A road braking particulate matter collection system based on real vehicles

Abstract

The present invention relates to the technical field of brake particulate matter collection, and provides a road brake particulate matter collection system based on an actual vehicle. The collection system is applied between the wheel hub and the brake disc, and includes a sampling device and a storage device; the sampling device and the storage device are arranged between the wheel hub and the brake disc, and the sampling device and the storage device can rotate synchronously with the wheel; the storage device includes a main body and a fixed part; the main body and the fixed part are fixedly connected, the main body is fixed to the sampling device, and the main body is installed between the wheel hub and the brake disc, and the fixed part is connected to the brake caliper via a steering knuckle. By arranging the sampling system between the wheel hub and the brake disc, particulate matter generated during braking can be collected in real time, ensuring that the collected samples have high time correlation and accuracy.

Description

Technical Field

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

[0002] As the electrification trend of passenger vehicles accelerates, particulate matter emissions from motor vehicle exhaust continue to decrease. However, at the same time, the proportion of particulate matter generated during braking in traffic pollutants has gradually increased. Therefore, how to study and control particulate matter generated during braking has become a current research hotspot.

[0003] Currently, brake particulate matter emissions testing primarily relies on the brake bench method. This method simulates the vehicle braking process to measure the amount and level of particulate matter emitted during braking. Specifically, the brake bench is placed in a relatively closed test chamber. External airflow is used to sweep away particulate matter generated during braking, and particulate matter samples are collected through a sampling channel. The advantage of the brake bench method is that it standardizes the testing process, eliminates external environmental interference, and makes it easier to control test conditions. However, the brake bench method also has certain limitations. First, it is a component testing method that typically places the brake system in a relatively ideal experimental environment. Such test conditions often deviate from actual driving conditions (such as temperature and humidity, driving speed, and braking frequency). Second, the brake bench method fails to fully simulate all variables in real-world driving conditions. In real-world driving, vehicle deceleration relies not only on mechanical braking but also on driving resistance. In electric vehicles, this is particularly true because some deceleration is achieved through electric motor regenerative power, a process that generates little brake particulate matter. Therefore, test results from the brake bench method may not fully represent emissions under real-world driving conditions and may contain certain errors.

[0004] To more accurately assess particulate matter emissions from electric vehicles during daily driving, a growing number of studies are adopting whole-vehicle testing methods. Whole-vehicle testing not only covers a wider range of driving conditions but also allows for real-time measurement of brake particulate matter emissions in a realistic driving environment, providing more realistic data. Whole-vehicle testing can account for factors such as road conditions, climate conditions, and driving habits, providing a more comprehensive picture of brake particulate matter emissions. While this method is technically challenging and costly, it is crucial in providing accurate data and guiding policymaking.

[0005] In short, with the advancement of electrification, brake particulate matter emissions are becoming increasingly prominent, and traditional test bench methods are no longer able to meet increasingly stringent testing requirements. Research methods based on whole-vehicle testing, as an emerging direction, will play an increasingly important role in future particulate matter emission monitoring and control technologies. Summary of the Invention

[0006] The present invention aims to address at least one of the technical problems existing in the related art. To this end, it proposes a road brake particulate matter collection system based on a real vehicle. The collection device is installed between the wheel hub and the brake disc. This system can collect brake particulate matter emissions in real time during actual driving conditions, facilitating sampling and measurement.

[0007] According to the road brake particulate matter collection system based on a real vehicle according to an embodiment of the present invention, the collection device is applied between the wheel hub and the brake disc, and includes: a sampling device and a storage device;

[0008] The sampling device includes a sampling head, which is installed between the wheel hub and the brake disc and can rotate synchronously with the wheel;

[0009] The storage device includes a main body portion and a fixing portion;

[0010] The main body and the fixed part are fixedly connected, the main body is connected to the sampling device, and the main body is installed between the wheel hub and the brake disc, and the fixed part is connected to the brake caliper through the steering knuckle.

[0011] According to the road brake particulate matter collection system based on a real vehicle according to an embodiment of the present invention, the sampling head is a double-layer disc, the middle of the disc is funnel-shaped, 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 away from the collection cover is a through hole.

[0012] According to the road brake particulate matter collection system based on a real vehicle according to an embodiment of the present invention, a groove is provided on the disc of the sampling head away from the collection cover, and the groove is used to assemble the sampling head bearing, and the sampling head is connected to the collection cover via the sampling head bearing.

[0013] According to the road brake particulate matter collection system based on a real vehicle in an embodiment of the present invention, the outer diameter of the small end of the funnel does not exceed the radius of the center ring of the wheel hub.

