Brake dust measuring device, brake dust measuring method, and brake dust measuring program

Abstract

The present application provides a kind of brake dust measuring device, brake dust measuring method and brake dust measuring program. Even in the case of making main flow variation, in order to be able to measure brake dust amount etc. with high accuracy, brake dust measuring device (100) measures the brake dust generated from brake (Z), comprising: main flow channel (L2), for containing brake dust sample gas flows;Sampling flow channel (L3) is connected with the sampling point (X) set in main flow channel (L2), and part of sample gas is collected;And flow control mechanism, control as the flow of sampling flow channel (L3) sampling flow, so that sampling flow becomes the flow proportional to the main flow as the flow of main flow channel.

Description

Technical Field

[0001] This invention relates to a brake dust measuring device, a brake dust measuring method, and a brake dust measuring procedure. Background Technology

[0002] As a conventional brake dust measuring device, as shown in Patent Document 1, it includes a device that actuates a brake by blowing air onto it within a cavity, collects the brake dust generated during this process, and measures, for example, the amount of brake dust. Specifically, in this measuring device, a sampling channel for collecting a portion of the air is connected to the main flow channel for the air containing brake dust.

[0003] In the aforementioned measuring device, to accurately evaluate the amount of brake dust, it is preferable to keep the airflow velocity blowing onto the brake constant. To this end, the following approach can be considered: controlling the flow rate of the main flow channel (hereinafter referred to as the main flow rate) to keep the airflow velocity blowing onto the brake constant.

[0004] However, if the main flow rate is changed, the ratio of the sampling flow rate collected in the sampling channel to the main flow rate will change, making it impossible to accurately determine the amount of braking dust, etc.

[0005] Patent Document 1: Japanese Patent Publication No. 2020-520448 Summary of the Invention

[0006] Therefore, the main objective of this invention is to be able to measure the amount of brake dust and the like with higher accuracy than ever before.

[0007] That is, the brake dust measuring device of the present invention measures brake dust generated from the brake, comprising: a main flow channel for a sample gas containing the brake dust to flow; a sampling channel connected to a sampling point set in the main flow channel to collect a portion of the sample gas; and a flow control mechanism for controlling the sampling flow rate as the flow rate of the sampling channel, such that the sampling flow rate becomes a flow rate proportional to the main flow rate as the flow rate of the main flow channel.

[0008] The brake dust measuring device configured in this way can control the sampling flow rate so that it is proportional to the main flow rate. Therefore, even when the main flow rate changes, it can measure the amount of brake dust with high accuracy.

[0009] The main flow rate is preferably set using at least one of the temperature and pressure of the containment space housing the brake. In this way, the main flow rate can be set by using the temperature and / or pressure of the containment space and taking into account the flow rate of the air blown onto the brake. Thus, for example, the main flow rate can be controlled so that the air blown onto the brake reaches the desired flow rate, and the amount of brake dust can be evaluated more accurately.

[0010] To automate the setting of the main flow rate, it is preferable that the flow control mechanism controls the main flow rate based on at least one of the temperature and pressure of the containment space housing the brake.

[0011] To ensure a constant airflow velocity to the brake, the brake dust measuring device preferably includes a flow rate calculation unit that calculates the flow rate of the gas blowing onto the brake based on at least one of the temperature and pressure of the containment space housing the brake, and the flow control mechanism controls the main flow rate based on the calculated flow rate calculated by the flow rate calculation unit.

[0012] The preferred brake dust measuring device includes a main flow meter, which is located in the main flow channel at a position further downstream than the sampling point. In this way, compared with setting the main flow meter at a position further upstream than the sampling point, the dirt on the main flow meter caused by braking dust can be reduced, and there is no need to worry about braking dust adhering to the main flow meter and affecting the measurement results.

[0013] For example, in order to conduct a test simulating actual driving, the flow control mechanism preferably controls the main flow based on vehicle speed data representing vehicle speed.

