Multi-device linkage closed chamber automobile brake particulate matter detection system and method

Abstract

The invention relates to the technical field of automobile brake emission testing, in particular to a multi-device linkage closed chamber automobile brake particulate matter detection system and method. The system comprises a closed chamber, a brake simulation device is arranged in the closed chamber, and the brake simulation device is sequentially connected with a climate simulation device, a climate monitoring device, a collection and detection device and a system control device outside the closed chamber through gas pipelines. According to the invention, by constructing the multi-device linkage closed chamber automobile brake particulate matter detection system, comprehensive and accurate detection of particulate matters in the whole braking process is realized; each module of the system undertakes a specific function, and mutual data transmission and instruction response are realized through gas pipelines and electrical connection, so that the accuracy and repeatability of detection are improved, the cooperative work of the devices is ensured, and the generation condition of particulate matters in the braking process can be analyzed more comprehensively.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake emission testing, and in particular to a closed chamber automobile brake particle detection system and method with multiple devices linked together. Background Art

[0002] With the rapid development of the economy, vehicle emissions have become the main source of urban air pollution, among which brake wear particles (BWPs) are particularly prominent in non-exhaust emissions, seriously threatening air quality and human health. The increase in the concentration of these particles will have adverse effects on the human respiratory system, cardiovascular system, reproductive system and skin, and long-term exposure is more likely to increase the risk of cancer. To solve this problem, technicians have made many efforts, such as the particle collection and detection device and method disclosed in Chinese patent CN108663293A. The device includes a particle analyzer and a sampling pipeline for analyzing particulate matter in a semiconductor processing chamber. However, for the detection of particulate matter generated during automobile braking, existing methods still face challenges such as insufficient accuracy, poor repeatability and uncontrollable detection environment, and need to be further improved and perfected. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a closed chamber automobile brake particle detection system and method with multiple devices linked.

[0004] The technical solution adopted by the present invention is as follows: A closed chamber automobile brake particle detection system with multiple devices linked together includes a closed chamber, a brake simulation device is arranged in the closed chamber, and the brake simulation device is sequentially connected to a climate simulation device, a climate monitoring device, a collection and detection device, and a system control device outside the closed chamber through a gas pipeline, wherein: A brake simulation device, including a motor drive mechanism and a hydraulic system, connected to a brake disc through the motor drive mechanism and connected to a brake pad through the hydraulic system, for simulating a braking process; The climate simulation device includes a climate chamber and a climate simulation component located in the climate chamber; the climate simulation component includes a thermometer, a dehumidifier and an air purifier; the climate chamber is arranged on one side of the closed chamber and connected to the gas pipeline of the brake simulation device, the climate simulation component changes the climate parameters of the air simulation gas accordingly, the air simulation gas in the climate chamber is passed into the chamber by the blower, and the particulate matter generated during the simulated braking process is sent to the collection and detection device; The climate monitoring device includes a detection mechanism I and a detection mechanism II. The detection mechanism I is arranged in a gas pipeline connected to the brake simulation device, and is used to collect climate parameters input into the brake simulation device and climate parameters outputted therefrom, and to change the climate parameters to meet standard conditions according to experimental requirements; the detection mechanism II is arranged at the brake disc and brake pad in the closed chamber, and is used to collect temperature parameters in the detection device and to plot the average temperature collected in the brake simulation device into an image; The collecting and detecting device includes a collecting film and an electric mobility particle size spectrometer. The collecting film is located at the air outlet pipe of the brake simulator. The collecting film is divided into several layers of films and is used to collect particles of different diameters. The particles are weighed by a weighing sensor to calculate their mass fraction. The electric mobility particle size spectrometer is used to detect the particle size distribution and number concentration, and finally summarize the sample data. The system control device, including a C2000 series microcontroller, cooperates with a brake simulation device, a climate simulation device, a climate monitoring device and a collection and detection device to obtain repeated and accurate detection data.

[0005] This technical solution realizes precise control and data collection of the entire system, ensures the coordinated work between various devices, and thus improves the accuracy and repeatability of detection. Specifically, the system includes braking simulation, climate simulation, climate monitoring, collection detection and system control; each module has a specific function, and realizes data transmission and command response between each other through gas pipelines and electrical connections; the climate simulation device can simulate climate conditions similar to those in the actual road braking process through the blowing mechanism and thermometer in the climate chamber; the detection mechanism I dynamically adjusts the climate parameters such as temperature and humidity according to the standard experimental conditions to simulate the braking process under different environments, which is used to eliminate the influence of environmental factors on the test results and improve the reliability of the data; the detection mechanism II in the climate monitoring device is responsible for real-time monitoring of the temperature parameters in the closed chamber to ensure that the average temperature collected by the braking simulation device can be recorded in time; the collection film in the collection detection device is set The multi-layer structure can collect particles of different diameters, improve the collection efficiency of particles, and facilitate the subsequent analysis of particle size distribution and number concentration of particles; the combined use of weighing sensor and electric mobility particle size spectrometer provides an accurate means for the detection of mass fraction, particle size distribution and number concentration of particles, and more comprehensively understands the generation of particles during braking; the C2000 series microcontroller is not only responsible for collecting data from each device, but also has powerful data processing capabilities, real-time data analysis, and adjusts system parameters according to the analysis results to ensure the accuracy and repeatability of detection; through the cooperation of the system control device and each module, the system can form a closed-loop feedback mechanism; when abnormal conditions or data deviations are detected, parameters are automatically adjusted or alarms are issued to ensure smooth detection.

