WO2022130853A1 - ブレーキダスト測定装置、ブレーキダスト測定方法、及びブレーキダスト測定用プログラム - Google Patents
ブレーキダスト測定装置、ブレーキダスト測定方法、及びブレーキダスト測定用プログラム Download PDFInfo
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- WO2022130853A1 WO2022130853A1 PCT/JP2021/041716 JP2021041716W WO2022130853A1 WO 2022130853 A1 WO2022130853 A1 WO 2022130853A1 JP 2021041716 W JP2021041716 W JP 2021041716W WO 2022130853 A1 WO2022130853 A1 WO 2022130853A1
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- flow rate
- sampling
- brake dust
- flow path
- brake
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- 239000000428 dust Substances 0.000 title claims abstract description 137
- 238000000691 measurement method Methods 0.000 title claims description 3
- 238000005259 measurement Methods 0.000 title abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 159
- 230000004308 accommodation Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000006870 function Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2208—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with impactors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0031—Devices for retaining friction material debris, e.g. dust collectors or filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
Definitions
- the present invention relates to a brake dust measuring device, a brake dust measuring method, and a brake dust measuring program.
- Patent Document 1 As a conventional brake dust measuring device, as shown in Patent Document 1, the brake is operated while applying air to the brake set in the chamber, and the brake dust generated at this time is collected and, for example, the amount thereof is measured. There is something to measure. Specifically, in this measuring device, a sampling flow path for collecting a part of the air is connected to the main flow path through which the air containing the brake dust flows.
- the flow velocity of the air applied to the brake it is preferable to keep the flow velocity of the air applied to the brake constant.
- the main flow rate it is conceivable to control the flow rate of the main flow path (hereinafter referred to as the main flow rate) so that the flow velocity of the air hitting the brake becomes constant.
- the main subject of the present invention is to be able to measure the amount of brake dust and the like with higher accuracy than before.
- the brake dust measuring device is a brake dust measuring device that measures the brake dust generated from the brake, and is set in the main flow path through which the sample gas containing the brake dust flows and the main flow path.
- the sampling flow rate which is the flow rate of the sampling flow path, is connected to the sampling point and is proportional to the main flow rate, which is the flow rate of the main flow path, and the sampling flow rate, which is connected to the sampling point and collects a part of the sample gas. It is characterized by having a flow rate control mechanism for controlling the above.
- the sampling flow rate is controlled so that the flow rate is proportional to the main flow rate, so even if the main flow rate is changed, the amount of brake dust and the like can be measured accurately. Is possible.
- the main flow rate is set using at least one of the temperature and pressure of the accommodation space in which the brake is accommodated.
- the main flow rate can be set in consideration of the flow velocity of the air or the like that hits the brake using the temperature and pressure of the accommodation space.
- the main flow rate can be controlled so that the air or the like hitting the brake has a desired flow rate, and the amount of brake dust or the like can be evaluated more accurately.
- the flow rate control mechanism controls the main flow rate based on at least one of the temperature and the pressure of the accommodation space in which the brake is accommodated.
- a flow velocity calculation unit for calculating the flow velocity of the gas hitting the brake based on at least one of the temperature and the pressure of the accommodation space in which the brake is housed is further provided, and the flow rate control is performed. It is preferable that the mechanism controls the main flow rate based on the calculated flow velocity calculated by the flow velocity calculation unit.
- the flow rate control mechanism controls the main flow rate based on vehicle speed data indicating the vehicle speed.
- the flow rate control mechanism is provided in the main flow rate to adjust the flow rate of the sample gas drawn into the main flow rate.
- a mode having a flow rate control unit that controls the sampling flow rate, which is the flow rate of the sampling flow path, so that the flow rate is proportional to the main flow rate, which is the flow rate of the main flow path, can be mentioned. can.
- a brake dust amount calculation unit that calculates the amount of brake dust in one test or the amount of brake dust per predetermined distance.
- a collecting portion provided in the sampling flow path to collect the brake dust contained in the collected sample gas.