[0014] As specific methods for controlling the main flow rate and the sampling flow rate, the following methods can be listed. The flow control mechanism includes: a main flow rate adjustment unit disposed in the main flow channel to adjust the flow rate of the sample gas introduced into the main flow channel; a sampling flow rate adjustment unit disposed in the sampling channel to adjust the flow rate of the sample gas introduced into the sampling channel; and a flow control unit that controls one or both of the main flow rate adjustment unit and the sampling flow rate adjustment unit to control the sampling flow rate as the flow rate of the sampling channel, so that the sampling flow rate becomes a flow rate proportional to the main flow rate as the flow rate of the main flow channel.

[0015] In order to evaluate the amount of brake dust, the brake dust measuring device preferably includes a brake dust calculation unit, which calculates the amount of brake dust in one test or the amount of brake dust per predetermined distance.

[0016] In order to easily measure the amount of brake dust, the brake dust measuring device preferably includes a collection section disposed in the sampling channel to collect the brake dust contained in the sample gas being collected.

[0017] Preferably, the downstream end of the sampling channel is connected between the sampling point in the main channel and the main flow meter, thereby enabling the sample gas collected in the sampling channel to return to the main channel. Thus, because the flow rate of the collected sample gas after it flows back to the main channel can be measured as the main flow rate, the sampling flow rate can be made proportional to the main flow rate with higher accuracy.

[0018] In addition, as another way to make the sampling flow rate proportional to the main flow rate with higher accuracy, the following can be listed: the brake dust measuring device also includes a sampling flow meter disposed in the sampling channel, and the flow control mechanism uses the sampling flow rate measured by the sampling flow meter to correct the main flow rate measured by the main flow meter.

[0019] As a specific structure for controlling the sampling flow rate, the following structure can be listed: the braking dust measuring device includes a sampling flow meter and a sampling pump installed in the sampling channel.

[0020] More specifically, the brake dust measuring device may also include a structure in which the brake generator is arranged.

[0021] Furthermore, the brake dust measurement method of the present invention measures brake dust generated from a brake, comprising the following steps: allowing a sample gas containing the brake dust to flow through a main flow channel; collecting a portion of the sample gas from a sampling channel connected to a sampling point set in the main flow channel; and controlling the sampling flow rate, which is the flow rate of the sampling channel, such that the sampling flow rate becomes a flow rate proportional to the main flow rate, which is the flow rate of the main flow channel.

[0022] Furthermore, the brake dust measurement program of the present invention is used in a brake dust measurement device for measuring brake dust generated from a brake, wherein the brake dust measurement device includes: a main flow channel for the flow of a sample gas containing the brake dust; and a sampling channel connected to a sampling point set in the main flow channel to collect a portion of the sample gas. The brake dust measurement program enables a computer to function as a flow control unit, which controls the sampling flow rate as the flow rate of the sampling channel, such that the sampling flow rate becomes a flow rate proportional to the main flow rate as the flow rate of the main flow channel.

[0023] By following this method and procedure for measuring brake dust, the same effect as the aforementioned brake dust measuring device can be achieved.

[0024] According to the present invention configured in this way, even when the main flow rate changes, the amount of brake dust and the like can be measured with high accuracy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the overall structure of a brake dust measuring device according to one embodiment of the present invention. Figure 2This is a functional block diagram illustrating the functions of a control device in the same implementation. Figure 3 This is a flowchart illustrating a braking dust measurement method according to the same embodiment. Figure 4 This is a functional block diagram illustrating the functions of the control device in other embodiments. Figure 5 This is a schematic diagram showing the overall structure of a brake dust measuring device according to other embodiments. Figure 6 This is a schematic diagram showing the overall structure of a brake dust measuring device according to other embodiments. Figure 7 This is a schematic diagram showing the overall structure of a brake dust measuring device according to other embodiments. Explanation of reference numerals in the attached figures

