Road braking particulate matter collecting system based on real vehicle

Abstract

The invention relates to the technical field of brake particulate matter collection, and provides a road brake particulate matter collection system based on a real vehicle, the collection system is applied between a hub and a brake disc, and the collection system comprises a sampling device and a storage device; the sampling device and the storage device are arranged between a hub and a brake disc, and the sampling device and the storage device can synchronously rotate with wheels; the storage device comprises a main body part and a fixed part; the main body part and the fixed part are fixedly connected, the main body part and the sampling device are fixed, the main body part is installed between a hub and a brake disc, and the fixed part is connected with brake calipers through a steering knuckle. The sampling system is arranged between the hub and the brake disc, particulate matter generated in the braking process can be collected in real time, and it is ensured that collected samples have high time correlation and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of brake particulate collection, and particularly to a road brake particulate collection system based on a real vehicle. Background Art

[0002] With the acceleration of the electrification trend of passenger vehicles, the particulate emissions from motor vehicle exhausts are continuously decreasing. However, at the same time, the proportion of particulate matter generated during braking in traffic pollutants is gradually increasing. Therefore, how to study and control the particulate matter generated during braking has become a current research hotspot.

[0003] Currently, the emission testing of brake particulate matter mainly relies on the brake dynamometer method. This method measures the quantity and emission level of particulate matter during braking by simulating the braking process of the vehicle. The specific operation is to place the brake dynamometer in a relatively enclosed test chamber, use an external air flow to blow away the particulate matter generated during braking, and collect particulate matter samples through a sampling channel. The advantage of the brake dynamometer method is that it can standardize the test process, exclude the interference of the external environment, and is relatively easy to control the test conditions. However, the brake dynamometer method also has certain limitations. First, it belongs to a component testing method, usually placing the braking system in a relatively ideal experimental environment, and such test conditions often deviate from the actual driving environmental conditions (such as temperature and humidity, driving speed, braking frequency, etc.). Second, the dynamometer method fails to fully simulate all variables under real driving conditions. During actual driving, the deceleration process of the vehicle not only depends on mechanical braking but is also affected by driving resistance. Especially in electric vehicles, part of the deceleration is achieved by the motor regenerating energy, and this process hardly generates brake particulate matter. Therefore, the test results of the dynamometer method cannot fully represent the emission situation under real driving conditions and may have certain errors.

[0004] In order to more accurately evaluate the particulate emissions of electric vehicles during daily driving, more and more research tends to adopt a vehicle-based testing method. Vehicle testing can not only cover more driving conditions but also measure the emissions of brake particulate matter in real time in the actual driving environment, providing more real data. Vehicle testing can consider factors such as different road conditions, climate conditions, and driving habits, thus more comprehensively reflecting the emission level of brake particulate matter. Although this method has a higher technical difficulty and greater cost, it is of great significance in providing accurate data and guiding policy formulation.

[0005] In summary, with the advancement of the electrification process, the problem of brake particulate emissions has gradually emerged, and the traditional dynamometer method has been difficult to meet the increasingly strict test requirements. The research method based on vehicle testing, as a new direction, will play an increasingly important role in future particulate emission monitoring and control technologies. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the related art. For this purpose, the present invention provides a road braking particulate collection system based on a real vehicle, which installs a collection device between the wheel hub and the brake disc, can collect the emissions of braking particulate matter in real time in the actual driving environment, and is convenient for sampling and measurement.

[0007] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the collection device is applied between the wheel hub and the brake disc, and includes: a sampling device and a storage device; The sampling device includes a sampling head, the sampling head is installed between the wheel hub and the brake disc, and is configured to rotate synchronously with the wheel; The storage device includes a main body part and a fixing part; The main body part and the fixing part are fixedly connected, the main body part is connected to the sampling device, and the main body part is installed between the wheel hub and the brake disc, and the fixing part is connected to the brake caliper through a steering knuckle.