[0006] In addition, the above-mentioned closed chamber automobile brake particle detection system with multiple devices linked together according to the present invention also has the following additional technical features: According to one embodiment of the present invention, the closed chamber is a cavity isolated from external climate conditions and noise, and is used to avoid sharp bending and sudden changes in the cross section, thereby achieving uniform particle distribution, good transport efficiency and shorter residence time to reduce the flow recirculation area.

[0007] This technical solution ensures uniform particle distribution, good transport efficiency and short residence time by setting up a closed chamber that is isolated from external climate conditions and noise, so as to reduce the flow recirculation area and optimize the brake particle detection environment.

[0008] According to one embodiment of the present invention, in the brake simulation device, the motor drive mechanism is connected to the brake disc to control the rotational acceleration and rotational speed of the brake disc; The hydraulic system is connected to the brake pads, including brake calipers and hydraulic devices, which are used to simulate the energy lost by brake pad friction during actual braking, and to reproduce the braking load, braking intensity of the brake pads on the brake disc, and braking frequency.

[0009] This technical solution uses the coordination of the motor drive mechanism and the hydraulic system to accurately control the motor power and speed to achieve the brake disc speed, braking load, braking intensity and frequency parameters, while adjusting the working temperature, humidity, wind speed and other climates of the brake disc to simulate the real braking process.

[0010] According to one embodiment of the present invention, in the climate simulation device, a climate simulation component and air simulation gas are provided in the climate chamber, and a detection mechanism I is provided on the inlet and outlet pipes of the brake simulation device; the air inlet pipe and the air outlet pipe of the brake simulation device are both U-shaped, and the inner walls of the air inlet pipe and the air outlet pipe are provided with antistatic coating and anti-corrosion coating.

[0011] This technical solution uses a variety of climate simulation devices and detection mechanism I in the climate simulation device, combined with U-shaped air inlet and outlet ducts and anti-static and anti-corrosion coatings, and the connection of the detection mechanism I to simulate a specific proportion of air simulation gas, thereby providing stable climate conditions for brake particle detection.

[0012] According to one embodiment of the present invention, the climate monitoring device is respectively connected to the climate simulation device and the brake simulation device, the detection mechanism I includes air flow rate, air pressure, and temperature acquisition units, and the detection mechanism II has several temperature acquisition units distributed at equal intervals along the radial direction of the brake disc, and uses the average data collected by the several acquisition units as the input signal of the system control device.

[0013] This technical solution uses the temperature acquisition unit of the detection mechanism I in the climate monitoring device as the input signal of the system control device to ensure the temperature control accuracy during the braking simulation process. The temperature acquisition unit in the detection mechanism II collects the average temperature to clearly observe the temperature changes during the braking process.

[0014] According to one embodiment of the present invention, in the collection and detection device, the electric mobility particle size spectrometer includes a particle statistical analysis module and an evaluation module, wherein: Particle statistical analysis module, used to count particle size, quantity and composition; Evaluation module, used to obtain the particle diameter distribution and number variation law under different standardized cycle test conditions based on the particle size, number and composition of the particles.

[0015] This technical solution collects the particle statistical analysis and evaluation module of the electric mobility particle size spectrometer in the detection device to comprehensively obtain the particle size, quantity and composition information of the particles, and analyzes the particle diameter distribution and quantity change pattern under different standardized cycle test conditions.

[0016] According to one embodiment of the present invention, the collection and detection device further includes a calibration and data quality control device to perform multi-point calibration on the electric mobility particle size spectrometer; Calibration and data quality control device, multi-concentration calibration of the electric mobility particle size spectrometer through nano-metal particle standards, size calibration of the electric mobility particle size spectrometer through product specification grades or metal particle standards, and calibration of the system control device through particulate matter generated by the smoke generator.

[0017] This technical solution collects the calibration and data quality control devices in the detection device, performs multi-point, multi-concentration and size calibration on the electric mobility particle size spectrometer, and calibrates the system control device through the smoke generator to ensure the accuracy and reliability of the detection data.

[0018] According to one embodiment of the present invention, the system control device obtains a motor control curve by controlling the brake simulation device and calculating the electromagnetic torque of the motor; and then selects a suitable motor to be connected to the brake disc as a brake inertia simulation drive source: ( )(1) (2) Where: t is a certain moment, t0 is the initial moment, T(t) is the torque of the drive motor, ω(t) is the motor rotation angular velocity, m is the mass of the vehicle, v is the instantaneous speed of the vehicle at a certain moment, v0 is the initial speed of the vehicle, μ is the friction factor, g is the acceleration of gravity, v(t) is the function of the vehicle running speed and time, A is the vehicle positive projection area, ρ is the air density, Cd is the air resistance coefficient, and Q is the energy lost by brake disc friction; By reproducing the rotation speed and rotation acceleration of the brake disc movement: (3) (4) Where: The torque provided by the motor during braking. is the resistance torque of the vehicle on the ground, is the resistance torque of the brake pad on the brake disc, is the rotational acceleration of the brake disc, is the torque of the experimental motor drive, The quality of the brake disc; The friction torque and energy changes between the brake disc and the brake pad directly reproduce the brake pedal travel change rate of the actual road test process during the experiment, that is, the pressure change between the brake pad and the brake disc.

