CN115371801A - Analysis method, test method and device for creep noise of vehicle braking system - Google Patents
Analysis method, test method and device for creep noise of vehicle braking system Download PDFInfo
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- CN115371801A CN115371801A CN202211024503.3A CN202211024503A CN115371801A CN 115371801 A CN115371801 A CN 115371801A CN 202211024503 A CN202211024503 A CN 202211024503A CN 115371801 A CN115371801 A CN 115371801A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application discloses a creep noise analysis method, a test method and a test device for a vehicle brake system. The creep noise analysis method for the vehicle brake system comprises the following steps: acquiring creep noise test data of a brake system to be tested, which is mounted on a vehicle, in each brake state, wherein the brake states comprise a normal-temperature brake state, a water spraying brake state and a water spraying overnight brake state; acquiring a weight coefficient of each brake state; and acquiring the creep noise level of the brake system to be tested according to the creep noise test data and the weight coefficient under each brake state. The creep noise analysis method for the vehicle braking system can comprehensively consider the influence of the braking working condition, the environmental humidity and the friction pair state of the braking system on the braking creep noise, so that the overall creep noise level of the braking system is comprehensively analyzed, the test is more comprehensive compared with the prior art, and the overall creep noise level of the braking system is more reasonably analyzed.
Description
Technical Field
The application relates to the technical field of vehicle braking, in particular to a method for analyzing creep noise for a vehicle braking system, and a method and a device for testing the creep noise for the vehicle braking system.
Background
The brake creep noise generated when the vehicle is braked is an important index for evaluating the NVH performance of the brake system of the passenger car, and is noise which is often related to the NVH performance of the brake when a customer uses the vehicle. Therefore, the brake system scheme needs to be subjected to model selection work in the early stage of vehicle development, the NVH performance of braking of each scheme is evaluated, and a proper scheme is selected, wherein the brake creep noise is an important evaluation index. The generation of the brake creep noise has transient and random properties, the strength of the brake creep noise is closely related to factors such as brake working conditions, environment and the like, the traditional test on the brake creep noise of the vehicle is carried out on a flat road in a dry state of a brake, a user has various vehicle using environments in life, such as high-humidity working conditions, urban congestion working conditions, slope working conditions and the like, the evaluation result obtained by the traditional method has great limitation, and in the prior art, no patent considers the specific conditions of the brake system under various working conditions and provides an objective evaluation for the brake system.
Accordingly, a solution is desired to solve or at least mitigate the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The object of the present invention is to provide a method for analyzing creep noise for a vehicle brake system to solve at least one of the above-mentioned problems.
In one aspect of the present invention, there is provided a creep noise analysis method for a vehicle brake system, the creep noise analysis method for a vehicle brake system including:
acquiring creep noise test data of a brake system to be tested, which is mounted on a vehicle, in each brake state, wherein the brake states comprise a normal-temperature brake state, a water spraying brake state and a water spraying overnight brake state;
acquiring a weight coefficient of each brake state;
and acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data and the weight coefficient under each brake state.
Optionally, each said brake state comprises a plurality of brake conditions.
Optionally, the following formula is adopted to obtain the creep noise level of the brake system to be tested:
f is the composite score, x ij To correspond to the creep noise value of the brake condition, a i As a weight coefficient corresponding to the state of the brake, b j The weight coefficient is corresponding to the working condition.
The present application further provides a vehicle is peristaltic noise analysis device for braking system, the vehicle is peristaltic noise analysis device for braking system includes:
the system comprises a peristaltic noise test data acquisition module, a data processing module and a data processing module, wherein the peristaltic noise test data acquisition module is used for acquiring peristaltic noise test data of a brake system to be tested, which is arranged on a vehicle, in each brake state, and the brake states comprise a normal-temperature brake state, a watering brake state and a watering overnight brake state;
the weight coefficient acquisition module is used for acquiring the weight coefficient of each brake state;
and the peristaltic noise level acquisition module is used for acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data in each brake state and the weight coefficient.
The application also provides a method for testing the creep noise of the vehicle braking system, which comprises the following steps:
installing a brake system to be tested on a vehicle for testing;
mounting a detection device on a vehicle for testing;
designing various brake states, and designing various brake working conditions under each brake state;
testing under different brake working conditions so as to acquire creep noise test data under each brake state;
the creep noise analysis method for the vehicle brake system is adopted, so that the creep noise level of the brake system to be tested is obtained.
Optionally, the mounting the detection device on a vehicle for testing includes:
arranging a sound sensor at a position close to the outer ear of a driver when the driver sits in the vehicle and/or a position close to the outer ear of a passenger when the passenger sits in the vehicle;
providing a vibration sensor at a vehicle brake caliper;
connecting the data acquisition equipment with a vehicle CAN signal through a CAN line so as to acquire a vehicle speed signal;
and respectively connecting the sound sensor and the vibration sensor with the data acquisition equipment.
