CN110763485A - Method and system for testing performance of automobile anti-heat fading braking system - Google Patents
Method and system for testing performance of automobile anti-heat fading braking system Download PDFInfo
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- CN110763485A CN110763485A CN201911072694.9A CN201911072694A CN110763485A CN 110763485 A CN110763485 A CN 110763485A CN 201911072694 A CN201911072694 A CN 201911072694A CN 110763485 A CN110763485 A CN 110763485A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the field of automobile performance test, and provides a method for testing the performance of an automobile anti-heat fade brake system, aiming at solving the problem of inconvenient operation caused by uniform deceleration braking by adopting manual braking in the conventional anti-heat fade brake test method, which comprises the following steps: an acceleration step: accelerating the automobile to a test speed; braking: carrying out emergency braking to enable the speed of the automobile to be 0 km/h; a measurement step: after the steps of accelerating and decelerating are repeated for a plurality of times in a circulating way, measuring the braking distance of the automobile and comparing the braking distance with the standard braking distance; wherein: in the braking step, full-force braking is carried out, so that the speed of the automobile is increased to 0km/h from the testing speed. The invention can simplify the operation of the test of the heat fading resistance; the invention also provides a system for testing the performance of the automobile anti-heat fading braking system.
Description
Technical Field
The invention relates to the field of automobile performance testing, in particular to a method and a system for testing the performance of an automobile anti-heat fading braking system.
Background
As more and more people choose to use automobiles as transportation vehicles or transportation means, the safety of automobiles is increasingly emphasized. Among them, the braking performance of the vehicle is one of the determinants for ensuring the safety performance of the vehicle running and improving the running dynamics. Traffic accidents caused by braking problems such as heat decline of brake performance, mismatching of brake performance of automobiles and trains and the like frequently occur, and life and property safety of the nation and people is seriously endangered. Ensuring that the vehicle maintains good braking performance is therefore an important task for both the manufacturer and the user of the vehicle design. The braking performance, the brake heat fading resistance and the directional stability of the automobile during braking are three important evaluation indexes of the braking performance of the automobile, wherein the heat fading refers to the phenomenon that if the automobile brake works for a long time or is continuously braked emergently, a friction system is reduced due to friction overheating, and the braking effect is influenced. In order to ensure good brake heat fading resistance of the automobile, a brake designer can test and verify after design so as to ensure the safety of the automobile.
At present, when the heat fading resistance performance of an automobile brake system is tested, an automobile is braked by certain uniform deceleration motion after running at a high speed, then the uniform deceleration braking is continuously carried out for multiple times, and then the braking distance of the automobile at the moment is measured. Because the brake of the automobile has the phenomenon of friction overheating due to continuous multiple times of emergency braking, if the braking distance in the situation is not large compared with the ordinary braking distance, and if the braking distance is within a certain range, the automobile has good heat fading resistance. However, in this process, the braking of the vehicle is achieved by manual braking, i.e. by the driver pressing the brake pedal. Thus, in order to brake the automobile at a uniform deceleration, the driver needs to grasp the pressure for stepping on the brake pedal during the braking process, if the pressure is too high, the deceleration is too high, and if the pressure is too low, the deceleration is too low, so the operation is very inconvenient; in this process, it takes a certain time to brake the vehicle from a high speed in a uniform deceleration motion, and thus, the test efficiency is also reduced.
Disclosure of Invention
The invention provides a method for testing the performance of an automobile anti-heat fading brake system, which aims to solve the problem of inconvenient operation caused by uniform deceleration braking by adopting manual braking in the conventional anti-heat fading brake testing method.
The invention provides a basic scheme that: a performance test method for an automobile anti-heat fading braking system comprises the following steps:
an acceleration step: accelerating the automobile to a test speed;
braking: carrying out emergency braking to enable the speed of the automobile to be 0 km/h;
a measurement step: after the steps of accelerating and decelerating are repeated for a plurality of times in a circulating way, measuring the braking distance of the automobile and comparing the braking distance with the standard braking distance;
wherein: in the braking step, full-force braking is carried out, so that the speed of the automobile is increased to 0km/h from the testing speed.
The basic scheme has the working principle and the beneficial effects that: compared with the existing heat fading resistance test mode, the scheme 1. in the braking step, a full-force braking mode is adopted for braking, namely, when a driver performs braking operation, the driver only needs to step on a brake pedal to the bottom, the stepping pressure does not need to be controlled, the operation is extremely simple, and the full-force braking mode is adopted, so that the automobile can be braked in the fastest time, the time for completing the test is further reduced, and the test efficiency is improved; 2. in the process of cyclic braking, the second acceleration and braking are carried out immediately after the first braking is finished, so that the time consumed between multiple times of braking is shortened, the test time consumption is further reduced, and the test efficiency is improved.