[0019] This technical solution controls the brake simulation device through the system control device, calculates the motor electromagnetic torque and obtains the motor control curve, selects a suitable motor as the brake inertia simulation drive source, and directly reproduces the brake pedal travel change rate of the actual road test process, that is, the pressure change between the brake pad and the brake disc, by reproducing the rotation speed and rotational acceleration of the brake disc movement, so as to simulate the actual braking process and obtain accurate brake particle detection data.

[0020] To achieve the above-mentioned purpose, the present invention also provides a closed chamber automobile brake particle detection method with multiple devices linked together.

[0021] A closed chamber automobile brake particle detection method with multiple devices linked together comprises the following steps: S1. Circulation and system control: When the system is started, the climate simulation component built into the climate chamber is activated and a preset proportion of air simulation gas is introduced into the sealed chamber; S2. Data collection and parameter adjustment: Detection unit I is responsible for capturing the climate parameters input into and output from the brake simulation system, fine-tuning the collected climate parameters, and dynamically adjusting the climate parameters, including temperature, humidity and wind speed, based on the formation mechanism of brake wear particles; S3. Air simulation gas control transmission: The detection mechanism II in the climate monitoring device is responsible for collecting the temperature changes between the brake pads and the brake disc in the brake simulation device.

[0022] S4, motor drive and brake simulation: The motor drive mechanism is started, and the brake disc is driven by controlling the power and speed of the motor. The hydraulic system is connected to the brake pad, and the brake simulation process is started, covering the control of the brake disc speed, brake load, brake force and brake frequency. The particles generated during the braking process are introduced into the sealed chamber and transported to the subsequent processing unit through the air system. S5. Particle detection and analysis: The collection film is placed at the exhaust duct outlet of the brake simulation system to capture particles of different sizes. The particles are then accurately weighed by a weighing sensor to calculate their mass percentage. The electric mobility particle size spectrometer is used to determine the particle size distribution and number concentration of the particles, and the particle statistical analysis module counts the particle size, number and composition. The evaluation module analyzes the diameter distribution and number change pattern of the particles under different standardized cycle test conditions based on the above data. The detection and control system summarizes the data of all equipment and conducts a comprehensive analysis. The braking system is analyzed in depth by combining the brake disc energy distribution ratio with the actual road test data. The test results with high repeatability and reproducibility are output to evaluate the generation of particles during braking. After the test, the system automatically resets.

[0023] This technical solution realizes the closed chamber automobile brake particle detection with multi-device linkage. First, in the circulation and system regulation stage, the system starts and activates the blower assembly in the climate chamber, and introduces a preset proportion of air simulation gas into the sealed chamber, providing a stable environmental basis for subsequent brake simulation and particle detection; through data collection and parameter adjustment steps, the detection mechanism I captures the climate parameters input into the brake simulation system in real time, and dynamically adjusts these parameters according to the formation mechanism of brake wear particles to ensure that the experimental conditions are as consistent as possible with the actual braking process; then the brake simulation step begins, and the motor drive mechanism drives the brake disc by controlling the power and speed of the motor in conjunction with the hydraulic system (simulating the angle change of the driver's brake pedal during the real braking process), simulating the real braking process, including the control of key parameters such as brake disc speed, brake load, brake force and brake frequency; during the braking process, the detection mechanism II is responsible for collecting the temperature changes between the brake pad and the brake disc in the brake simulation device. The generated particles are introduced into the sealed chamber and transported to the subsequent processing unit through the gas system; in the particle detection and analysis stage, the film is collected to capture particles of different sizes, the weighing sensor accurately weighs the particles and calculates the mass ratio, and the electric mobility particle size spectrometer uses the particle statistical analysis module to count the particle size, quantity and composition; the evaluation module analyzes the diameter distribution and quantity change of particles under different standardized cycle test conditions based on these data; the detection and control system summarizes the data of all equipment for comprehensive analysis, and combines the "brake disc energy distribution ratio" with the actual road measurement data to conduct in-depth braking theory analysis of the braking system, and outputs test results with high repeatability and reproducibility to comprehensively evaluate the generation of particles during braking. After the test, the system automatically resets and prepares for the next test.

[0024] According to one embodiment of the present invention, in the motor drive and braking simulation of step S4, a motor vehicle with good performance is selected and the vehicle parameter information is determined, and an angle sensor is installed at a suitable position of the wheel hub; a braking test is performed on a road of a specified length, the wheel angle data is recorded, and the braking system information is collected through OBD, the vehicle throttle, brake and speed are read, and the functional relationship between the wheel speed, brake pedal travel change rate, brake oil pressure parameters and time is obtained; the ground friction coefficient, the vehicle's orthographic projection area, the air density, and the air resistance coefficient are measured.

