Tire and brake emissions particulate collection device

Abstract

The application discloses a kind of tire and brake discharging particulate matter collection device, it is related to motor vehicle emission pollutant test technical field, including tire particulate matter collection bin and brake particulate matter collection bin, the inner cavity upper portion of tire particulate matter collection bin is equipped with load exerting assembly, the bottom end of load exerting assembly is used to rotate and connect the tire to be measured;Tire particulate matter collection bin's inner cavity lower portion is equipped with tire live simulation assembly;Brake particulate matter collection bin is connected with tire particulate matter collection bin by intermediate connecting bin, brake is installed in brake particulate matter collection bin, brake is connected with tire and brake driving motor, brake is drivingly connected with the tire to be measured by universal transmission shaft.The application utilizes intermediate connecting bin to connect brake particulate matter collection bin and tire particulate matter collection bin, is separated by partition, tire and brake are independently arranged, prevent different sources of particulate matter to mix, meet the accuracy and analysis result of subsequent experiment of particulate matter.

Description

Technical Field

[0001] This invention relates to the field of motor vehicle emission pollutant testing technology, and more specifically to a tire and brake particulate matter collection device. Background Technology

[0002] With the rapid development of the automotive industry and the increasing awareness of environmental protection, the control and research of particulate matter emissions from automobiles have become particularly important. During vehicle operation, tire-road friction and brake wear generate non-exhaust particulate matter (NEE) emissions, which have certain impacts on the environment and human health. To achieve my country's automotive industry carbon peaking target and meet the requirements of the China VI emission standard, the control of NEE emissions presents new challenges.

[0003] Currently, various tire and brake particulate matter collection devices exist on the market, but several technical challenges arise in practical applications. The main issue lies in ensuring airtightness during the collection process, which directly impacts collection efficiency and may affect subsequent particulate matter analysis. Furthermore, existing devices often struggle to avoid mixing of particulate matter from different sources when collecting particulate matter from two different sources, affecting the accuracy and reliability of test results.

[0004] To address the aforementioned issues, there is an urgent need in the field for a tire and brake particulate matter collection device capable of efficiently collecting particulate matter, ensuring airtightness, and preventing the mixing of particulate matter from different sources. This device needs to be able to simulate vehicle loads during real-world driving, while ensuring the clarity of the source of the collected samples and the accuracy of the testing. Summary of the Invention

[0005] In view of this, the present invention provides a tire and brake particulate matter collection device to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tire and brake particulate matter collection device, comprising:

[0008] The tire particulate matter collection chamber has a load application component installed in the upper part of its inner cavity, and the bottom end of the load application component is used to rotatably connect to the tire under test; a tire condition simulation component is installed in the lower part of the inner cavity of the tire particulate matter collection chamber, and the tire condition simulation component is used to cooperate with the tire under test to simulate the road conditions of the tire under test.

[0009] A brake particulate matter collection chamber is arranged on one side of the tire particulate matter collection chamber and connected to the tire particulate matter collection chamber via an intermediate connecting chamber. The intermediate connecting chamber has a partition inside to isolate the brake particulate matter collection chamber and the tire particulate matter collection chamber. A brake is installed inside the brake particulate matter collection chamber. The shaft end of the brake away from the intermediate connecting chamber is connected to the tire and the power output end of the brake drive motor arranged outside the brake particulate matter collection chamber. The shaft end of the brake near the intermediate connecting chamber extends through the partition and is rotatably and sealed to the partition. It is also connected to the tire under test via a universal drive shaft.

[0010] Through the above technical solution, the present invention utilizes an intermediate connecting chamber to connect independent brake particulate matter collection chambers and tire particulate matter collection chambers. By separating them with partitions, the tires and brakes are arranged independently to prevent the mixing of particulate matter from different sources. By applying load to the tires individually through a load application component, and in conjunction with a tire real-world simulation component, the vehicle load during real driving is simulated, thus satisfying the accuracy and analysis results of subsequent particulate matter experiments.

[0011] Preferably, in the above-mentioned tire and brake particulate matter collection device, the upper part of the tire particulate matter collection chamber is connected to a tire particulate matter collection chamber air inlet, and the lower part of the tire particulate matter collection chamber is connected to a tire particulate matter collection chamber air outlet; the two sides of the brake particulate matter collection chamber are respectively connected to a brake particulate matter collection chamber air inlet and a brake particulate matter collection chamber air outlet. The collection chamber is purged through an air inlet pipe to improve particulate matter collection efficiency.