[0008] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the sampling head is a double-layer disc, the middle of the disc is in a funnel shape, the sampling head is connected to the collection cover, the funnel becomes smaller along the direction of particulate matter absorption, the bottom end of the funnel close to the collection cover is closed, and the bottom end of the funnel far from the collection cover is a through hole.

[0009] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the disc of the sampling head far from the collection cover is provided with a groove for assembling the sampling head bearing, and the sampling head is connected to the collection cover through the sampling head bearing.

[0010] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the outer diameter of the small end of the funnel does not exceed the radius of the central ring of the wheel hub.

[0011] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the main body part and the fixing part are fixedly connected by bolts.

[0012] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the main body part of the storage device and the sampling head are axially fixed.

[0013] According to an embodiment of the present invention, in the road braking particulate collection system based on a real vehicle, the outer shell of the storage device is arc-shaped and is used for cooperating with the brake caliper and the brake disc.

[0014] According to an embodiment of the present invention, the road braking particulate collection system based on a real vehicle further includes: a sampling probe and a sampling channel; The sampling probe and the sampling channel are successively installed on the other side of the wheel hub and fixedly connected to the sampling head.

[0015] The road braking particulate matter collection system based on a real vehicle according to an embodiment of the present invention further includes: a flange; The flange is fixed on the other side of the wheel hub, and the sampling passes through the flange and is connected to the sampling device. The sampling probe and the sampling channel are fixed on one side of the flange through a first flange bearing.

[0016] In the road braking particulate matter collection system based on a real vehicle according to an embodiment of the present invention, the brake disc, the wheel hub, the sampling head and the flange are provided with through holes for fixing the installation positions of the sampling head and the flange.

[0017] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects: An embodiment of the present invention provides a road braking particulate matter collection system based on a real vehicle, including a sampling device and a storage device; The sampling device includes a sampling head that can rotate synchronously with the wheel; the storage device includes a collection cover, and the collection cover includes a main body part and a fixing part; the main body part and the fixing part are fixedly connected, the main body part is connected to the sampling device, and the main body part is installed between the wheel hub and the brake disc, and the fixing part is connected to the brake caliper through a steering knuckle. By arranging a collection system between the wheel hub and the brake disc, it is possible to collect the particulate matter generated during the braking process in real time, ensuring that the collected samples have high temporal correlation and accuracy, and also reducing the impact of the environment on particulate matter collection.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of a road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention; Figure 2 is an exploded view of the parts of a road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention; Figure 3 It is a schematic structural diagram of the collection hood of the road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the sampling head of the road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention; Figure 5 It is an assembly sectional view of the road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention; Figure 6 It is a connection diagram of the road braking particulate matter collection system based on a real vehicle and an external collection device provided by an embodiment of the present invention.

[0021] Reference numerals: 1. Sampling probe; 2. First flange bearing; 3. Sampling channel; 4. Flange; 5. Second flange bearing; 6. Sampling head; 7. Sampling head bearing; 8. Wheel hub; 9. Collection hood; 91. Main body part; 92. Fixed part; 10. Brake disc; 11. Brake caliper; 12. Wheel hub bearing flange; 13. Steering knuckle. Detailed implementation manners

[0022] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0027] The present invention provides a road brake particulate collection system based on a real vehicle, which is applied between the real vehicle wheel hub and the brake disc, mainly to measure the emissions of brake particulates in real time during the actual driving of the running vehicle, provide more real and reliable data references, and provide a favorable basis for the emissions of brake particulates of real vehicles in the future.

[0028] An embodiment of one aspect of the present invention, in combination with Figure 1 As shown, an embodiment of the present invention provides a road brake particulate collection system based on a real vehicle. The collection system is applied between the wheel hub 8 and the brake disc 10, and includes a sampling device and a storage device. The storage device is arranged between the wheel hub 8 and the brake disc 10, making full use of the characteristics of the vehicle structure, and can also directly collect after sampling, and can collect the particulates during braking in real time when the vehicle is running, improving the collection rate.

