (step S101: No), the processing routine is terminated.

In step S102, the additional area A3 is calculated. The additional area A3 is an area to be added to the grone sound generation area A1 as an area in which the grown sound is likely to be generated. As shown in FIG. 4, the additional region A3 in the present embodiment is calculated as a shaded portion sandwiched between the second linear graph G2 and the first linear graph G1 passing through the current point P in the map 17. That is, the additional region A3 is calculated as a region adjacent to the grown sound generation region A1 while maintaining the relationship (linear relationship) between the vehicle speed and the hydraulic pressure at the boundary portion with the use band A2. It should be noted that the additional area A3 suffices as long as it is an area including the current point P, and the mode thereof can be set based on, for example, the vehicle type, the braking performance, the sensor performance, and the like.

After the additional region A3 is calculated, it is subsequently determined whether or not the generation rate of the grown sound in the additional region A3 is equal to or greater than a predetermined threshold value (step S103). As this occurrence rate, for example, the ratio of the number of times that the current state point indicating the vehicle speed and the hydraulic pressure at the time of the grown sound is in the additional region A3 in the predetermined period to the number of brakings can be considered. The determination process regarding the generation of the grown sound for obtaining this occurrence rate may be the same as the determination process in step S101. By the determination in step S103, it can be determined whether or not the brake parts and the like have deteriorated over time. If a negative determination is made in step S103 (step S103: No), it means that the deterioration with time has not occurred, and the processing routine is terminated.

On the other hand, if an affirmative determination is made in step S103 (step S103: Yes), it means that the above-mentioned deterioration with time has occurred, and the map 17 is rewritten (step S104). Specifically, as shown in FIG. 5, the area (A1 + A3) in which the additional area A3 is added to the grone sound generation area A1 is specified as the updated grone sound generation area A1'(dot pattern portion). As a result, in the updated grown sound generation region A1', the lower limit value of the hydraulic pressure corresponding to each vehicle speed becomes lower than the lower limit value in the grown sound generation region A1 before the update. The region outside the updated grown sound generation region A1'is used as the updated hydraulic pressure usage band A2', as will be described later. In the processing routine of FIG. 3, step S100 is executed by the grown sound determination unit 15, and steps S101 to S104 are executed by the map changing unit 16.

After rewriting the map 17 (step S104), the processing routine ends. At the time of brake control after rewriting the map 17, the actuator control unit 14 refers to the rewritten map 17 and sets the area outside the updated grown sound generation area A1'as the hydraulic pressure usage band A2'. The hydraulic pressure of the brake 11 is adjusted via the brake actuator 12. As described above, even if there is a change in the hydraulic band where the grown noise is generated due to changes over time or deterioration over time due to long-term use of parts and parts related to the brake, the hydraulic band used in Map 17 is updated according to the change. It is possible to prevent the generation of grown noise for a long time just by making it.

Additional Notes The following additional notes will be further disclosed with respect to the embodiments described above.

[Appendix 1]
One aspect of the vehicle noise suppressing device according to the present invention is a vehicle that suppresses the grown sound related to the hydraulic brake in a vehicle provided with a hydraulic brake and an actuator for adjusting the hydraulic pressure in the hydraulic brake in order to solve the above problems. It is a sound suppression device, and based on the detection means for detecting the grown sound and the detected grown sound, the usage band of the hydraulic pressure for each vehicle speed of the vehicle is changed so that the grown sound is reduced. It includes a band changing means and a control means for controlling the actuator so as to adjust the hydraulic pressure in the changed used band.