[0025] This technical solution selects motor vehicles with good performance and determines vehicle parameter information, installs angle sensors on the wheel hub, conducts braking tests on a road of specified length, records wheel angle data and collects braking system information through OBD, and measures relevant physical parameters (such as ground friction factor, vehicle orthographic projection area, air density, air resistance coefficient, etc.) at the same time to derive the functional relationship between wheel speed, brake pedal travel change rate, brake oil pressure parameters and time, thereby comprehensively simulating and analyzing the braking process and providing accurate braking simulation data for subsequent particle detection and analysis.

[0026] Compared with the prior art, the present invention has the following beneficial effects: (1) By building a closed-chamber automobile brake particle detection system with multiple devices linked together, comprehensive and accurate detection of particles during the entire braking process can be achieved. The system includes multiple modules such as brake simulation, climate simulation, climate monitoring, collection detection and system control. Each module has a specific function and realizes data transmission and command response between each other through gas pipelines and electrical connections. This not only improves the accuracy and repeatability of detection, but also ensures the coordinated work between various devices, so as to more comprehensively analyze the generation of particles during the braking process. (2) The authenticity and reliability of braking simulation are improved by optimizing system design and adjusting parameters. The system uses a motor vehicle with good performance to conduct braking experiments and records key parameters such as wheel rotation angle data and brake system information. At the same time, it measures relevant physical parameters to derive functional relationships such as wheel speed and brake pedal travel change rate. The climate simulation device can simulate climate conditions similar to those in the actual road braking process, and the detection agency dynamically adjusts the climate parameters according to the generation law of brake wear particles, jointly ensuring that the braking simulation process is as close to the actual situation as possible, providing accurate experimental data for subsequent particle detection and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the system of the present invention.

[0028] Figure 2 It is a flow diagram of the method of the present invention.

[0029] In the figure: 1. Climate simulation device; 2. Climate monitoring device; 3. Braking simulation device; 4. Collection and detection device. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a closed chamber automobile brake particle detection system with multiple devices linked, including a closed chamber, a brake simulation device 3 is arranged in the closed chamber, and the brake simulation device 3 is sequentially connected to the climate simulation device 1, the climate monitoring device 2, the collection and detection device 4, and the system control device outside the closed chamber through a gas pipeline, wherein: The brake simulation device 3 includes a motor drive mechanism and a hydraulic system, the motor drive mechanism is connected to the brake disc, and the hydraulic system is connected to the brake pad, for simulating the braking process; The climate simulation device 1 includes a climate chamber and a climate simulation component located in the climate chamber; the climate simulation component includes a thermometer, a dehumidifier and an air purifier; the climate chamber is arranged on one side of the closed chamber and connected to the gas pipeline of the brake simulation device 3, the climate simulation component changes the climate parameters of the air simulation gas accordingly, the air simulation gas in the climate chamber is passed into the chamber by the blower, and the particulate matter generated by the simulated braking process is sent to the collection and detection device 4; The climate monitoring device 2 includes a detection mechanism I and a detection mechanism II. The detection mechanism I is arranged in a gas pipeline connected to the brake simulation device 3, and is used to collect climate parameters input into the brake simulation device 3 and climate parameters outputted therefrom, and to change the climate parameters to meet standard conditions according to experimental requirements; the detection mechanism II is arranged at the brake disc and brake pad in the closed chamber, and is used to collect temperature parameters in the detection device 4 and to plot the average temperature collected in the brake simulation device 3 into an image; The collecting and detecting device 4 includes a collecting film and an electric mobility particle size spectrometer. The collecting film is located at the air outlet pipe of the brake simulation device 3. The collecting film is divided into several layers of films and is used to collect particles of different diameters. The particles are weighed by a weighing sensor to calculate their mass fractions. The electric mobility particle size spectrometer is used to detect the particle size distribution and number concentration, and finally summarize the sample data. The system control device, including a C2000 series microcontroller, cooperates with the brake simulation device 3, the climate simulation device 1, the climate monitoring device 2 and the collection and detection device 4 to obtain repeated and accurate detection data.