- the downstream end mechanism of the sampling flow path is connected between the sampling point in the main flow path and the main flow meter, and the sample gas collected in the sampling flow path is returned to the main flow path. It is preferable that it is configured as such. In this case, since the flow rate after the collected sample gas is returned to the main flow path can be measured as the main flow rate, the sampling flow rate can be more accurately set to the flow rate proportional to the main flow rate.
- a sampling flow meter provided in the sampling flow rate is further provided, and the flow control mechanism is a main measured by the main flow meter.
- An embodiment in which the flow rate is corrected by the sampling flow rate measured by the sampling flow meter can be mentioned.
- a configuration including a sampling flow meter and a sampling pump provided in the sampling flow path can be mentioned.
- the brake dust measuring method is a brake dust measuring method for measuring brake dust generated from a brake, in which a step of flowing a sample gas containing the brake dust in the main flow path and a step in the main flow path.
- the step of collecting a part of the sample gas from the sampling flow path connected to the set sampling point and the flow rate of the sampling flow path are proportional to the main flow rate, which is the flow rate of the main flow rate.
- the method is characterized by comprising a step of controlling a sampling flow rate, which is a flow rate.
- the brake dust measuring program according to the present invention is used for a brake dust measuring device for measuring brake dust generated from a brake, and the brake dust measuring device flows a sample gas containing the brake dust.
- the main flow rate which is the flow rate of the main flow path.
- the computer exerts a function as a flow rate control unit that controls a sampling flow rate, which is a flow rate of the sampling flow path, so that the flow rate becomes proportional.
- the present invention configured in this way, even if the main flow rate is fluctuated, the amount of brake dust and the like can be measured with high accuracy.
- the schematic diagram which shows the whole structure of the brake dust measuring apparatus which concerns on one Embodiment of this invention.
- the functional block diagram which shows the function of the control device of the same embodiment.
- the flowchart which shows the brake dust measurement method of the same embodiment.
- the functional block diagram which shows the function of the control device of another embodiment.
- the schematic diagram which shows the whole structure of the brake dust measuring apparatus of another embodiment.
- the schematic diagram which shows the whole structure of the brake dust measuring apparatus of another embodiment.
- the schematic diagram which shows the whole structure of the brake dust measuring apparatus of another embodiment. which shows the whole structure of the brake dust measuring apparatus of another embodiment.
- the brake dust measuring device 100 is for measuring, for example, the amount of brake dust generated by operating the brake Z and testing the performance of the brake Z.
- the brake Z alone is configured to operate by connecting it to the brake dynamo D.
- the brake dust measuring device 100 may be for running a test vehicle, which is a completed vehicle, on a chassis dynamometer to test the performance of the brake Z of the test vehicle.
- the brake dust measuring device 100 supplies gas to the chamber 10 accommodating the brake Z as a specimen connected to the brake dynamo D and the brake Z operating in the chamber 10. It includes a supply flow path L1, a main flow path L2 through which brake dust generated from the brake Z flows together with the gas, and a sampling flow path L3 for collecting a part of sampling gas from the main flow path L2.
- the chamber 10 has an internal space formed as an accommodation space 10s for accommodating the brake Z, and is, for example, a cylindrical one.
- the supply flow path L1 is connected to an introduction port 10a provided in the chamber 10, and for example, air is supplied into the chamber 10 through the introduction port 10a. As a result, the supplied air hits the operating brake Z.
- the gas applied to the brake Z is not necessarily limited to air, and may be changed as appropriate.
- the introduction port 10a is formed on the upper surface of the chamber 10, but the position of the introduction port 10a is not limited to this and may be appropriately changed. Further, as shown in FIG. 1, the supply flow path L1 may be provided with one or a plurality of rectifying plates Z1 for rectifying air, for example, at a curved portion.
- the main flow path L2 is connected to the outlet 10b provided in the chamber 10, and the sample gas containing the brake dust derived from the outlet 10b flows.