The first preferred scheme is as follows: as a first basic solution, the second acceleration step is preferably carried out immediately after the first braking step. Has the advantages that: in the braking process, the motion kinetic energy of the whole vehicle is converted into energy in other forms through friction between the friction material and the brake, wherein about 90% of the energy is converted into heat energy which is expressed as the temperature rise of the brake. With the rise of temperature, the surface film and the body surface layer of the friction material undergo complex physical and chemical changes, so that the friction coefficient is obviously changed. The friction coefficient of the friction material increases with increasing temperature in the lower temperature interval; however, as the temperature continues to rise, the friction material undergoes heat fading, and the coefficient of friction decreases as the temperature rises; and when the temperature is reduced to a low temperature range, the friction coefficient is gradually recovered. That is, after the temperature of the friction material is reduced, the heat fading of the braking performance is reduced, so in the scheme, the second acceleration step is performed immediately after the first braking is completed, and thus, the friction material is always in a continuous temperature rise state, and the accuracy of the measurement result of the heat fading resistance is ensured.
The preferred scheme II is as follows: preferably, before the accelerating step, the method further comprises a test environment adjusting step: and adjusting the environmental parameters of the test environment to ensure that the environmental parameters are kept within the standard parameter range. Has the advantages that: in the scheme, the environmental parameters of the test environment are adjusted, so that the influence of the test environment on the test is reduced, and the accuracy of the test result is ensured.
The preferable scheme is three: preferably, before the accelerating step, the method further comprises a checking step: and (5) checking the fastening condition of the steering mechanism and each part fastener of the automobile and the efficiency of the braking system, and performing an acceleration step after the checking is qualified. Has the advantages that: in consideration of the fact that the driver operates in the test process, in order to guarantee the safety of the driver, in the scheme, before the acceleration step, the special steering mechanism of the automobile, the fastening condition of the fastening piece and the efficiency of the braking system are checked, and only after the checking is qualified, namely, the times of the automobile are in a normal state, the acceleration step is carried out, so that the test safety is guaranteed.
The preferable scheme is four: preferably, before the accelerating step, the method further comprises an inflating step: and inflating the automobile tire to enable the tire pressure value to be in accordance with the factory specified value. Has the advantages that: considering that the inflation condition of the tire can also influence the braking of the automobile, the automobile tire is inflated before the acceleration step in the scheme, and the pressure value of the tire is ensured to be in accordance with the factory specified value, so that the influence of the tire on the braking is reduced, and the accuracy of the test result is ensured.
The preferable scheme is five: preferably, before the accelerating step, the method further comprises a loading step: the automobile is loaded so that the automobile is in a full load state. Has the advantages that: considering that the heavier the automobile is, the higher the requirement on the braking performance is, therefore, in the scheme, before the acceleration step is carried out, the automobile is in a full-load state through the loading step, so that the test result can meet the maximum requirement of the automobile on the braking performance, and the comprehensiveness of the test result is ensured.
The preferable scheme is six: preferably, in the fifth step, the weighted object is fixed in the vehicle. Has the advantages that: considering that the automobile is in the braking step or the accelerating step, if the counterweight moves, the acceleration or the braking of the automobile is easily influenced, so that in the scheme, the counterweight is fixed in the automobile, the movement of the counterweight is avoided, and the accuracy of a test result is ensured.
The preferable scheme is seven: preferably, in the checking step, it is further checked whether a test device for measuring a braking distance of the vehicle is securely installed in the vehicle. Has the advantages that: considering that the movement of the measuring equipment in the automobile can influence the measured automobile braking distance, the scheme also checks the fastening condition of the measuring equipment in the automobile, and ensures the accuracy of the braking distance measurement, thereby ensuring the accuracy of the test result.
The preferable scheme is eight: preferably, in the measuring step, the temperature of the brake friction plate is measured, and when the measured temperature is greater than a temperature threshold value, an alarm is given. Has the advantages that: considering that the situation that the brake friction plate is possibly burnt out after the temperature of the brake friction plate is raised to exceed a certain temperature, the temperature of the brake friction plate is measured in the scheme, the temperature of the brake friction plate is monitored, the situation that the brake friction plate is burnt out is avoided, and the normal process of the brake friction plate is ensured.