[0032] This technical solution realizes precise control and data collection of the entire system, ensures the coordinated work between various devices, and thus improves the accuracy and repeatability of detection. Specifically, the system includes brake simulation, climate simulation, climate monitoring, collection detection and system control; each module has a specific function, and realizes data transmission and command response between each other through gas pipelines and electrical connections; the climate simulation device 1 can simulate the climate conditions similar to the actual road braking process through the blowing mechanism and thermometer in the climate chamber; the detection mechanism I dynamically adjusts the climate parameters such as temperature and humidity according to the standard experimental conditions to simulate the braking process under different environments, which is used to eliminate the influence of environmental factors on the test results and improve the reliability of the data; the detection mechanism II in the climate monitoring device 2 is responsible for real-time monitoring of the temperature parameters in the closed chamber to ensure that the average temperature collected by the brake simulation device 3 can be recorded in time; the collection film in the collection detection device 4 Designed as a multi-layer structure, it can collect particles of different diameters, improve the collection efficiency of particles, and facilitate the subsequent analysis of particle size distribution and number concentration of particles; the combined use of weighing sensors and electric mobility particle size spectrometers provides an accurate means for the detection of mass fraction, particle size distribution and number concentration of particles, and more comprehensively understands the generation of particles during braking; the C2000 series microcontroller is not only responsible for collecting data from each device, but also has powerful data processing capabilities, real-time data analysis, and adjusts system parameters according to the analysis results to ensure the accuracy and repeatability of detection; through the coordination of the system control device and various modules, the system can form a closed-loop feedback mechanism; when abnormal conditions or data deviations are detected, parameters are automatically adjusted or alarms are issued to ensure smooth detection.

[0033] In addition, the above-mentioned closed chamber automobile brake particle detection system with multiple devices linked together according to the present invention also has the following additional technical features: According to one embodiment of the present invention, the closed chamber is a cavity isolated from external climate conditions and noise, and is used to avoid sharp bending and sudden changes in the cross section, thereby achieving uniform particle distribution, good transport efficiency and shorter residence time to reduce the flow recirculation area.

[0034] This technical solution ensures uniform particle distribution, good transport efficiency and short residence time by setting up a closed chamber that is isolated from external climate conditions and noise, so as to reduce the flow recirculation area and optimize the brake particle detection environment.

[0035] According to an embodiment of the present invention, in the brake simulation device 3, the motor drive mechanism is connected to the brake disc to control the rotational acceleration and rotational speed of the brake disc; The hydraulic system is connected to the brake pads, including brake calipers and hydraulic devices, which are used to simulate the energy lost by brake pad friction during actual braking, and to reproduce the braking load, braking intensity of the brake pads on the brake disc, and braking frequency.

[0036] This technical solution uses the coordination of the motor drive mechanism and the hydraulic system to accurately control the motor power and speed to achieve the brake disc speed, braking load, braking intensity and frequency parameters, while adjusting the working temperature, humidity, wind speed and other climates of the brake disc to simulate the real braking process.

[0037] According to one embodiment of the present invention, in the climate simulation device 1, a climate simulation component and air simulation gas are provided in the climate chamber, and a detection mechanism I is provided on the inlet and outlet pipes of the brake simulation device 3; the air inlet pipe and the air outlet pipe of the brake simulation device 3 are both U-shaped, and the inner walls of the air inlet pipe and the air outlet pipe are provided with antistatic coating and anti-corrosion coating.

[0038] This technical solution uses a variety of climate simulation devices 1 and detection mechanism I in the climate simulation device 1, combined with U-shaped air inlet and outlet ducts and anti-static and anti-corrosion coatings, and the connection of the detection mechanism I to simulate a specific proportion of air simulation gas, thereby providing stable climate conditions for brake particle detection.

[0039] According to one embodiment of the present invention, the climate monitoring device 2 is respectively connected to the climate simulation device 1 and the brake simulation device 3, the detection mechanism I includes air flow rate, air pressure, and temperature acquisition units, and the detection mechanism II has several temperature acquisition units distributed at equal intervals along the radial direction of the brake disc, and uses the average data collected by the several acquisition units as the input signal of the system control device.

[0040] This technical solution uses the temperature acquisition unit of the detection mechanism I in the climate monitoring device 2 as the input signal of the system control device to ensure the temperature control accuracy during the braking simulation process. The temperature acquisition unit in the detection mechanism II collects the average temperature to clearly observe the temperature changes during the braking process.

[0041] According to one embodiment of the present invention, in the collection and detection device 4, the electric mobility particle size spectrometer includes a particle statistical analysis module and an evaluation module, wherein: Particle statistical analysis module, used to count particle size, quantity and composition; Evaluation module, used to obtain the particle diameter distribution and number variation law under different standardized cycle test conditions based on the particle size, number and composition of the particles.

[0042] This technical solution collects the particle statistical analysis and evaluation module of the electric mobility particle size spectrometer in the detection device 4 to comprehensively obtain the particle size, quantity and composition information of the particles, and analyzes the particle diameter distribution and quantity change law under different standardized cycle test conditions.

[0043] According to one embodiment of the present invention, the collection and detection device 4 further includes a calibration and data quality control device to perform multi-point calibration on the electric mobility particle size spectrometer; Calibration and data quality control device, multi-concentration calibration of the electric mobility particle size spectrometer through nano-metal particle standards, size calibration of the electric mobility particle size spectrometer through product specification grades or metal particle standards, and calibration of the system control device through particulate matter generated by the smoke generator.

[0044] This technical solution collects the calibration and data quality control device in the detection device 4, performs multi-point, multi-concentration and size calibration on the electric mobility particle size spectrometer, and calibrates the system control device through the smoke generator to ensure the accuracy and reliability of the detection data.