[0026] 100 Brake Dust Measuring Device 101 Flow Control Mechanism Z brake D Brake Generator 10 cavities 10S Containment Space L1 supply channel L2 Mainstream Road L3 Sampling Channel P1 Main Pump (Main Flow Adjustment Unit) P2 Sampling Pump (Sampling Flow Adjustment Unit) F trap filter 20 Control devices 21 Flow Control Department 22. Flow velocity calculation section 23. Size Information Storage Unit 24. Brake Dust Calculation Section FM1 Main Flow Meter FM2 sampling flow meter X sampling point TS Temperature Sensor PS pressure sensor. Detailed Implementation

[0027] The following describes one embodiment of the brake dust measuring device of the present invention with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the brake dust measuring device 100 of this embodiment is used to measure, for example, the amount of brake dust generated by actuating the brake Z, thereby testing the performance of the brake Z. Here, the brake Z is configured to be connected to the brake generator (dynamo) D for operation. Alternatively, the brake dust measuring device 100 can be a device that tests the performance of the brake Z of a test vehicle (which is a completed vehicle) by driving the test vehicle on a chassis dynamometer.

[0029] Specifically, such as Figure 1 As shown, the brake dust measuring device 100 includes: a cavity 10 that houses a brake Z, which is a test subject and is connected to a brake generator D; a supply channel L1 that supplies gas to the brake Z, which operates within the cavity 10; a main channel L2 that allows brake dust generated from the brake Z to flow together with the gas; and a sampling channel L3 that collects a portion of the sampling gas from the main channel L2.

[0030] The cavity 10 is, for example, cylindrical, and its internal space is formed as a receiving space 10s for accommodating the brake Z.

[0031] The supply channel L1 is connected to the inlet 10a provided in the cavity 10, through which air is supplied to the cavity 10, for example. The supplied air then blows onto the operating brake Z. Furthermore, the gas blown onto the brake Z is not limited to air and can be varied appropriately.

[0032] In the described embodiment, such as Figure 1 As shown, the inlet 10a is formed on the upper surface of the cavity 10, but the position of the inlet 10a is not limited to this and can be changed appropriately. Additionally, in the supply channel L1, as... Figure 1 As shown, one or more rectifiers Z1 for rectifying airflow can also be provided, for example, at the bend.

[0033] The main channel L2 is connected to the outlet 10b provided in the cavity 10, allowing the sample gas containing braking dust to flow out from the outlet 10b. Alternatively, the sample gas in this embodiment is air containing braking dust.

[0034] In the described embodiment, such as Figure 1 As shown, the outlet 10b is configured opposite to the inlet 10a. Specifically, the outlet 10b is formed on the bottom surface of the cavity 10. By configuring the inlet 10a and outlet 10b on the top and bottom of the cavity 10 in this way, brake dust generated from the brake Z can be prevented from remaining in the cavity 10 and can flow into the main flow channel L2, thus reducing, for example, the measurement error of the amount of brake dust. However, the position of the outlet 10b is not limited to this and can be changed appropriately. In addition, in the main flow channel L2, such as Figure 1 As shown, one or more rectifier plates Z2 for rectifying the sample gas can also be provided, for example, at the bend.

[0035] A main flow adjustment unit P1 is provided downstream of the main flow channel L2. The main flow adjustment unit P1 is used to adjust the flow rate of the sample gas introduced into the main flow channel L2 from the cavity 10. In this embodiment, the main flow adjustment unit P1 is a main pump provided for introducing sample gas into the main flow channel L2, but it can also be a blower or a mass flow controller provided independently of the main pump.

[0036] One end of the sampling channel L3 is connected to a pre-set sampling point X of the main channel L2, and a sampling pump P2 is installed at the other end, thereby introducing a portion of the sample gas from the main channel L2 into the sampling channel L3.