[0012] Preferably, in the above-mentioned tire and brake particulate matter collection device, the load application component includes a hydraulic electric actuator and a tire bracket; the fixing rod of the hydraulic electric actuator is fixed to the inner top wall of the tire particulate matter collection chamber, and its telescopic rod faces downward; the top surface of the tire bracket is connected to the end of the telescopic rod of the hydraulic electric actuator, the tire to be tested is fixed on the rotating shaft of the tire bracket, and the rotating shaft of the tire bracket is connected to the universal joint drive shaft. By controlling the extension and retraction of the hydraulic electric actuator, a load pressure is applied to the tire to be tested to meet the experimental requirements.

[0013] Preferably, in the above-described tire and brake particulate matter collection device, a pressure sensor is installed between the telescopic end of the hydraulic actuator and the top surface of the tire bracket. The pressure sensor is capable of detecting the applied pressure value.

[0014] Preferably, in the above-mentioned tire and brake particulate matter collection device, the tire real-world simulation component includes a drum support, a drum, and a drum drive motor. The drum support is fixed to the inner bottom wall of the tire particulate matter collection chamber. The drum is rotatably connected to the drum support, and the surface of the drum abuts against the tire under test. The drum drive motor is arranged on the outside of the tire particulate matter collection chamber, and the power output end of the drum drive motor passes through the side wall of the tire particulate matter collection chamber and is connected to the rotating shaft of the drum. The drum drive motor drives the drum to rotate, generating friction with the tire under test to simulate real road conditions.

[0015] Preferably, in the above-mentioned tire and brake particulate matter collection device, a temperature and humidity sensor is installed inside the tire particulate matter collection chamber. Before testing, airflow needs to be introduced into the particulate matter collection chamber. The temperature and humidity of the airflow should be consistent with the environment during vehicle operation, and the airflow rate should be kept constant. The temperature and humidity sensor can effectively detect the particulate matter.

[0016] Preferably, in the above-described tire and brake particulate matter collection device, a sealed ball bearing is installed between the partition and the connecting shaft of the brake. The sealed ball bearing ensures the sealing performance of the connecting shaft structure.

[0017] Preferably, in the above-mentioned tire and brake particulate matter collection device, the universal drive shaft is a drive shaft with a universal coupling, and the universal drive shaft is telescopic. Since the motor shaft and brake shaft are fixed in position, while the tire shaft undergoes vertical displacement before and after loading and under different loads, a drive shaft with a universal coupling is installed between the tire shaft and the brake shaft. This type of drive shaft is characterized by its ability to transmit power between two non-collinear shafts while maintaining a constant axial distance between the two shafts.

[0018] Preferably, in the above-described tire and brake particulate matter collection device, the interiors of both the tire particulate matter collection chamber and the brake particulate matter collection chamber are rounded. Rounding the corners inside the collection chambers prevents particulate matter accumulation and further improves collection efficiency.

[0019] Preferably, in the above-mentioned tire and brake particulate matter collection device, the tire particulate matter collection chamber, the brake particulate matter collection chamber and the intermediate connecting chamber are all assembled from stainless steel plates, and the assembly points are connected by bolts and gaskets to ensure the overall airtightness of the collection chamber.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a tire and brake particulate matter collection device, which has the following beneficial effects:

[0021] 1. Independent collection and simulation of real driving: The device is designed with a collection chamber that arranges the tires and brakes independently, which effectively avoids mutual interference of particulate matter from different emission sources and ensures the clarity of the source of the collected samples; applying load to the tires individually to simulate the vehicle load during real driving improves the accuracy and practicality of the test.

[0022] 2. High-efficiency collection and airtightness assurance: A transmission system was designed to ensure the airtightness of the overall device under different loads, avoiding particulate matter leakage and thus improving collection efficiency; the collection chamber was purged by the air inlet pipe, which further improved the collection efficiency of particulate matter and ensured the effective capture of particulate matter, providing a reliable basis for subsequent analysis.

[0023] 3. Optimized Material and Structural Design: The collection chamber is made of 304 stainless steel, which can withstand the pressure and vibration generated during the loading of the hydraulic push rod and the operation of the motor, ensuring the stability and durability of the device; bolts and gaskets are used at the joints of the steel plates to ensure the overall airtightness of the collection chamber and prevent particulate matter from leaking from the joints; the inside of the collection chamber is rounded to prevent particulate matter from accumulating and further improve collection efficiency.