[0045] According to one embodiment of the present invention, the system control device obtains a motor control curve by controlling the brake simulation device 3 and calculating the electromagnetic torque of the motor; and then selects a suitable motor to be connected to the brake disc as a brake inertia simulation drive source: ( )(1) (2) Where: t is a certain moment, t0 is the initial moment, T(t) is the torque of the drive motor, ω(t) is the motor rotation angular velocity, m is the mass of the vehicle, v is the instantaneous speed of the vehicle at a certain moment, v0 is the initial speed of the vehicle, μ is the friction factor, g is the acceleration of gravity, v(t) is the function of the vehicle running speed and time, A is the vehicle positive projection area, ρ is the air density, Cd is the air resistance coefficient, and Q is the energy lost by brake disc friction; By reproducing the rotation speed and rotation acceleration of the brake disc movement: (3) (4) Where: The torque provided by the motor during braking. is the resistance torque of the vehicle on the ground, is the resistance torque of the brake pad on the brake disc, is the rotational acceleration of the brake disc, is the torque of the experimental motor drive, The quality of the brake disc; The friction torque and energy changes between the brake disc and the brake pad directly reproduce the brake pedal travel change rate of the actual road test process during the experiment, that is, the pressure change between the brake pad and the brake disc.

[0046] This technical solution controls the brake simulation device 3 through the system control device, calculates the motor electromagnetic torque and obtains the motor control curve, selects a suitable motor as the brake inertia simulation drive source, and directly reproduces the brake pedal travel change rate of the actual road test process, that is, the pressure change between the brake pad and the brake disc, by reproducing the rotation speed and rotational acceleration of the brake disc movement, so as to simulate the actual braking process and obtain accurate brake particle detection data.

[0047] Example 2 Based on Example 1, Figure 1 and Figure 2 As shown, this embodiment provides a closed chamber automobile brake particle detection method with multiple devices linked together, comprising the following steps: S1. Circulation and system control: When the system is started, the climate simulation component built into the climate chamber is activated and a preset proportion of air simulation gas is introduced into the sealed chamber; S2. Data collection and parameter adjustment: Detection unit I is responsible for capturing the climate parameters input into and output from the brake simulation system, fine-tuning the collected climate parameters, and dynamically adjusting the climate parameters, including temperature, humidity and wind speed, based on the formation mechanism of brake wear particles; S3. Air simulation gas control transmission: The detection mechanism II in the climate monitoring device 2 is responsible for collecting the temperature changes between the brake pad and the brake disc in the brake simulation device 3.

[0048] S4, motor drive and brake simulation: The motor drive mechanism is started, and the brake disc is driven by controlling the power and speed of the motor. The hydraulic system is connected to the brake pad, and the brake simulation process is started, covering the control of the brake disc speed, brake load, brake force and brake frequency. The particles generated during the braking process are introduced into the sealed chamber and transported to the subsequent processing unit through the air system. S5. Particle detection and analysis: The collection film is placed at the exhaust duct outlet of the brake simulation system to capture particles of different sizes. The particles are then accurately weighed by a weighing sensor to calculate their mass percentage. The electric mobility particle size spectrometer is used to determine the particle size distribution and number concentration of the particles, and the particle statistical analysis module counts the particle size, number and composition. The evaluation module analyzes the diameter distribution and number change pattern of the particles under different standardized cycle test conditions based on the above data. The detection and control system summarizes the data of all equipment and conducts a comprehensive analysis. The braking system is analyzed in depth by combining the brake disc energy distribution ratio with the actual road test data. The test results with high repeatability and reproducibility are output to evaluate the generation of particles during braking. After the test, the system automatically resets.

[0049] This technical solution realizes the closed chamber automobile brake particle detection with multi-device linkage. First, in the circulation and system control stage, the system starts and activates the blower assembly in the climate chamber, and introduces a preset proportion of air simulation gas into the sealed chamber, providing a stable environmental basis for subsequent brake simulation and particle detection; through data collection and parameter adjustment steps, the detection mechanism I captures the climate parameters input into the brake simulation system in real time, and dynamically adjusts these parameters according to the formation mechanism of brake wear particles to ensure that the experimental conditions are as consistent as possible with the actual braking process; then the brake simulation step begins, and the motor drive mechanism drives the brake disc by controlling the power and speed of the motor in conjunction with the hydraulic system (simulating the angle change of the driver's brake pedal during the actual braking process), simulating the actual braking process, including the control of key parameters such as brake disc speed, brake load, brake force and brake frequency; during the braking process, the detection mechanism II is responsible for collecting the temperature changes between the brake pad and the brake disc in the brake simulation device 3. The generated particles are introduced into the sealed chamber and transported to the subsequent processing unit through the gas system; in the particle detection and analysis stage, the collection film captures particles of different sizes, and the particles are accurately weighed and the mass ratio is calculated through the weighing sensor, while the electric mobility particle size spectrometer counts the particle size, quantity and composition through the particle statistical analysis module; the evaluation module analyzes the diameter distribution and quantity change law of particles under different standardized cycle test conditions based on these data; the detection and control system summarizes the data of all equipment for comprehensive analysis, and combines the "brake disc energy distribution ratio" with the actual road test data to conduct in-depth braking theory analysis of the braking system, and outputs test results with high repeatability and reproducibility to comprehensively evaluate the generation of particles during braking. After the test, the system automatically resets and prepares for the next test.