Optionally, the brake state comprises:
a normal temperature brake state, a watering brake state and a watering overnight brake state;
the braking working conditions under the normal temperature brake state comprise:
the method comprises the following steps of (1) testing the D-grade creep noise of a flat road in a normal-temperature brake state, testing the R-grade creep noise of a flat road in a normal-temperature brake state, testing the D-grade scram creep noise of a flat road in a normal-temperature brake state, testing the starting creep noise of the D-grade scram of a flat road in a normal-temperature brake state, testing the R-grade scram creep noise of a flat road in a normal-temperature brake state, testing the starting creep noise of the R-grade scram of a flat road in a normal-temperature brake state, testing the D-grade creep noise of a slope road in a normal-temperature brake state, and testing the R-grade creep noise of a slope road in a normal-temperature brake state;
the braking condition under the state of the water spraying brake comprises the following steps:
d-grade creep noise test working condition of a sprinkling brake state level road, R-grade creep noise test working condition of the sprinkling brake state level road, D-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after D-grade sudden stop of the sprinkling brake state level road, R-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after R-grade sudden stop of the sprinkling brake state level road, D-grade creep noise test working condition of a sprinkling brake state slope road, and R-grade creep noise test working condition of the sprinkling brake state slope road;
the braking condition under watering night brake state includes:
the method comprises the following steps of testing the D-grade creep noise of a level road in the state of a watering night brake, testing the R-grade creep noise of the level road in the state of the watering night brake, testing the D-grade sudden stop creep noise of the level road in the state of the watering night brake, testing the starting creep noise of the D-grade sudden stop of the level road in the state of the watering night brake, testing the R-grade sudden stop creep noise of the level road in the state of the watering night brake, testing the starting creep noise of the R-grade sudden stop of the level road in the state of the watering night brake, testing the D-grade creep noise of the slope road in the state of the watering night brake, and testing the R-grade creep noise of the slope road in the state of the watering night brake.
Optionally, after the collecting the creep noise test data in each brake state and before obtaining the creep noise level of the brake system to be tested, the method for testing the creep noise of the vehicle brake system further includes:
and denoising the acquired peristaltic noise test data.
Optionally, the peristaltic noise test data comprises noise data;
the denoising processing of the acquired peristaltic noise test data comprises:
filtering the acquired noise data;
and performing total sound pressure level weighting calculation on the noise data subjected to filtering processing so as to obtain the noise level in the vehicle.
Optionally, the peristaltic noise test data further comprises vibration acceleration information;
after the acquisition of the creep noise test data in each brake state and before the acquisition of the creep noise level of the brake system to be tested, the method for testing the creep noise of the vehicle brake system further comprises the following steps:
and screening the noise data according to the vibration acceleration information so as to screen out the noise data which belongs to the noise data caused by braking.
Advantageous effects
The creep noise analysis method for the vehicle braking system can comprehensively consider the influence of the braking working condition, the environmental humidity and the friction pair state of the braking system on the braking creep noise, so that the overall creep noise level of the braking system is comprehensively analyzed, the test is more comprehensive compared with the prior art, and the overall creep noise level of the braking system is more reasonably analyzed.
Drawings
Fig. 1 is a schematic flow chart of a creep noise analysis method for a vehicle brake system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an electronic device capable of implementing the creep noise analysis method for a vehicle brake system according to an embodiment of the present application.
Fig. 3 is a schematic diagram of an acoustic sensor of an embodiment of the present application disposed on a vehicle.
Fig. 4 is a schematic top view of an acoustic sensor disposed in a seat according to an embodiment of the present application.
FIG. 5 is a side view of an acoustic sensor disposed on a seat according to an embodiment of the present application.
FIG. 6 is a schematic diagram of a peristaltic noise statistics table according to an embodiment of the present application.
FIG. 7 is another schematic diagram of a peristaltic noise statistics table according to an embodiment of the present application.
Reference numerals are as follows:
a sound sensor 1; a vehicle 2.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a creep noise analysis method for a vehicle brake system according to an embodiment of the present application.
The creep noise analysis method for a vehicle brake system shown in fig. 1 includes:
step 1: acquiring creep noise test data of a brake system to be tested, which is mounted on a vehicle, in each brake state, wherein the brake states comprise a normal-temperature brake state, a water spraying brake state and a water spraying overnight brake state;
step 2: acquiring a weight coefficient of each brake state;
and 3, step 3: and acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data under each brake state and the weight coefficient.
The creep noise analysis method for the vehicle braking system can comprehensively consider the influence of the braking working condition, the environmental humidity and the friction pair state of the braking system on the braking creep noise, so that the overall creep noise level of the braking system is comprehensively analyzed, the test is more comprehensive compared with the prior art, and the overall creep noise level of the braking system is more reasonably analyzed.
In the present embodiment, each brake state includes a plurality of brake conditions.