[0024] 4. Innovative transmission design: A partition is installed between the tire particulate matter collection chamber and the brake particulate matter collection chamber, and a drive shaft with a sealed ball bearing and a universal coupling is installed to prevent the mixing of particulate matter in the two different collection chambers; the vertical displacement characteristics of the tire axle before and after loading are fully considered to ensure the stability and airtightness of the transmission system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 The attached figure is a schematic diagram of the tire and brake particulate matter collection device (the casing is shown as transparent) provided by the present invention;

[0027] Figure 2 The attached figure shows the tire and brake particulate matter collection device (the casing is transparent) provided by the present invention. Figure 1 A schematic diagram of the structure on the opposite side;

[0028] Figure 3 The attached figure is a front view of the tire and brake particulate matter collection device (the casing is shown as transparent) provided by the present invention;

[0029] Figure 4 The attached figure is a structural schematic diagram of the universal drive shaft provided by the present invention.

[0030] in:

[0031] 1-Tire particulate matter collection chamber;

[0032] 11-Air inlet of tire particulate matter collection chamber; 12-Air outlet of tire particulate matter collection chamber; 13-Temperature and humidity sensor;

[0033] 2-Brake particulate matter collection chamber;

[0034] 21-Air inlet of brake particulate matter collection chamber; 22-Air outlet of brake particulate matter collection chamber;

[0035] 3-Load application component;

[0036] 31-Hydraulic electric actuator; 32-Tire bracket; 33-Pressure sensor;

[0037] 4-The tire to be tested;

[0038] 5-Tire Real-World Simulation Component;

[0039] 51-Drum support; 52-Drum; 53-Drum drive motor;

[0040] 6-Intermediate connecting compartment;

[0041] 61-Partition plate; 62-Sealed ball bearing;

[0042] 7-Brake;

[0043] 8-Tire and brake drive motor;

[0044] 9-Universal drive shaft. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] See appendix Figure 1 To be continued Figure 4 This invention discloses a tire and brake particulate matter collection device, comprising:

[0047] The tire particulate matter collection chamber 1 has a load application component 3 installed in the upper part of its inner cavity. The bottom end of the load application component 3 is used to rotatably connect to the tire under test 4. The tire particulate matter collection chamber 1 has a tire condition simulation component 5 installed in the lower part of its inner cavity. The tire condition simulation component 5 is used to cooperate with the tire under test 4 to simulate the road conditions of the tire under test 4.

[0048] The brake particulate matter collection chamber 2 is located on one side of the tire particulate matter collection chamber 1 and is connected to the tire particulate matter collection chamber 1 through an intermediate connecting chamber 6. The intermediate connecting chamber 6 has a partition 61 inside to isolate the brake particulate matter collection chamber 2 and the tire particulate matter collection chamber 1. A brake 7 is installed inside the brake particulate matter collection chamber 2. The shaft end of the brake 7 away from the intermediate connecting chamber 6 is connected to the power output end of the tire and the brake drive motor 8 arranged on the outside of the brake particulate matter collection chamber 2. The shaft end of the brake 7 near the intermediate connecting chamber 6 extends through the partition 61 and is rotatably connected to the partition 61 in a sealed manner. It is also connected to the tire 4 under test through a universal drive shaft 9.

[0049] To further optimize the above technical solution, the upper part of the tire particulate matter collection chamber 1 is connected to the tire particulate matter collection chamber air inlet 11, and the lower part of the tire particulate matter collection chamber 1 is connected to the tire particulate matter collection chamber air outlet 12; the two sides of the brake particulate matter collection chamber 2 are respectively connected to the brake particulate matter collection chamber air inlet 21 and the brake particulate matter collection chamber air outlet 22.

[0050] To further optimize the above technical solution, the load application component 3 includes a hydraulic electric actuator 31 and a tire bracket 32; the fixing rod of the hydraulic electric actuator 31 is fixed on the inner top wall of the tire particulate matter collection chamber 1, and its telescopic rod faces downward; the top surface of the tire bracket 32 ​​is connected to the end of the telescopic rod of the hydraulic electric actuator 31, the tire to be tested 4 is fixed on the rotating shaft of the tire bracket 32, and the rotating shaft of the tire bracket 32 ​​is connected to the universal drive shaft 9.

[0051] To further optimize the above technical solution, a pressure sensor 33 is installed between the telescopic rod end of the hydraulic electric actuator 31 and the top surface of the tire bracket 32.

[0052] To further optimize the above technical solution, the tire real-world simulation component 5 includes a drum support 51, a drum 52, and a drum drive motor 53. The drum support 51 is fixed to the inner bottom wall of the tire particulate matter collection chamber 1. The drum 52 is rotatably connected to the drum support 51, and the surface of the drum 52 abuts against the tire 4 to be tested. The drum drive motor 53 is arranged on the outside of the tire particulate matter collection chamber 1. The power output end of the drum drive motor 53 passes through the side wall of the tire particulate matter collection chamber 1 and is connected to the rotating shaft of the drum 52.