[0037] A sampling flow rate adjustment unit P2 is provided in the sampling channel L3. The sampling flow rate adjustment unit P2 is used to adjust the flow rate of the sample gas introduced into the sampling channel L3 from the main channel L2. The sampling flow rate adjustment unit P2 in the above embodiment is the sampling pump P2 provided to introduce the sample gas into the sampling channel L3, but it can also be a blower or a mass flow controller provided independently of the sampling pump P2.

[0038] Additionally, a collection filter F, serving as a collection unit, is installed in the sampling channel L3 to capture braking dust in the sample gas. However, a sampling bag may also be installed in the sampling channel L3 instead of the collection filter F, or a sampling bag may be installed based on the collection filter F. Furthermore, the trapping filter F is positioned upstream of the sampling pump P2 to reduce contamination of the sampling pump P2 due to braking dust. However, the trapping filter F can also be positioned downstream of the sampling pump P2.

[0039] Moreover, such as Figure 1 and Figure 2 As shown, the brake dust measuring device 100 of this embodiment includes a flow control mechanism 101, which controls the sampling flow rate as the flow rate of the sampling channel L3, so that the sampling flow rate becomes a flow rate proportional to the main flow rate as the flow rate of the main channel L2. That is, the brake dust measuring device 100 of this embodiment uses the flow control mechanism 101 to set the flow rate of the main flow channel L2 and the sampling flow rate as the flow rate of the sampling flow channel L3, so that the sampling flow rate becomes a flow rate proportional to the main flow rate as the flow rate of the main flow channel L2.

[0040] Specifically, the flow control mechanism 101 includes at least the main flow adjustment unit P1, the sampling flow adjustment unit P2, and the flow control unit 21 that controls the main flow adjustment unit P1 and the sampling flow adjustment unit P2.

[0041] More specifically, the brake dust measuring device 100 of this embodiment also includes a main flow meter FM1 installed in the main flow channel L2 and a sampling flow meter FM2 installed in the sampling flow channel L3. The flow control unit 21 controls the sampling flow adjustment unit P2 so that the sampling flow measured by the sampling flow meter FM2 becomes a flow rate proportional to the main flow measured by the main flow meter FM1.

[0042] In the described embodiment, the main flow meter FM1 is positioned downstream of sampling point X in the main flow channel L2, a configuration that reduces contamination caused by braking dust. Therefore, there is no concern that braking dust adhering to the main flow meter FM1 will affect the measurement results. However, the main flow meter FM1 can also be positioned upstream of sampling point X in the main flow channel L2. Furthermore, an ultrasonic flow meter can be cited as an example of the main flow meter FM1.

[0043] In the described embodiment, the sampling flow meter FM2 is positioned downstream of the trapping filter F in the sampling channel L3, specifically between the trapping filter F and the sampling pump P2. This configuration reduces contamination caused by braking dust. However, the sampling flow meter FM2 can also be positioned upstream of the trapping filter F in the sampling channel L3.

[0044] like Figure 1 and Figure 2 As shown, the flow control unit 21 is a function of the control device 20, which is a general-purpose or special-purpose computer equipped with a CPU, memory, etc. That is, the control device 20, by following a braking dust measurement program stored in a predetermined area of ​​the memory, coordinates the CPU and peripheral devices to at least perform the function of the flow control unit 21.

[0045] Specifically, the flow control unit 21 is configured to control the sampling flow adjustment unit P2 (e.g., the rotational speed of the sampling pump) so that the ratio of the sampling flow to the mainstream flow becomes a predetermined split ratio. Furthermore, the mainstream flow and the sampling flow here are mass flow rates.

[0046] like Figure 2 As shown, the control device 20 described above can also function as a flow rate calculation unit 22, which calculates the flow rate of the gas (here, air) blown onto the brake Z.

[0047] More specifically, such as Figure 1 As shown, the cavity 10 of this embodiment is provided with a temperature sensor TS for detecting the temperature inside the cavity 10. The temperature sensor TS is configured to detect the temperature around (near) the brake Z, and the detected temperature detected by the temperature sensor TS is output to the control device 20.