[0050] According to one embodiment of the present invention, in the motor drive and braking simulation of step S4, a motor vehicle with good performance is selected and the vehicle parameter information is determined, and an angle sensor is installed at a suitable position of the wheel hub; a braking test is performed on a road of a specified length, the wheel angle data is recorded, and the braking system information is collected through OBD, the vehicle throttle, brake and speed are read, and the functional relationship between the wheel speed, brake pedal travel change rate, brake oil pressure parameters and time is obtained; the ground friction coefficient, the vehicle's orthographic projection area, the air density, and the air resistance coefficient are measured.

[0051] This technical solution selects motor vehicles with good performance and determines vehicle parameter information, installs angle sensors on the wheel hub, conducts braking tests on a road of specified length, records wheel angle data and collects braking system information through OBD, and measures relevant physical parameters (such as ground friction factor, vehicle orthographic projection area, air density, air resistance coefficient, etc.) at the same time to derive the functional relationship between wheel speed, brake pedal travel change rate, brake oil pressure parameters and time, thereby comprehensively simulating and analyzing the braking process and providing accurate braking simulation data for subsequent particle detection and analysis.

[0052] It should be noted that this experiment uses a climate simulation device 1 to eliminate external particulate matter interference, making it more accurate to evaluate the impact of a single variable on emission results. At the same time, the laboratory environment makes particulate matter collection and detection more objective and accurate. Using motors to simulate vehicle inertia effectively reduces experimental costs and energy consumption, which is of great significance to promoting sustainable development. In addition, the experimental equipment is simple to operate and maintain, and requires low professional skills from the operator. The controllability and repeatability of laboratory tests facilitate subsequent researchers to conduct tests under multivariate conditions and gain a deeper understanding.

[0053] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A closed chamber automobile brake particle detection system with multiple devices linked together, characterized in that: The invention comprises a closed chamber, wherein a brake simulation device (3) is arranged in the closed chamber, and the brake simulation device (3) is sequentially connected to a climate simulation device (1), a climate monitoring device (2), a collection and detection device (4), and a system control device outside the closed chamber through a gas pipeline, wherein: A brake simulation device (3), comprising a motor drive mechanism and a hydraulic system, the motor drive mechanism is connected to a brake disc, and the hydraulic system is connected to a brake pad, for simulating a braking process; The climate simulation device (1) comprises a climate chamber and a climate simulation component located in the climate chamber; the climate simulation component comprises a thermometer, a dehumidifier and an air purifier; the climate chamber is arranged on one side of the closed chamber and is connected to the gas pipeline of the brake simulation device (3); the climate simulation component changes the climate parameters of the air simulation gas accordingly, and the air simulation gas in the climate chamber is passed into the chamber by a blower, and the particulate matter generated during the simulated braking process is sent to the collection and detection device (4); The climate monitoring device (2) comprises a detection mechanism I and a detection mechanism II. The detection mechanism I is arranged in a gas pipeline connected to the brake simulation device (3) and is used to collect climate parameters input into the brake simulation device (3) and climate parameters outputted therefrom, and to change the climate parameters to meet standard conditions according to experimental requirements; the detection mechanism II is arranged at the brake disc and brake pad in the closed chamber and is used to collect temperature parameters in the detection device (4) and to plot the average temperature collected in the brake simulation device (3) into an image; The collecting and detecting device (4) comprises a collecting film and an electric mobility particle size spectrometer. The collecting film is located at the outlet pipe of the brake simulation device (3). The collecting film is divided into several layers of films and is used to collect particles of different diameters. The particles are weighed by a weighing sensor to calculate their mass fraction. The electric mobility particle size spectrometer is used to detect the particle size distribution and number concentration, and finally summarize the sample data. The system control device includes a C2000 series microcontroller, which cooperates with a brake simulation device (3), a climate simulation device (1), a climate monitoring device (2) and a collection and detection device (4) to obtain repeated and accurate detection data.

2. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 1 is characterized in that: The closed chamber is a cavity isolated from external climate conditions and noise, and is used to avoid sharp bending and sudden changes in cross-section, thereby achieving uniform particle distribution, good transport efficiency and shorter residence time to reduce flow recirculation areas.

3. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 1, characterized in that: In the brake simulation device (3), the motor drive mechanism is connected to the brake disc and is used to control the rotational acceleration and rotational speed of the brake disc; The hydraulic system is connected to the brake pads, including brake calipers and hydraulic devices, which are used to simulate the energy lost by brake pad friction during actual braking, and to reproduce the braking load, braking intensity of the brake pads on the brake disc, and braking frequency.

4. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 1 or 3, characterized in that: In the climate simulation device (1), a climate simulation component and air simulation gas are provided in the climate chamber, and a detection mechanism I is provided on the inlet and outlet pipes of the brake simulation device (3); the air inlet pipe and the air outlet pipe of the brake simulation device (3) are both U-shaped, and the inner walls of the air inlet pipe and the air outlet pipe are both provided with antistatic coating and anti-corrosion coating.

5. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 1, characterized in that: The climate monitoring device (2) is connected to the climate simulation device (1) and the brake simulation device (3) respectively. The detection mechanism I includes air flow rate, air pressure, and temperature acquisition units, and the detection mechanism II has a plurality of temperature acquisition units distributed at equal intervals along the radial direction of the brake disc, and uses the average data collected by the plurality of acquisition units as the input signal of the system control device.

6. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 5, characterized in that: In the collection and detection device (4), the electric mobility particle size spectrometer comprises a particle statistical analysis module and an evaluation module, wherein: Particle statistical analysis module, used to count particle size, quantity and composition; Evaluation module, used to obtain the particle diameter distribution and number variation law under different standardized cycle test conditions based on the particle size, number and composition of the particles.

7. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 6, characterized in that: The collection and detection device (4) also includes a calibration and data quality control device to perform multi-point calibration on the electric mobility particle size spectrometer; Calibration and data quality control device, multi-concentration calibration of the electric mobility particle size spectrometer through nano-metal particle standards, size calibration of the electric mobility particle size spectrometer through product specification grades or metal particle standards, and calibration of the system control device through particulate matter generated by the smoke generator.

8. The closed chamber automobile brake particle detection system with multiple devices linked as claimed in claim 1, characterized in that: The system control device obtains a motor control curve by controlling the brake simulation device (3) and calculating the electromagnetic torque of the motor; then a suitable motor is selected to be connected to the brake disc to serve as a brake inertia simulation drive source: （ ）（1） （2） Where: t is a certain moment, t0 is the initial moment, T(t) is the torque of the drive motor, ω(t) is the motor rotation angular velocity, m is the mass of the vehicle, v is the instantaneous speed of the vehicle at a certain moment, v0 is the initial speed of the vehicle, μ is the friction factor, g is the acceleration of gravity, v(t) is the function of the vehicle running speed and time, A is the vehicle positive projection area, ρ is the air density, Cd is the air resistance coefficient, and Q is the energy lost by brake disc friction; By reproducing the rotation speed and rotation acceleration of the brake disc movement: （3） （4） Where: The torque provided by the motor during braking. is the resistance torque of the vehicle on the ground, is the resistance torque of the brake pad on the brake disc, is the rotational acceleration of the brake disc, is the torque of the experimental motor drive, The quality of the brake disc; The friction torque and energy changes between the brake disc and the brake pad directly reproduce the brake pedal travel change rate of the actual road test process during the experiment, that is, the pressure change between the brake pad and the brake disc.

9. A method for detecting particulate matter in a closed chamber of automobile brakes with multiple devices linked together, using the closed chamber automobile brake particulate matter detection system with multiple devices linked together as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1. Circulation and system control: When the system is started, the climate simulation component built into the climate chamber is activated and a preset proportion of air simulation gas is introduced into the sealed chamber; S2. Data collection and parameter adjustment: Detection unit I is responsible for capturing the climate parameters input into and output from the brake simulation system, fine-tuning the collected climate parameters, and dynamically adjusting the climate parameters, including temperature, humidity and wind speed, based on the formation mechanism of brake wear particles; S3. Air simulation gas control transmission: The detection mechanism II in the climate monitoring device is responsible for collecting the temperature changes between the brake pad and the brake disc in the brake simulation device (3). S4, motor drive and brake simulation: The motor drive mechanism is started, and the brake disc is driven by controlling the power and speed of the motor. The hydraulic system is connected to the brake pad, and the brake simulation process is started, covering the control of the brake disc speed, brake load, brake force and brake frequency. The particles generated during the braking process are introduced into the sealed chamber and transported to the subsequent processing unit through the air system. S5. Particle detection and analysis: The collection film is placed at the exhaust duct outlet of the brake simulation system to capture particles of different sizes. The particles are then accurately weighed by a weighing sensor to calculate their mass percentage. The electric mobility particle size spectrometer is used to determine the particle size distribution and number concentration of the particles, and the particle statistical analysis module counts the particle size, number and composition. The evaluation module analyzes the diameter distribution and number change pattern of the particles under different standardized cycle test conditions based on the above data. The detection and control system summarizes the data of all equipment and conducts a comprehensive analysis. The braking system is analyzed in depth by combining the brake disc energy distribution ratio with the actual road test data. The test results with high repeatability and reproducibility are output to evaluate the generation of particles during braking. After the test, the system automatically resets.

10. The closed chamber automobile brake particle detection method with multiple devices linked as claimed in claim 9, characterized in that: In the motor drive and brake simulation of step S4, a motor vehicle with good performance is selected and the vehicle parameter information is determined, and an angle sensor is installed at a suitable position of the wheel hub; a braking test is performed on a road of a specified length, the wheel angle data is recorded, and the brake system information is collected through OBD, the vehicle throttle, brake and speed are read, and the functional relationship between the wheel speed, brake pedal travel change rate, brake oil pressure parameters and time is obtained; the ground friction factor, the vehicle's orthographic projection area, the air density, and the air resistance coefficient are measured.

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