Specifically, the brake state includes:
a normal temperature brake state, a water spraying brake state and a water spraying overnight brake state;
the braking working conditions under the normal temperature brake state comprise:
d-grade creep noise test working condition of a flat road in a normal temperature brake state, R-grade creep noise test working condition of a flat road in a normal temperature brake state, D-grade sudden stop creep noise test working condition of a flat road in a normal temperature brake state, starting creep noise test working condition of D-grade sudden stop of a flat road in a normal temperature brake state, R-grade sudden stop creep noise test working condition of a flat road in a normal temperature brake state, starting creep noise test working condition of R-grade sudden stop of a flat road in a normal temperature brake state, D-grade creep noise test working condition of a slope road in a normal temperature brake state and R-grade creep noise test working condition of a slope road in a normal temperature brake state;
the braking condition under the state of the water spraying brake comprises the following steps:
d-grade creep noise test working condition of a sprinkling brake state level road, R-grade creep noise test working condition of the sprinkling brake state level road, D-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after D-grade sudden stop of the sprinkling brake state level road, R-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after R-grade sudden stop of the sprinkling brake state level road, D-grade creep noise test working condition of a sprinkling brake state slope road, and R-grade creep noise test working condition of the sprinkling brake state slope road;
the braking condition under watering night brake state includes:
the method comprises the following steps of D-grade creep noise testing working condition of a watering overnight brake state, R-grade creep noise testing working condition of the watering overnight brake state, D-grade sudden stop creep noise testing working condition of the watering overnight brake state, starting creep noise testing working condition after D-grade sudden stop of the watering overnight brake state, R-grade sudden stop creep noise testing working condition of the watering overnight brake state, starting creep noise testing working condition after R-grade sudden stop of the watering overnight brake state, D-grade creep noise testing working condition of a slope road of the watering overnight brake state and R-grade creep noise testing working condition of the watering overnight brake state.
The specific requirements for each of the operating conditions are described in detail below:
a) And D, testing the creep noise of the level road.
The method comprises the steps of placing a vehicle on a straight dry asphalt pavement, placing the gear of the vehicle in an N gear to keep the vehicle in a static state, then stepping a brake pedal to the bottommost part, placing the gear in a D gear, then slowly releasing the brake pedal until the brake pedal is completely released, changing the vehicle from the static state to a motion state, and simultaneously collecting the creep noise in the vehicle and the data of an acceleration sensor on a caliper in the process.
b) And testing creep noise of the level R gear.
The method comprises the steps of placing a vehicle on a straight dry asphalt pavement, placing the gear of the vehicle in an N gear to keep the vehicle in a static state, then stepping a brake pedal to the bottommost part, placing the gear in an R gear, then slowly releasing the brake pedal until the brake pedal is completely released, changing the vehicle from the static state to a motion state, and simultaneously collecting the creep noise in the vehicle and the data of an acceleration sensor on a caliper in the process.
c) And D, testing the D-gear scram and creep noise of the flat road.
The method comprises the steps of placing a vehicle on a flat and dry asphalt road surface, stepping a brake pedal to the bottommost part to enable the vehicle to be in a static state, placing a gear at a D gear, then loosening the brake pedal to enable the vehicle to be in a motion state from the static state, when the speed of the vehicle is increased to 5km/h, stepping the brake pedal quickly to enable the vehicle to be braked to stop at a deceleration of 0.2g, and meanwhile collecting creep noise in the vehicle and data of an acceleration sensor on a caliper in the braking process.
d) And (5) testing starting creep noise after the D-gear scram on the flat road.
After the action of 'D-gear scram creep noise test on a flat road' under the previous working condition is finished, the brake pedal is slowly released until the brake pedal is completely released, the vehicle is changed from a static state to a moving state again, and meanwhile creep noise in the vehicle and data of an acceleration sensor on a caliper in the process are collected.
e) And testing the road leveling R gear sudden stop creep noise.
The vehicle is placed on a flat and dry asphalt pavement, a brake pedal is stepped to the bottommost part to enable the vehicle to be in a static state, a gear is placed at a gear R, then the brake pedal is released to enable the vehicle to be in a moving state from the static state, when the speed of the vehicle is increased to 5km/h, the brake pedal is stepped rapidly, the vehicle is braked to be stopped at the deceleration of 0.2g, and meanwhile creep noise in the vehicle and data of an acceleration sensor on a caliper in the braking process are obtained.
f) And (5) testing starting creep noise after the flat road R gear is suddenly stopped.
After the action of 'road leveling R gear sudden stop creep noise test' under the previous working condition is finished, the brake pedal is slowly released until the brake pedal is completely released, the vehicle is changed from a static state to a moving state again, and meanwhile, the creep noise in the vehicle and the data of an acceleration sensor on the calipers in the process are collected.
g) And D, testing the creeping noise of the grade D of the slope.
The method comprises the steps of placing a vehicle on a dry asphalt ramp road surface with the gradient of 10 degrees, enabling the vehicle to move forwards in the downhill direction, placing the gear of the vehicle in the D gear, loosening a brake pedal to enable the vehicle to move forwards, then stepping on the brake pedal as slowly as possible to enable the vehicle to stop, then slowly loosening the brake pedal until the brake pedal is completely loosened, changing the vehicle from a static state to a moving state, and meanwhile collecting creep noise data in the vehicle in the process.
h) And testing the creeping noise of the R gear of the slope.