[0048] In addition, such as Figure 1 As shown, the cavity 10 of this embodiment is provided with a pressure sensor PS for detecting the pressure inside the cavity 10. The pressure sensor PS is configured to detect the pressure around (near) the brake Z, and the detected pressure detected by the pressure sensor PS is output to the control device 20.

[0049] Furthermore, the flow rate calculation unit 22 obtains the aforementioned detection temperature and detection pressure, and calculates the flow rate of the gas (here, air) blown onto the brake Z based on the detection temperature and detection pressure. More specifically, such as Figure 2 As shown, the control device 20 of this embodiment includes a size information storage unit 23 for storing size information of the cavity 10. The size information of the cavity 10 includes the cross-sectional area of ​​the cavity 10 or the radial dimension used to calculate the cross-sectional area, etc. The flow rate calculation unit 22 is configured to calculate the flow rate of the gas blown onto the brake Z based on the detected temperature, detected pressure and size information (e.g., the cross-sectional area of ​​the cavity 10).

[0050] In this configuration, the flow control unit 21 can also be configured to control the main flow based on at least one of the temperature and pressure of the containment space 10s of the containment brake Z. Specifically, the flow control unit 21 is configured to control the main flow rate using a calculated flow rate based on the detected temperature and / or detected pressure, and to control the main flow rate adjustment unit P1 (e.g., the rotational speed of the main pump) so that the calculated flow rate becomes a predetermined constant flow rate.

[0051] like Figure 2 As shown, the control device 20 may also function as a brake dust quantity calculation unit 24, which calculates the amount of brake dust.

[0052] The brake dust calculation unit 24 obtains the amount of brake dust captured by the aforementioned trapping filter F, and calculates the total amount of brake dust in one test or the amount of brake dust per predetermined distance. Furthermore, the amount of brake dust captured by the trapping filter F can be obtained, for example, by subtracting the weight of the trapping filter F before trapping from the weight of the trapping filter F after trapping.

[0053] As a more specific way of calculating the amount of brake dust, for example, the total amount of brake dust can be calculated by multiplying the amount of brake dust collected by the ratio of the main flow rate to the sampling flow rate.

[0054] In addition, as another method of the brake dust amount calculation unit 24, the following methods can be listed: obtain the rotational speed of the brake disc constituting the brake Z, calculate the travel distance from the rotational speed, thereby calculate the mass of brake dust per unit travel distance, and output the mass to a display or the like.

[0055] Next, refer to Figure 3 The process is described to illustrate the brake dust measurement method of the brake dust measuring device 100 in this embodiment.

[0056] First, while the brake Z is actuated within the cavity 10, air is supplied to the brake Z from the supply channel L1. By operating the main pump, which serves as the main flow adjustment unit P1, the sample gas containing brake dust generated from the brake Z flows into the main flow channel L2 (S1).

[0057] Then, a portion (S2) of the sample gas flowing through the main flow channel L2 is collected in the sampling channel L3. As a result, the brake dust contained in the sample gas is captured by the capture filter F.

[0058] At this time, the flow control unit 21 compares the main flow rate with the sampled flow rate and performs feedback control on the sampling pump, such as the speed, which is the sampling flow rate adjustment unit P2, to control the sampling flow rate so that the sampling flow rate becomes a flow rate proportional to the main flow rate (S3). In addition, in this embodiment, as described above, the flow control unit 21 controls the main flow by performing feedback control on the main pump, such as the rotational speed, which is the main flow adjustment unit P1, so that the calculated flow rate calculated by the flow rate calculation unit 22 becomes a predetermined constant flow rate.

[0059] Then, in this embodiment, the brake dust calculation unit 24 calculates, for example, the total mass of brake dust in one test, the mass of brake dust per unit travel distance, etc., and outputs it to a display or the like (S4).