[0029] Further, in combination with Figure 4As shown, the sampling device includes a sampling head 6. The sampling head 6 is a double-layer disc, and the middle of the disc is funnel-shaped. The small end of the funnel passes through the hub center ring, and the large end of the funnel is connected to the main body of the storage device. The funnel becomes smaller along the direction of particulate matter absorption. There are several through holes on the surface of the disc, and the through holes are used to fix the installation position of the sampling head. The sampling head 6 has two funnel shapes. The first funnel is far from the brake disc of the collection hood, and the second funnel is close to the brake disc. The bottom of the first funnel is through, and the bottom of the second funnel is closed. Particulate matter can enter the external sampling device along the space between the two funnels of the sampling head 6, ensuring the accuracy of particulate matter collection and maintaining the permeability of the structure. The sampling head 6 can also rotate synchronously with the hub without affecting vehicle driving. At the same time, due to the closed bottom of the second funnel, the overall device can also improve the sealing performance and prevent interference from the external environment to the collection.

[0030] Furthermore, since the road braking particulate matter collection system provided in this application is not specific to a particular vehicle model but gives a generally applicable structural design, the size of the funnel of the sampling head 6 should be designed based on the size of the vehicle's hub, and the outer diameter of the funnel should not exceed the radius of the hub center ring.

[0031] In this embodiment, the sampling device further includes a sampling probe 1 and a sampling channel 3. The sampling probe 1 and the sampling channel 6 are sequentially installed on the other side of the hub and are fixedly connected to the small end of the first funnel of the sampling head 6. Through the sampling device, real-time sampling during vehicle braking can be achieved, and the sampling process is also simplified.

[0032] Furthermore, in combination with Figure 3 As shown, the storage device includes a collection hood 9. The collection hood 9 is divided into a main body part 91 and a fixed part 92. The main body part 91 is fixed to the sampling device through a bearing, ensuring stability and flexibility during vehicle driving; the fixed part is connected to the brake caliper, enabling axial fixation of the fixed part, ensuring the structural integrity of the fixed part under driving conditions and facilitating disassembly; the main body part and the fixed part are connected by bosses and bolts welded on the surface, ensuring the stability of the storage device and achieving a good sealing effect to prevent particulate matter leakage. The installation distance between the sampling device and the collection device is close, and the connection channel is short, so that particulate matter can be directly collected after sampling, reducing the influence of the external environment on particulate matter collection. In addition, the close installation and short connection channel design between the sampling head 6 of the sampling device and the collection hood 9 of the collection device further reduce the loss of particulate matter during transmission and effectively resist interference from external environmental factors. In combination with Figure 2 and Figure 5As shown in the figure, the sampling probe 1, the sampling channel 3 and the flange 4 are installed on the other side of the wheel hub. The sampling probe 1 and the sampling channel 3 are connected by threads. There are a first flange bearing 2 and a second flange bearing 5 on both sides of the flange 4. Due to the existence of the flange 4, the first flange bearing 2 and the second flange bearing 5, when the vehicle is in motion, the wheel hub 8 can rotate continuously, and the relative positions of the sampling probe 1 and the sampling channel 3 can also be guaranteed to remain unchanged, greatly optimizing the layout of the particulate matter sampling equipment, simplifying the experimental process, and improving the accuracy and reliability of the data.

[0033] Furthermore, considering the safety issues during actual driving, the lengths of the sampling probe 1 and the sampling channel 3 do not exceed the length of the vehicle's rearview mirror extending out. In addition, due to the existence of the bearings, this part does not rotate with the rotation of the wheel hub during normal vehicle driving, but remains at the installation angle and will not affect the vehicle's driving.