The method comprises the steps of placing a vehicle on a dry asphalt ramp road surface with a gradient of 10 degrees, enabling the vehicle to move in an uphill direction, placing the vehicle gear at an R gear, loosening a brake pedal to enable the vehicle to move backwards, then stepping on the brake pedal as slowly as possible to enable the vehicle to stop, then slowly loosening the brake pedal until the brake pedal is completely loosened, changing the vehicle from a static state to a moving state, and simultaneously collecting creep noise in the vehicle and data of an acceleration sensor on a caliper in the process.
In this embodiment, the states of the sprinkler brake are specifically as follows:
the method comprises the steps of placing a vehicle to be tested outdoors, spraying water to braking systems on the front side and the rear side of the vehicle by using tools such as a water gun and the like to enable the braking systems of the vehicle to be fully soaked by the water, and standing the vehicle for 15 minutes to serve as a water spraying brake.
In this embodiment, the brake water spraying overnight status is as follows:
placing the vehicle to be tested outdoors, spraying water to the front and rear braking systems of the vehicle by using tools such as a water gun and the like to fully soak the braking systems of the vehicle, standing the vehicle to be tested in the outdoor environment overnight, and testing the vehicle in the next morning to obtain the overnight watering state of the brake.
In this embodiment, the following formula is used to obtain the creep noise level of the brake system to be tested:
f is the composite score, x ij For creep noise values corresponding to braking conditions, a i Weight coefficient corresponding to the state of the brake, b j The weight coefficient is corresponding to the working condition.
The application also provides a method for testing the creep noise of the vehicle braking system, which comprises the following steps:
installing a brake system to be tested on a vehicle for testing;
mounting a detection device on a vehicle for testing;
designing various brake states, and designing various brake working conditions under each brake state;
testing under different brake working conditions so as to acquire creep noise test data under each brake state;
the creep noise analysis method for the vehicle brake system is adopted, so that the creep noise level of the brake system to be tested is obtained.
According to the creep noise testing method for the vehicle braking system, the creep noise level of the braking system can be comprehensively evaluated by designing different brake states and working conditions of each brake state.
In the present embodiment, mounting the detection device on a vehicle for testing includes:
arranging a sound sensor at a position close to the outer ear of a driver when the driver sits in the vehicle and/or a position close to the outer ear of a passenger when the passenger sits in the vehicle;
disposing a vibration sensor at a vehicle brake caliper;
the data acquisition equipment is connected with a vehicle CAN signal through a CAN line so as to acquire a vehicle speed signal;
and respectively connecting the sound sensor and the vibration sensor with the data acquisition equipment.
In this embodiment, the brake state includes:
a normal temperature brake state, a watering brake state and a watering overnight brake state;
specifically, the brake state includes:
a normal temperature brake state, a water spraying brake state and a water spraying overnight brake state;
the braking working conditions under the normal temperature brake state comprise:
the method comprises the following steps of (1) testing the D-grade creep noise of a flat road in a normal-temperature brake state, testing the R-grade creep noise of a flat road in a normal-temperature brake state, testing the D-grade scram creep noise of a flat road in a normal-temperature brake state, testing the starting creep noise of the D-grade scram of a flat road in a normal-temperature brake state, testing the R-grade scram creep noise of a flat road in a normal-temperature brake state, testing the starting creep noise of the R-grade scram of a flat road in a normal-temperature brake state, testing the D-grade creep noise of a slope road in a normal-temperature brake state, and testing the R-grade creep noise of a slope road in a normal-temperature brake state;
the braking condition under the state of the watering brake comprises the following steps:
d-grade creep noise test working condition of a sprinkling brake state level road, R-grade creep noise test working condition of the sprinkling brake state level road, D-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after D-grade sudden stop of the sprinkling brake state level road, R-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after R-grade sudden stop of the sprinkling brake state level road, D-grade creep noise test working condition of a sprinkling brake state slope road, and R-grade creep noise test working condition of the sprinkling brake state slope road;
the braking condition under the watering night brake state includes:
the method comprises the following steps of testing the D-grade creep noise of a level road in the state of a watering night brake, testing the R-grade creep noise of the level road in the state of the watering night brake, testing the D-grade sudden stop creep noise of the level road in the state of the watering night brake, testing the starting creep noise of the D-grade sudden stop of the level road in the state of the watering night brake, testing the R-grade sudden stop creep noise of the level road in the state of the watering night brake, testing the starting creep noise of the R-grade sudden stop of the level road in the state of the watering night brake, testing the D-grade creep noise of the slope road in the state of the watering night brake, and testing the R-grade creep noise of the slope road in the state of the watering night brake.
In this embodiment, after collecting the creep noise test data in each brake state and before acquiring the creep noise level of the brake system to be tested, the method for testing the creep noise of the vehicle brake system further includes:
and denoising the acquired peristaltic noise test data.
In the present embodiment, the creep noise test data includes noise data;
the denoising processing of the acquired peristaltic noise test data comprises:
filtering the acquired noise data;
and performing total sound pressure level weighting calculation on the noise data subjected to filtering processing so as to obtain the noise level in the vehicle.