[0060] The brake dust measuring device 100 configured in this way can measure the amount of brake dust with high accuracy even when the main flow rate is changed, because the sampling flow rate is controlled to be proportional to the main flow rate.

[0061] In addition, since the flow control unit 21 controls the main flow to make the calculated flow rate a predetermined constant flow rate, the flow rate of the air blown onto the brake Z can be kept constant, and the amount of brake dust can be evaluated more accurately.

[0062] Furthermore, because brake dust is captured by the trapping filter F, the amount of brake dust can be measured more easily compared to, for example, using a sampling bag. Additionally, by guiding the sampled gas, either before or after passing through the trapping filter F, to a gas analysis device, the composition of the gas generated from the brake can also be measured.

[0063] Furthermore, the present invention is not limited to the embodiments described herein.

[0064] For example, such as Figure 4As shown, the control device 20 also includes a vehicle speed data receiving unit 25 that receives vehicle speed data representing vehicle speed, and the flow control unit 21 can also be configured to control the main flow based on the vehicle speed data received by the vehicle speed data receiving unit 25. Furthermore, vehicle speed data can include, for example, time-series data of vehicle speeds following a preset driving mode, or time-series data of vehicle speeds obtained through actual driving. In this way, the airflow speed blowing onto brake Z can be controlled to correspond to, for example, the actual driving speed of the vehicle, thereby enabling a test that simulates actual driving.

[0065] As the brake dust measuring device 100 of the present invention, such as Figure 5 As shown, it can also be configured such that the downstream end of the sampling channel L3 is connected between the sampling point X in the main channel L2 and the main flow meter FM1, so that the sample gas collected in the sampling channel L3 returns to the main channel L2. Thus, because the flow rate of the sampled gas after returning to the main flow channel L2 can be measured as the main flow rate, the sampling flow rate can be made proportional to the main flow rate with higher accuracy.

[0066] As another way to make the sampled flow rate proportional to the main flow rate with higher accuracy, the following method can be listed: the flow control mechanism 101 uses the sampled flow rate measured by the sampled flow meter FM2 to correct the main flow rate measured by the main flow meter FM1. Specifically, the flow control unit 21 may also be configured to add the main flow measured by the main flow meter FM1 to the sampled flow measured by the sampled flow meter FM2, and control one or both of the main flow adjustment unit P1 and the sampled flow adjustment unit P2 based on the added flow.

[0067] In addition, the size information storage unit 23 does not need to be set in the memory of the control device 20, but can also be set in external memory, cloud server, etc.

[0068] Furthermore, the flow control unit 21 in the above embodiment controls the main flow rate based on the calculated flow rate, but the flow control unit 21 may also control the main flow rate based on one or both of the detected temperature and detected pressure without using the calculated flow rate.

[0069] Furthermore, the main flow rate does not necessarily have to be controlled based on the calculated flow rate, detection temperature, or detection pressure. For example, the main flow rate can also be preset using at least one of the calculated flow rate, detection temperature, and detection pressure obtained before the measurement, and remain unchanged (controlled) during subsequent measurements.

[0070] In the embodiment described, the flow control unit 21 controls both the main flow adjustment unit P1 and the sampling flow adjustment unit P2. However, it may also control only one of the main flow adjustment unit P1 and the sampling flow adjustment unit P2, so that the sampling flow becomes a flow that is proportional to the main flow, which is the main flow channel.

[0071] Furthermore, the functions of the flow rate calculation unit 22 and the braking dust quantity calculation unit 24 do not necessarily have to be equipped in the same device as the flow control unit 21; they can also be equipped in other devices.

[0072] In addition, the brake dust measuring device 100 may also have the function of a flow rate output unit, which outputs the calculated flow rate calculated by the flow rate calculation unit 22 to a display or the like.