The invention also aims to provide a high-efficiency performance test system for the heat fading resistant brake system of the automobile, wherein: the device comprises a measuring module, a control module and a control module, wherein the measuring module is used for measuring the braking distance of the automobile after multiple times of acceleration and braking;
the storage module stores a standard braking distance and a standard parameter range;
the environment acquisition module is used for acquiring environment parameters and generating environment parameter information;
the comparison module is used for comparing the environmental parameter information with the standard parameter range;
and the environment adjusting module is used for adjusting the testing environment parameters when the environment parameter information is not in accordance with the standard parameter range.
Drawings
FIG. 1 is a flow chart of a testing method in an embodiment of a method and a system for testing the performance of an automobile anti-heat fading braking system.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
The embodiment is basically as shown in the attached figure 1: a performance test method for an automobile anti-heat fading braking system comprises the following steps:
adjusting the test environment: adjusting the environmental parameters of the test environment to ensure that the environmental parameters are kept within the standard parameter range;
and (3) checking: the fastening conditions of a steering mechanism and fasteners of each part of the automobile and the efficiency of a braking system are checked, and all checking indexes are qualified; checking whether a test device for measuring the braking distance of the automobile is tightly arranged in the automobile;
and (3) inflating: inflating the automobile tire and enabling the tire pressure value to accord with a factory specified value;
loading: loading the automobile to enable the automobile to be in a full-load state, and particularly fixing a counterweight in the automobile;
an acceleration step: accelerating the automobile to a test speed;
braking: carrying out emergency full-force braking to enable the speed of the automobile to be 0 km/h;
a measurement step: after the first braking step is finished, a second acceleration step is immediately carried out, namely the automobile is directly accelerated to the test speed after the speed of the automobile is 0km/h, and after the steps of acceleration-deceleration are repeated for many times in a circulating way, the braking distance of the automobile is measured and compared with the standard braking distance; and the temperature of the brake friction plate is also measured, and when the measured temperature is greater than the temperature threshold value, an alarm is given.
In order to realize the test method, the embodiment also discloses a performance test system of the automobile anti-heat fading brake system, which comprises a measurement module, a brake module and a control module, wherein the measurement module is used for measuring the brake distance of the automobile after multiple times of acceleration and braking;
the storage module stores a standard braking distance and a standard parameter range;
the environment acquisition module is used for acquiring environment parameters and generating environment parameter information;
the comparison module is used for comparing the environmental parameter information with the standard parameter range;
and the environment adjusting module is used for adjusting the testing environment parameters when the environment parameter information is not in accordance with the standard parameter range.
The specific implementation process is as follows: the environment acquisition module acquires the test environment parameters and generates environment parameter information, specifically, the environment parameters may be parameters of environment temperature and wind speed, in this embodiment, the environment temperature and the wind speed are acquired by the environment acquisition module, and the environment temperature parameter information C1 and the environment wind speed parameter information F1 are acquired and obtained by the environment acquisition module.
Setting the standard parameter range stored in the storage module as the ambient temperature of 0-40 ℃, and the wind speed of less than 5m/s2(ii) a If the comparison module compares that C1 is less than 0 or C1 is more than 40, or F1 is more than or equal to 5m/s2And the environment adjusting module is started at the moment, and the adjusting of the test environment parameters specifically comprises a temperature adjusting unit and a wind speed adjusting unit, wherein the temperature adjusting unit adjusts the environment temperature, and the wind speed adjusting unit adjusts the environment wind speed to ensure that the acquired environment parameter information conforms to the standard parameter range.
The test road pavement is ensured to be dry and flat concrete or other pavements with the same adhesion coefficient, the gradient of the longitudinal arbitrary 50m length is less than 1%, the road arch gradient is less than 2%, the pavement width is not less than 3.5m, and the pavement adhesion coefficient is more than or equal to 0.9.
Inflating the tire to the specified value of the manufacturer, wherein the error is not more than +/-10 kPa, and the pattern height of the tread is not less than 50% of the new pattern; the brake is run in according to the manufacturer's regulations and the brake is adjusted so that the brake is in a normal state.
An automobile performance test system is installed on a vehicle and can measure parameters including the driving speed, time, driving distance and the like of the automobile.