In this embodiment, the creep noise test data further includes vibration acceleration information;
after the acquisition of the creep noise test data in each brake state and before the acquisition of the creep noise level of the brake system to be tested, the method for testing the creep noise of the vehicle brake system further comprises the following steps:
and screening the noise data according to the vibration acceleration information so as to screen out the noise data which belongs to the noise data caused by braking.
The method for determining the in-vehicle peristaltic noise source by comparing the caliper vibration signal with the in-vehicle noise signal in the time domain solves the problem that whether the in-vehicle noise signal is generated by a target brake cannot be distinguished by the traditional test method;
the application provides a weighting scoring method for the peristaltic noise levels of all working conditions, which can visually represent the peristaltic noise levels of all brake system schemes so as to facilitate the subsequent comparative analysis of different schemes.
The present application is further described in detail below by way of examples, and it should be understood that the examples are not to be construed as limiting the present application in any way.
The creep noise testing method for the vehicle braking system comprises the following steps:
installing a brake system to be tested on a vehicle for testing; specifically, test pieces such as a friction plate to be tested, a brake disc and the like are reloaded on a vehicle for test testing, the state of the vehicle is checked after the reloading is finished, the test vehicle meets the requirement of road safe driving, then the test vehicle is subjected to running-in with the mileage of 200 kilometers, and the braking frequency in the running-in period is not less than 1000 times.
Mounting a detection device on a vehicle for testing; referring to fig. 3 to 5, specifically, the sound sensor 1 is disposed at the in-vehicle driver outer ear and the right rear passenger outer ear of the vehicle 2.
The three-way vibration sensor is arranged on the surfaces of four brake calipers of the vehicle, and the specific position does not need to be required, so that the three-way vibration sensor is convenient to arrange.
The CAN signal of the vehicle is connected to the data acquisition equipment through a CAN line to acquire a vehicle speed signal, and the vehicle speed signal is subjected to differential processing to obtain an acceleration signal of the whole vehicle.
And connecting the test sensor to the data acquisition equipment, setting a test channel, the sensitivity of the sensor, the sampling frequency and the like, and completing the installation and debugging work of the test equipment.
Designing various brake states, and designing various brake working conditions under each brake state, which is as follows:
1. and testing the creep noise of the brake at the normal temperature.
Standing the vehicle to be tested in an outdoor environment for one night, and testing the creep noise of the vehicle under the following 8 working conditions in the next morning, wherein the measurement is repeated for 5 times under each working condition.
a) And D, testing the creep noise of the level road.
The method comprises the steps of placing a vehicle on a straight dry asphalt pavement, placing the gear of the vehicle in an N gear to keep the vehicle in a static state, then stepping a brake pedal to the bottommost part, placing the gear in a D gear, then slowly releasing the brake pedal until the brake pedal is completely released, changing the vehicle from the static state to a motion state, and simultaneously collecting the creep noise in the vehicle and the data of an acceleration sensor on a caliper in the process.
b) And testing the creep noise of the level R gear.
The method comprises the steps of placing a vehicle on a straight dry asphalt pavement, placing the gear of the vehicle in an N gear to keep the vehicle in a static state, then stepping a brake pedal to the bottommost part, placing the gear in an R gear, then slowly releasing the brake pedal until the brake pedal is completely released, changing the vehicle from the static state to a motion state, and simultaneously collecting the creep noise in the vehicle and the data of an acceleration sensor on a caliper in the process.
c) And D, testing the D-gear scram and creep noise of the flat road.
The method comprises the steps of placing a vehicle on a flat and dry asphalt pavement, stepping a brake pedal to the bottommost part to enable the vehicle to be in a static state, placing a gear at a D gear, then loosening the brake pedal to enable the vehicle to be in a moving state from the static state, and when the speed of the vehicle is increased to 5km/h, quickly stepping the brake pedal to enable the vehicle to be braked to the vehicle stop at the deceleration of 0.2g, and meanwhile collecting the in-vehicle creeping noise and the data of an acceleration sensor on a caliper in the braking process.
d) And (5) testing starting creep noise after the D-gear scram on the flat road.
After the action of 'D-gear scram creep noise test on a flat road' under the previous working condition is finished, slowly releasing the brake pedal until the brake pedal is completely released, changing the vehicle from a static state to a moving state again, and simultaneously collecting the creep noise in the vehicle and the data of an acceleration sensor on the calipers in the process.
e) And testing the scram and creep noise of the R gear of the flat road.
The method comprises the steps of placing a vehicle on a flat and dry asphalt pavement, stepping a brake pedal to the bottommost part to enable the vehicle to be in a static state, placing a gear at an R gear, then loosening the brake pedal to enable the vehicle to be in a moving state from the static state, and when the speed of the vehicle is increased to 5km/h, quickly stepping the brake pedal to enable the vehicle to be braked to the stop of the vehicle at the deceleration of 0.2g, and meanwhile, braking the in-vehicle creep noise and the data of an acceleration sensor on a caliper in the process.
f) And (5) testing starting and creeping noise after the scram of the R gear of the flat road.