[0073] Furthermore, in the described embodiment, the amount of brake dust captured by the trapping filter F is calculated. However, instead of the trapping filter F, or based on the trapping filter F, a DCS (Diffusion Changer Sensor) can be installed in the sampling channel L3. The DCS functions as both a dust collection and analysis unit, for example, simultaneously collecting and analyzing brake dust. Similarly, instead of the trapping filter F, or based on the trapping filter F, a PN (Particle Number) measuring instrument can be installed in the sampling channel L3, allowing the PN measuring instrument to function as both a dust collection and analysis unit. Alternatively, the concept of including at least one of the following: a capture filter F, a brake dust quantity calculation unit, an exhaust gas analysis device, a DCS, and a PN measuring instrument can also be referred to as a brake dust analysis unit.

[0074] Alternatively, the brake dust measuring device 100 may also be equipped with a sampling bag for collecting sample gas, and the various components contained in the collected sample gas may be measured. Furthermore, components such as hydrocarbons derived from brake dust and / or components contained in exhaust gas can be listed as components to be measured. In this case, the sampling bag SB can be positioned, for example, downstream of the sampling flow rate adjustment unit P2, or as follows: Figure 6 As shown, a second sampling channel L4 is set up, different from the sampling channel L3. Additionally, in Figure 6 In the structure shown, a sampling pump P3 serving as a second sampling flow rate adjustment unit and a second sampling flow meter FM3 can also be provided in the second sampling channel L4. Furthermore, the sampling point of the second sampling channel L4 can be upstream of or downstream of the sampling point X of the sampling channel L3. With the structure of such a sampling bag SB, the measurement of sample gas collected in the sampling bag and the measurement of braking dust can be performed simultaneously, or the measurement of sample gas collected in the sampling bag and the measurement of braking dust can be performed independently.

[0075] The brake dust measuring device 100 of the present invention can be configured as follows: Figure 7 As shown, air flows laterally (or approximately horizontally) within the cavity 10, and although not shown, it can also be configured to flow in an inclined direction within the cavity 10, which is inclined relative to the lateral or vertical directions, respectively. Specific implementations include providing an air inlet 10a and an air outlet 10b on the side circumferential surface of the cavity 10. Furthermore, the inlet 10a and the air outlet 10b can be configured opposite to each other or not.

[0076] Furthermore, the present invention is not limited to the described embodiments, and various modifications can be made without departing from the spirit of the present invention. Industrial applicability

[0077] According to the present invention, the amount of brake dust and other components can be measured with higher accuracy than before.

Claims

1. A brake dust measuring device for measuring brake dust generated from a brake, characterized in that, include: The main channel provides a flow path for the sample gas containing the brake dust; A sampling channel is connected to a sampling point set in the main channel to collect a portion of the sample gas; A flow control mechanism controls the sampling flow rate, which is the flow rate of the sampling channel, so that the sampling flow rate becomes a flow rate proportional to the main flow rate, which is the flow rate of the main channel. as well as The main flow meter is located in the main flow channel at a position further downstream than the sampling point. The downstream end of the sampling channel is connected between the sampling point in the main channel and the main flow meter, thereby enabling the sample gas collected in the sampling channel to return to the main channel.

2. The brake dust measuring device according to claim 1, characterized in that, The main flow rate is set using at least one of the temperature and pressure of the containment space housing the brake.

3. The brake dust measuring device according to claim 2, characterized in that, The flow control mechanism controls the main flow based on at least one of the temperature and pressure of the containment space.

4. The brake dust measuring device according to claim 3, characterized in that, It also includes a flow rate calculation unit, which calculates the flow rate of the gas blown onto the brake based on at least one of the temperature and pressure of the housing space housing the brake. The flow control mechanism controls the main flow rate based on the calculated flow rate derived by the flow rate calculation unit.

5. The brake dust measuring device according to any one of claims 1 to 4, characterized in that, The flow control mechanism controls the main flow based on vehicle speed data representing vehicle speed.