[0053] To further optimize the above technical solution, a temperature and humidity sensor 13 is installed inside the tire particulate matter collection chamber 1.

[0054] To further optimize the above technical solution, a sealed ball bearing 62 is installed between the partition 61 and the connecting shaft of the brake 7.

[0055] To further optimize the above technical solution, the universal drive shaft 9 is a drive shaft with a universal coupling, and the universal drive shaft 9 can be extended and retracted.

[0056] To further optimize the above technical solution, the interiors of both the tire particulate matter collection chamber 1 and the brake particulate matter collection chamber 2 are rounded.

[0057] To further optimize the above technical solution, the tire particulate matter collection chamber 1, the brake particulate matter collection chamber 2 and the intermediate connecting chamber 6 are all assembled from stainless steel plates, and the assembly points are connected by bolts and gaskets.

[0058] In this embodiment, a schematic diagram of the collection device is shown below. Figures 1 to 3 As shown, the tire particulate matter collection chamber 1 and the brake particulate matter collection chamber 2 separate the tire 4 and the brake 7 under test into two independent parts.

[0059] Before the test begins, a load is applied to the tire 4 under test via the hydraulic electric push rod 31 according to the load of the simulated vehicle. At the same time, considering the inertial force generated by the vehicle during acceleration and braking, the corresponding speed and output torque of the drum drive motor 53 need to be calculated according to the vehicle rotational mass conversion factor δ. The calculation of δ is shown in equation (1):

[0060]

[0061] In the formula, m is the mass of the car (kg); r is the rolling radius of the wheel (m); i g i0 is the gear ratio of the transmission; i0 is the gear ratio of the main reducer; η is the gear ratio of the transmission. T For mechanical efficiency; I w Let G be the moment of inertia of the wheel, in kg·m 2 I f Let be the moment of inertia of the flywheel, in kg·m 2 .

[0062] And I w with I f The calculations are shown in equations (2) and (3) respectively:

[0063] I w =M w r 2 #(2)

[0064]

[0065] Taking a manual transmission gasoline sedan as an example (hereinafter referred to as the prototype vehicle), the gear ratios of each gear and the final drive ratio are known. First, the wheel rolling radius is measured. Then, the equivalent rotational mass of the wheels and the equivalent rotational mass of the flywheel are measured separately. Finally, the rotational mass conversion factor for each gear is calculated. The prototype vehicle weighs 1475 kg and is equipped with 185 / 65R15 tires, corresponding to a rolling radius of 0.302 m and a wheel moment of inertia ∑I. w It is 4.032 kg·m 2 Taking the first gear of the prototype vehicle as an example, the transmission ratio i g The ratio of the main reducer is 3.615, and the transmission ratio i0 of the main reducer is 4.056. According to formula (1), the rotational mass conversion factor of the prototype vehicle is 1.2989.

[0066] Before testing, airflow should be introduced into the particulate matter collection chamber. The temperature and humidity of the airflow should be consistent with the environment during vehicle operation, and the airflow rate should be kept constant.

[0067] After the test cycle officially begins, the tire and brake drive motor 8 and the drum drive motor 53 start synchronously, and the airflow is kept in the collection chamber. The required test cycle is completed by adjusting the speed of the motor and braking the brake. The collected particulate matter enters the corresponding analytical instrument through the air outlet and is analyzed after the test is completed.

[0068] Since the particulate matter collection chamber needs to collect particulate matter from two sources simultaneously, and to ensure the reliability and accuracy of test results such as particulate matter concentration and quantity, it is necessary to ensure the collection efficiency of the device. The following are specific measures:

[0069] The collection chamber is made of 304 stainless steel, which can withstand the pressure and vibration generated during the loading of the hydraulic push rod and the operation of the electric motor. Bolts and gaskets are used at the joints of the steel plates to ensure the overall airtightness of the collection chamber. In addition, the inside of the collection chamber needs to be rounded to prevent the accumulation of particles and further improve the collection efficiency.

[0070] A partition 61 is provided in the intermediate connecting chamber 6 between the tire particulate matter collection chamber 1 and the brake particulate matter collection chamber 2, such as... Figure 3 As shown, the left side of partition 61 is the tire particulate matter collection chamber 1, and the right side is the brake particulate matter collection chamber 2. There is relative movement between the universal joint drive shaft 9 and partition 61. A sealed ball bearing 62 is installed between the universal joint drive shaft 9 and partition 61 to prevent particulate matter from mixing in the two different collection chambers. Since the positions of the motor shaft and brake shaft are fixed, while the tire shaft undergoes vertical displacement before and after loading and under different loads, a drive shaft with a universal coupling is installed between the tire shaft and brake shaft. The universal joint drive shaft 9 is telescopic. The characteristic of this type of drive shaft is that it can transmit power between two non-collinear shafts while maintaining a constant axial distance between the two shafts. Figure 4 As shown. This transmission design avoids any gaps within the collection chamber, maximizing the overall airtightness of the collection chamber and improving the particulate matter collection efficiency.