After the action of 'road leveling R gear sudden stop creep noise test' under the previous working condition is finished, the brake pedal is slowly released until the brake pedal is completely released, the vehicle is changed from a static state to a moving state again, and meanwhile, the creep noise in the vehicle and the data of an acceleration sensor on the calipers in the process are collected.
g) And D-gear creep noise test on the slope.
The method comprises the steps of placing a vehicle on a dry asphalt ramp road surface with the gradient of 10 degrees, enabling the vehicle to move forwards in the downhill direction, placing the gear of the vehicle in the D gear, loosening a brake pedal to enable the vehicle to move forwards, then stepping on the brake pedal as slowly as possible to enable the vehicle to stop, then slowly loosening the brake pedal until the brake pedal is completely loosened, changing the vehicle from a static state to a moving state, and meanwhile collecting creep noise data in the vehicle in the process.
h) And testing the creeping noise of the R gear of the slope.
The method comprises the steps of placing a vehicle on a dry asphalt ramp road surface with the gradient of 10 degrees, enabling the advancing direction of the vehicle to be the ascending direction, placing the gear of the vehicle at the gear R, loosening a brake pedal to enable the vehicle to move backwards, then stepping on the brake pedal as slowly as possible to enable the vehicle to stop, then slowly loosening the brake pedal until the brake pedal is completely loosened, changing the vehicle from a static state to a motion state, and meanwhile collecting creep noise in the vehicle and data of an acceleration sensor on a caliper in the process.
2. And testing the peristaltic noise of the sprinkling state of the brake.
Placing the vehicle to be tested outdoors, spraying water to the braking systems on the front side and the rear side of the vehicle by using tools such as a water gun and the like to fully soak the braking systems of the vehicle, standing the vehicle for 15 minutes, and finally performing braking creep noise tests under 8 groups of working conditions which are the same as those in the creep noise test under the normal temperature state of the brake in the previous section 1, wherein each working condition is repeatedly measured for 5 times.
3. Testing the creep noise of the brake in the state of watering overnight.
Placing a vehicle to be tested outdoors, spraying water to the front and rear braking systems of the vehicle by using tools such as a water gun and the like to fully soak the braking systems of the vehicle, standing the vehicle to be tested in an outdoor environment overnight, carrying out braking creep noise tests on the vehicle in 8 groups of working conditions which are the same as those in the creep noise test of the section 1 and the brake at a normal temperature in the next morning, and repeatedly measuring each working condition for 5 times.
After each trial, collected creep noise test data is acquired, the creep noise test data including noise data and vibration acceleration data, wherein,
the creep noise is a broadband noise, and in order to eliminate the influence of other unnecessary noise components such as an engine, exhaust and the like on the calculation result, band-pass filtering processing (100 Hz-1000 Hz) needs to be carried out on noise time domain data, then total sound pressure level weighting calculation is carried out on the filtered time domain data, and the obtained calculation result is the noise level in the vehicle.
In addition to noise caused by braking, noise caused by other aspects can also be generated during the running process of the vehicle, and in order to identify whether the noise is caused by braking, screening is carried out in the following way:
the vibration signals transmitted by the vibration sensors on the calipers are compared with noise signals in the vehicle on the same time axis, and then peristaltic noise signals generated at target positions needing to be analyzed are selected. For example, when the creep noise appears in the vehicle, the vibration signal on the left front caliper also simultaneously has a peak value, and the noise is generated by the left front brake system.
After the processing of the steps, actually required data is obtained, the total sound pressure level of the noise in the vehicle obtained by processing each group of test working conditions is averaged, the level of the peristaltic noise of the working conditions can be obtained, and the level can be filled in a table shown in fig. 6.
In order to analyze the comprehensive creep noise level of a target brake system scheme, a weight coefficient is formulated for each brake state and each working condition according to the triggering frequency of each working condition of a user in the driving process, the total sound pressure level of the creep noise of each working condition is multiplied by the weight coefficient and then summed to obtain a comprehensive creep noise score of the brake system scheme, the comprehensive creep noise score represents the creep noise level of the brake system scheme, the creep noise level of each brake system scheme can be sorted according to the value, and the smaller the value is, the smaller the creep noise level is.
Referring to fig. 7, fig. 7 shows a specific application example of the method of the present application, and the composite score calculation method is formulated as:
f is the composite score (e.g., as can be seen in FIG. 7, the composite score for solution A is 54.273, solution B is 52.544, and solution C is 52.429. As can be seen from the composite score, solution C has the smallest score, i.e., the lower the level of creep noise, such that solution C has a higher priority than solution B than solution A in terms of priority), x ij To correspond to the creep noise value of the brake condition, a i Weight coefficient corresponding to the state of the brake, b j Is the weight coefficient of the corresponding working condition.
In the present embodiment, the weight coefficient a of the brake state i Weighting coefficient b with working conditions j The size of the automobile model (2) is set according to the service conditions of different automobile models, and the size of the automobile model (2) meets the following requirements:
brake state weight assignment: a is 1 (ambient temperature state) + a 2 (water spray state) + a 3 (overnight sprinkling state) =1
Distributing the working condition weight: b 1 (D grade on the way) + b 2 (Pinlu R grade) + b 3 (D grade of emergency stop on level road) + b 4 (starting after D-gear scram on level road) + b 5 (off road R gear scram) + b 6 (level road R gear)Starting after sudden stop) + b 7 (grade D of slope) + b 8 (grade R) =1.