6. The brake dust measuring device according to any one of claims 1 to 5, characterized in that, The flow control mechanism has: A main flow adjustment unit is provided in the main flow channel to adjust the flow rate of the sample gas introduced into the main flow channel; A sampling flow rate adjustment unit is provided in the sampling channel to adjust the flow rate of the sample gas introduced into the sampling channel; as well as The flow control unit controls the sampling flow rate, which is the flow rate of the sampling channel, by controlling one or both of the main flow adjustment unit and the sampling flow adjustment unit, so that the sampling flow rate becomes a flow rate proportional to the main flow rate, which is the flow rate of the main channel.

7. The brake dust measuring device according to any one of claims 1 to 6, characterized in that, It also includes a brake dust calculation unit, which calculates the brake dust amount for one test or the brake dust amount per predetermined distance.

8. The brake dust measuring device according to any one of claims 1 to 7, characterized in that, It also includes a collection section, which is disposed in the sampling channel to collect the brake dust contained in the sample gas being collected.

9. The brake dust measuring device according to claim 1, characterized in that, It also includes a sampling flow meter installed in the sampling channel. The flow control mechanism uses the sampled flow rate measured by the sampled flow meter to correct the main flow rate measured by the main flow meter.

10. The brake dust measuring device according to any one of claims 1 to 9, characterized in that, It also includes a brake generator in which the brake is arranged.

11. A method for measuring brake dust, characterized in that, Includes the following steps: The sample gas containing the brake dust is allowed to flow through the main channel; A portion of the sample gas is collected from a sampling channel connected to a sampling point located in the main channel; The sampling flow rate, which serves as the flow rate of the sampling channel, is controlled such that the sampling flow rate becomes a flow rate proportional to the main flow rate, which serves as the flow rate of the main channel. as well as The sample gas collected in the sampling channel is returned from the downstream end of the sampling channel to the sampling point in the main channel and the main flow meter located further downstream than the sampling point.

12. A computer-readable storage medium storing a program for measuring brake dust, the program being used in a brake dust measuring apparatus for measuring brake dust generated from a brake, characterized in that, The brake dust measuring device includes: a main flow channel for the flow of sample gas containing the brake dust; a sampling channel connected to a sampling point located in the main flow channel for collecting a portion of the sample gas; and a main flow meter located in the main flow channel downstream of the sampling point, wherein the downstream end of the sampling channel is connected between the sampling point in the main flow channel and the main flow meter, configured to return the sample gas collected in the sampling channel to the main flow channel. The braking dust measurement program enables the computer to function as a flow control unit, which controls the sampling flow rate of the sampling channel, so that the sampling flow rate becomes a flow rate proportional to the main flow rate of the main channel.

13. A brake dust measuring device for measuring brake dust generated from a brake, characterized in that, include: The main channel provides a flow path for the sample gas containing the brake dust; A sampling channel is connected to a sampling point set in the main channel to collect a portion of the sample gas; as well as A flow control mechanism controls the sampling flow rate, which serves as the sampling channel, so that the sampling flow rate becomes a flow rate proportional to the main flow rate, which serves as the main channel. The flow control mechanism controls the main flow based on vehicle speed data representing vehicle speed.

14. A brake dust measuring device for measuring brake dust generated from a brake, characterized in that, include: The main channel provides a flow path for the sample gas containing the brake dust; A sampling channel is connected to a sampling point set in the main channel to collect a portion of the sample gas; A flow control mechanism controls the sampling flow rate, which is the flow rate of the sampling channel, so that the sampling flow rate becomes a flow rate proportional to the main flow rate, which is the flow rate of the main channel. The main flow meter is located in the main flow channel at a position further downstream than the sampling point; as well as A sampling flow meter is installed in the sampling flow channel. The flow control mechanism uses the sampled flow rate measured by the sampled flow meter to correct the main flow rate measured by the main flow meter.

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