- the sample gas of this embodiment is air containing brake dust.
- the outlet port 10b is arranged to face the introduction port 10a, and is specifically formed on the bottom surface of the chamber 10.
- the brake dust generated from the brake Z can flow into the main flow path L2 without leaving in the chamber 10, for example, the brake. It is possible to reduce the measurement error of the dust amount.
- the position of the outlet 10b is not limited to this and may be changed as appropriate.
- the main flow path L2 may be provided with one or a plurality of straightening vanes Z2 for rectifying the sample gas, for example, at a curved portion.
- a main flow rate adjusting unit P1 for adjusting the flow rate of the sample gas drawn from the chamber 10 into the main flow path L2 is provided downstream of the main flow path L2.
- the main flow rate adjusting unit P1 in this embodiment is a main pump provided for drawing sample gas into the main flow path L2, but may be a blower or a mass flow controller provided separately from the main pump. ..
- sampling flow path L3 One end of the sampling flow path L3 is connected to a preset sampling point X of the main flow path L2, and a sampling pump P2 is provided at the other end of the sampling flow path L2, whereby a part of the sample gas is main flowed. It is drawn from the path L2 into the sampling flow path L3.
- the sampling flow path L3 is provided with a sampling flow rate adjusting unit P2 for adjusting the flow rate of the sample gas drawn from the main flow path L2 into the sampling flow path L3.
- the sampling flow rate adjusting unit P2 in this embodiment is the above-mentioned sampling pump P2 provided for drawing the sample gas into the sampling flow path L3, but is a blower or a mass flow controller provided separately from the sampling pump P2. May be there.
- the sampling flow path L3 is provided with a collection filter F, which is a collection unit for collecting brake dust in the sample gas.
- the sampling flow path L3 may be provided with a sampling bag instead of the collection filter F or in addition to the collection filter F.
- the collection filter F here is arranged on the upstream side of the sampling pump P2 described above, so that the contamination of the sampling pump P2 due to brake dust can be reduced.
- the collection filter F may be arranged on the downstream side of the sampling pump P2.
- the brake dust measuring device 100 of the present embodiment has a flow rate of the sampling flow path L3 so as to have a flow rate proportional to the main flow rate, which is the flow rate of the main flow path L2.
- a flow rate control mechanism 101 for controlling the sampling flow rate is provided. That is, in the brake dust measuring device 100 of the present embodiment, the flow rate of the main flow path L2 and the sampling flow rate L3 are set so that the flow rate is proportional to the main flow rate, which is the flow rate of the main flow rate L2, by the flow rate control mechanism 101.
- the sampling flow rate which is the flow rate of, is set.
- this flow rate control mechanism 101 includes at least the above-mentioned main flow rate adjustment unit P1, the sampling flow rate adjustment unit P2, and the flow rate control unit 21 that controls these main flow rate adjustment units P1 and the sampling flow rate adjustment unit P2. I have.
- the brake dust measuring device 100 of the present embodiment further includes a main flow meter FM1 provided in the main flow path L2 and a sampling flow meter FM2 provided in the sampling flow path L3.
- the flow rate control unit 21 controls the sampling flow rate adjusting unit P2 so that the sampling flow rate measured by the sampling flow meter FM2 is proportional to the main flow rate measured by the main flow meter FM1.
- the main flow meter FM1 is provided on the downstream side of the sampling point X in the main flow path L2, and this arrangement reduces dirt due to brake dust. As a result, there is no concern about the influence on the measurement result due to the adhesion of brake dust to the main flow meter FM1.
- the main flow meter FM1 may be provided on the upstream side of the sampling point X in the main flow path L2.
- the main flow meter FM1 for example, an ultrasonic flow meter and the like can be mentioned.
- the sampling flow meter FM2 is on the downstream side of the collection filter F in the sampling flow path L3, and specifically, is provided between the collection filter F and the sampling pump P2. We are trying to reduce dirt caused by brake dust. However, the sampling flow meter FM2 may be provided on the upstream side of the collection filter F in the sampling flow path L3.