Compared with the prior art, the application has the following advantages:
1. according to the actual use scene of a user, a creep noise test method of 24 seed working conditions in total of 3 brake states and 8 working conditions is formulated, and the creep noise level of a brake system can be comprehensively evaluated;
2. the method for determining the in-vehicle peristaltic noise source by comparing the caliper vibration signal with the in-vehicle noise signal in the time domain is provided, and the problem that whether the in-vehicle noise signal is generated by a target brake cannot be distinguished by the traditional test method is solved;
3. the weighting scoring method for the creep noise level of each working condition is provided, and the creep noise level of each brake system scheme can be visually represented so as to facilitate the subsequent comparative analysis of different schemes.
The application also provides a peristaltic noise analysis device for the vehicle braking system, which comprises a peristaltic noise test data acquisition module, a weight coefficient acquisition module and a peristaltic noise level acquisition module, wherein the peristaltic noise test data acquisition module is used for acquiring peristaltic noise test data of the to-be-tested braking system installed on the vehicle under each brake state, and the brake states comprise a normal-temperature brake state, a watering brake state and a watering overnight brake state; the weight coefficient acquisition module is used for acquiring the weight coefficient of each brake state; and the peristaltic noise level acquisition module is used for acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data in each brake state and the weight coefficient.
It will be appreciated that the above description of the method applies equally to the description of the apparatus.
The present application further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the method for analyzing the creep noise for the vehicle brake system as above is implemented.
The present application also provides a computer-readable storage medium storing a computer program which, when executed by a processor, is capable of implementing the above method for analyzing creep noise for a vehicle brake system.
Fig. 2 is an exemplary block diagram of an electronic device capable of implementing a creep noise analysis method for a vehicle brake system provided according to an embodiment of the present application.
As shown in fig. 2, the electronic device includes an input device 501, an input interface 502, a central processor 503, a memory 504, an output interface 505, and an output device 506. The input interface 502, the central processing unit 503, the memory 504 and the output interface 505 are connected to each other through a bus 507, and the input device 501 and the output device 506 are connected to the bus 507 through the input interface 502 and the output interface 505, respectively, and further connected to other components of the electronic device. Specifically, the input device 504 receives input information from the outside and transmits the input information to the central processor 503 through the input interface 502; the central processor 503 processes the input information based on computer-executable instructions stored in the memory 504 to generate output information, temporarily or permanently stores the output information in the memory 504, and then transmits the output information to the output device 506 through the output interface 505; the output device 506 outputs the output information to the outside of the electronic device for use by the user.
That is, the electronic device shown in fig. 2 may also be implemented to include: a memory storing computer-executable instructions; and one or more processors that when executing computer executable instructions may implement the creep noise analysis method for a vehicle braking system described in conjunction with fig. 1.
In one embodiment, the electronic device shown in FIG. 2 may be implemented to include: a memory 504 configured to store executable program code; one or more processors 503 configured to execute the executable program code stored in the memory 504 to perform the creep noise analysis method for the vehicle brake system in the above-described embodiments.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media include both non-transitory and non-transitory, removable and non-removable media that implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Furthermore, it will be obvious that the term "comprising" does not exclude other elements or steps. A plurality of units, modules or devices recited in the device claims may also be implemented by one unit or overall device by software or hardware.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks identified in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The Processor in this embodiment may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the apparatus/terminal device by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
In this embodiment, the module/unit integrated with the apparatus/terminal device may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is appropriately increased or decreased as required by legislation and patent practice in the jurisdiction. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application, and those skilled in the art can make variations and modifications without departing from the spirit and scope of the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Furthermore, it will be obvious that the term "comprising" does not exclude other elements or steps. A plurality of units, modules or devices recited in the device claims may also be implemented by one unit or overall device by software or hardware.
Although the invention has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A creep noise analysis method for a vehicle brake system, the creep noise analysis method comprising:
acquiring creep noise test data of a brake system to be tested, which is arranged on a vehicle, in each brake state, wherein the brake states comprise a normal-temperature brake state, a watering brake state and a watering overnight brake state;
acquiring a weight coefficient of each brake state;
and acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data and the weight coefficient under each brake state.
2. The method of analyzing creep noise for a vehicle braking system according to claim 1, wherein each of the brake states includes a plurality of brake conditions.
3. The method of analyzing creep noise for a vehicle brake system according to claim 2, wherein the creep noise level of the brake system to be tested is obtained using the following formula:
f is the composite score, x ij For creep noise values corresponding to braking conditions, a i As a weight coefficient corresponding to the state of the brake, b j Is the weight coefficient of the corresponding working condition.