[0071] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tire and brake emissions particulate collection device characterized by, It includes: The inner cavity of the tire particle collecting bin (1) is provided with a load applying assembly (3) at the upper part, the bottom end of the load applying assembly (3) is used for rotatingly connecting a tire (4) to be tested; the inner cavity of the tire particle collecting bin (1) is provided with a tire real-time simulation assembly (5) at the lower part, the tire real-time simulation assembly (5) is used for cooperating with the tire (4) to be tested to simulate the running road condition of the tire (4) to be tested; The brake particle collecting bin (2) is arranged on one side of the tire particle collecting bin (1) and is connected with the tire particle collecting bin (1) through an intermediate connecting bin (6), the intermediate connecting bin (6) is internally provided with a partition plate (61) for separating the brake particle collecting bin (2) and the tire particle collecting bin (1); the brake particle collecting bin (2) is internally provided with a brake (7), the shaft end of the brake (7) away from the intermediate connecting bin (6) is connected with the power output end of a tire and brake driving motor (8) arranged outside the brake particle collecting bin (2), the shaft end of the brake (7) close to the intermediate connecting bin (6) extends through the partition plate (61) and is sealingly and rotatably connected with the partition plate (61) and is drivingly connected with the tire (4) to be tested through a universal transmission shaft (9).

2. A tire and brake particulate emission collection device as defined in claim 1, wherein, The upper part of the tire particle collecting bin (1) is connected with a tire particle collecting bin air inlet (11), the lower part of the tire particle collecting bin (1) is connected with a tire particle collecting bin air outlet (12); the brake particle collecting bin (2) is connected with a brake particle collecting bin air inlet (21) and a brake particle collecting bin air outlet (22) on the two sides respectively.

3. A tire and brake emission particulate collection device as defined in claim 1, wherein, The load applying assembly (3) includes a hydraulic electric push rod (31) and a tire support (32); the fixed rod of the hydraulic electric push rod (31) is fixed on the inner top wall of the tire particle collecting bin (1) and the telescopic rod thereof faces downward; The top surface of the tire support (32) is connected with the end head of the telescopic rod of the hydraulic electric push rod (31), the tire (4) to be tested is fixed on the rotating shaft of the tire support (32), and the rotating shaft of the tire support (32) is connected with the universal transmission shaft (9).

4. A tire and brake particulate emission collection device as defined in claim 3, wherein, A pressure sensor (33) is arranged between the end head of the telescopic rod of the hydraulic electric push rod (31) and the top surface of the tire support (32).

5. A tire and brake emission particulate collection device as defined in claim 1, wherein, The tire real-time simulation assembly (5) includes a drum support (51), a drum (52) and a drum driving motor (53); the drum support (51) is fixed on the inner bottom wall of the tire particle collecting bin (1), the drum (52) is rotatably connected with the drum support (51), the surface of the drum (52) abuts against the tire (4) to be tested, and the drum driving motor (53) is arranged outside the tire particle collecting bin (1), the power output end of the drum driving motor (53) penetrates through the side wall of the tire particle collecting bin (1) and is connected with the rotating shaft of the drum (52).

6. A tire and brake particulate emission collection device as defined in claim 1, wherein, The inside of the tire particle collecting bin (1) is provided with a temperature and humidity sensor (13).

7. A tire and brake emission particulate collection device as defined in claim 1, wherein, A sealing ball bearing (62) is arranged between the partition plate (61) and the connecting shaft of the brake (7).

8. A tire and brake particulate emission collection device as defined in claim 1, wherein, The universal transmission shaft (9) is a transmission shaft with a universal coupling, and the universal transmission shaft (9) can realize telescopic extension.

9. A tire and brake particulate emission collection device as defined in claim 1 wherein, The inside of the tire particle collecting bin (1) and the inside of the brake particle collecting bin (2) are both rounded.

10. A tire and brake exhaust particulate matter collection device as defined in claim 1, wherein, The tire particle collecting bin (1), the brake particle collecting bin (2) and the intermediate connecting bin (6) are all composed of stainless steel plates, and the assembling parts are connected by bolts and sealing pads.

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