[0014] According to the road brake particulate matter collection system based on a real vehicle in an embodiment of the present invention, the main body part and the fixing part are fixedly connected by bolts.

[0015] According to the road brake particulate matter collection system based on a real vehicle in an embodiment of the present invention, the main body of the storage device and the sampling head are axially fixed.

[0016] According to the road brake particulate matter collection system based on a real vehicle in an embodiment of the present invention, the storage device housing is arc-shaped and is used to cooperate with the brake caliper and the brake disc.

[0017] The road braking particulate matter collection system based on a real vehicle according to an embodiment of the present invention further includes: a sampling probe and a sampling channel;

[0018] The sampling probe and the sampling channel are sequentially mounted on the other side of the hub and fixedly connected to the sampling head.

[0019] The road brake particulate matter collection system based on a real vehicle according to an embodiment of the present invention further includes: a flange;

[0020] The flange is fixed on the other side of the hub, and the sampling is connected to the sampling device by passing through the flange. The sampling probe and the sampling channel are fixed on one side of the flange through a first flange bearing.

[0021] According to the road brake particulate matter collection system based on a real vehicle in 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.

[0022] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0023] An embodiment of the present invention provides a road brake particulate matter collection system based on a real vehicle, comprising a sampling device and a storage device;

[0024] The sampling device includes a sampling head that rotates synchronously with the wheel; the storage device includes a collection hood, which consists of a main body and a fixed portion. The main body and the fixed portion are fixedly connected. The main body is connected to the sampling device and is installed between the wheel hub and the brake disc. The fixed portion is connected to the brake caliper via a steering knuckle. By placing a collection system between the wheel hub and the brake disc, particulate matter generated during braking can be collected in real time, ensuring high temporal relevance and accuracy of the collected samples and reducing the impact of environmental factors on particulate matter collection.

[0025] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This 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;

[0028] Figure 2 This is an exploded view of the parts of a road brake particulate matter collection system based on a real vehicle provided by an embodiment of the present invention;

[0029] Figure 3 This is a schematic structural diagram of a collection cover of a road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of a sampling head of a road braking particulate matter collection system based on a real vehicle provided by an embodiment of the present invention;

[0031] Figure 5 is an assembly cross-sectional view of a road brake particulate matter collection system based on a real vehicle provided by an embodiment of the present invention;

[0032] Figure 6 This is a connection diagram of a road brake particulate matter collection system based on a real vehicle and an external collection device provided by an embodiment of the present invention.

[0033] Reference numerals:

[0034] 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 cover; 91. Main body; 92. Fixed part; 10. Brake disc; 11. Brake caliper; 12. Wheel hub bearing flange; 13. Steering knuckle. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the embodiments of the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0038] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0040] The present invention provides a road brake particulate matter collection system based on a real vehicle, which is used between the wheel hub and brake disc of a real vehicle. It mainly measures the emission of brake particulate matter in real time for the running vehicle in the actual driving environment, provides more real and reliable data reference, and lays a favorable foundation for the future emission of brake particulate matter from real vehicles.

[0041] 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 matter 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 realize direct collection after sampling, and can collect particulate matter generated by braking of the car in real time, thereby improving the collection rate.

[0042] Further, combined Figure 4 As shown, the sampling device includes a sampling head 6, which is a double-layered disc. The middle of the disc is funnel-shaped. The small end of the funnel passes through the central ring of the wheel hub, 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 particle 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 away from the collection cover brake disc, 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. Particles can enter the external sampling device along the two funnels of the sampling head 6, ensuring the accuracy of particle collection and maintaining the permeability of the structure. The sampling head 6 can also rotate synchronously with the wheel hub without affecting the driving of the vehicle. At the same time, since the bottom of the second funnel is closed, the entire device can also improve the sealing performance to prevent interference with the collection from the external environment.

[0043] Furthermore, since the road brake particulate matter collection system based on a real vehicle provided in this application is not targeted at a specific vehicle model, but provides a structural design with universal applicability, the size of the funnel of the sampling head 6 should be designed based on the size of the vehicle's wheel hub, and the outer diameter of the funnel should not exceed the radius of the center ring of the wheel hub.

[0044] In this embodiment, the sampling device also includes a sampling probe 1 and a sampling channel 3. The sampling probe 1 and the sampling channel 6 are installed in sequence on the other side of the wheel hub and fixedly connected to the small end of the first funnel of the sampling head 6. The sampling device can realize real-time sampling when the vehicle is braked, and also simplifies the sampling process.