4. A creep noise analyzing apparatus for a vehicle brake system, comprising:
the system comprises a peristaltic noise test data acquisition module, a data processing module and a data processing module, wherein the peristaltic noise test data acquisition module is used for acquiring peristaltic noise test data of a brake system to be tested, which is arranged on a vehicle, in each brake state, and the brake states comprise a normal-temperature brake state, a watering brake state and a watering overnight brake state;
the weight coefficient acquisition module is used for acquiring the weight coefficient of each brake state;
and the peristaltic noise level acquisition module is used for acquiring the peristaltic noise level of the brake system to be tested according to the peristaltic noise test data in each brake state and the weight coefficient.
5. A creep noise test method for a vehicle brake system, the creep noise test method comprising:
installing a brake system to be tested on a vehicle for testing;
mounting a detection device on a vehicle for testing;
designing various brake states, and designing various brake working conditions under each brake state;
testing under different brake working conditions so as to acquire peristaltic noise test data under each brake state;
the creep noise analyzing method for the vehicle brake system according to any one of claims 1 to 3 is adopted, thereby obtaining the creep noise level of the brake system to be tested.
6. The creep noise test method for a vehicle brake system according to claim 5, wherein the mounting the detecting means on the vehicle for test includes:
arranging a sound sensor at a position close to the outer ear of a driver when the driver sits in the vehicle and/or a position close to the outer ear of a passenger when the passenger sits in the vehicle;
disposing a vibration sensor at a vehicle brake caliper;
the data acquisition equipment is connected with a vehicle CAN signal through a CAN line so as to acquire a vehicle speed signal;
and respectively connecting a sound sensor and a vibration sensor with the data acquisition equipment.
7. The creep noise test method for a vehicle brake system according to claim 6, wherein the brake state includes:
a normal temperature brake state, a watering brake state and a watering overnight brake state;
the braking working condition under the normal temperature brake state comprises the following steps:
d-grade creep noise test working condition of a flat road in a normal temperature brake state, R-grade creep noise test working condition of a flat road in a normal temperature brake state, D-grade sudden stop creep noise test working condition of a flat road in a normal temperature brake state, starting creep noise test working condition of D-grade sudden stop of a flat road in a normal temperature brake state, R-grade sudden stop creep noise test working condition of a flat road in a normal temperature brake state, starting creep noise test working condition of R-grade sudden stop of a flat road in a normal temperature brake state, D-grade creep noise test working condition of a slope road in a normal temperature brake state and R-grade creep noise test working condition of a slope road in a normal temperature brake state;
the braking condition under the watering brake state includes:
d-grade creep noise test working condition of a sprinkling brake state level road, R-grade creep noise test working condition of the sprinkling brake state level road, D-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after D-grade sudden stop of the sprinkling brake state level road, R-grade sudden stop creep noise test working condition of the sprinkling brake state level road, starting creep noise test working condition after R-grade sudden stop of the sprinkling brake state level road, D-grade creep noise test working condition of a sprinkling brake state slope road, and R-grade creep noise test working condition of the sprinkling brake state slope road;
the braking condition under watering night brake state includes:
the method comprises the following steps of D-grade creep noise testing working condition of a watering overnight brake state, R-grade creep noise testing working condition of the watering overnight brake state, D-grade sudden stop creep noise testing working condition of the watering overnight brake state, starting creep noise testing working condition after D-grade sudden stop of the watering overnight brake state, R-grade sudden stop creep noise testing working condition of the watering overnight brake state, starting creep noise testing working condition after R-grade sudden stop of the watering overnight brake state, D-grade creep noise testing working condition of a slope road of the watering overnight brake state and R-grade creep noise testing working condition of the watering overnight brake state.
8. The method for testing the creep noise of a vehicle brake system according to claim 7, wherein after the collecting the test data of the creep noise in each brake state and before the obtaining the level of the creep noise of the brake system to be tested, the method for testing the creep noise of a vehicle brake system further comprises:
and denoising the acquired peristaltic noise test data.
9. The creep noise test method for a vehicle brake system according to claim 8, wherein the creep noise test data includes noise data;
the denoising processing of the acquired peristaltic noise test data comprises:
filtering the acquired noise data;
and performing total sound pressure level weighting calculation on the noise data subjected to filtering processing so as to obtain the noise level in the vehicle.
10. The creep noise test method for a vehicle brake system according to claim 9, wherein the creep noise test data further includes vibration acceleration information;
after the acquisition of the creep noise test data in each brake state and before the acquisition of the creep noise level of the brake system to be tested, the method for testing the creep noise of the vehicle brake system further comprises the following steps:
and screening the noise data according to the vibration acceleration information so as to screen out the noise data caused by braking in the noise data.
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| CN116007963A (en) * | 2023-03-24 | 2023-04-25 | 江西五十铃汽车有限公司 | Automobile brake noise evaluation method, system, storage medium and equipment |
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| CN116007963A (en) * | 2023-03-24 | 2023-04-25 | 江西五十铃汽车有限公司 | Automobile brake noise evaluation method, system, storage medium and equipment |
| CN116007963B (en) * | 2023-03-24 | 2023-08-22 | 江西五十铃汽车有限公司 | Automobile brake noise evaluation method, system, storage medium and equipment |
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