- the flow rate control unit 21 is a function provided in the control device 20 which is a general-purpose or dedicated computer equipped with a CPU, a memory, and the like. That is, the control device 20 exerts at least a function as a flow rate control unit 21 by coordinating the CPU and peripheral devices according to the brake dust measurement program stored in the predetermined area of the memory.
- the flow rate control unit 21 is configured to control the sampling flow rate adjusting unit P2 (for example, the rotation speed of the sampling pump) so that the ratio of the sampling flow rate to the main flow rate becomes a predetermined diversion ratio. ..
- the main flow rate and the sampling flow rate here are mass flow rates.
- control device 20 may have a function as a flow velocity calculation unit 22 for calculating the flow velocity of the gas (here, air) that hits the brake Z.
- gas here, air
- the chamber 10 of the present embodiment is provided with a temperature sensor TS that detects the temperature inside the chamber 10.
- the temperature sensor TS is arranged to detect the temperature around (near) the brake Z, and is configured to output the detected temperature detected by the temperature sensor TS to the control device 20.
- the chamber 10 of the present embodiment is provided with a pressure sensor PS for detecting the pressure in the chamber 10.
- the pressure sensor PS is arranged to detect the pressure around (near) the brake Z, and is configured to output the detected pressure detected by the pressure sensor PS to the control device 20.
- the flow velocity calculation unit 22 acquires the above-mentioned detection temperature and detection pressure, and calculates the flow velocity of the gas (here, air) that hits the brake Z based on these. More specifically, as shown in FIG. 2, the control device 20 of the present embodiment is a size information storage unit that stores size information of the chamber 10, such as a cross-sectional area of the chamber 10 or a diameter dimension for calculating the cross-sectional area. 23 is provided, and the flow velocity calculation unit 22 is configured to calculate the flow velocity of the gas hitting the brake Z based on the detected temperature, the detected pressure, and the size information (for example, the cross-sectional area of the chamber 10).
- the flow rate control unit 21 may be configured to control the main flow rate based on at least one of the temperature and the pressure of the accommodation space 10s in which the brake Z is accommodated. Specifically, the flow rate control unit 21 is configured to control the main flow rate by using the calculated flow rate calculated based on the detected temperature and the detected pressure, so that the calculated flow rate becomes a predetermined constant flow rate. , Controls the main flow rate adjusting unit P1 (for example, the rotation speed of the main pump).
- control device 20 may further have a function as a brake dust amount calculation unit 24 for calculating the brake dust amount.
- the brake dust amount calculation unit 24 acquires the amount of brake dust collected by the above-mentioned collection filter F, and calculates the total amount of brake dust in one test or the amount of brake dust per predetermined distance. Is.
- the amount of brake dust collected by the collection filter F can be obtained, for example, by subtracting the weight of the collection filter F before collection from the weight of the collection filter F after collection.
- the brake dust amount calculation unit 24 for example, there is an embodiment in which the total amount of brake dust is calculated by multiplying the collected brake dust amount by the diversion ratio between the main flow rate and the sampling flow rate. Can be done.
- the brake dust amount calculation unit 24 for example, by acquiring the rotation speed of the brake disc constituting the brake Z and calculating the mileage from the rotation speed, the brake dust per unit mileage can be obtained.
- An embodiment in which the mass is calculated and the mass is output to a display or the like can be mentioned.
- the flow rate control unit 21 compares the main flow rate and the sampling flow rate, and feedback-controls, for example, the rotation speed of the sampling pump, which is the sampling flow rate adjusting unit P2, so that the sampling flow rate is proportional to the main flow rate. And control the sampling flow rate (S3).
- the flow rate control unit 21 has, for example, the rotation speed of the main pump, which is the main flow rate adjusting unit P1, so that the calculated flow velocity calculated by the flow velocity calculation unit 22 becomes a predetermined constant flow rate.