The test vehicle is loaded to ensure that the vehicle is fully loaded, including testing the driver, the test equipment, and the necessary counterweight sandbags. All the counter weights, which are sandbags in the embodiment, are fixed on the automobile, so that the movement in the test process is avoided;
the test was performed on a high adhesion coefficient road surface, the manual transmission should be tested separately with the clutch disengaged and engaged, and the automatic transmission placed in "D-range" for direct braking. And (5) performing full-force braking for 80 km/h-0 for the first time, and measuring the values of the braking distance, the MFDD, the maximum braking force and the like when the automobile is braked. And (4) directly carrying out second braking without stopping after the first braking is finished, wherein the initial speed is 80 +/-2 km/h in the testing process. Therefore, the full-force braking of 80 km/h-0 is continuously carried out for 10 times, and the heat fading performance of the automobile braking system is simulated under the continuous steep slope braking working condition.
Example two
The difference with the first embodiment lies in that the scheme further comprises an acquisition module for acquiring displacement information and received pressure information of a counterweight sandbag on the vehicle in the braking process.
When a test vehicle is loaded, the sandbag is fixed on an automobile seat by using a safety belt, the acquisition module comprises a displacement acquisition unit and a pressure acquisition unit, the displacement acquisition unit is installed on a seat backrest, the pressure acquisition unit is installed on the safety belt, in an initial state, displacement information acquired by the position acquisition unit is 0, and at the moment, the pressure acquisition unit is subjected to zero adjustment processing, so that pressure information acquired by the pressure acquisition unit is 0; then start the car after and carry out the braking, displacement information and pressure information at this moment of gathering, displacement information and pressure information according to gathering adjust safety belt and air bag's setting, if the displacement information who gathers is great, then indicate when the braking process, the amount of exercise of sand bag is great, in order to avoid the front end of loading the car, just need increase the degree of inflating to air bag when setting up air bag, guarantee can fully play the cushioning effect, avoid the passenger on the seat can hit preceding door window.
The foregoing are merely exemplary embodiments of the present invention, and no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the art, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice with the teachings of the invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A performance test method for an automobile anti-heat fading braking system comprises the following steps:
an acceleration step: accelerating the automobile to a test speed;
braking: carrying out emergency braking to enable the speed of the automobile to be 0 km/h;
a measurement step: after the steps of accelerating and decelerating are repeated for a plurality of times in a circulating way, measuring the braking distance of the automobile and comparing the braking distance with the standard braking distance;
the method is characterized in that: in the braking step, full-force braking is carried out, so that the speed of the automobile is increased to 0km/h from the testing speed.
2. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: the second acceleration step is performed immediately after the first braking step is completed.
3. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: the method also comprises a test environment adjusting step before the accelerating step: and adjusting the environmental parameters of the test environment to ensure that the environmental parameters are kept within the standard parameter range.
4. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: the method also comprises a checking step before the accelerating step: and (5) checking the fastening condition of the steering mechanism and each part fastener of the automobile and the efficiency of the braking system, and performing an acceleration step after the checking is qualified.
5. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: before the accelerating step, the method also comprises an inflating step: and inflating the automobile tire to enable the tire pressure value to be in accordance with the factory specified value.
6. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: before the accelerating step, the method also comprises a loading step: the automobile is loaded so that the automobile is in a full load state.
7. The method for testing the performance of the automobile anti-heat fading brake system according to claim 6, wherein the method comprises the following steps: in the loading step, the weighted object is fixed in the automobile.
8. The method for testing the performance of the automobile anti-heat fading brake system according to claim 4, wherein the method comprises the following steps: in the checking step, whether a testing device for measuring the braking distance of the automobile is tightly arranged in the automobile is checked.
9. The method for testing the performance of the automobile anti-heat fading brake system according to claim 1, characterized in that: and in the measuring step, the temperature of the brake friction plate is measured, and when the measured temperature is greater than a temperature threshold value, an alarm is given.
10. A performance test system for an automobile anti-heat fading brake system is characterized in that: the device comprises a measuring module, a control module and a control module, wherein the measuring module is used for measuring the braking distance of the automobile after multiple times of acceleration and braking;
the storage module stores a standard braking distance and a standard parameter range;
the environment acquisition module is used for acquiring environment parameters and generating environment parameter information;
the comparison module is used for comparing the environmental parameter information with the standard parameter range;
and the environment adjusting module is used for adjusting the testing environment parameters when the environment parameter information is not in accordance with the standard parameter range.
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| CN112945576A (en) * | 2021-02-26 | 2021-06-11 | 中国汽车工程研究院股份有限公司 | Method for testing driving range and energy consumption of extended-range hydrogen fuel cell passenger vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20200207 |