[0045] Further, combined Figure 3 As shown, the storage device includes a collecting cover 9, and the collecting cover 9 is divided into a main part 91 and a fixed part 92. The main part 91 is fixed by a bearing and a sampling device, which ensures the stability and flexibility of the vehicle during driving; the fixed part is connected to the brake caliper, which can achieve axial fixation of the fixed part, ensuring the structural integrity of the fixed part under driving conditions, and is also easy to disassemble; the main part and the fixed part are connected by surface-welded bosses and bolts to ensure the stability of the storage device and achieve a good sealing effect to prevent leakage of particulate matter. The sampling device and the collecting device are installed at a close distance, and the connecting channel is short, which can also realize direct collection of particulate matter after sampling, reducing the influence of the external environment on the collection of particulate matter. In addition, the close installation and short connecting channel design between the sampling head 6 of the sampling device and the collecting cover 9 of the collecting device further reduce the loss of particulate matter during transmission and effectively resist the interference of external environmental factors.

[0046] Combine Figure 2 and Figure 5As shown, the sampling probe 1, sampling channel 3, and flange 4 are mounted on the other side of the wheel hub. The sampling probe 1 and sampling channel 3 are connected by threads, and the flange 4 is flanked by a first flange bearing 2 and a second flange bearing 5. Due to the presence of flange 4, first flange bearing 2, and second flange bearing 5, the wheel hub 8 can continue to rotate while the vehicle is in motion, and the sampling probe 1 and sampling channel 3 can maintain a constant relative position. This greatly optimizes the layout of the particulate matter sampling equipment, simplifies the experimental process, and improves the accuracy and reliability of the data.

[0047] Furthermore, considering safety issues during actual driving, the length of the sampling probe 1 and sampling channel 3 does not exceed the length of the vehicle's rearview mirror. In addition, due to the presence of the bearing, this part does not rotate with the rotation of the wheel hub during normal driving, but maintains the installation angle and does not affect the vehicle's driving.

[0048] 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 collecting cover 9 and fixed by the wheel hub bolts to ensure that the sampling head 6 rotates synchronously with the wheel hub 8 during actual operation.

[0049] The sampling head 6 has a circular disc with a groove on its outer circumference. A sampling head bearing 7 is mounted on the outer circumference of the sampling head 6 near the wheel hub 8. The sampling head bearing 7 is disposed between the sampling head 6 and the collection hood 9. The sampling head bearing 7 maintains the seal 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 also keeps the sampling head 6 rotating in the center position, preventing the sampling head 6 from shifting. This embodiment provides a method for operating a road brake particulate matter collection system based on an actual vehicle. The collection device is connected to an external particulate matter sampling device via a sampling probe 1.

[0050] In this embodiment, combined with Figure 6 As shown, 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 in the car. The hose can enter the car through the window or the pipeline, which is convenient for direct sampling of brake particulate matter while the car is driving.

[0051] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and are therefore intended to be included within the scope of protection of this application.

Claims

1. A road brake particulate matter 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 includes a sampling head, which is installed between the wheel hub and the brake disc and can rotate synchronously with the wheel; The storage device includes a collection cover, and the collection cover includes: a main body portion and a fixing portion; The main body and the fixed part are fixedly connected, the main body is connected to the sampling device, and the main body is installed between the wheel hub and the brake disc, and the fixed part is connected to the brake caliper through the steering knuckle; The sampling head is a double-layer disc, the middle of which is funnel-shaped. The sampling head is connected to the collection cover. The funnel becomes smaller along the direction of particle absorption. The bottom end of the funnel close to the collection cover is closed, and the bottom end of the funnel away from the collection cover is a through hole.

2. The road brake particulate matter collection system based on a real vehicle according to claim 1 is characterized in that: A groove is provided on the disc of the sampling head away from the collecting cover. The groove is used to assemble a sampling head bearing. The sampling head is connected to the collecting cover via the sampling head bearing.

3. The road braking particulate matter collection system based on a real vehicle according to claim 1 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.

4. The road brake particulate matter 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.

5. The road brake particulate matter collection system based on a real vehicle according to claim 1 is characterized in that: The main body of the storage device and the sampling head are axially fixed.

6. The road brake particulate matter 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.

7. The road brake particulate matter collection system based on a real vehicle according to claim 1 is characterized in that: The sampling device further comprises: 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.

8. The road brake particulate matter collection system based on a real vehicle according to claim 7 is characterized in that: Also includes: flange; The flange is fixed on the other side of the hub, and the sampling channel passes through the flange and is connected to the sampling head. The sampling probe and the sampling channel are fixed to one side of the flange via a first flange bearing.

9. The road brake particulate matter collection system based on a real vehicle according to claim 8 is 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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