- the main flow rate is controlled by feedback control.
- the brake dust amount calculation unit 24 calculates, for example, the total mass of the brake dust in one test, the mass of the brake dust per unit mileage, and the like, and outputs the result to the display or the like (S4). ..
- the sampling flow rate is controlled so that the flow rate is proportional to the main flow rate, so that the amount of brake dust and the like can be accurately measured even when the main flow rate is changed. Is possible.
- the flow rate control unit 21 controls the main flow rate so that the calculated flow velocity becomes a predetermined constant flow rate, the flow velocity of the air or the like hitting the brake Z can be kept constant, and the amount of brake dust and the like can be evaluated more accurately. It becomes possible.
- the amount of brake dust can be easily measured as compared with the case of using a sampling bag, for example. It is also possible to measure the gas component generated from the brake by guiding the sampling gas that has passed through or before passing through the collection filter F to the gas analyzer.
- the present invention is not limited to the above embodiment.
- the control device 20 further includes a vehicle speed data receiving unit 25 that receives vehicle speed data indicating the vehicle speed, and the flow rate control unit 21 is based on the vehicle speed data received by the vehicle speed data receiving unit 25. It may be configured to control the main flow rate.
- vehicle speed data for example, time-series data of the vehicle speed according to a preset driving pattern, time-series data of the vehicle speed obtained by actual driving, and the like can be mentioned.
- the flow velocity of the air applied to the brake Z can be controlled according to, for example, the vehicle speed of the actual traveling, and a test simulating the actual traveling can be performed.
- the downstream end of the sampling flow path L3 is connected between the sampling point X in the main flow path L2 and the main flow meter FM1.
- the sample gas collected in the sampling flow path L3 may be returned to the main flow path L2.
- the sampling flow rate can be more accurately set to the flow rate proportional to the main flow rate.
- the flow control mechanism 101 corrects the main flow rate measured by the main flow meter FM1 by the sampling flow rate measured by the sampling flow meter FM2.
- the flow rate control unit 21 adds the sampling flow rate measured by the sampling flow meter FM2 to the main flow rate measured by the main flow meter FM1, and the main flow rate adjusting unit is based on the flow rate after the addition. It may be configured to control one or both of P1 and the sampling flow rate adjusting unit P2.
- the size information storage unit 23 does not need to be set in the memory of the control device 20, and may be set in an external memory, a cloud server, or the like.
- the flow rate control unit 21 of the above embodiment controls the main flow rate based on the calculated calculated flow velocity, but the flow rate control unit 21 does not use the calculated flow velocity and either the detected temperature or the detected pressure. Alternatively, the main flow rate may be controlled based on both.
- the main flow rate does not necessarily have to be controlled based on the calculated flow rate, detected temperature, or detected pressure, eg, using at least one of the calculated flow rate, detected temperature, or detected pressure obtained prior to the measurement. It may be set in advance and may not be changed (controlled) at the time of subsequent measurement.
- the flow rate control unit 21 controls both the main flow rate adjusting unit P1 and the sampling flow rate adjusting unit P2, but the sampling flow rate is proportional to the main flow rate, which is the flow rate of the main flow rate. As described above, one of the main flow rate adjusting unit P1 and the sampling flow rate adjusting unit P2 may be controlled.
- the functions of the flow velocity calculation unit 22 and the brake dust amount calculation unit 24 do not necessarily have to be provided in the same device as the flow rate control unit 21, but may be provided in another device.
- the brake dust measuring device 100 may have a function as a flow velocity output unit that outputs the calculated flow velocity calculated by the flow velocity calculation unit 22 to a display or the like.
- the amount of brake dust collected by the collection filter F was calculated, but instead of the collection filter F or in addition to the collection filter F, the dust collection unit and analysis A DCS (Diffusion Changer Sensor) that functions as a unit may be installed in the sampling flow path L3 so that the collection and analysis of brake dust can be performed at the same time, for example.