According to the vehicle abnormal noise suppressing device described in Appendix 1, the grown sound is detected by a detection means having, for example, a sound collecting microphone or an acceleration sensor while the vehicle is running or starting. The detection here may be to detect the presence / absence, the occurrence rate, and the frequency of occurrence of a grown sound having a volume or vibration equal to or higher than a predetermined threshold. Alternatively, the volume of the grone sound or the vibration itself may be detected, or the total amount of such the volume or vibration itself per unit time may be detected. Then, based on the grown sound detected in this way, the band of the brake hydraulic pressure used for each vehicle speed of the vehicle is changed by the band changing means so that the grown sound is reduced. The change is typically made by rewriting the map showing the band used for each vehicle speed, which is referred to when adjusting the hydraulic pressure of the actuator for each vehicle speed. Then, when the vehicle is running, starting or stopping after that, the actuator is controlled by the control means so as to adjust the hydraulic pressure in the changed use band at each vehicle speed. Therefore, even if there is a change in the hydraulic band where the grown noise is generated due to changes over time or deterioration over time in the parts and parts related to the brake, the hydraulic pressure is almost or practically followed completely in real time. The area of use in the brakes can also be changed. As a result, the generation of grown sound is efficiently reduced or suppressed.

[Appendix 2]
The vehicle noise suppression device according to Appendix 2 further includes a determination means for determining whether or not a grown sound is generated based on the grown sound detected by the detection means, and further comprises a band change. The means is the vehicle noise suppressing device according to Appendix 1, wherein the band used is changed when the determination means determines that the grown sound is generated.

According to the vehicle noise suppressing device described in Appendix 2, when the determination means determines that the grown sound is generated, the band changing means changes the band to be used. On the other hand, when it is determined that no grown sound is generated, the band changing means does not unnecessarily change the band used. At this time, the "predetermined standard" for determination is typically a threshold value corresponding to the generation rate of the grown sound at a level perceived by the driver or passenger as the grown sound, or the grown sound or vibration. It is a threshold value corresponding to the volume, the frequency of occurrence, the total value of the volume of the grown sound per unit time obtained by multiplying the two, or the occurrence rate of the grown sound. Such a predetermined threshold value may be set as a grown sound (further, by subtracting a slight margin) such as an occurrence rate of an upper limit level that is not detected by the driver or passengers experimentally, empirically, or by simulation. Further, such a predetermined threshold value may be appropriately changed by machine learning based on the magnitude and occurrence rate of the grown sound detected during the actual running of the vehicle or when the vehicle starts or stops. good. As a result, the generation of grown sound is reduced or suppressed extremely efficiently as needed.

[Appendix 3]
In the vehicle noise suppression device according to Appendix 3, the band changing means has the region where the grown is generated as a map having at least the hydraulic pressure and the vehicle speed as parameters, and the used band is changed by rewriting the map. The vehicle noise suppression device according to Supplementary Note 1, wherein the vehicle noise suppression device is characterized by the above.

According to the vehicle charging planning system described in Appendix 3, the band used by the actuator can be controlled by the control means at least with reference to a map with hydraulic pressure and vehicle speed as parameters, and this is particularly when a grown sound is generated. The band used can be easily changed by rewriting the map. As a result, the generation of grown sound is extremely efficiently reduced or suppressed.

The present invention can be appropriately modified within the scope of the claims and within the scope not contrary to the gist or idea of the invention which can be read from the entire specification, and the vehicle noise suppression device accompanied by such modification is also in the technical idea of the present invention. included.

Vehicle noise suppression device …… 10
Hydraulic brake …… 11
Brake actuator …… 12
Actuator control unit (control means) …… 14
Grown sound judgment unit (judgment means) …… 15
Map change part (band change part) …… 16
Map …… 17
Sensor (detection means) …… 18

Claims (1)

A vehicle abnormal noise suppressing device for suppressing a grown noise related to the hydraulic brake in a vehicle provided with a hydraulic brake and an actuator for adjusting the hydraulic pressure in the hydraulic brake.
The detection means for detecting the grown sound and
A band changing means for changing the hydraulic pressure usage band for each vehicle speed of the vehicle based on the detected grown sound so that the grown sound is reduced.
A vehicle noise suppression device comprising a control means for controlling the actuator so as to adjust the hydraulic pressure in the changed use band.

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