[0034] In this embodiment, the sampling head 6 is arranged between the wheel hub 8 and the brake disc 10, and the sampling head 6 is connected to the collection hood 9 and fixed by wheel hub bolts to ensure that the sampling head 6 rotates synchronously with the wheel hub 8 during actual operation. A groove is provided on the outer circumference of the disc of the sampling head 6. A sampling head bearing 7 is installed on the outer circumference of the disc of the sampling head 6 close to the wheel hub 8. The sampling head bearing 7 is arranged between the sampling head 6 and the collection hood 9. The sampling head bearing 7 can maintain the sealing between the sampling head 6 and the collection hood 9 while the sampling head 6 rotates with the wheel hub 8; the sampling head bearing 7 can also keep the sampling head 6 rotating at the central position to prevent the sampling head 6 from shifting. This embodiment provides a working method of a road braking particulate matter collection system based on a real vehicle. The collection device is connected to an external particulate matter sampling device through the sampling probe 1.

[0035] In this embodiment, in combination with Figure 6 As shown in the figure, the external particulate matter sampling device used is the OBS-One device of Horiba Company. The sampling probe 1 is connected to the hose of the external particulate matter sampling device. The external particulate matter sampling device is placed inside the vehicle. The hose can enter the vehicle through the window or through the pipeline into the vehicle, facilitating direct sampling of the braking particulate matter during vehicle driving.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of this application.

Claims

1. A road brake particle collection system based on a real vehicle, the collection system is applied between the wheel hub and the brake disc, characterized in that: include: Sampling devices and storage devices; The sampling device comprises a sampling head, which is installed between the wheel hub and the brake disc and can rotate synchronously with the wheel; The storage device comprises a collection cover, and the collection cover comprises: a main body part and a fixing part; The main body part and the fixed part are fixedly connected, the main body part is connected to the sampling device, and the main body part is installed between the wheel hub and the brake disc, and the fixed part is connected to the brake caliper through the steering knuckle.

2. The road brake particle collection system based on a real vehicle according to claim 1 is characterized in that: The sampling head is a double-layer disc, the middle of the disc is funnel-shaped, the sampling head is connected to the collecting cover, the funnel becomes smaller along the direction of particle absorption, the bottom end of the funnel close to the collecting cover is closed, and the bottom end of the funnel away from the collecting cover is a through hole.

3. The road brake particle collection system based on a real vehicle according to claim 2 is characterized in that: A groove is formed on the disc of the sampling head away from the collecting cover. The groove is used to assemble the sampling head bearing. The sampling head is connected to the collecting cover via the sampling head bearing.

4. The road brake particle collection system based on a real vehicle according to claim 2 is characterized in that: The outer diameter of the small end of the funnel does not exceed the radius of the central ring of the hub.

5. The road brake particle collection system based on a real vehicle according to claim 1 is characterized in that: The main body part and the fixing part are fixedly connected by bolts.

6. The road brake particle collection system based on a real vehicle according to claim 2 is characterized in that: The main body of the storage device and the sampling head are axially fixed.

7. The road brake particle collection system based on a real vehicle according to claim 1 is characterized in that: The storage device housing is arc-shaped and is used to cooperate with the brake caliper and the brake disc.

8. The road brake particle collection system based on a real vehicle according to claim 2 is characterized in that: The sampling device also includes: a sampling probe and a sampling channel; The sampling probe and the sampling channel are sequentially mounted on the other side of the hub and are fixedly connected to the small end of the sampling head funnel.

9. The road brake particle collection system based on a real vehicle according to claim 8 is characterized in that: Also includes: Flange; The flange is fixed on the other side of the hub, and the sampling is connected to the sampling head by penetrating the flange. The sampling probe and the sampling channel are fixed on one side of the flange through a first flange bearing.

10. The road brake particle collection system based on a real vehicle according to claim 9, characterized in that: The brake disc, the wheel hub, the sampling head and the flange are provided with positioning holes for fixing the installation positions of the sampling head and the flange.

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