- a DCS diffusion Changer Sensor
- a PN (Particle Number) measuring instrument is provided in the sampling flow path L3 so as to exert a function as a dust collection unit and an analysis unit. Is also good.
- the concept including at least one of the collection filter F, the brake dust amount calculation unit, the exhaust gas analyzer, the DCS, and the PN measuring instrument may be referred to as a brake dust analysis unit.
- the brake dust measuring device 100 may be provided with a sampling bag for collecting the sample gas and may measure various components contained in the collected sample gas.
- the component to be measured include a component such as hydrocarbon derived from brake dust and / or a component contained in the exhaust gas.
- the sampling bag SB may be provided, for example, on the downstream side of the sampling flow rate adjusting unit P2, or as shown in FIG. 6, it is provided in a second sampling flow path L4 separate from the sampling flow path L3. May be.
- the second sampling flow path L4 may be provided with a sampling pump P3 as a second sampling flow rate adjusting unit and a second sampling flow meter FM3.
- the sampling point of the second sampling flow path L4 may be upstream or downstream of the sampling point X of the sampling flow path L3.
- the measurement of the sample gas collected in the sampling bag and the measurement of the brake dust may be performed at the same time or separately.
- the brake dust measuring device 100 may be configured to allow air to flow laterally (or substantially horizontally) in the chamber 10, and is shown in the figure.
- the air may be configured to flow in the chamber 10 in an oblique direction inclined with respect to each of the horizontal direction and the vertical direction.
- an air inlet port 10a and an air outlet port 10b are provided on the side peripheral surface of the chamber 10 can be mentioned.
- the introduction port 10a and the outlet port 10b may be arranged so as to face each other, or may be arranged so as to face each other.
- the amount of brake dust and the like can be measured more accurately than before.
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Abstract
Description
これならば、収容空間の温度や圧力を用いてブレーキに当たる空気等の流速を考慮して、メイン流量を設定することができる。これにより、例えば、ブレーキに当たる空気等が所望の流速になるように、メイン流量を制御することができ、ブレーキダスト量などをより正しく評価することが可能となる。
これならば、メイン流量計をサンプリングポイントよりも上流側に設ける場合よりも、ブレーキダストによるメイン流量計の汚れを低減することができ、さらにはメイン流量計にブレーキダストが付着することによる計測結果への影響の懸念もない。
これならば、採取したサンプルガスがメイン流路に戻された後の流量をメイン流量として計測することができるので、より精度良くサンプリング流量をメイン流量に比例した流量とすることができる。
101・・・流量制御機構
B ・・・ブレーキ
D ・・・ブレーキダイナモ
10 ・・・チャンバ
10S・・・収容空間
L1 ・・・供給流路
L2 ・・・メイン流路
L3 ・・・サンプリング流路
B ・・・メインポンプ(メイン流量調整部)
P ・・・サンプリングポンプ(サンプリング流量調整部)
F ・・・捕集フィルタ
20 ・・・制御装置
21 ・・・流量制御部
22 ・・・流速算出部
23 ・・・サイズ情報記憶部
24 ・・・ブレーキダスト量算出部
FM1・・・メイン流量計
FM2・・・サンプリング流量計
X ・・・サンプリングポイント
TS ・・・温度センサ
PS ・・・圧力センサ
なお、ブレーキダスト測定装置100としては、完成車両たる試験車両をシャシダイナモメータ上で走行させて、その試験車両のブレーキZの性能を試験するためのものであっても良い。
なお、ここでの捕集フィルタFは、上述したサンプリングポンプP2よりも上流側に配置されており、ブレーキダストによるサンプリングポンプP2の汚れを低減できるようにしてある。ただし、捕集フィルタFをサンプリングポンプP2の下流側に配置しても構わない。
すなわち、本実施形態のブレーキダスト測定装置100は、流量制御機構101によって、メイン流路L2の流量であるメイン流量に比例した流量となるように、メイン流路L2の流量と、サンプリング流路L3の流量であるサンプリング流量が設定される。
より詳細には、本実施形態の制御装置20は、図2に示すように、チャンバ10の断面積或いは断面積を算出するための径寸法など、チャンバ10のサイズ情報を記憶するサイズ情報記憶部23を備えており、流速算出部22は、検出温度、検出圧力、及びサイズ情報(例えば、チャンバ10の断面積)に基づいてブレーキZに当たるガスの流速を算出するように構成されている。
具体的にこの流量制御部21は、検出温度や検出圧力に基づいて算出された算出流速を用いて、メイン流量を制御するように構成されており、算出流速が所定の定流速となるように、メイン流量調整部P1(例えばメインポンプの回転数等)を制御する。
なお、本実施形態では上述したように、流量制御部21は、流速算出部22により算出された算出流速が所定の定流速となるように、メイン流量調整部P1たるメインポンプの例えば回転数等をフィードバック制御してメイン流量を制御する。
これならば、ブレーキZに当てる空気の流速を例えば実走行の車速に対応させて制御することができ、実走行を模擬した試験を行うことが可能となる。
これならば、採取したサンプルガスがメイン流路L2に戻された後の流量をメイン流量として計測することができるので、より精度良くサンプリング流量をメイン流量に比例した流量とすることができる。
具体的には、流量制御部21が、メイン流量計FM1により計測されたメイン流量に、サンプリング流量計FM2により計測されたサンプリング流量を加算して、その加算後の流量に基づいてメイン流量調整部P1とサンプリング流量調整部P2との一方又は両方を制御するように構成されていても良い。
なお、捕集フィルタF、ブレーキダスト量算出部、排ガス分析装置、DCS、PN計測器の少なくとも1つを含む概念をブレーキダスト分析部と呼んでも良い。
この場合、サンプリングバッグSBは、例えばサンプリング流量調整部P2の下流側に設けられていても良いし、図6に示すように、サンプリング流路L3とは別の第2のサンプリング流路L4に設けても良い。なお、図6に示す構成においては、第2のサンプリング流路L4には、第2のサンプリング流量調整部たるサンプリングポンプP3及び第2のサンプリング流量計FM3が設けられていても良い。なお、第2のサンプリング流路L4のサンプリングポイントは、サンプリング流路L3のサンプリングポイントXの上流であっても良いし、下流であっても良い。
このようにサンプリングバッグSBを備える構成において、サンプリングバッグに採取したサンプルガスの計測と、ブレーキダストの計測とは、同時に行われても良いし、別々に行われても良い。
具体的な実施態様としては、チャンバ10の側周面に空気の導入口10a及び導出口10bが設けられている態様を挙げることができる。なお、導入口10a及び導出口10bは、互いに対向するように配置されていても良いし、非対向な配置であっても良い。
Claims (14)
- ブレーキから発生するブレーキダストを測定するブレーキダスト測定装置であって、
前記ブレーキダストを含むサンプルガスが流れるメイン流路と、
前記メイン流路に設定されたサンプリングポイントに接続されて、前記サンプルガスの一部を採取するサンプリング流路と、
前記メイン流路の流量であるメイン流量に比例した流量となるように、前記サンプリング流路の流量であるサンプリング流量を制御する流量制御機構と、を備える、ブレーキダスト測定装置。 - 前記メイン流量が、前記ブレーキが収容される収容空間の温度又は圧力の少なくとも一方を用いて設定されている、請求項1記載のブレーキダスト測定装置。
- 前記流量制御機構が、前記収容空間の温度又は圧力の少なくとも一方に基づいて前記メイン流量を制御する、請求項1又は2記載のブレーキダスト測定装置。
- 前記ブレーキが収容される収容空間の温度又は圧力の少なくとも一方に基づいて前記ブレーキに当たるガスの流速を算出する流速算出部をさらに備え、
前記流量制御機構が、前記流速算出部により算出された算出流速に基づいて前記メイン流量を制御する請求項3記載のブレーキダスト測定装置。 - 前記メイン流路における前記サンプリングポイントよりも下流側に設けられたメイン流量計を備える、請求項1乃至4のうち何れか一項に記載のブレーキダスト測定装置。
- 前記流量制御機構が、車速を示す車速データに基づいて前記メイン流量を制御する、請求項1乃至5のうち何れか一項に記載のブレーキダスト測定装置。
- 前記流量制御機構が、
前記メイン流路に設けられて、当該メイン流路に引き込む前記サンプルガスの流量を調整するためのメイン流量調整部と、
前記サンプリング流路に設けられて、当該サンプリング流路に引き込む前記サンプルガスの流量を調整するためのサンプリング流量調整部と、
前記メイン流量調整部及び前記サンプリング流量調整部の一方又は両方を制御することにより、前記メイン流路の流量であるメイン流量に比例した流量となるように、前記サンプリング流路の流量であるサンプリング流量を制御する流量制御部と、を有する、請求項1乃至6のうち何れか一項に記載のブレーキダスト測定装置。 - 1回の試験におけるブレーキダスト量、又は、所定距離あたりのブレーキダスト量を算出するブレーキダスト量算出部を備える、請求項1乃至7のうち何れか一項に記載のブレーキダスト測定装置。
- 前記サンプリング流路に設けられて、採取された前記サンプルガスに含まれるブレーキダストを捕集する捕集部を備える、請求項1乃至8のうち何れか一項に記載のブレーキダスト測定装置。
- 前記サンプリング流路の下流側端部が、前記メイン流路における前記サンプリングポイントと前記メイン流量計との間に接続されており、前記サンプリング流路に採取した前記サンプルガスを前記メイン流路に戻すように構成されている、請求項5記載のブレーキダスト測定装置。
- 前記サンプリング流路に設けられたサンプリング流量計をさらに備え、
前記流量制御機構が、前記メイン流量計により計測されたメイン流量を、前記サンプリング流量計により計測されたサンプリング流量により補正する、請求項5記載のブレーキダスト測定装置。 - 前記ブレーキがセットされるブレーキダイナモをさらに備える、請求項1乃至11のうち何れか一項に記載のブレーキダスト測定装置。
- ブレーキから発生するブレーキダストを測定するブレーキダスト測定方法であって、
メイン流路に前記ブレーキダストを含むサンプルガスを流すステップと、
前記メイン流路に設定されたサンプリングポイントに接続されたサンプリング流路から、前記サンプルガスの一部を採取するステップと、
前記メイン流路の流量であるメイン流量に比例した流量となるように、前記サンプリング流路の流量であるサンプリング流量を制御するステップとを備える、ブレーキダスト測定方法。 - ブレーキから発生するブレーキダストを測定するブレーキダスト測定装置に用いられるブレーキダスト測定用プログラムであって、
前記ブレーキダスト測定装置が、前記ブレーキダストを含むサンプルガスが流れるメイン流路と、前記メイン流路に設定されたサンプリングポイントに接続されて、前記サンプルガスの一部を採取するサンプリング流路とを備えた構成において、
前記メイン流路の流量であるメイン流量に比例した流量となるように、前記サンプリング流路の流量であるサンプリング流量を制御する流量制御部としての機能をコンピュータに発揮させる、ブレーキダスト測定用プログラム。
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WO2019225443A1 (ja) * | 2018-05-22 | 2019-11-28 | 株式会社堀場製作所 | ブレーキダスト計測システム及びブレーキダスト計測方法 |
JP2020520448A (ja) * | 2017-05-02 | 2020-07-09 | ホリバ ヨーロッパ ゲーエムベーハー | ブレーキダストを検出及び測定するための装置 |
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JPS5540393U (ja) * | 1978-09-09 | 1980-03-15 | ||
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JP2020520448A (ja) * | 2017-05-02 | 2020-07-09 | ホリバ ヨーロッパ ゲーエムベーハー | ブレーキダストを検出及び測定するための装置 |
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